Montebello Municipal Code Ch. 15.36 Seismic Safety Code

Subject to certain changes and amendments hereinafter set forth in this chapter, the city council does adopt as the seismic safety regulations for the city, the 2019 California Building Code (Title 24, California Code of Regulations), based on the 2018 International Building Code, and as thereafter amended and published from time to time, by the California Building Standards Commission (hereinafter referred to as the "code"). The code provides minimum standards to safeguard life or limb, health, property and public welfare by regulating and controlling the hazardous to life and property from seismic activity is made a part as though fully set forth in this chapter. One copy of the code is on file in the office of the city clerk for public inspection, and the same is made a part hereof as though fully set forth in this chapter.

(Prior code § 8250)

(Ord. No. 2336, § 43, 3-10-2010; Ord. No. 2347, § 9, 12-14-2011; Ord. No. 2356, § 19, 2-26-2014; Ord. No. 2392, § 30, 1-25-2017; Ord. No. 2421, § 42, 5-13-2020; Ord. No. 2424, § 42, 5-27-2020)

The building division is designated and authorized to enforce the regulations of this chapter. The code enforcement division is authorized to enforce the regulations of this chapter, subject to the approval of the building division.

(Ord. No. 2336, § 44, 3-10-2010)

A. The provisions of this chapter prescribe general design requirements applicable to all structures regulated by this code. The provisions of California Building Code Chapter 16, as added by this chapter, apply to all buildings constructed or under construction prior to October 6, 1933, or for which a building permit was issued prior to October 6, 1933, or for which a building permit was issued prior to October 6, 1933, which on January 1, 1986, have unreinforced masonry bearing walls as defined herein.

B. Exception. The provisions of California Building Code Chapter 16, as added by this chapter, shall not apply to detached one or two family dwellings and detached apartment houses containing fewer than five dwelling units and used solely for residential purposes.

(Prior code § 8252)

(Ord. No. 2336, § 45, 3-10-2010; Ord. No. 2356, § 20, 2-26-2014)

A. The purpose of this chapter is to promote public safety and welfare by reducing the risk of death or injury that may result from the effects of earthquakes on unreinforced masonry bearing wall buildings constructed before 1934. Such buildings have been widely recognized for their sustaining of life hazardous damage as a result of partial or complete collapse during past moderate to strong earthquakes.

B. The provisions of the ordinance codified in this chapter establish minimum standards for structural seismic resistance for the purpose of reducing risk of life loss or injury and will not necessarily prevent loss of life or injury or prevent earthquake damage to an existing building which complies with these standards. This chapter does not require existing electrical, plumbing, mechanical or fire safety systems to be altered unless they constitute a hazard to life or property.

C. This chapter provides systematic procedures and standards for identification and classification of unreinforced masonry bearing wall buildings based on their present use. Priorities, time periods and standards are also established under which these buildings are required to be structurally analyzed and anchored. Where the analysis determines deficiencies, this chapter requires the building be strengthened or demolished.

(Prior code § 8251)

ESSENTIAL BUILDING is any building housing a hospital or other medical facility having surgery or emergency treatment areas, fire or police stations, municipal government disaster operation and communications centers. Essential Building is also outlined as Risk Category IV Occupancy of 2019 California Building Code.

HIGH-RISK BUILDING is any building not classified an essential building having an occupant load of one hundred (100) occupants or more or representing a substantial hazard to human life in the event of failure including but not limited to Risk Category III Occupancy of 2019 California Building Code.

EXCEPTION: A high-risk building shall not include the following:

(a) Any building having exterior walls braced with masonry cross walls or wood-frame cross walls spaced less than forty (40) feet apart in each story. Cross walls shall be full story height with a minimum length of one and one-half (1½) times the story height.

(b) Any building used for its intended purpose, as determined by the Building Official for less than twenty (20) hours per week.

HISTORICAL BUILDING is any building designated as a historical building by an appropriate federal, state or city jurisdiction.

LOW-RISK BUILDING is any building not classified as an essential building having an occupant load of less than twenty (20) occupants. It is defined as Risk Category I Occupancy in the 2019 California Building Code.

MEDIUM-RISK BUILDING is any building not classified as a high-risk building or an essential building having an occupant load of twenty (20) occupants or more. It is also defined as the Risk Category II Occupancy in the 2019 California Building Code.

UNREINFORCED MASONRY BEARING WALL is masonry wall having all of the following characteristics:

(1) Provides the vertical support for a floor or roof.

(2) The total superimposed load is over one hundred (100) pounds per linear foot.

(3) The area of reinforcing steel is less than fifty (50) percent of that required.

(Prior code § 8253)

(Ord. No. 2356, § 21, 2-26-2014; Ord. No. 2421, § 13, 5-13-2020; Ord. No. 2424, § 13, 5-27-2020)

Editor's note— Ord. No. 2421, § 13, adopted May 13, 2020, changed the title of § 15.36.040 from "CBC Section 1613.2 amended—Definitions" to read as herein set out.

Rating Classifications. Each building within the scope of this Chapter shall be placed in one of the Risk Category Occupancy established in Table 23-M and/or 2019 CBC Table 1604.5 by the Building Official. The most current CBC Earthquake Load shall be applied based on the risk category classification per the total occupant load of the entire building.

EXCEPTION: For the purpose of this Chapter, portions of buildings constructed to act independently when resisting seismic forces may be placed in separate rating classifications.

(Prior code § 8254)

(Ord. No. 2356, § 22, 2-26-2014; Ord. No. 2392, § 31, 1-25-2017; Ord. No. 2421, § 14, 5-13-2020; Ord. No. 2424, § 14, 5-27-2020)

Editor's note— Ord. No. 2421, § 14, adopted May 13, 2020, changed the title of § 15.36.050 from "CBC Section 1613.7 added—Rating classifications" to read as herein set out.

The owner of each building within the scope of this section shall cause a structural analysis to be made of the building by a civil or structural engineer or architect licensed by the State of California, and if the building does not meet the minimum earthquake standards specified in this section, the owner shall cause it to be structurally altered to conform to such standards or cause the building to be demolished.

The owner of a building within the scope of this section shall comply with the requirements set forth above by submitting one of the following to the Building Official for review within the stated time limits:

(a) A structural analysis within ninety (90) days after the service of the order. Such analysis, which is subject to approval by the Building Official, shall demonstrate that the building meets the minimum requirements of this section.

(b) A structural analysis and plans for the proposed structural alterations of the building necessary to comply to the minimum alterations of this section within ninety (90) days after the service of order.

(c) Plans for the demolition or repair of the building within ninety (90) days after the service of the order. After plans are submitted and approved by the Building Official, the owner shall obtain a building permit, commence and complete the required construction or demolition within the time limits set forth in Table No. 23-N. These time limits shall begin to run from the date the order is served in accordance with the 2019 CBC requirements.

(Prior code § 8255)

(Ord. No. 2356, § 23, 2-26-2014; Ord. No. 2421, § 15, 5-13-2020; Ord. No. 2424, § 15, 5-27-2020)

Editor's note— Ord. No. 2421, § 15, adopted May 13, 2020, changed the title of § 15.36.060 from "CBC Section 1613.2.1 added—General requirements" to read as herein set out.

(a) COMMENCEMENT OF PROCEEDINGS. Whenever the Building Official has inspected or caused to be inspected any building and has found and determined that such building is within the scope of this Chapter, the Building Official shall commence proceedings to cause such building to be repaired and rehabilitated, or demolished, in compliance with the provisions of this Chapter.

(b) CONTENTS OF NOTICE AND ORDER. The Building Official shall issue a notice and order directed to the record owner of the building and the person, if any, occupying or otherwise in real or apparent charge and control of the building. The notice and order shall contain:

(1) The street address and a legal description sufficient for identification of the premises on which the building is located.

(2) A statement that the Building Official has found the building to be within the scope of this Chapter.

(3) An order to prepare and submit to the Building Official a structural analysis as required pursuant to the CBC Earthquake Loads requirements.

(4) The Risk Category Occupancy classification of the building.

(5) An order to secure permits, physically commence, and to complete all work necessary to meet the minimum seismic standards of this Chapter within the time limits set forth in Table No. 23-N.

(6) A statement specifying the appeal rights of the owner as contained in subsection (d) of this section.

(c) SERVICE AND RECORDATION OF NOTICE AND ORDER. The notice and order shall be served and recorded.

(d) APPEAL FROM NOTICE AND ORDER. Any person entitled to service pursuant to this section may appeal the Building Official's initial determination that the building is within the scope of this Chapter to the City Council. Such appeal shall be filed with the City Council within sixty (60) days from the service date of the order and shall be limited solely to the issue of whether the designated building is within the scope of this Chapter. Such appeal shall be made in writing upon appropriate forms provided therefor by the Building Official, and the grounds thereof shall be stated clearly and concisely.

(e) ENFORCEMENT. If the owner or other person in charge or control of the subject building fails to comply with any order issued by the Building Official pursuant to this Chapter within any of the time limits set forth in the 2019 CBC, the Building Official shall order that the entire building be vacated and that the building remain vacated until such order has been complied with. If compliance with such order has not been accomplished within ninety (90) days after the date the building has been ordered vacated or such additional time as may have been granted by the City Council, the Building Official may order the demolition of the building in accordance with the provisions of the California Building Code.

(Prior code § 8256)

(Ord. No. 2356, § 24, 2-26-2014; Ord. No. 2421, § 16, 5-13-2020; Ord. No. 2424, § 16, 5-27-2020)

Editor's note— Ord. No. 2421, § 16, adopted May 13, 2020, changed the title of § 15.36.070 from "CBC Section 1613.2.2 added—Administration" to read as herein set out.

(a) GENERAL. The standards and procedures established by this section shall apply in all aspects to a historical building except that as a means to preserve original architectural elements and facilities restoration, a historical building may, in addition, comply with the special provisions set forth in this section.

(b) UNBURNED CLAY MASONRY OR ADOBE. Existing or re-erected walls of adobe construction shall conform to the following:

(1) Unreinforced adobe masonry walls shall not exceed a height or height-to-thickness ration of five (5) for exterior bearing walls and must be provided with a reinforced bond beam at the top, interconnecting all walls. Minimum beam depth shall be six (6) inches and a minimum width of eight (8) inches less than the wall width. Minimum wall thickness shall be eighteen (18) inches for exterior bearing walls and ten (10) inches for adobe partitions. No adobe structure shall exceed one (1) story in height unless the historic evidence indicates a two (2) story height. In such cases, the height-to-thickness ration shall be the same as above for the first floor based on the total two (2) story height, and the second floor wall thickness shall not exceed the ratio five (5) by more than twenty (20) percent. Bond beams shall be provided at the roof and second-floor levels.

(2) Foundation footings shall be reinforced concrete under newly reconstructed walls and shall be fifty (50) percent wider than the wall above, soil conditions permitting, except that the foundation wall may be four (4) inches less in width than the wall above if a rock, burned brick, or stabilized adobe facing is necessary to provide authenticity.

(3) New or existing unstabilized brick and adobe brick masonry shall have an average compressive strength of two hundred twenty-five (225) pounds per square inch when tested in accordance with ASTM designation C 67. One (1) sample out of five (5) may have a compressive strength of not less than one hundred eighty-eight (188) pounds per square inch. Unstabilized brick may be used where existing bricks are unstabilized and where the building is not susceptible to flooding conditions or direct exposure. Adobe may be allowed a maximum value of three (3) pounds per square inch for shear with no increase for lateral forces.

(4) Mortar may he of the same soil composition and stabilization as the brick in lieu of cement mortar.

(5) Nominal tension stresses due to seismic forces normal to the wall may be neglected if the wall meets thickness requirements and shear values allowed by this subsection.

(c) ARCHAIC MATERIALS. Allowable stresses for archaic materials not specified in this code shall be based on substantiating research data or engineering judgment, subject to the Building Official's satisfaction.

(d) ALTERNATIVE MATERIALS AND SHBC ADVISORY REVIEW. Alternative materials, design or methods of construction will be considered as set forth in in the 2019 CBC and California Historical Building Code. In addition, when a request for an alternative proposed design, material or method of construction is being considered, the Building Official may file written request for opinion to the State Historical Building Code Advisory Board for its consideration, advice or findings in accordance with the State Historical Building Code.

(Prior code § 8257)

(Ord. No. 2356, § 25, 2-26-2014; Ord. No. 2392, § 32, 1-25-2017; Ord. No. 2421, § 17, 5-13-2020; Ord. No. 2424, § 17, 5-27-2020)

Editor's note— Ord. No. 2421, § 17, adopted May 13, 2020, changed the title of § 15.36.080 from "CBC Section 1613.8 added—Historical buildings" to read as herein set out.

(a) GENERAL. Every structure within the scope of this section shall be analyzed and constructed to comply with the regulations and requirements in the 2019 CBC.

(b) LATERAL FORCES ON ELEMENTS OF STRUCTURES. Parts or portions of structures shall be analyzed and designed for lateral loads in accordance with requirements set forth in the 2019 CBC including ASCE 7-10 Chapters 13 through Chapter 15.

(c) ANCHORAGE. Anchorage all parts, portions and elements of the building or structure shall be analyzed, designed and provided in accordance with Section 1604.8, Chapter 16 of 2019 CBC.

(d) Unreinforced Masonry Walls. Except as modified herein, unreinforced masonry walls shall be analyzed to withstand all vertical loads in addition to the lateral seismic forces required in the 2019 CBC. No allowable tension stress will be permitted in unreinforced masonry walls. Walls not capable of resisting the required design forces specified in this section shall be strengthened or shall be removed and replaced.

EXCEPTIONS: (1) Unreinforced masonry walls in buildings not classified as a Risk Category Classification I Occupancy shall be analyzed in accordance with the 2019 CBC requirements. (2) Unreinforced masonry walls which carry no design loads other than their own weight may be considered as veneer if they are adequately anchored to new supporting elements.

(e) COMBINATION OF VERTICAL AND SEISMIC FORCES.

(1) New Materials. All new materials introduced into the structure to meet the requirements of this section which are subjected to combined vertical and horizontal forces shall comply with building requirements of the 2019 California Building Code.

(2) Existing Materials. When stresses in existing lateral force-resisting elements are due to a combination of dead loads plus seismic loads, the allowable working stress specified in the code may be increased thirty-three (33) percent.

(Prior code § 8258)

(Ord. No. 2356, § 26, 2-26-2014; Ord. No. 2392, § 33, 1-25-2017; Ord. No. 2421, § 18, 5-13-2020; Ord. No. 2424, § 18, 5-27-2020)

Editor's note— Ord. No. 2421, § 18, adopted May 13, 2020, changed the title of § 15.36.090 from "CBC Section 1613.8 added—Analysis and design" to read as herein set out.

(a) GENERAL. All material permitted by this code, including their appropriate allowable stresses and those existing configurations of materials specified herein, may be utilized to meet the requirements of this division.

(b) EXISTING MATERIALS.

(1) Unreinforced Masonry Walls. Unreinforced masonry walls analyzed in accordance with this section may provide vertical support for roof and floor construction and resistance to lateral loads.

Tension stresses due to seismic forces normal to the wall may be neglected if the wall does not exceed the height-or length-to-thickness ratio and the in-plane shear stresses due to seismic loads as set forth in Table No. 23-R.

If the wall height-thickness ratio exceeds the specified limits, the wall may be supported by vertical bracing members designed in accordance with this Chapter. The deflection of such bracing member at design loads shall not exceed one tenth (1/10th) of the wall thickness.

All vertical bracing members shall he attached to floor and roof construction for their design loads independently of required wall anchors. Horizontal spacing of vertical bracing members shall not exceed one-half (½) the unsupported height of the wall nor ten (10) feet.

The wall height may be measured to bracing elements other than a floor or roof. Spacing of the bracing elements and wall anchors shall not exceed six (6) feet. Bracing elements shall be detailed to minimize the horizontal displacement of the wall by components of vertical displacements of the floor or roof.

(2) Existing Roof, Floor, Walls, Footings and Wood Framing, Existing materials, including wood shear walls utilized in the described configuration, may be used as part of the lateral load resisting system: provided, that the stresses in these materials do not exceed the value shown in Table No. 23-S.

(c) STRENGTHENING OF EXISTING MATERIALS. New materials, including wood shear walls, may be utilized to strengthen portions of the existing seismic resisting system in the described configurations; provided, that the stresses do not exceed the values shown in Table No. 23-S.

(d) ALTERNATE MATERIALS. Alternate materials, designs, and methods of construction may be approved by the Building Official in accordance with the provisions of the California Building Code.

(e) MINIMUM ACCEPTABLE QUALITY OF EXISTING UNREINFORCED MASONRY WALLS.

(1) General Provisions. All unreinforced masonry walls utilized to carry vertical loads and seismic forces parallel and perpendicular to the wall plane shall be tested as specified in this subsection. All masonry quality shall equal or exceed the minimum standards established herein or shall be removed and replaced by new materials. Alternate methods of testing may be approved by the Building Official. The quality of mortar in all masonry walls shall be determined by performing in-place shear tests or by testing eight (8) inch diameter cores. Alternative methods of testing may be approved by the Building Official. Nothing shall prevent pointing with mortar of all the masonry wall joints before the tests are first made. Prior to any pointing, the mortar joints must be raked and cleaned to remove loose and deteriorated mortar. Mortar for pointing shall be Type S or N except masonry cements shall not be used. All preparation and mortar pointing shall be done under continuous inspection of a registered deputy building inspector. At the conclusion of the inspection, the inspector shall submit a written report to the licensed engineer or architect responsible for the seismic analysis of the building setting forth the result of the work inspected. Such report shall be submitted to the Building Official for approval as part of the structural analysis. All testing shall be performed in accordance with the requirements specified in this subsection by a testing agency approved by the Building Official. An accurate record of all such tests and their location in the building shall be recorded and these results shall be submitted to the Building Official for approval as part of the structural analysis.

(2) Number and Location of Tests. The minimum number of tests shall be two (2) per wall or line of wall elements resisting a common force, or one (1) per fifteen hundred (1,500) square feet of wall surface, with a minimum of eight (8) tests in any case. The exact test or core location shall be determined at the building site by the licensed engineer or architect responsible for the seismic analysis of the subject building.

(3) In-Place Shear Tests. The bed joints of the outer width of the masonry shall be tested in shear by laterally displacing a single brick relative to the adjacent bricks in the width. The opposite head joint of the brick to be tested shall be removed and cleaned prior to testing. The minimum quality mortar in eighty (80) percent of the shear tests shall not be less than the total of thirty (30) psi plus the axial stress in the wall at the point of the test. The shear stress shall be based on the gross area of both bed joints and shall be that at which movement of the brick is first observed.

(4) Core Tests. A minimum number of mortar test specimens equal to the number of required cores shall be prepared from the cores and tested as specified herein. The mortar joint of the outer with of the masonry core shall be tested in shear by placing the circular core section in a compression testing machine with the mortar bed joint rotated fifteen (15) degrees from the axis of the applied load. The mortar joint tested in shear shall have an average ultimate stress of twenty (20) psi based on the gross area. The average shall be obtained from the total number of cores made. The average shall be obtained from the total number of cores made. If test specimens cannot be made from cores taken then shear value shall be reported as zero.

(f) TESTING OF SHEAR BOLTS. One-fourth (¼) of all new shear bolts and dowels embedded in unreinforced masonry walls shall be tested by a registered deputy building inspector using a torque calibrated wrench to the following minimum torques:

One-half (½) inch diameter bolts or dowels—forty (40) foot-lbs.

Five-eighths (⅝) inch diameter bolts or dowels—fifty (50) foot-lbs.

Three-fourths (¾) inch diameter bolts or dowels—sixty (60) foot-lbs.

No bolts exceeding one-fourth (¼) inch shall be used. All nuts shall be installed over malleable iron or plate washers when bearing on wood, and heavy cut washers when hearing on steel.

(g) DETERMINATION OF ALLOWABLE STRESSES FOR DESIGN METHODS BASED ON TEST RESULTS.

(1) Design Shear Values. Design seismic in-place shear stresses shall be substantiated by tests performed as specified in the 2019 CBC. Design stresses shall be related to test results obtained in accordance with Table No. 23-U. Intermediate values between three (3) and ten (10) psi may be interpolated.

(2) Design Compression and Tension Values. Compression stresses for unreinforced masonry having a minimum design shear value of three (3) psi shall not exceed one hundred (100) psi. Design tension values for unreinforced masonry shall not be permitted.

(h) Five (5) percent of the existing rod anchors utilized as all or part of the required wall anchors shall be tested in pullout by an approved testing laboratory. The minimum number tested shall be four (4) per floor, with two (2) tests at walls with joist framing into the wall and two (2) tests at walls with joist parallel to the wall. The test apparatus shall be supported on the masonry wall of a minimum distance of the wall thickness from the anchor tested. The rod anchor shall be given a preload of three hundred (300) pounds prior to establishing a datum for recording elongation. The tension test load report shall be recorded at one-eighth (⅛) inch relative movement of the anchor and the adjacent masonry surface. Results of all tests shall be reported. The report shall include the test results as related to the wall thickness and joint orientation. The allowable resistance value of the existing anchors shall be forty (40) percent of the average of those tested anchors having the same wall thickness and joint orientation.

(i) Qualification tests for devices used for wall anchorage shall be tested with the entire tension load carried on the enlarged head at the exterior face of the wall. Bond on the part of the device between the enlarged head and the interior wall face shall be eliminated for the qualification tests. The resistance value assigned the device shall be twenty (20) percent of the average of the ultimate loads.

(Prior code § 8259)

(Ord. No. 2356, § 27, 2-26-2014; Ord. No. 2392, § 34, 1-25-2017; Ord. No. 2421, § 19, 5-13-2020; Ord. No. 2424, § 19, 5-27-2020)

Editor's note— Ord. No. 2421, § 19, adopted May 13, 2020, changed the title of § 15.36.100 from "CBC Section 1613.10 added—Materials of construction" to read as herein set out.

(a) GENERAL. In addition to the seismic analysis required pursuant to this Chapter, the licensed engineer or architect responsible for the seismic analysis of the building shall determine and record the information required by this section on the approved plans.

(b) CONSTRUCTION DETAILS. The following requirements with appropriate construction details shall be made part of the approved plans:

(1) All unreinforced masonry walls shall be anchored at the roof level by tension bolts through the wall as specified in Table No. 23-T, or by approved equivalent at a maximum anchor spacing of six (6) feet.

All unreinforced masonry walls shall be anchored at all floors with tension bolts through the wall or by existing rod anchors at a maximum anchor spacing of six (6) feet. All existing rod anchors shall be secured to the joists to develop the required forces. The Building Official may require testing to verify the adequacy of the embedded ends of existing rod anchors. Tests when required shall conform to the 2019 CBC requirements.

When access to the exterior face of the masonry wall is prevented by proximity of an existing building, wall anchors conforming to Item 5 and 6 in Table 23-T may be used.

Alternative devices to be used in lieu of tension bolts for masonry wall anchorage shall be tested as specified in the 2019 CBC requirements.

(2) Diaphragm chord stresses of horizontal diaphragm shall be developed in existing materials or by addition of new materials.

(3) Where trusses and beams other than rafters or joists are supported on masonry, ledges or columns shall be installed to support vertical loads of the roof or floor members.

(4) Parapets and exterior wall appendages not capable of resisting the forces specified in this section shall be removed, stabilized or braced to ensure that the parapets and appendages remain in their original position.

(5) All deteriorated mortar joints in unreinforced masonry walls shall be pointed with Type S or N mortar. Prior to any pointing, the wall surface must be raked and cleaned to remove loose and deteriorated mortar. All preparation and pointing shall he done under continuous inspection of a registered deputy building inspector certified to inspect masonry or concrete. At the conclusion of the project, the inspector shall submit a written report to the Building Official setting forth the portion of work inspected.

(6) Repair details of any cracked or damaged unreinforced masonry wall required to resist forces specified in this division.

(c) EXISTING CONSTRUCTION. The following existing construction information shall be made part of the approved plans:

(1) The type and dimensions of existing walls and the size and spacing of floor and roof members.

(2) The extent and type of existing wall anchorage to floors and roof.

(3) The extent and type of parapet corrections which had been performed on the building subsequent to initial construction.

(4) Accurately dimensioned floor plans and masonry wall elevations showing dimensioned openings, piers, wall thickness and heights.

(5) The location of cracks and damaged portions of unreinforced masonry walls requiring repairs.

(6) The type of interior wall surfaces and if reinstalling or anchoring of ceiling plaster is necessary.

(7) The general condition of the mortar joints and if joints need pointing.

(Prior code § 8260)

(Ord. No. 2356, § 28, 2-26-2014; Ord. No. 2392, § 35, 1-25-2017; Ord. No. 2421, § 20, 5-13-2020; Ord. No. 2424, § 20, 5-27-2020)

Editor's note— Ord. No. 2421, § 20, adopted May 13, 2020, changed the title of § 15.36.110 from "CBC Section 1613.11 added—Information required on plans" to read as herein set out.

TABLE NO. 23-M RISK CATEGORY OCCUPANCY

(Prior code § 8261 (part))

(Ord. No. 2356, § 29, 2-26-2014; Ord. No. 2421, § 21, 5-13-2020; Ord. No. 2424, § 21, 5-27-2020)

Editor's note— Ord. No. 2421, § 21, adopted May 13, 2020, changed the title of § 15.36.120 from "Table 23-M added to CBC Chapter 16—Rating classifications" to read as herein set out.

TABLE NO. 23-N TIME LIMITS FOR COMPLIANCE

* Measured from completion date of structural analysis.

** Measured from the date of building permit issuance.

(Prior code § 8261 (part))

(No. 2356, § 30, 2-26-2014; Ord. No. 2421, § 22, 5-13-2020; Ord. No. 2424, § 22, 5-27-2020)

Editor's note— Ord. No. 2421, § 22, adopted May 13, 2020, changed the title of § 15.36.130 from "Table 23-N added to CBC Chapter 16—Time limits for compliance" to read as herein set out.

TABLE NO. 23-O HORIZONTAL FORCE FACTORS BASED ON RISK CATEGORY OCCUPANCY

(Prior code § 8261 (part))

(Ord. No. 2356, § 31, 2-26-2014; Ord. No. 2421, § 23, 5-13-2020; Ord. No. 2424, § 23, 5-27-2020)

Editor's note— Ord. No. 2421, § 23, adopted May 13, 2020, changed the title of § 15.36.140 from "Table 23-O added to CBC Chapter 16—Horizontal force factors based on rating classification" to read as herein set out.

TABLE NO. 23-P HORIZONTAL SEISMIC FORCE IMPORTANT FACTORS "Ie" FOR PARTS OR PORTIONS OF STRUCTURES

(Prior code § 8261 (part))

(Ord. No. 2356, § 32, 2-26-2014; Ord. No. 2421, § 24, 5-13-2020; Ord. No. 2424, § 24, 5-27-2020)

Editor's note— Ord. No. 2421, § 24, adopted May 13, 2020, changed the title of § 15.36.150 from "Table 23-P added to CBC Chapter 16—Horizontal force factors "IS" for parts or portions of structures" to read as herein set out.

Horizontal force factor for parts or portions of buildings or other structures shall be designed and constructed in comply with the requirements and regulations in 2019 CBC including ASCE 7-10 Chapters 13 through 15

(Prior code § 8261 (part))

(Ord. No. 2356, § 33, 2-26-2014; Ord. No. 2392, § 36, 1-25-2017; Ord. No. 2421, § 25, 5-13-2020; Ord. No. 2424, § 25, 5-27-2020)

Editor's note— Ord. No. 2421, § 25, adopted May 13, 2020, changed the title of § 15.36.160 from "Table 23-Q added to CBC Chapter 16—Horizontal force factor "Cp" for parts or portions of buildings or other structures" to read as herein set out.

Table 23-R is added to Chapter 16 of the California Building Code to read:

TABLE NO. 23-R ALLOWABLE VALUE OF HEIGHT-THICKNESS RATIO OF UNREINFORCED MASONRY WALLS WITH MINIMUM QUALITY MORTAR1

1 Table No. 23-R is not applicable to buildings of Risk Category Occupancies III and IV. Walls of buildings with Risk Category III and IV shall be analyzed and constructed in accordance with 2019 CBC.

(Prior code § 8261 (part))

(Ord. No. 2356, § 34, 2-26-2014; Ord. No. 2392, § 37, 1-25-2017; Ord. No. 2421, § 26, 5-13-2020; Ord. No. 2424, § 26, 5-27-2020)

Editor's note— Ord. No. 2421, § 26, adopted May 13, 2020, changed the title of § 15.36.170 from "Table 23-R added to CBC Chapter 16—Allowable value of height-thickness ratio of unreinforced masonry walls with minimum quality mortar" to read as herein set out.

Table 23-S is added to Chapter 16 of the California Building Code to read:

TABLE NO. 23-S VALUES FOR EXISTING MATERIALS

1 Material must be sound and in good condition.

2 Stresses given may be increased for combinations of loads as specified in LABC 8808 Document P/BC 2020-053.

(Prior code § 8261 (part))

(Ord. No. 2356, § 35, 2-26-2014; Ord. No. 2421, § 27, 5-13-2020; Ord. No. 2424, § 27, 5-27-2020)

Editor's note— Ord. No. 2421, § 27, adopted May 13, 2020, changed the title of § 15.36.180 from "Table 23-S added to CBC Chapter 16—Values for existing materials" to read as herein set out.

TABLE NO. 23-T

ALLOWABLE VALUES OF NEW MATERIALS USED IN CONJUNCTION WITH EXISTING CONSTRUCTION

1 Bolts and dowels to be tested as specified in LABC 8808 (Document No P/BC 2020-053).

2 Bolts and dowels to be ½-inch minimum in diameter.

3 Drilling for bolts and dowels shall be done with an electric rotary drill. Impact tools shall not be used for drilling holes or tightening anchor and shear bolt nuts.

(Prior code § 8261 (part))

(Ord. No. 2356, § 36, 2-26-2014; Ord. No. 2392, § 38, 1-25-2017; Ord. No. 2421, § 28, 5-13-2020; Ord. No. 2424, § 28, 5-27-2020)

Editor's note— Ord. No. 2421, § 28, adopted May 13, 2020, changed the title of § 15.36.190 from "Table 23-T added to CBC Chapter 16—Allowable values of new materials used in conjunction with existing construction" to read as herein set out.

TABLE NO. 23-U ALLOWABLE SHEAR STRESS FOR TESTED UNREINFORCED MASONRY WALLS

* Allowable shear stress may be increased by addition of 10 percent of the axial stress due to the weight of the wall directly above.

(Prior code § 8261 (part))

(Ord. No. 2356, § 37, 2-26-2014; Ord. No. 2421, § 29, 5-13-2020; Ord. No. 2424, § 29, 5-27-2020)

Editor's note— Ord. No. 2421, § 29, adopted May 13, 2020, changed the title of § 15.36.200 from "Table 23-U added to CBC Chapter 16—Allowable shear stress for tested unreinforced masonry walls" to read as herein set out.

Editor's note— Ord. No. 2392, § 39, adopted Jan. 25, 2017, deleted § 15.36.210, which pertained to UBC Section 3205(d) added—fire and draftstops, and derived from prior code § 8262.

Notwithstanding the provisions of Section 17.22.210 (A) of the Montebello Municipal Code, repairs or alterations to structures made pursuant to this chapter shall not require an offer of dedication to the city. In the event that a building is totally demolished, dedication shall be required upon any reconstruction.

(Prior code § 8261)