Section 2205

The design, fabrication and erection of structural steel elements in buildings, structures and portions thereof shall be in accordance with AISC 360.

Exceptions : [OSHPD 1R, 2 & 5]

1. For members designed on the basis of tension, the slenderness ratio (L/r) shall not exceed 300, except for the design of hangers and bracing in accordance with NFPA 13 and for rod hangers in tension.

2. For members designed on the basis of compression, the slenderness ratio (KL/r) shall not exceed 200, except for the design of hangers and bracing in accordance with NFPA 13.

Where required, the seismic design, fabrication and erection of buildings, structures and portions thereof shall be in accordance with Section 2205.2.1 or 2205.2.2, as applicable.

2205.2.1 Structural steel seismic force-resisting sys- tems. The design, detailing, fabrication and erection of structural steel seismic force-resisting systems shall be in

accordance with the provisions of Section 2205.2.1.1 or 2205.2.1.2, as applicable.

2205.2.1.1 Seismic Design Category B or C. Structures assigned to Seismic Design Category B or C shall be of any construction permitted in Section 2205. Where a response modification coefficient, R, in accordance with ASCE 7, Table 12.2-1, is used for the design of structures assigned to Seismic Design Category B or C, the structures shall be designed and detailed in accordance with the requirements of AISC 341.

Exception: The response modification coefficient, R, designated for “Steel systems not specifically detailed for seismic resistance, excluding cantilever column systems” in ASCE 7, Table 12.2-1, shall be permitted for systems designed and detailed in accordance with AISC 360, and need not be designed and detailed in accordance with AISC 341.

2205.2.1.2 Seismic Design Category D, E or F. Structures assigned to Seismic Design Category D, E or F shall be designed and detailed in accordance with AISC 341, except as permitted in ASCE 7, Table 15.4-1.

[OSHPD 1R, 2 & 5] All structural steel seismic force- resisting systems in ASCE 7 Table 15.4-1 shall be designed in accordance with AISC 341.

2205.2.2 Structural steel elements. The design, detailing, fabrication and erection of structural steel elements in seismic force-resisting systems other than those covered in Section 2205.2.1, including struts, collectors, chords and foundation elements, shall be in accordance with AISC 341 where either of the following applies:

1. The structure is assigned to Seismic Design Category D, E or F, except as permitted in ASCE 7, Table 15.4-1.

2. A response modification coefficient, R, greater than 3 in accordance with ASCE 7, Table 12.2-1, is used for the design of the structure assigned to Seismic Design Category B or C.

2205.3.1 Section A4. Replace Section A4.1 Item (c) as fol- lows:

(c) Locations and dimensions of protected zones. The fab- ricator shall permanently mark protected zones of struc- tural elements in the seismic force-resisting system in the building that are designated on the construction docu- ments. If these markings are obscured during construc- tion, such as after the application of fire protection, the owner’s designated representative shall re-mark the pro- tected zones as they are designated on the construction documents. Primers or paints used to mark protected zones on steel surfaces, which are to receive sprayed fire- resistance material, shall comply with California Building Code Section 704.13.3.2.

284 2019 CALIFORNIA BUILDING CODE

Copyright © 2019 ICC. ALL RIGHTS RESERVED. Accessed by Kevin Day (kevin.day@dgs.ca.gov), (California Building Standards Commission) Order Number #100735044 on Jul 24, 2019 03:54 PM (PDT) pursuant to License Agreement with ICC. No further reproduction or distribution authorized. Single user only, copying and networking prohibited. ANY UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT, AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.

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2205.3.2 Section I2. Replace Section I2.1 item (d) as fol- lows:

(d) Decking attachments that penetrate the beam flange shall not be placed on beam flanges within the protected zone, except power-actuated fasteners up to 0.18 in. diam- eter are permitted, provided that the penetration is less than 85% of beam flange thickness.

2205.4.1 Design Requirements, 2.1 Special and Interme- diate Moment Frame Connection Types, Table 2-1 Pre- qualified Moment Connections modifications. The prequalified bolted moment connections are not permitted in buildings.

Exceptions:

1. Erection bolts are permitted.

2. The approved moment connection in accordance with AISC 358 Chapter 10 as permitted by the exception to Section 2206.2.

3. Single-story Type V skilled nursing or intermedi- ate care facilities utilizing wood-frame or light- steel-frame construction.

2205.4.2 Moment Connection - Chapter 11. The welded sideplate steel moment connection shall be permitted pro- vided:

1. The beams shall consist of either rolled or built-up wide flange sections.

2. The biaxial dual-strong axis and column minor axis configurations of the moment connection shall be considered as an alternative system.

3. For SMF and IMF systems, U-shaped cover plates shall be used and the hinge-to-hinge span to beam depth, Lh/d, shall be greater than or equal to 5. 4. The width-to-thickness ratios for beam flanges shall not be less than 3.

5. The spacing for lateral bracing of wide flange beams, Lb, shall include the length of the side plate at beam ends.

6. The extension of the side plates beyond the face of the column shall be within the range of 0.77d to 1.0d.

7. The gap-to-side plate thickness ratio shall range from 2.1 to 2.3.

8. Demand critical fillet welds {2}, {5}, {5a} and {7} shall have Magnetic Particle Testing (MT) in accor- dance with AWS D1.1 for procedure, technique and acceptance. Inspect the beginning and end of these welds for a 6-inch length, plus any location along the length of the weld where a start and restart is visually noted for a distance of 6 inches on either side of the start/stop location.

STEEL