Section 1811A — PRESTRESSED ROCK AND SOIL FOUNDATION ANCHORS — 2025 California Building Code (Title 24, Part 2)

1811A.1 General. ¶

1811A.1 General. The requirements of this section address the use of vertical rock and soil anchors in resisting seismic or wind overturn- ing forces resulting in tension on shallow foundations.

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1811A.2 Adoption. ¶

1811A.2 Adoption. Except for the modifications as set forth in Sections 1811A.3 and 1811A.4, all prestressed rock and soil foundation anchors shall comply with PTI Recommendations for Prestressed Rock and Soil Anchors.

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1811A.3 Geotechnical requirements. ¶

1811A.3 Geotechnical requirements. Geotechnical report for the prestressed rock and soil foundation anchors shall address the following: 1. Minimum diameter and minimum spacing for the anchors including consideration of group effects. 2. Maximum unbonded length and minimum bonded length of the tendon. 3. Maximum recommended anchor tension capacity based upon the soil or rock strength/grout bond and anchor depth/spacing. 4. Allowable bond stress at the ground/grout interface and applicable factor of safety for ultimate bond stress. 5. Anchor axial tension stiffness recommendations at the…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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1811A.4 Structural Requirements. ¶

1811A.4 Structural Requirements. 1. Tendons shall be thread-bar anchors conforming to ASTM A722. 2. The anchors shall be placed vertical. 3. Design loads shall be based upon the load combinations in Section 2.4 of ASCE 7 and shall not exceed 60 percent of the speci- fied minimum tensile strength of the tendons. 4. Ultimate load shall be based upon Section 1617A.1.15 and shall not exceed 80 percent of the specified minimum tensile strength of the tendons. 5. The anchor shall be designed to fail in grout bond to the soil or rock before pullout of the soil wedge by group effect. 6. Foundation…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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