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Overturning effects at the soil–foundation interface are permitted to be reduced by 10% for foundations of structures designed by the modal analysis requirements of ASCE Section 12.9.
Strength Design for Foundation Geotechnical Capacity
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The nominal foundation geotechnical capacity, Qns,described in ASCE 12.13.5.1, is controlled by the user.
Resistance Factors
The resistance factors are used for all foundation types' vertical, lateral, and rocking resistance. Nominal foundation geotechnical capacities, Qns, are multiplied by the resistance factors (ϕ) shown in ASCE Table 12.13-1.
Direction and Type of Resistance | Resistance Factors, ϕ |
|---|---|
Compression (bearing) strength | 0.45 |
Pile friction (either upward or downward) | 0.45 |
Lateral bearing pressure | 0.5 |
Sliding (by either friction or cohesion) | 0.85 |
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For linear seismic analysis procedures, factored loads should not exceed foundation design strengths, ϕ*Qns.
Foundation Design
Foundations are designed to support gravity and design earthquake loads, as indicated in the basic load combinations of Section 12.4, using the reduced soil bearing capacity, as shown in the geotechnical investigation report, considering the effects of liquefaction caused by MCEG earthquake motions.
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