Lateral loading of shallow foundations

Paper No. 1 1 INTRODUCTION The resistance of shallow foundations to Lateral loads is often relied upon to transmit the base shear forces from the ground to a building during an earthquake. Considering the importance of this link in the Lateral load path it receives little attention in current design practice in New Zealand. An assumption is commonly made, either explicitly or implicitly, that the combination of sliding friction along the base of the structure and passive earth pressure acting against embedded foundation elements will have ample capacity to resist the design base shear. However, the actual mechanisms of Lateral load resistance for shallow foundations are quite complex and poorly understood. Development of passive earth pressure requires significant plastic deformations within the soil mass and corresponding large movements of the structure. The required earth deformations may not be compatible with the structure s geometry.

Paper No. 6.03.01 2 h k Qh F k a = 2 a + The “Flow-Under Failure” would apply only to very soft soils such as soft clays. If the foundation beams are spaced closely then a “Tip-to-Tip” failure may occur with shearing of the

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  Foundations, Loading, Lateral, Shallow, Lateral loading of shallow foundations

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