Transmission And Substation Foundations - Technical Design Manual (TD06088E)

Figure 5-17. Lateral Resistance Methods

DESIGN METHODOLOGY Figures 4-18 and 4-19 are sample LPILE PLUS plots of lateral shaft deflection and bending moment vs. depth where the top of the pile is fixed against rotation. From results like these, the designer can quickly determine the lateral response at various horizontal loads up to the structural limit of the pile, which is typically bending. Many geotechnical consultants use LPILE PLUS or other soil-structure- interaction programs to predict soil-pile response to lateral loads. Finite Difference Method Several computer programs, such as LPILEPLUS (ENSOFT, Austin, TX) are revisions of the COM624 program (Matlock and Reese) and its predecessor Beam-Column 28 (Matlock and Haliburton) that both use the p-y concept, i.e., soil resistance is a non-linear function of pile deflection, which was further developed by Poulos (1973). This method is versatile and provides a practical design method. This is made possible by the use of computers to solve the governing non-linear, fourth-order differential equation, which is explained in greater detail on page 4-20. Lateral load analysis software gives the designer the tools necessary to evaluate the force-deflection behavior of a helical pile/anchor embedded in soil.

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