P-Δ效应对高桩承台体系推倒分析方法的影响研究

Study of P-Δ Effect Influence on Push-over Analysis Method for Elevated Pile Foundation

通过对不同桩自由长度的高桩承台体系进行推倒分析,得到了考虑P-Δ效应和不考虑P-Δ效应时高桩承台体系的能力曲线,并通过定义能力减小率的方法将P-Δ效应对高桩承台体系能力曲线的影响表示出来.结果表明,当高桩承台体系进入屈服阶段以后,随着桩自由长度的增加,P-Δ效应对高桩承台体系能力曲线的影响逐渐增大.

The elevated pile foundations are analyzed by using push-over analysis method due to different unconstrained lengths, and the capacity curves of elevated pile foundations are obtained with or without considering P-Δ effect. P-Δ effect influence on capacity curve is showed by capacity reduction ratio. The resuits show that the P-Δ effect influence on capacity curve gradually increases with the unconstrained length increasing,especially after the yield point.