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Simplified Method for Evaluating Seismic Performance of Pile Foundation

ZHANG De-wen1,ZHANG Jian-min2(1.Department of Civil Engineering,Tamkang University,Taipei,Taiwan 25137; 2.State Key Laboratory of Hydroscience and Engineering / School of Civil Engineering,Tsinghua University,Beijing 100084)  
Performance based design for pile foundations can be analyzed on bearing capacities and deformations.The foundation capacities are often computed knowing the superstructural loads and their combinations.The design needs to consider ordinary and special conditions.Conventional calculation methods or other reliable methods can be adopted.Influence factors are assessed by probability and/or reliability analyses to match the PBD requirements.On the other hand,foundation deformations can be analyzed further.The effects of seismic forces,soil parameters and geological structure could be evaluated independently.This paper introduces the seismic PBD analysis on piles using one-dimensional wave equation analysis and the so called PBEE analysis.A case study is discussed on the bridge pile foundations.The key issues in the analysis are design PGA,accelerogram,pile dimensions and the amount of steel bars in use.It is found that if the soil liquefaction influence could be negligible,then the maximum bending moment would occur at pile head,in which to increase the ductility of the pile at the pile head will help the seismic performance of the piles.
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