ANALYSIS OF LATERAL RESPONSE OF BORED PILES BASED ON CONCRETE DAMAGED PLASTICITY MODEL
CAI Zhongxiang1，LIU Shannan2，GAO Chengyong1，HOU Shengnan1
(1. East China Architectural Design and Research Institute，Shanghai 200041，China； 2. College of Urban Railway Transportation，Shanghai University of Engineering Science，Shanghai 201620，China)
Abstract：The lateral bearing capacity of piles is an important parameter for horizontal deformation of building and seismic checking of piles. The determination of test pile is under free-head condition. However，the widely used pile-raft foundations provide a strong constraint for the rotation of pile head. Linear solutions of differential equation for single piles are available and implemented in the traditional design methods. Thus，a numerical analysis is presented to study the behavior of laterally loaded pile based on the concrete damaged plasticity model. After validation with the in-situ test of bored piles in shanghai typical soft soil，the vertical load，reinforcement ratio and fixed-head constraint are considered for the lateral bearing capacity of bored piles. The analysis show that vertical load is benefit for the lateral bearing capacity of piles due to compressive stress. The increment of reinforcement ratio can increase the lateral bearing capacity to some extern，and mainly improve the ductility of piles. The constraint of pile head can increase the bearing capacity to a large extern. The increment factor from the numerical simulation has a significant difference with the m method based on elastic reaction assumption，and further study is hoped in the in-situ test.
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2014, Vol. 33 
