PHC管桩柱在不同轴压比下抗震性能的有限元分析

Finite Element Analysis of Seismic Behavior of PHC Pipe Piles under Different Axial Compression Ratios

在已有实验的基础上,利用ABAQUS有限元软件,对不同轴压比下的PHC管桩柱进行数值模拟分析,研究轴压比分别为0.018、0.18、0.36.0.55.0.65.0.75的6根PHC管桩柱的抗震性能,梳理6个试件的滞回曲线和骨架曲线,分析各轴压比下PHC管桩柱的承载力、延性等变化规律。研究表明:在一定范围内,通过增大轴压比的方式能够增大PHC管桩柱的水平抗震承载力;轴压比的增大会引起PHC管桩柱延性的降低,造成脆性的破坏,建议将PHC-AB500(100)管桩柱的设计轴压比控制在0.55以内。

On the basis of existing experiments,using ABAQUS finite element software,carry out numerical simulation analysis on PHC pipe piles under different axial compression ratios,study the seismic performance of six PHC pipe piles with axial compression ratios of 0.018,0.18,0.36,0.55,0.65 and 0.75 respectively,sort out the hysteretic curve and skeleton curve of six test pieces,and analyze the change rules of bearing capacity,ductility,and other characteristics of PHC pipe piles under various axial compression ratios.The study shows that in a certain range,the horizontal seismic bearing capacity of PHC pipe pile can be increased by increasing axial compression ra-tio,and the increase of axial compression ratio will lead to the decrease of ductility and brittle failure of PHC pipe pile.It is suggested that the design axial compression ratio of PHC-AB500 pipe pile should be controlled within 0.55.