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建立三维有限模型,分别采用振型分解反应谱法和时程分析法研究刚性桩复合地基的抗震性能,并根据相似理论,建立刚性桩复合地基群桩模型,采用模型拟动力试验,对其进行了地震作用下桩体响应规律试验研究,并对其在不同方法下的结果进行了对比分析,结果表明:无论是弯矩值还是剪力值,都是角桩最大,其次是边桩,再次是中心桩;不同分析方法所得的位移值相差不大,位移分布比较均匀;而且通过观察试验现象、分析试验和理论数据可见刚性桩复合地基具有良好的抗震性能;模型动力试验方法用于研究刚性桩复合地基的抗震性能是可行的,并且可推广应用到类似性的其他复合地基的抗震性能试验研究。
The three-dimensional finite element model is established. The seismic response of the rigid pile composite foundation is studied by using the modal decomposition reaction time-history method and the time-history analysis. According to the similarity theory, the pile group model of the rigid pile composite foundation is established. The experimental study of the response of the pile under the action of earthquake is carried out. The results under different methods are compared and analyzed. The results show that both the bending moment and the shear force are the largest, followed by the side piles Is the central pile; the displacement values obtained by different analysis methods are not much difference, the displacement distribution is more uniform; and by observing the test phenomenon, analysis of experimental and theoretical data shows that rigid pile composite foundation with good seismic performance; model dynamic test method for the study of rigid The seismic performance of pile composite foundation is feasible and can be extended to study the seismic performance of other similar composite foundations.