基于不同桩基模拟方式的大块式基础动力数值分析  

Dynamic Numerical Analysis of Large Block Bases on Different Pile Foundations

作　　者：刘佳俊 陈思佳 宋晓冰[1] 张子墨 LIU Jiajun;CHEN Sijia;SONG Xiaobin;ZHANG Zimo(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《噪声与振动控制》2024年第3期259-266,共8页Noise and Vibration Control

摘　　要：为了更合理预测采用桩基的大块式基础的动力特性,建立桩基仿真模型并与桩-土动力试验相互验证,对组合桩基模型与大块式基础模型进行有限元数值分析,同时参考设计院所使用以弹簧单元模拟桩基的方式,建立数值模型并进行分析,探讨不同的桩基模拟方式对大块式基础动力特性的影响。研究结果表明:使用弹簧单元模拟桩基的方式忽略桩土质量、阻尼的影响,会造成大块式基础振型缺失、自振频率整体偏大、强迫振动响应被放大;使用桩基仿真模型更能反映大块式基础动力特性但计算成本增加。上述结论可为采用桩基的大块式基础动力特性研究提供参考。In order to reasonably predict the dynamic characteristics of the large block base on pile foundation,a pile foundation simulation model is established and verified by the pile-soil dynamic test.The composite pile foundation model and the large block base model are used for finite element numerical analysis with the use of spring element to simulate the pile foundation.The model is analyzed and the impact of different pile foundation simulation methods on the dynamic characteristics of the large block base is discussed.The results show that the method of using spring element to simulate pile foundation neglects the effect of pile and soil mass and damping,which will make the vibration mode of the large block base missing,the overall natural frequency larger,and the forced vibration response be amplified;While the pile foundation simulation model can reasonably reflect the dynamic characteristics of the large block base,but the calculation cost increases.The above conclusions may provide a reference for the study of dynamic characteristics of large block bases on pile foundations.

关 键 词：振动与波 大块式基础 桩基仿真模型 有限元数值分析 强迫振动响应 弹簧单元 

分 类 号：TU476.1[建筑科学—结构工程]