软土基础核岛厂房振动台试验数值模拟分析  

Numerical simulation analysis of shaking table test of nuclear island plant on soft soil foundation

作　　者：上官云翔 陈少林 吕昊 景立平[3] SHANGGUAN Yunxiang;CHEN Shaolin;LV Hao;JING Liping(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Safe and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]南京航空航天大学民航学院,江苏南京210016 [2]山东科技大学安全与环境工程学院,山东青岛266590 [3]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2024年第4期46-61,共16页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(U2039209,51978337)。

摘　　要：采用土-结相互作用分区分析方法(partitioned analysis of soil-structure interaction,PASSI),对软土地基核岛厂房振动台试验中的筏基-混凝土框架模型以及桩基-混凝土框架模型进行了数值模拟,对比分析了振动台试验结果与数值模拟结果,并对软土地基下核岛厂房土-基础-结构的地震响应特征进行了分析。对2种模型输入调幅为0.05、0.10、0.20 g的RG160、Chi-Chi与Landers地震波,对比分析了各工况下振动台试验与数值模拟的土体与结构加速度放大系数、楼层反应谱、筏基底部土压力时程、桩身应变以及桩身弯矩。结果表明:数值模拟结果能较好地反映振动台试验结果;经过土层放大作用,随着楼层的增高,振动台试验和数值模拟中的加速度放大系数随之增大,反映了同样的规律;振动台试验与数值模拟所得的土-结体系的反应谱均与输入地震动频谱特征及体系的振动特性相关;振动台试验中,筏板基础会出现倾覆现象,筏基底部土压力时程表现出“东高西低”的现象,但数值模拟中筏基底部的土压力时程未出现此种现象,其原因是数值模拟中未考虑土体与基础的接触非线性;数值模拟中群桩的地震响应与试验的宏观现象基本吻合,定量上有差异,是数值模拟中未考虑桩的非线性所致。In this paper,the method of partitioned analysis of soil-structure interaction(PASSI)is used to simulate the raft foundation-concrete frame model and pile foundation-concrete frame model in the shaking table test of nuclear island plant on soft soil foundation.The RG160,Chi-Chi and Landers seismic waves with amplitude modulation of 0.05 g,0.10 g and 0.20 g were chose as input to the two models.Under various working conditions,the soil and structure acceleration amplification coefficient,floor response spectrum,time history of soil pressure at the bottom of raft foundation,pile strain and pile bending moment of shaking table test and numerical simulation test are compared and analyzed.The results show that:the numerical simulation results can reflect the shaking table test results well.After the amplification of soil layer,with the increase of floor,the coefficient of acceleration amplification increases in shaking table test and numerical simulation test,reflecting the same pattern.The response spectrum of soil-structure system obtained by shaking table test and numerical simulation is related to the frequency spectrum characteristics of input ground motion and the vibration characteristics of the system.In the shaking table test,the raft foundation will be overturned,and the time history of soil pressure at the bottom of the raft foundation shows the phenomenon of‘high in the east and low in the west’.However,this phenomenon does not appear in the time history of soil pressure at the bottom of the raft foundation in the numerical simulation.The reason is that the contact nonlinearity between the soil and the foundation is not considered in the numerical simulation.The seismic response of the pile group in the numerical simulation is basically consistent with the macroscopic phenomenon of the test,and there is a quantitative difference,which may be caused by the nonlinearity of the pile in the numerical simulation.

关 键 词：软土地基 核岛厂房 地震响应 土-结相互作用 数值模拟 

分 类 号：TU447[建筑科学—岩土工程]