考虑不同桩长影响的变电站配电楼地震反应分析  

Seismic response analysison substation distribution building considering influence of different pile length

作　　者：李明富 王亚敏 王朔 张海清 LI Mingfu;WANG Yamin;WANG Shuo;ZHANG Haiqing(Economic and Technological Research Institute,State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050000,China;College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China)

机构地区：[1]国网河北省电力有限公司经济技术研究院,石家庄050000 [2]河北大学建筑工程学院,保定071002

出　　处：《建筑结构》2022年第23期139-146,共8页Building Structure

基　　金：国网河北省电力有限公司科技项目资助“基于数值模拟的变电站软弱地基分析技术研究”(B704JY200081)。

摘　　要：从变电站桩基-筏板-配电楼结构耦合体系出发,采用PLAXIS 3D建立桩筏基础-地基-上部结构三维有限元整体模型,其中,土体非线性力学行为采用考虑小应变特性的双曲线型弹塑性(HSS)模型模拟,动力计算中采用自由场边界(模型四周)和柔性底部边界(模型底部)来模拟无限地基。通过整体模型动力时程分析,研究了3条典型地震波及其不同加速度峰值情况下长桩和短桩设计方案对应的上部结构及桩筏基础动力响应特性。结果表明:变电站配电楼虽然层数较低,在地震作用下楼顶仍然表现出一定的放大效应;考虑结构后的地表水平加速度峰值总体上高于自由场地的情况,距结构30m范围内地表水平加速度反应相对较大;桩长在一定范围内变化对上部结构的振动响应影响不大;上部结构的水平加速度峰值随输入地震动加速度峰值增加而增大,地下室底板中部弯矩极值对地震动加速度峰值及不同地震波波形均不敏感。Starting from the coupling system of pile foundation-raft-distribution building structure of a substation,the three-dimensional finite element model of pile raft foundation-ground-superstructure was established by using PLAXIS 3D.The nonlinear mechanical behavior of soil was simulated by hyperbolic elastic-plastic(HSS)model considering small strain characteristics.The free field boundary(around the model)and compliant base boundary(bottom of the model)were used to simulate the infinite ground.Through the dynamic time history analysis of the overall model,the dynamic response characteristics of the super structure supported by long or short piles under three typical seismic waves with different peak accelerations were studied.The results show that although the number of floors of substation distribution building is low,the roof still shows a certain amplification effect under the action of earthquake.The peak value of surface horizontal acceleration after considering the structure is generally higher than that of free site,and the horizontal acceleration response of surface within 30m from the structure is relatively large.The change of pile length in a certain range has little effect on the vibration response of superstructure.The peak value of the horizontal acceleration of the superstructure increases with the increase of the peak ground acceleration,and the extreme value of bending moment in the middle of the basement floor is not sensitive to the peak ground acceleration and different waveforms.

关 键 词：变电站 配电楼 地震反应 桩筏基础-地基-上部结构 地震强度 HSS模型 

分 类 号：TU473[建筑科学—结构工程]