考虑SSI效应的高耸烟囱风振系数计算和风致响应分析  

Wind Vibration Coefficient Calculation and Wind-induced Response Analysis of Tall Chimney Considering SSI Effect

作　　者：曹孟辉 范存新[1] CAO Menghui;FAN Cunxin(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《江苏建筑》2024年第3期27-31,共5页Jiangsu Construction

摘　　要：为研究风荷载作用下考虑土-结构相互作用(Soil-structure Interaction,SSI)对高耸烟囱结构的影响,文章利用ABAQUS分别建立考虑与不考虑SSI效应的烟囱有限元模型,对两种工况下的模型进行结构动力特性分析,根据规范计算两种工况下的烟囱风振系数。通过对结构进行动力时程分析,比较不同刚度的地基土对烟囱结构的具体影响。结果表明:考虑SSI效应后,烟囱自振周期增大。高度越高,考虑SSI效应得到的烟囱风振系数与刚性地基时的风振系数相比偏差越大,在结构设计时考虑SSI效应可以更准确地计算风振系数。地基土刚度越小,烟囱上部结构的位移和加速度响应越大,在软土地基上的结构设计应当考虑SSI效应对高耸烟囱结构的不利影响。To study the effect of Soil-structure Interaction(SSI)on the structure of tall chimneys under wind load.In this paper,the chimney finite element model with and without SSI effect is established by ABAQUS,and the structural dynamic characteristics of the models under two working conditions are analyzed,and the chimney wind vibration coefficient under two working conditions is calculated according to the specification.Through the dynamic time history analysis of the structure,the concrete influences of different stiffness of foundation soil on the chimney structure are compared.The results show that the natural vibration period of chimney increases after SSI effect is taken into account.The higher the height is,the greater the deviation between the wind vibration coefficient of the chimney considering SSI effect and the wind vibration coefficient of the rigid foundation is.Considering SSI effect can calculate the wind vibration coefficient more accurately in the structural design.The smaller the foundation soil stiffness is,the greater the displacement and acceleration response of the chimney superstructure is.The SSI effect on the tall chimney structure should be considered in the structural design on soft soil foundation.

关 键 词：土-结构相互作用 高耸烟囱 风振系数 风致响应 

分 类 号：TU233[建筑科学—建筑设计及理论]