筒承式粮食立筒仓结构模态及地震反应分析  

Modal and earthquake response analysis of cylinder-supported grain silo structures

作　　者：许启铿[1,2] 王录民[1,2] 丁永刚[2] 

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]河南工业大学土木建筑学院,河南郑州450001

出　　处：《世界地震工程》2015年第3期55-61,共7页World Earthquake Engineering

基　　金：国家自然科学基金项目(51178164)

摘　　要：以某粮食储备库项目为背景,采用大型通用有限元软件MIDAS建立了筒承式钢筋混凝土粮食立筒单仓与群仓结构的分析模型。分别考虑空仓和满仓两种工况提取其各自前6阶振型和自振频率进行了模态分析和对比,进而分析了筒承式钢筋混凝土粮食立筒单仓与群仓结构在地震作用下的位移反应和应力反应。分析表明:群仓结构不是单仓的简单叠加,而是存在相互作用效应,不同筒仓数量与组合方式对其结构动力特性及地震反应有重要影响;仓内储料对立筒仓结构的自振频率等有重要影响,对于空仓和满仓工况应分别考虑计算;筒承式钢筋混凝土粮食立筒仓结构的质量和刚度沿高度方向分布比较均匀,其水平地震反应沿高度分布变化亦较均匀。The analysis models of cylinder-supported reinforced concrete grain silos, including a single silo and group silos, are set up through the finite element analysis software MIDAS according to the background of a practi- cal engineering project of grain reserve depot. The modal analysis of the models is carried out and compared under both empty condition and full condition, and the first six modes and frequencies are picked up. Then, the displace- ment response and stress response of cylinder-supported reinforced concrete silos under earthquake condition are an- alyzed. The analysis shows that group silos are not the simple add operation of each single silo, and they have the interaction effects. Different numbers and different combination patterns have an important influence on their dy- namic characteristics and earthquake response. The storage materials also affect the natural vibration frequency of the silo structure, which should calculat according to empty condition and full condition respectively. Since the mass and the rigidity are evenly distributed along the height direction, the horizontal earthquake response changes gradually from the bottom to the top.

关 键 词：筒承式粮食立筒仓 单仓 群仓 模态分析 地震反应 

分 类 号：TU317.1[建筑科学—结构工程] TU359