双曲线冷却塔在多维地震下的区域易损性评价  

Partitioned seismic vulnerability assessment of hyperbolic cooling tower under multi-dimensional earthquakes

作　　者：周长东[1] 王朋国[1] 田苗旺 张许[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《哈尔滨工业大学学报》2017年第6期156-163,共8页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金面上项目(51478033;51678039)

摘　　要：为探讨某在役钢筋混凝土冷却塔结构不同部位的地震易损性,通过数值模拟进行分析.应用ABAQUS软件建立分析模型,根据结构所在场地选择一系列合理的地震动记录并对结构进行增量动力分析;选取了材料应变和地面峰值加速度作为结构地震需求参数和强度参数,将结构沿高度方向分为13个区域,并将结构的破坏状态划分为5个等级;在结构底部分别输入单向、水平双向和三向地震作用,对所得结构响应进行回归分析并建立概率地震需求模型,最终得到结构沿高度方向的区域易损性曲线.分析结果表明:上部塔筒的损伤概率较小,人字柱的损伤概率明显大于结构的其他部分;结构底部的人字支柱是结构的最薄弱部位,可根据需要对其进行加固,而塔筒的抗震性能优异.To explore the vulnerability of different part of a reinforced concrete cooling tower in service, numerical simulation analysis was carried out.The software ABAQUS was selected to establish analysis model.According to the field conditions where the structure locates in, a range of reasonable ground motion records were selected and then incremental dynamic analysis was conducted.Material strain and peak ground acceleration were selected as engineering demand and intensity measure parameters, respectively.The structure was divided into 13 regions in the height direction, and the damage states of the structure were divided into five levels.Unidirectional, bidirectional horizontal and three-dimensional seismic action were respectively exerted to the bottom of the structure, the regression analysis on the structure response was performed.The probabilistic seismic demand model of the structure was established, and the partitioned vulnerability curves of different parts were obtained.The analysis results show that： the damage probability of the upper tower is relatively small and the herringbone pillars＇ damage probability is significantly higher than the other parts of the structure.The herringbone pillars at the bottom are the most injury-prone part, which can be reinforced according to the actual needs, and the seismic performance of the upper tower is excellent.

关 键 词：钢筋混凝土冷却塔 增量动力分析 区域易损性 损伤指标 多维地震 

分 类 号：TU279.741[建筑科学—建筑设计及理论]