【摘要】 为了探究长周期地震动对水塔结构的破坏情况，以某钢筋混凝土水塔为原型，利用软件ABAQUS建立了有限元模型。根据傅里叶反应谱筛选出12条长周期地震动以及12条普通地震动，对水塔模型有孔洞方向和无孔洞方向进行了增量动力分析，以最大顶点位移为损伤指标，得到了水塔结构在不同地震作用下的易损性曲线以及不同破坏状态概率曲线，并在此基础上引入易损性指数曲线。研究结果表明，在计算水塔结构的地震易损性时应当以有孔洞方向为施加地震波的方向；长周期地震作用下得到的水塔破坏概率远大于普通地震作用下水塔的破坏概率；普通地震作用下结构基本满足三水准抗震设防要求，长周期地震作用下结构不能很好满足抗震要求，偏于不安全。所以在对水塔结构进行地震灾害风险概率评估时，长周期地震的影响不可忽视。更多还原

【Abstract】 In order to investigate the damage to the water tower structure by long-period ground montions,a finite element model was established in this paper using a reinforced concrete water tower as a prototype with the software ABAQUS. Based on the Fourier response spectrum,12 long-period ground motions and 12 ordinary ground montions were screened,and the incremental dynamic analysis was carried out for the direction with and without hole of water tower model. The damage index was taken as the maximum vertex displacement to obtain the susceptibility curves and different damage state probability curves of the water tower structure under different seismic effects, and the susceptibility index curves were introduced on this basis. The results show that the direction of the hole should be used as the direction of the applied seismic wave when calculating the seismic susceptibility of the water tower structure;the damage probability of the water tower under long-period ground motions is much larger than that of the water tower under normal ground montions; the structure basically meets the three-level seismic requirements under normal ground montions,but the structure does not meet the seismic requirements well under long-period ground montions and is on the unsafe side. Therefore,the impact of long-period ground motions cannot be ignored when assessing the seismic hazard risk probability of water tower structures.更多还原