基于IDA方法的钢筋混凝土烟囱地震易损性分析  

Seismic Fragility Analysis of RC Chimneys Using IDA

作　　者：王思莹[1] 陈飞[2] 牛春良 王立成[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,116024 [2]中国电力工程顾问集团华东电力设计院有限公司,上海200063 [3]中冶东方工程技术有限公司(上海),201203

出　　处：《特种结构》2017年第3期102-108,共7页Special Structures

基　　金：中国电力工程顾问集团华东电力设计院有限公司资助项目"现行国家烟囱设计规范与国际标准差异性分析核验及相关修编建议研究"

摘　　要：建筑物在地震作用下发生倒塌是造成地震灾害的主要原因之一。基于增量动力分析方法,提出了适用于钢筋混凝土烟囱的IDA地震易损性分析方法,可以定量评估结构的抗震倒塌能力。以高度为120m的钢筋混凝土烟囱为例,通过0penSees软件建立数值仿真模型,研究了结构不同高度处截面曲率延性系数的最大值随地震强度的变化规律,确定了四个地震水准对应不同性能水平的超越概率。结果表明:该烟囱结构在8度多遇、设防和军遇地震作用下超过立即使用极限状态的概率分别为0%、0.17%和8.33%,结构处于完好或轻微破坏状态,符合抗震设计要求。在8度特大地震下超过立即使用极限状态的概率高达34.19%,抗震能力存在不足。One of the main earthquake disasters is structural collapse. In this paper, seismic fragility analysis of reinforced concrete （RC） chimneys using IDA was proposed. This method can quantitatively evaluate the collapse-resistant capacity of RC chimneys. Taking a 120-meter-high RC Chimney as a prototype structure, the model was established using the software OpenSees. The relations of maximum section curvature ductility factors at different heights to the increasing of seismic intensity were analyzed. The exceedance probabilities of four performance levels under four specified ground motion intensity levels were determined. It was shown that exceedance probabilities at Immediate Occupancy （IO） performance level, for frequent earthquake, basic earthquake and rare earthquake, are around 0%, 0. 17% and 8.33% respectively. The structure is in good to slightly damaged condition, and the chimney meets the seismic design requirements. However, the exceedance probability at IO performance level goes to as high as 34. 19%, indicating that inadequate insufficient seismic resistant capacity under very rare earthquake.

关 键 词：增量动力分析 地震易损性 钢筋混凝土烟囱 抗震性能 

分 类 号：TU352.11[建筑科学—结构工程] TU375