摘要
以往的结构地震易损性分析一般是针对结构自身特性进行分析,很少结合研究区域的工程场地的差异性,忽略了城市内不同工程场地的位置差异性,因此,以成都市为研究区域,以三层钢筋混凝土框架结构为例,提出基于峰值加速度(peak ground acceleration,PGA)和结构最大层间位移角θ_(max)的钢筋混凝土框架结构地震易损性分析方法。针对三层钢筋混凝土框架结构,该方法利用层间剪切模型进行动力时程分析,求得各地震响应下的θ_(max),再对θ_(max)及其相对应的地震动进行对数线性拟合得到两者的关系式;针对成都市区域,该方法以成都市历史地震动资料为数据基础,结合PGA计算公式,得到成都市各个工程场地位置的PGA。进而,以最大层间位移角为结构损伤指标,以PGA为地震动强度指标,研究结构在充分运行、基本运行、生命安全和接近倒塌4个不同性能水准下的结构失效概率最高分别为94.1%、89.1%、74.7%和40.8%,且结构各性能水准的结构失效概率的总体变化趋势都是由西部向东部递减,因此可以适当加强西部地区结构的抗震构造要求,适当放宽东部地区的结构的抗震构造要求,以便节约经济成本。所提出的方法对降低地震灾害损失具有一定的应用价值,为建筑结构的抗震设计提供一定的理论依据。
The previous structural seismic vulnerability analysis is generally based on the characteristics of the structure itself,it is rare to combine with the differences of engineering sites in the study area,the location differences of different engineering sites within the city are ignored.Taking Chengdu City as the research area and the three-story reinforced concrete frame structure as an example,an analysis method for the seismic vulnerability of reinforced concrete frame structures based on peak ground acceleration(PGA)and the maximum inter-story displacement angleθ_(max) of the structure was proposed.For three-story reinforced concrete frame structures,this method conducts dynamic time-history analysis using the interlayer shear model to obtainθ_(max) under each seismic response.Then,logarithmic linear fitting is performed onθ_(max) and its corresponding ground motion to obtain the relationship between the two.For the Chengdu area,this method takes the historical ground motion data of Chengdu as the data basis and combines PGA calculation formula to obtain the PGA of each engineering site location in Chengdu.Furthermore,taking the maximum inter-layer displacement angle as the structural damage index and PGA as the ground motion intensity index,the highest structural failure probabilities of the structure under four different performance levels of full operation,basic operation,life safety and near collapse were studied,which were 94.1%,89.1%,74.7%and 40.8%respectively.Moreover,the overall changing trend of the structural failure probability at each performance level of the structure decreases from the west to the east.Therefore,the seismic construction requirements for structures in the western region can be appropriately strengthened,and those for structures in the eastern region can be appropriately relaxed,so as to save economic costs.The proposed method has certain application value in reducing the losses caused by earthquakes and provides a certain theoretical basis for the seismic design of building structures.
作者
昌毅
杨仁镪
杨子健
李革新
CHANG Yi;YANG Ren-qiang;YANG Zi-jian;LI Ge-xin(School of Civil&Architectural Engineering,East China University of Technology,Nanchang 330013,China;Department of Environmental Engineering and Architecture,Nagoya University,Nagoya 4648603,Japan;CCCC Third Harbor Engineering Bureau Hunan Branch Co.,Ltd.,Zhuzhou 412000,China)
出处
《科学技术与工程》
北大核心
2025年第21期9043-9051,共9页
Science Technology and Engineering
基金
国家自然科学基金(52268020)
中国国家留学基金(202308360115)
中交第三航务工程局有限公司资助项目(2024-三峡锚建综-027)。
关键词
峰值加速度
最大层间位移角
钢筋混凝土框架结构
结构失效概率
网格化
地震易损性分析
peak ground acceleration
maximum inter-story displacement angle
reinforced concrete frame structure
probability of structural failure
gridding
seismic vulnerability analysis
