摘要
为研究大跨异形钢连廊连体结构的地震易损性,以某实际工程为研究背景,首先分别定义连体结构中的框架剪力墙结构、橡胶支座端和预埋锚固端的极限状态与损伤指标,并采用有限元软件SAP2000建立分析模型。其次,根据结构所在的场地条件,选取了24条地震动记录,并对结构进行三向地震激励下的增量动力分析。在此基础上,以最大层间位移角、橡胶支座的剪切应变和预埋锚固端的损伤因子作为结构地震需求参数,以地面峰值加速度作为地震动强度参数,根据增量动力分析的结果,得到大跨异形钢连廊连体结构的地震易损性曲线。最后,采用振动台试验对易损性分析结果进行验证。结果表明:在8度罕遇地震时,主楼、附楼I、橡胶支座端及角钢预埋锚固端发生毁坏的超越概率分别为0.8%、0.3%、0及47.7%,整体结构发生毁坏的超越概率上界为48.4%,下界为47.7%。这说明用局部结构的地震易损性来评价整体结构的地震易损性是偏于不安全的。易损性分析结果也显示连体结构易发生损坏的部位依次是预埋锚固端、主楼、附楼I和橡胶支座端,这与振动台试验结果相同。建议在设计中加强连体结构的锚固端,保证其可靠连接。
In order to study the seismic fragility of the connected structure with large span special-shaped steel corridor,a practical project was taken as the research object.Firstly,the damage measure and limit state of the frame-shear wall structure,rubber bearing and angel steel embedded parts were defined respectively based on the analytical model established by SAP2000.Then,the incremental dynamic analysis(IDA)were carried out under three-dimensional seismic excitation using 24 ground motion records selected according to the site conditions of the structure.Based on the IDA results,the seismic fragility curves were obtained with the maximum inter-story drift ratio,the shear strain and the damage factor as the structure demand parameters and peak ground acceleration as the intensity measure.The results of fragility analysis were also verified by the shaking table test.The research results show that under the rare intensity level of degree 8,the damage probability of main building,affiliated building I,rubber bearing and angel steel embedded parts are 0.8%,0.3%,0.0%and 47.7%respectively.The upper and lower bound of the damage probability for the overall structure was 48.4%and 47.7%respectively.Therefore,it is unsafe to use the seismic fragility of local structures to evaluate the seismic fragility of overall structure.The most vulnerable local structures of the connected structure are in turn the embedded parts,the main building,the affiliated building I and the rubber bearing.Therefore,it is suggested to strengthen the embedded structures so as to ensure its reliable connection.
作者
潘毅
胡思远
赵崇锦
李晰
Pan Yi;Hu Siyuan;Zhao Chongjin;Li Xi(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of Seismic Engineering of Sichuan Province,Southwest Jiaotong University,Chengdu 610031,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第2期12-22,61,共12页
China Civil Engineering Journal
基金
国家重点研发计划(2016YFC0802205)
科技部资助项目(KY201801005).
关键词
大跨异形钢连廊
连接结构
地震易损性
损伤指标
增量动力分析
large span special-shaped steel corridor
connected structure
seismic fragility
damage measure
incremental dynamic analysis
