考虑下部结构单层球面网壳的地震动参数与易损性分析  

Ground motion parameters and fragility analysis for single-layer reticulated domes supported by substructures

作　　者：韩庆华[1,2,3] 孙明阳 徐杰[1,2,3] HAN Qinghua;SUN Mingyang;XU Jie(Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学中国地震局地震工程综合模拟与城乡抗震韧性重点实验室,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300350 [3]天津大学建筑工程学院,天津300350

出　　处：《地震工程与工程振动》2024年第3期29-40,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金联合基金项目(U1939208);高等学校学科创新引智计划资助(111计划-B20039)。

摘　　要：目前大跨空间球面网壳结构的地震动参数研究与易损性分析多关注于上部结构,忽视了下部支承体系对整体结构的影响。为选取适于评估带下部结构肋环斜杆型单层球面网壳响应的地震动参数,以6个不同矢跨比、不同下部结构的单层球面网壳为模型,研究下部支承体系对球面网壳动力特性的影响,选取多条三维地震动作为输入对模型进行增量动力分析,从相关性、有效性和充分性三个方面对18个地震动参数进行分析评估。并基于大量算例失效时刻的特征响应,建立了考虑下部结构的单层球面网壳的地震损伤模型。结果表明:有无下部支承对结构基频影响较大,随着下部结构高度的增加,结构基频不断减小,无支承柱结构与带10 m支承柱结构的基频相差高达24%;加速度谱强度、峰值加速度与结构地震响应的相关性、有效性及充分性均优于其它地震动参数,可作为考虑下部结构肋环斜杆型单层球面网壳易损性分析的地震动参数。与此同时,在下部支承结构相同时,矢跨比小的网壳结构抗震性能更好,所致结构倒塌的临界荷载更大;支承高度对网壳抗震性能的影响并非呈线性关系,因此,在结构设计时应合理选取下部支承结构高度。The current research on ground motion parameters and fragility analysis of large-span spatial reticulated domes mostly focuses on the superstructure,ignoring the influence of the substructures on the overall structure.In order to select the ground motion parameters suitable for evaluating the response of schwedler single-layer reticulated domes supported by substructure,six single-layer reticulated domes with different rise-span ratios and different substructures were designed.Then,the dynamic characteristics of the reticulated domes supported by substructure are analyzed.After that,incremental dynamic analyses were carried out for reticulated domes supported by substructure on multiple three-dimensional ground motion records.Based on incremental dynamic analysis data,eighteen ground motion parameters are analyzed and evaluated in terms of correlation,efficiency,and sufficiency.Based on characteristic responses at failure state of a large number of arithmetic cases,the seismic damage model of single-layer reticulated domes supported by substructure was established.The results show that the presence or absence of the substructure has a greater influence on the structural fundamental frequency,and the structural fundamental frequency decreases as the stiffness of the substructure decreases.The difference between the fundamental frequency of the structure without support column and the structure with 10-meter support column is as high as 24%.The acceleration spectrum intensity and PGA are more strongly correlated to the seismic responses of reticulated domes supported by substructure,and the efficiency and sufficiency are better than other ground motion parameters,which can be used as ground motion parameters for fragility analysis of schwedler single-layer reticulated domes supported by substructure.At the same time,when the height of substructure is the same,the seismic performance of the reticulated dome structure with small rise-span ratio is better,and the critical load due to the collapse of the structure is g

关 键 词：下部结构 肋环斜杆型 球面网壳 地震动参数 损伤模型 易损性分析 

分 类 号：TU393.3[建筑科学—结构工程]