弱连体结构抗震设计方法在虹桥综合交通枢纽工程中的应用
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摘要
连体结构加剧了结构在地震作用下的受力复杂性,属不规则结构。以上海虹桥综合交通枢纽为工程背景,介绍了弱连体结构抗震设计方法在工程中的应用,并基于LS-DYNA程序开发了用于结构弹塑性时程分析的梁柱纤维单元,通过构件数值滞回加载与试验结果的比较,验证了梁柱纤维单元的适用性。采用多质点层模型进行粘滞阻尼器参数优化分析,并采用整体结构弹塑性模型进行罕遇地震作用计算,评价阻尼器参数设计的合理性和弱连体结构的抗震性能。分析结果表明:该工程弱连接设计是可行的,结构满足抗震性能要求。
Connected structure is one of irregular structures which result in complicated seismic design.As a case study of the Shanghai Hongqiao Communication Junction,the application of weakly connected structure is introduced,and a serious of beam-column fiber elements in elasto-plastic time history procedure are explored based on LS-DYNA as well as its applicability is verified by numerical cycle loading of members compared to experiments.Multiple-mass-point model is adopted for optimal design of viscous dampers,and then the global elasto-plastic time history analysis is carried out to further elevate the reasonability of viscous dampers and the seismic performance of weakly connected structure.The results show that the weakly connection design is qualified and the seismic performance objectives are satisfied.
Connected structure is one of irregular structures which result in complicated seismic design.As a case study of the Shanghai Hongqiao Communication Junction,the application of weakly connected structure is introduced,and a serious of beam-column fiber elements in elasto-plastic time history procedure are explored based on LS-DYNA as well as its applicability is verified by numerical cycle loading of members compared to experiments.Multiple-mass-point model is adopted for optimal design of viscous dampers,and then the global elasto-plastic time history analysis is carried out to further elevate the reasonability of viscous dampers and the seismic performance of weakly connected structure.The results show that the weakly connection design is qualified and the seismic performance objectives are satisfied.
引文
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