摘要
掉层框架结构存在严重的侧向刚度不规则和楼层承载力突变以及上接地层变形集中的问题,为改善山地掉层框架结构的层屈服破坏模式,该文对其附加底部铰接的摇摆墙,以期控制结构的屈服机制,以山地掉层框架-摇摆墙结构体系为研究对象,探讨SSI(Soil Structure Interaction)效应对山地掉层框架-摇摆墙结构抗震性能的影响规律。结果表明,不同地基条件以及不同摇摆墙刚度比的掉层框架-摇摆墙结构的动力响应特性不同,SSI效应对结构的上接地侧接地层及其上层的影响最大,加重了山地掉层框架结构因竖向刚度不均所导致的上接地层的层屈服机制。设置摇摆墙结构在考虑SSI效应时仍发挥优良的控制上接地侧变形均匀化的效果,SSI效应随摇摆墙布置位置和摇摆墙刚度比的变化而变化。SSI效应会改变掉层框架结构的滞回耗能模式,布置摇摆墙后,考虑SSI效应的山地掉层框架-摇摆墙结构薄弱层的滞回耗能减小,各层滞回耗能更加均匀,体现了摇摆墙控制整体变形的能力。
Irregular lateral stiffness,sudden change of floor bearing capacity and concentrated deformation of the upper ground layer are main problems for step-terrace frame structures in mountain cities.In order to improve the floor yield failure mode of the structure,the rocking wall hinged at the bottom was added to control the yield mechanism of the structure.Taking the step-terrace frame-rocking wall structure system as the research object,the influence law of SSI effect on the seismic performance of the step-terrace frame-rocking wall structure system was discussed.The results show that the dynamic response characteristics of the step-terrace frame-rocking wall structure system with dfferent foundation conditions and different rocking wall stiffness ratio are different.The SSI effect most influences the upper grounding layer of the structure and its upper layer,changing the layer yield mechanism of the upper grounding layer due to the uneven vertical stiffness of the step-terrace frame structure.When considering the SSI effect,the rocking wall structure still plays important role in controlling the deformation homogenization of the upper grounding side.The SSI effect changes with the layout position of the rocking wall and the stiffness ratio of the rocking wall and the hysteretic energy consumption mode of the step-terrace frame structure.After the rocking wall is arranged,the hysteretic energy consumption of the weak layer of the step-terrace frame-rocking wall structure system considering SSI effect wll be reduced.The hysteretic energy consumption of each layer is more uniform,which reflects the role of the rocking wall in controlling the overall deformation.
作者
杨佑发
金鸿慎
刘议蓬
Yang Youfa;Jin Hongshen;Liu Yipeng(Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education,Chongqing University,Chongqing 400045,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第7期1-11,共11页
China Civil Engineering Journal
关键词
SSI效应
掉层框架-摇摆墙结构
抗震性能
层屈服机制
整体变形能力
SSI
step-terrace frame-rocking wall structure
seismic response characteristics
floor yield failure mechanism
ability of overall deformation
