设置铅芯橡胶支座的多点约束结构体系在连崖结构中的应用研究
Research on the application of multipoint constrained structural system with lead rubber bearings in structure resting on cliff
乔帅斌1
作者信息
- 1. 甘肃省建筑设计研究院有限公司,甘肃兰州 730030
- 折叠
摘要
某观光电梯及连接栈桥项目属于连崖结构,采用多点约束的钢框架(支撑)-钢筋混凝土核心筒结构体系.多点约束模型在地震作用下基底剪力、变形特征等均与普通单点约束体系不同.通过对比研究固定铰支座和铅芯橡胶支座,发现采用铅芯橡胶支座后结构整体性能得到改善,支座和基础设计难度大大降低.通过施工模拟分析发现不同施工次序下结构内力及变形有一定差异,结构分析时应按照合理的施工次序加载,保证分析的准确性.另外,通过罕遇地震下的弹性时程分析,得到了铅芯橡胶支座的拉压应力及支座位移时程,均满足要求.最后,对结构进行罕遇地震下的动力弹塑性时程分析,分析结果表明,铅芯橡胶支座耗散了部分地震能量,结构整体损伤机制符合规范要求,具有较好的耗能能力,宏观上可满足抗震性能要求.
Abstract
A certain sightseeing elevator and connecting bridge project belongs to structure resting on cliff,which adopts a steel frame(support)reinforced concrete core tube structure system with multiple point constraints.Compared with the single point constraint model,the multi-point constraint model differs from the ordinary single point constraint system in terms of base shear force,deformation characteristics,etc.under earthquake action.By comparing and studying fixed hinge bearings and lead rubber bearings,it was found that the overall performance of the structure was improved after using lead rubber bearings,and the difficulty of bearing and foundation design was greatly reduced.Through construction simulation analysis,it was found that there are certain differences in the internal forces and deformations of the structure under different construction sequences.During structural analysis,reasonable construction sequences should be followed to ensure the accuracy of the analysis.In addition,through time history analysis under rare earthquakes,the tensile and compressive stresses and displacement time histories of lead rubber bearings were obtained,which meet the requirements.Finally,a dynamic elastic-plastic time history analysis was conducted on the structure under rare earthquakes.The analysis results show that the lead rubber bearings dissipate some seismic energy,and the overall damage mechanism of the structure meet the requirements of the specifications,with good energy dissipation capacity,and can meet the seismic performance requirements at the macro level.
关键词
多点约束结构体系/连崖结构/铅芯橡胶支座/施工次序/动力弹塑性时程分析Key words
multipoint constrained structural system/structure resting on cliff/lead rubber bearing/construction order/dynamic elastoplastic time history analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据