摘要
本文以某地铁车站-高架桥一体化设计项目为背景,基于桥梁有限元软件Midas/Civil,分别建立地铁车站与桥梁的刚接模型与铰接模型,对比分析不同连接方式下站桥结构的动力特性以及在地震激励下的内力响应,并对铰接模型中垫层厚度的选取提出合理化建议。分析结果表明,与站桥刚接模型相比,铰接模型结构基频偏小,振动模态存在明显差异,地震作用下,桥梁墩柱与车站立柱的弯矩和剪力减小至0.6倍左右,对处于高烈度区域的桥梁跨径较大的站桥合建工程,站桥铰接的连接方式更加适用。站桥铰接模型随垫层厚度的增加,隔震效果更加理想,桥梁墩柱与车站横梁的受力状态均得到改善,但垫层厚度在考虑开挖深度等增加施工难度的影响后不宜过高。
Based on an integrated station-bridge structure,the rigid connection model and hinge joint model of the subway station and bridge were simulated by Midas/Civil.The dynamic characteristics and the seismic behaviors of the station-bridge structure models were compared with different connection modes.Then,reasonable suggestions on the selection of cushion thickness were proposed.The results showed that the fundamental frequency of the hinge joint model was smaller than the rigid connection model,and two models displayed obvious different vibration modals.Under the earthquake action,the bending moment and shear force of bridge column and subway station column were reduced to about 0.6 times.So,the hinge joint mode is more suitable for the integrated station-bridge structure with large span bridge in high earthquake intensity areas.With the increase of cushion thickness,seismic isolation of station-bridge structure with hinge joint model is more effective,and the stress of bridge column and station beam is more moderate.Considering the influence of construction difficulty,such as excavation depth,the cushion should not be too thick.
作者
苏士才
秦永刚
刘能文
Su Shicail;Qin Yonggang;Liu Nengwen(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,100082,China;Beijing Engineering Research Center of Urban Bridge Security,100082,China)
出处
《特种结构》
2023年第6期69-73,共5页
Special Structures
关键词
站桥一体化结构
动力特性
时程分析
抗震性能
垫层厚度
Integrated station-bridge structure
Dynamic characteristics
Time-history analysis
Seismic performance
Cushion thickness
