摘要
为提升梁式桥的抗震性能,实现桥梁结构在地震作用下力学行为的可控性,基于减隔震设计原理,研发了一种功能可控型减隔震支座。通过数值模拟和模型试验研究了该支座的力学行为,结果表明:支座的滑动性能良好,摩擦行为稳定;剪力销力学行为可控,断后摩擦行为正常;环形钢阻尼元件滞回曲线饱满,耗能能力强;可控型支座整体力学行为稳定可控。最后以某3跨桥梁为例分析了可控型支座的减隔震效果,结果表明:合理选用可控型支座可以实现结构在地震作用下力学行为的可控性,使结构响应在力和位移之间取得较好的平衡,从而达到避免桥墩损伤破坏、防止落梁的目的。
In order to improve the seismic performance of girder bridges and realize the controllability of mechanical behavior of bridge structure under earthquake action,a functionally controllable seismic bearing was developed based on the design principle of seismic isolation,which has the functions of transforming bridge structure system,dissipating seismic energy and preventing beam falling.It plays different roles in different stress stages.The mechanical behavior of the controllable bearing was studied by numerical simulation and model test.The test results show that the sliding performance of the bearing is good and the friction behavior is stable,the mechanical behavior of shear pin is controllable and the friction behavior is normal after fracture,the hysteretic curve of ring steel damper is full and its energy dissipation capacity is strong,the whole mechanical behavior of the controllable bearing is stable and controllable.Finally,seismic isolation design and numerical calculation on an actual bridge were carried out,and the seismic isolation effect of the controllable bearing was analyzed.The calculation results show that reasonable selection of the controllable bearing can realize the controllability of the mechanical behavior of the structure under earthquake action,and make the structural response achieve a better balance between the force and displacement,so as to achieve the goal of avoiding pier damage and preventing beam falling.
作者
刘猛
王君杰
桂鉴臣
张兴
LIU Meng;WANG Junjie;GUI Jianchen;ZHANG Xing(College of Civil Engineering,Tongji University,Shanghai 200092,China;Hebei Baoli Engineering Equipment Group Co.,Ltd.,Hengshui 053000,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2021年第4期893-901,共9页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家重点研发计划(2018YFC1504306)
国家自然科学基金面上项目(52078384)资助
关键词
桥梁工程
减隔震装置
可控型减隔震支座
模型试验
滞回曲线
bridge engineering
seismic and isolation device
controllable seismic bearing
model test
hysteresis curve
