摘要
为了研究在不同强度地震作用下多跨连续隔震桥梁的动力特性以及铅芯支座的隔震效果,按1/20的比例设计了一座六跨连续隔震梁桥模型及试验用铅芯橡胶支座,在此基础上进行振动台试验。采用有限元软件SAP2000建立了振动台试验模型进行分析,将数值分析与振动台试验结果进行对比,误差在可接受范围,验证了有限元模型的正确性。试验和计算结果都表明:隔震后的桥梁的周期会显著增加,桥墩顶部和桥面的加速度响应以及桥墩底部的剪力、弯矩都有大幅度下降,且隔震的支座参数直接影响到桥墩底部的受力的大小;铅芯支座的耗能效果良好,可以较多地耗散地震输入能量,阻止能量向桥梁上部结构的传递,隔震后桥梁上部结构的位移较大,但在铅芯支座可控制范围。
In order to investigate dynamic properties and isolated effect of the multi-span continuous isolated bridges under excitations with different earthquake intensities, a 1/20 isolated bridge model consisting of six-span continu- ous deck and rubber bearing using in test were designed, based on it, simulating shaking table test was carried out. The error of comparison between numerical analysis by finite element software SAP2000 and shaking table test was within acceptable limits. Results show that the period of bridge with isolation increases significantly. The accelera- tion responses of pier caps and deck, and the shear force and the bending moment of pier bottom are decreased dra- matically. Much earthquake energy is dissipated and the energy transmitted to the upper part of bridge can be re- duced. The displacement of bridge superstructures is larger after isolation but it is in the control range.
出处
《地震工程与工程振动》
CSCD
北大核心
2014年第1期217-223,共7页
Earthquake Engineering and Engineering Dynamics
基金
国家重点基础研究发展计划"973计划"(2012CB723304)
国家科技支撑计划子课题(2012BAJ07B02)
关键词
隔震桥梁
振动台试验
铅芯支座
隔震效果
耗能
isolated bridge
shaking table test
rubber bearing
isolation effect
energy dissipating
