摘要
为了改善曲线PC箱梁桥的抗震性能,基于空间有限元法,采用非线性弹簧单元模拟铅芯橡胶支座,考虑了减隔震支座的非线性特性,以一座三跨曲线PC连续箱梁桥为例,分别对设置板式橡胶支座及铅芯橡胶支座的结构体系进行了非线性动力时程地震响应分析,并研究了铅芯橡胶支座在曲线梁桥中的减隔震效果。分析结果表明:铅芯橡胶支座具有很好的减隔震效果,能显著降低下部结构的地震响应值;多维地震荷载作用下,曲线箱梁桥的受力更为不利。
In order to improve seismic performance of curved box girder bridge, based on spatial finite element method, nonlinear spring element was used to simulate the lead-rubber bearing （LRB） considering its nonlinear properties. Taking a three-span curved PC box girder bridge as example, nonlinear time-history seismic response analyses were carried out respectively for bridge with plate rubber bearing and bridge with LRB structural systems. The effects of LRB in mitigating and isolating the seismic force for curved bridge were studied. The analysis results show that the LRB is quite effective as it can reduce the seismic response of substructures to great extent. Moreover, multi-dimensional earthquake excitation is more serious case for curved box girder bridge.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2008年第1期65-71,共7页
China Journal of Highway and Transport
基金
陕西省交通科学技术研究项目(03-01K)
关键词
桥梁工程
曲线箱梁
非线性分析
隔震体系
铅芯橡胶支座
bridge engineering
curved box girder
nonlinear analysis
seismic isolation system
lead-rubber bearing
