摘要
为研究桥台-填土-结构相互作用(ASSI)对RC连续梁桥梁抗震性能的影响,分别探讨了台后填土、桩基和桥台处碰撞等在桥台数值模型中的作用以及相应的建模方法。以某5跨RC连续梁桥为例,基于Open Sees平台建立了非线性动力分析模型。考虑被动土压力和主动抵抗力对桥台的影响,建立了两种桥台力-位移非线性模型,分析了不同桥台模型对桥梁动力响应的影响。最后考虑了不同的台后填土类型,分析其对桥梁结构地震需求的影响。分析结果表明,考虑桥台-填土-结构体系会显著降低强震作用下桥梁各构件的地震需求;在同一地震波激励下,不同台后填土类型的计算结果相差十分明显。建议在以后桥梁的抗震设计中,有必要准确勘探桥台背后填土的性质,并考虑桥台-填土-结构相互作用对桥梁抗震性能的影响。
In order to study the influences of the abutment-soil-structure interaction （ASSI） on seismic performance of RC continuous girder bridge, the role of the backfill soils, pile foundation, and the pounding effects in the abut- ments numerical models and the corresponding modeling method were discussed, respectively. A five spans RC continuous girder bridge was taken as an example and the nonlinear dynamic analysis model was built by using the OpenSees source program. In this paper, two force-displacement nonlinear models of the abutment were implemen- ted to account for the influence of passive earth pressure and active resistance on the abutment. Then, the influ- ences of different abutment models on dynamic responses of the bridge were analyzed. Finally, the influences of va- rious backfill soils on bridge seismic demands were analyzed. The results show that the seismic demands of bridge structural components under strong earthquake can be decreased effectively by considering the abutment-soil-struc- ture interaction. The calculation results of different soil types differ obviously under the same seismic excitation. Therefore, it is suggested that the properties of the backfill soils are necessarily explored accurately and the influ- ence of abutment-soil-structure interaction on the seismic performance of the bridge should be considered in the seismic design of bridges.
出处
《世界地震工程》
CSCD
北大核心
2017年第2期71-79,共9页
World Earthquake Engineering
基金
国家自然科学基金资助项目(51278183)
湖南省研究生科研创新项目(CX2013B159)
关键词
桥梁工程
地震
桥台
填土
地震响应
bridge engineering
earthquake
abutment
backfill soil
seismic response
