桥台-填土-结构相互作用对RC连续梁桥抗震性能的影响分析

发布时间：2018-11-11 00:22

【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。
[Abstract]:In order to study the effect of (ASSI) on seismic behavior of RC continuous beam bridge, the effects of backfill, pile foundation and abutment collision on abutment numerical model and the corresponding modeling method are discussed respectively. Taking a 5-span RC continuous beam bridge as an example, a nonlinear dynamic analysis model based on Open Sees platform is established. Considering the influence of passive earth pressure and active resistance on abutment, two nonlinear models of force-displacement of abutment are established, and the influence of different abutment models on dynamic response of bridge is analyzed. Finally, the influence of different backfill types on seismic demand of bridge structure is analyzed. The results show that considering bridge abutment fill structure system can significantly reduce the seismic demand of each member of bridge under strong earthquake and under the same seismic wave the calculation results of different backfill types of different platforms are quite different. It is suggested that in the future seismic design of bridges it is necessary to accurately explore the properties of fill behind abutments and consider the influence of abutment-soil-structure interaction on seismic performance of bridges.
【作者单位】：湖南大学土木工程学院;
【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)
【分类号】：U442.55

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