摘要
针对地震作用下多联长桥结构中伸缩缝处的碰撞破坏,用接触单元模拟桥墩两联间伸缩缝和桥台处伸缩缝在地震作用下的碰撞效应,建立了4个包含墩柱、主梁、支座和伸缩缝的曲线和直线全桥空间分析模型,分别输入2组地震波的8种地震动工况,进行非线性时程计算,研究桥台伸缩缝的设置与否对多联桥跨结构地震碰撞响应的影响,提出取消桥台伸缩缝的设置可有效消除或减小多联桥跨结构中伸缩缝处的地震碰撞破坏。
Aiming at pounding damage at expansion joint in a multi-unit （where one continuous girder is defined as one unit） long bridge under earthquake, the contact element is adopted to simulate the poun- ding response of expansion joints at the pier between two units or at the abutment. Four space dynamic models including a curved bridge and a straight one are built. In nonlinear time history analysis, eight types of seismic condition from two groups of seismic record are imported into the models. Finally the pounding response difference is analyzed in the condition that the abutment expansion joints are adopted or not in a multi-unit bridge structure. The simulation results indicate cancelling the abutment expansion joints of a multi-unit structure can eradicate or decrease pounding damage at expansion joint.
出处
《公路》
北大核心
2012年第3期20-25,共6页
Highway
基金
国家自然科学基金
项目编号51078306
高等学校博士学科点专项科研基金
项目编号20106120110004
西安建筑科技大学青年基金
项目编号QN0743
西安建筑科技大学重大科技创新基金
项目编号ZX0901
陕西省重点学科建设专项资金
项目编号E01004
关键词
多联桥跨结构
桥台处伸缩缝
桥墩处伸缩缝
非线性时程分析
地震碰撞响应
multi-unit bridge structure
expansion joint over abutment
expansion joint over pier
nonlinear time history analysis
seismic pounding response
