【摘要】 针对地震作用下桥梁结构梁体与横向挡块间的碰撞现象,采用非线性动力分析方法对影响碰撞效应的主要因素进行了系统研究。基于刚体碰撞理论,建立能考虑碰撞过程中能量损失的桥梁横向碰撞接触单元分析模型,研究了典型的浅源强震作用下挡块碰撞刚度、梁体与挡块间初始间隙、桥梁墩高以及跨径等因素对铁路RC简支梁桥地震碰撞效应的影响。研究表明抗震挡块对于防止横向落梁有显著的抑制作用,建议了铁路RC梁式桥抗震挡块的合理刚度及初始间隙取值,提炼了墩高及跨径对各项响应指标的影响规律。研究成果可供梁式桥抗震设计及规范修编参考。更多还原

【Abstract】 Aiming at the transverse pounding phenomenon between girder and retainer of girder bridges under earthquake excitation,the primary factors affecting pounding effects were studied systematically via nonlinear dynamical analysis.Based on the pounding theory of rigid body,the contact element model of transverse pounding which can take into account energy dissipation was established to discuss the influences of pounding stiffness,width of initial gap,pier height as well as beam span on pounding effects of railway RC girder bridges under typical shallow source earthquake.The results show the transverse seismic retainer is an effective measure to forefend beams from falling from piers.The rational values of pounding stiffness and initial gaps width were suggested,and the inflencing rules of pier height and beam span were essentialized.The research achievement can provide reference to the seismic design of girder bridge and the revision of seismic design codes.更多还原