纵向地震下高速铁路桥梁圆端型实体墩塑性铰长度研究

以纵向地震下高速铁路桥梁圆端型实体墩为工程背景,将桥墩置于全桥体系中,利用弯矩曲率关系程序和有限元软件对桥梁进行弹塑性分析计算,得出不同墩高、不同车速以及不同地震作用组合工况下的高速铁路桥墩塑性铰长度,并与既有试验结果以及各国桥梁抗震设计规范塑性铰长度计算公式相对比。计算结果表明：在设计纵向配筋率、体积含箍率、剪跨比、轴压比下的塑性铰长度经过修正可以满足要求,提出了适合铁路桥梁圆端型墩的塑性铰长度建议计算公式,为高铁桥梁设计提供参考。

Research on the length of plastic hinge in high-speed bridge with round-ended solid pier subjected to longitudinal earthquake

Based on the high-speed bridge with round-ended solid piers subjected to longitudinal seismic effect,the piers were put into a vehicle-bridge system,and moment-curvature relationship program and finite element software were employed to analyze elastic-plastic responses of the high-speed bridge. Then the plastic hinge length of the high-speed bridge under different kinds of pier height,speed and earthquake load combination was derived,which was compared with the previous experimental results and bridge seismic design codes of different countries. The calculation results show that the plastic hinge length formula can be utilized after that the previous formula is revised at the condition of designed longitudinal reinforcement ratio,volumetric lateral steel ratio,shear span ratio as well as axial compression ratio,and the computing formula of the plastic hinge length was proposed which is suitable for high-speed bridge with round-ended piers,which can provide reference for design of the high-speed railway bridge.