高速铁路桥墩等效塑性铰长度研究  

Study of Plastic Hinge Length in High-speed Railway Bridge Piers

作　　者：邵光强[1] 刘开[1] 蒋丽忠[2] 康俊涛[1] 

机构地区：[1]武汉理工大学,武汉430070 [2]中南大学,长沙410075

出　　处：《铁道工程学报》2017年第7期53-59,共7页Journal of Railway Engineering Society

基　　金：中国铁路总公司重大课题(2013G002A1);中央高校基本科研业务费专项资金项目(2017IVA027)

摘　　要：研究目的:等效塑性铰长度在墩柱的简化抗震设计中普遍用于预测墩顶的极限水平位移。高速铁路桥墩具有截面尺寸大、纵筋率较低等特点,目前我国铁路抗震设计规范未对桥墩的塑性铰长度给出建议值,设计人员只能参考现有的经验公式进行抗震设计,其适用性还不明确。本文基于9个高速铁路圆端形桥墩拟静力试验数据,对多个桥墩进行塑性铰长度的参数分析,与多种设计规范进行对比,旨在研究并提出适用于高铁桥墩的塑性铰长度公式,以方便桥墩抗震设计。研究结论:(1)利用纤维截面梁柱单元,采用修正Chang-Mander混凝土模型进行分析,与试验曲线吻合良好;(2)桥墩高度和轴压比对塑性铰长度影响较大,钢筋屈服强度与直径对其影响较小;(3)相比于已有的规范公式,本文提出的公式可更为准确地预测高铁桥墩的塑性铰长度;(4)该研究成果可用于高速铁路桥梁的抗震设计与分析。Research purposes： Equivalent plastic hinge length, Lp, is usually used to predict the limit displacements at the top of piers in simplified design under earthquake loading. High - speed railway bridge piers have larger section size and less longitudinal reinforcement ratio. At present, code for seismic design of railway engineering in China has no recommendations for the plastic hinge length of piers, engineers can only refer to the existing empirical formula for seismic design and its applicability is not clear. Based on the pseudo static test data of nine rounded type of high speed railway bridge piers, this paper analyzes the parameters of the plastic hinge length of multiple piers, compares with a variety of design specifications, aims to study and put forward the plastic hinge length formula suitable for high - speed railway bridge piers, for seismic design of bridge piers. Research conclusions： （ 1 ） The experimental results matched well with the modified Chang - Mander concrete model in the fibre beam - column element. （2） The pier height and axial compression ratio are the most influencing factors for the development of Lp, and the yield strength and diameter of steel rebar have less effect on Lp. （3） Compared to the existing design equations, the proposed equation predicted Lp in high - speed railway bridge piers well. （4） The research results can be applied to the seismic design and analysis in high- speed railway bridges.

关 键 词：高速铁路桥墩 等效塑性铰长度 纤维截面梁柱单元 单轴本构 

分 类 号：U24[交通运输工程—道路与铁道工程] U442.55[建筑科学—桥梁与隧道工程]