高速铁路HRBF500钢筋混凝土圆端形桥墩抗震性能试验研究

发布时间：2018-01-05 19:12

本文关键词：高速铁路HRBF500钢筋混凝土圆端形桥墩抗震性能试验研究　出处：《东南大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

【摘要】：为了研究纵筋采用500 MPa级细晶粒钢筋的高速铁路圆端形桥墩的抗震性能,对4个配置HRBF500钢筋和1个配置HRB335钢筋的圆端形桥墩试件进行了拟静力试验.试验参数主要包括纵筋强度、轴压比、配筋率和箍筋加密区的拉筋数量.试验结果表明:配置HRBF500钢筋的圆端形桥墩抗震性能变化规律与配置HRB335钢筋的圆端形桥墩基本相同;配置HRBF500钢筋可以显著减少桥墩纵向钢筋的用量,提高桥墩的承载力并具有良好的抗震延性;增加轴压比或提高配筋率均可提高桥墩的承载力,但同时也会减小其变形能力;在墩底箍筋加密区增加拉筋的数量可明显提高桥墩的延性.研究表明,配置HRBF500钢筋的圆端形桥墩具有良好的抗震性能,可在高速铁路工程中安全应用.
[Abstract]:In order to study the seismic behavior of round end pier of high-speed railway with 500 MPa grade fine grain steel bar used in longitudinal reinforcement. Quasi static tests were carried out on four specimens of round end pier with HRBF500 reinforcement and one with HRB335 reinforcement. The test parameters mainly include longitudinal reinforcement strength and axial compression ratio. The experimental results show that the seismic behavior of circular end pier with HRBF500 reinforcement is basically the same as that of round end pier with HRB335 reinforcement. HRBF500 reinforcement can significantly reduce the amount of longitudinal reinforcement of pier, improve the bearing capacity of pier and have good seismic ductility. Increasing the axial compression ratio or the reinforcement ratio can increase the bearing capacity of the pier, but at the same time, it will reduce the deformation capacity of the pier. The ductility of bridge piers can be obviously improved by increasing the number of tension bars in the infilled zone of stirrups at the bottom of the pier. The research shows that the round end pier with HRBF500 reinforcement has good seismic performance. It can be used safely in high speed railway engineering.
【作者单位】：东南大学土木工程学院;东南大学建筑设计研究院有限公司;
【基金】：国家高技术研究发展计划(863计划)资助项目(2008AA030704)
【分类号】：U442.55
【正文快照】： 我国高速铁路建设中桥梁的比例很大,平均在50%以上,个别线路超过90%[1].作为高速铁路桥梁的支撑结构,桥墩必须要具有较高的抗震性能.目前,我国高速铁路钢筋混凝土桥墩的纵筋普遍采用HRB335钢筋,而发达国家主要使用屈服强度400 MPa以上的高强钢筋[2].提高钢筋强度可节约钢材用

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