基于变形能力的钢筋混凝土桥墩约束箍筋用量评价

发布时间：2018-04-01 07:03

本文选题：钢筋混凝土桥墩　切入点：约束箍筋　出处：《桥梁建设》2014年06期

【摘要】：针对地震作用下钢筋混凝土桥墩的变形能力要求,研究桥墩潜在塑性铰区约束箍筋的用量问题。借助美国PEER柱抗震性能试验数据库,整理了35根弯剪破坏墩柱的拟静力试验数据,通过统计分析评价我国桥梁抗震设计原《公路工程抗震设计规范》(JTJ 004-89)和现行《公路桥梁抗震设计细则》(JTG/T B02-01-2008)中最低约束箍筋用量对保证桥墩变形能力的可靠性,并与美国、欧洲主要桥梁抗震设计规范进行对比,之后建立了具有85%保证率的弯剪破坏桥墩极限位移角计算公式。研究结果表明:以2%桥墩极限位移角为评价目标,现行《公路桥梁抗震设计细则》满足桥墩变形能力要求;而以3%桥墩极限位移角为评价目标,该规范配箍要求略偏于不安全,在高地震危险区桥墩抗震设计时应予以注意。
[Abstract]:According to the deformation capacity requirement of reinforced concrete pier under earthquake, the problem of the amount of confined stirrups in the potential plastic hinge region of bridge pier is studied. The pseudostatic test data of 35 flexural shear failure columns were collected. Through statistical analysis and evaluation of the reliability of the minimum amount of stirrups in the original "Code for Seismic Design of Highway Engineering" (JTJ004-89) and the current "rules for Seismic Design of Highway Bridges" (JTG / T B02-01-2008) to ensure the deformation capacity of bridge piers, Compared with the code for seismic design of main bridges in Europe, a formula for calculating the ultimate displacement angle of pier with 85% guarantee rate is established. The results show that the limit displacement angle of 2% bridge pier is regarded as the evaluation target. The present detailed rules for Seismic Design of Highway Bridges meet the requirements of deformation capacity of piers, but with the limit displacement angle of 3% piers as the evaluation target, the requirement of hoop in this code is slightly less safe, and attention should be paid to the seismic design of piers in high seismic risk areas.
【作者单位】：华北水利水电大学水利学院;大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金青年基金项目(51408223);国家自然科学基金项目(51178071,51008041) 教育部新世纪优秀人才支持计划资助项目(NCET-12-0751) 辽宁省高等学校优秀人才资助计划(LJQ2013053)~~
【分类号】：U443.22

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