【摘要】 针对地震作用下钢筋混凝土桥墩塑性铰区剪切破坏模式,研究了抗剪强度计算问题。进行了12根钢筋混凝土短柱桥墩拟静力试验,在试验基础上比较了各国主要桥梁抗震设计规范中的桥墩抗剪强度计算公式。辅以太平洋地震工程研究中心(PEER)钢筋混凝土柱拟静力试验数据库,对地震作用下塑性铰区混凝土抗剪强度影响因素进行了统计分析,最后参考相关规范及研究成果提出了桥墩塑性铰区抗剪强度计算公式。结果表明:满足中国现行桥梁抗震设计规范最低配箍要求的钢筋混凝土短柱桥墩仍有很大可能发生塑性铰区的剪切破坏,宜引起足够重视。更多还原

【Abstract】 Aimed at problem of brittle shear failure occurred in the plastic hinge zone of reinforced concrete bridge columns under seismic effect,the shear strength of the column were studied.The pseudo-static tests of 12 reinforced concrete short bridge column were conducted.Existing calculated equations for shear strength of the bridge column around the world were also compared with each other based on experimental results.Using pseudo-static test database of PEER reinforced concrete column,statistical analysis for influencing factor of concrete shear strength in plastic hinge zone under seismic effect was carried out.Finally,according to relative code and research outcome,a calculated equation for shear strength of bridge column in the plastic hinge zone was proposed.Results show that the short bridge columns satisfied with minimum stirrup ratios of current seismic design code in China may suffer shear failure in plastic hinge zone which should pay more attention in the design.更多还原