圆形钢筋混凝土桥墩等效塑性铰长度

发布时间：2018-05-19 00:26

本文选题：钢筋混凝土桥墩 + 塑性铰长度　；参考：《土木工程学报》2016年02期

【摘要】：基于桥墩极限位移三分量模型,从弯曲、剪切和纵筋滑移变形等三方面分析了桥墩塑性铰长度的主要影响参数;通过40个圆形钢筋混凝土桥墩试验数据的分析,建议了桥墩塑性铰长度的理论公式及经验公式;并对建议及各规范的塑性铰长度公式进行了模型桥墩、足尺桥墩和实桥桥墩的验证。结果表明:钢筋混凝土桥墩塑性铰长度主要随墩高、截面高度、材料特性参数(fydb/fc')及纵筋率的增大而增大,与轴压比、配箍率等关系不大;与试验结果相比,就平均意义而言,各国规范塑性铰长度计算结果偏于安全,但均有较大的离散性,日本JRA规范最为保守,中国《公路桥梁抗震设计细则》(JTG/T B02-01—2008)较美国Caltrans规范及欧洲Eurocode8规范保守;建议的塑性铰长度理论公式与日本JRA规范相当,建议的塑性铰长度经验公式在平均意义上与美国Caltrans规范及欧洲Eurocode8规范一致,但具有较小的变异系数和较高的保证率,优于其他公式。
[Abstract]:Based on the three-component model of ultimate displacement of bridge pier, the main parameters influencing the length of plastic hinge of pier are analyzed from three aspects of bending, shear and slip deformation of longitudinal reinforcement, and the experimental data of 40 circular reinforced concrete piers are analyzed. The theoretical and empirical formulas for the length of plastic hinge of piers are suggested, and the model piers, full-scale piers and solid bridge piers are verified. The results show that the length of plastic hinge of reinforced concrete pier increases with the increase of pier height, cross-section height, material characteristic parameter and longitudinal reinforcement ratio, and has little relation with axial compression ratio and hoop ratio. The calculation results of plastic hinge length in various countries are on the side of safety, but they all have greater discreteness. The Japanese JRA code is the most conservative, and China's "detailed rules for Seismic Design of Highway Bridges" (JTG / T B02-01-2008) is more conservative than the American Caltrans Code and the European Eurocode8 Code. The proposed theoretical formula of plastic hinge length is equivalent to that of the Japanese JRA code. The suggested empirical formula of plastic hinge length is consistent with the American Caltrans Code and the European Eurocode8 Code in average sense, but has a smaller coefficient of variation and a higher guarantee rate. It is superior to other formulas.
【作者单位】：广西壮族自治区交通规划勘察设计研究院;招商局重庆交通科研设计院有限公司桥梁结构动力学国家重点实验室;重庆交通大学;
【基金】：国家自然科学基金(NSFC;51478072) 国家国际科技合作专项(2011DFA83300)
【分类号】：U443.22;U442.55

【相似文献】