形心轴附加弯矩对四周布筋混凝土墩柱整体受力的分析  

Stress Analysis of Additional Moment of Center Axis on the Whole Reinforced Concrete Pier and Column

作　　者：王军[1] 刘少乾 苏文明[1] 郑罡[2] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《重庆交通大学学报（自然科学版）》2014年第2期10-14,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50878220;50308030);重庆市杰出青年科技基金项目(2008BA6039)

摘　　要：以基本的力学理论为基础,简化了四周布筋混凝土桥墩的受力模式,推导出墩身截面的力学平衡方程及力矩平衡方程;分析了在受地震作用过程中桥墩墩身开裂截面形心轴的偏移情况;应用形心轴附加弯矩的概念,分析了形心轴附加弯矩产生的原因及其对墩柱受力和整体刚度的影响。研究表明:在一定程度上,形心轴附加弯矩能够抵消墩柱的部分侧向变形,能够抑制截面开裂、减缓刚度退化。建议在结构抗震分析中应考虑形心轴的附加弯矩。According to the theory of the basic mechanics, the mechanical mode of the concrete column with reinforced a- round the section was predigested. The force balance equation and torque-equilibrium equation were presented by deriva- tion. The deviation of center axis in the crazing cross-section of the bridge pier in the course of earthquake was analyzed. The conception of the additional moment of center axis was adopted, and the cause of the additional moment of center axis and its influence on the mechanics and the whole stiffness of column were discussed. The results show that, in a certain sense, the additional moment of center axis could offset the horizontal deformation of column with reinforced around the cross-section; and could restrain the cross-section to crack and defer the degradation of stiffness. And it is recommended that the additional moment of center axis should be considered in the seismic analysis of the structure.

关 键 词：桥梁工程 形心轴附加弯矩 整体刚度 钢筋混凝土墩柱 

分 类 号：U441[建筑科学—桥梁与隧道工程] U443.22[交通运输工程—道路与铁道工程]