形心轴附加弯矩对墩柱整体受力的初步分析  

Primary analysis on the effect of the additional moment of center axis on the whole mechanical behaviour of a column

作　　者：高波[1,2] 苗宇[3] 李贵乾[1,2] 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 [3]四川省交通厅公路规划勘察设计研究院,四川成都610072

出　　处：《世界地震工程》2011年第2期129-134,共6页World Earthquake Engineering

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(CSTC;2008BA6039);交通部西部交通建设科技项目(200731882233)

摘　　要：文中以基本的力学理论为依据,对双筋矩形截面混凝土墩柱受力模式进行简化,通过力学平衡方程,从理论上分析了墩柱受力过程中开裂区域形心轴的偏移情况。在此基础上,引入了轴力对形心轴附加弯矩的概念,并初步探讨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。分析结果表明,形心轴附加弯矩对墩柱侧向变形具有一定的消减作用,能够有效地抑制截面开裂、减缓刚度退化,因此在结构抗震分析中,建设对形心轴附加弯矩作用予以考虑。According to the theory of the fundamental mechanics,the mechanical mode of the bi-reinforced rectangular of concrete column is simplified,the locomotive displacement of its center axis in the cracking zone is analysed by the equation of mechanics.On the base of the analysis,the additional moment of center axis is introduced,the reason of the occurring moment is discussed and the effect of the moment on the mechanical behaviour and the stiffness of column is analysed.It is indicated that the additional moment can decrease the horizontal deformation of the column,restraine the cross section to be cracked and slow down the degradation of stiffness.So it should be considered in the seismic analysis.

关 键 词：钢筋混凝土墩柱 开裂 形心轴附加弯矩 整体刚度 

分 类 号：TU352[建筑科学—结构工程] O341[理学—固体力学]