双筋矩形截面混凝土墩柱的开裂前沿简化计算  

Simplified Calculation of "Crack front" of Double Reinforced Concrete Rectangular Piers

作　　者：彭建中 叶永[2] 

机构地区：[1]东莞城建规划设计院,广东东莞400074 [2]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2011年第5期46-49,共4页Journal of China Three Gorges University：Natural Sciences

摘　　要：基于力学理论,对双筋矩形截面混凝土墩柱受力模式进行简化,建立模型的力学平衡方程,并分析墩柱模型的受力过程及开裂机理.运用"三段式"方法,在考虑混凝土受拉的条件下,求解墩柱开裂截面中性轴的位置,得到混凝土抗力ΔP(z)沿墩身分布的函数表达式.计算结果可适用于钢筋混凝土悬臂桥墩变形分析,提出的"三段式"分析方法可以求出墩柱各截面刚度以及墩柱墩顶位移曲线,有助于钢筋混凝土墩柱在复杂载荷作用下的开裂机理研究.According to the theory in basal mechanics,this thesis predigested the mechanical mode of the double reinforced rectangular concrete column,built the mechanical balance equation,and analysed stress process of the pier in theory.Under the condition that regarding concrete is being pulled,we should search the position of neutral axis of the cracking section by ＂three-phase＂ theory in order to get function expression of the concrete＇s resisting power along the length direction of the pier.These calculated results can be applied to the deformation analysis of the reinforced concrete cantilever bridge piers;and ＂three-phase＂ theory can be used to calculate stiffness of pier＇s each section;and the displacement of pier＇s top;and then be helped to do cracking mechanism of reinforced concrete piers under complex loads.

关 键 词：钢筋混凝土墩柱 开裂刚度 中性轴 应力-应变 

分 类 号：TU375.3[建筑科学—结构工程]