钢筋混凝土双向压弯构件正截面承载力简化计算  

Simplified calculation of bending strength of biaxial compression-bending reinforced concrete column

作　　者：刘春阳[1] 王萌[1] 

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《山东建筑大学学报》2016年第5期452-457,共6页Journal of Shandong Jianzhu University

基　　金：山东省自然科学基金项目(ZR2015EQ017);山东建筑大学博士科研基金项目(XNBS1202)

摘　　要：框架柱双向压弯承载力不足是导致地震发生时结构严重破坏甚至倒塌的原因之一。文章基于截面等效的方法，在不改变截面面积、混凝土受压区面积以及截面等效前后对中和轴面积矩相等的条件下，得到框架柱双向压弯承载力计算用等效截面，同时基于平衡原理建立了双向压弯承载力简化计算方法，利用简化计算方法和等效梭形法对空间节点试验中框架柱的双向压弯承载力进行了计算，在保持配筋数量和截面几何参数不变的条件下考虑了纵筋分别向角筋偏移2倍钢筋直径、4倍钢筋植筋和与角筋紧密接触三种情况来探索提高截面双向压弯承载力的方法。结果表明：两种方法所得结果与试验实测值均符合较好，且简化方法计算精度较高，与试验实测值仅相差3％；随着纵筋向角筋的偏移，框架柱截面双向压弯承载力明显提高，提高幅度在14％～42％．Poor load carrying capacity of the reinforced concrete column under the biaxial compression-bending action is one of the reasons why the frame columns had been found damaged even collapsed during the earthquake. Without changing the section area, concrete compression zone area and the area moment to the neutral axis before and after the section equivalent conversion, based on the cross section equivalent method the equivalent section used for calculating the bearing capacity of the frame column under biaxial bending effect is found. Furthermore, the simplified calculation method on biaxial bending capacity of the frame column is established on the basis of equilibrium principle. The biaxial bending bearing capacity of the frame column of spatial joint is calculated by using the simplified method and the equivalent spindle section method. The calculation results and the experiment result show good agreement and the calculation accuracy of the simplified method is higher, the difference between them is only 3%. To improve the bearing capacity of biaxial bending section, the longitudinal steel bars are moved to the angle steel by 2, 4times steel bar diameter and closely contacted with the angle steel bar, respectively. The reinforcement quantity and the cross section bearing geometric parameters are unchanged. The calculation results show that the two-way bending capacity is enhanced obviously by degree of 14% -42%, with the moving of the steel bars to the angle steel. The research results could be good references to the practical engineering design works.

关 键 词：钢筋混凝土柱 双向压弯 承载力 简化计算 截面等效 

分 类 号：TU375[建筑科学—结构工程]