钢筋混凝土框架异型中节点抗裂度计算  

CALCULATION ON CRACK RESISTANCE CAPACITY OF ABNORMAL INTERIOR JOINTS IN REINFORCED CONCRETE FRAME STRUCTURES

作　　者：邢国华[1] 吴涛[1] 刘伯权[1] 杨乐[1] 姚显贵[1] 

机构地区：[1]长安大学,西安710061

出　　处：《工业建筑》2009年第6期55-58,共4页Industrial Construction

基　　金：国家自然科学基金资助项目(50608004);教育部高校博士点基金资助项目(20060710004)

摘　　要：基于6个钢筋混凝土框架异型中节点试件的试验研究,分析了节点核心区尺寸、轴压比等因素对异型中节点抗裂性能的影响。结果表明:节点开裂前核心区混凝土基本处于弹性工作阶段,异型中节点的剪力主要由小核心(小梁与上柱构成的区域)混凝土承担,增大轴压比可以提高异型中节点试件的抗裂承载能力。在试验研究的基础上,提出异型中节点抗裂承载力计算公式,并与11个异型节点试件的试验结果进行对比,吻合较好。Six specimens of abnormal interior joints were tested under reversed cyclic loading. Experimental studies were carried out to investigate the influence of joint core dimensions and axial compression ratio on crack resistance of abnormal joints. The results showed that the crack resistance capacity was mainly provided by the minor core concrete （determined by the top column and the small beam）, and the minor core concrete was in elastic stage before cracks appeared. Furthermore, axial compression ratio was a significant parameter to increase the crack resistance capacity. Based on the test results, a theoretical formula of crack resistance capacity was proposed. The calculated crack resistance capacities of 11 abnormal interior joints were compared with the experimental results, and a good agreement was obtained.

关 键 词：异型中节点 抗裂承载力 框架 小核心 

分 类 号：TU375.4[建筑科学—结构工程] TU473.1