钢筋混凝土框架节点抗裂承载力研究  

STUDY ON CRACK RESISTANCE OF BEAM-COLUMN JOINTS IN REINFORCED CONCRETE FRAME STRUCTURES

作　　者：邢国华[1] 吴涛[1] 刘伯权[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《工程力学》2011年第3期163-169,共7页Engineering Mechanics

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

摘　　要：根据10个钢筋混凝土框架变梁中节点试件低周反复荷载试验,重点分析了节点核心区尺寸、轴压比等因素对该类非常规节点抗裂性能的影响。结果表明:该类节点左梁、右梁刚度不同,反复荷载下柱端轴压力发生波动,理论分析时可用系数α来表征轴压力对节点区抗裂性能的影响。在以往试验研究的基础上提出包含系数α的框架节点(如常规中节点、边节点、宽扁梁节点、变梁中节点等)抗裂承载力计算公式,并通过国内外97个节点试件的108组试验数据对其进行验证,吻合良好。Ten specimens of interior joints with different depth beams were tested under reversed cyclic loadings.The experimental study was conducted by focusing on the influence of joint core dimensions and axial compression ratio on crack resistance of interior joints.Test results indicate that the column axial load fluctuates from time to time because of the unbalanced force occurred in the beam-column subassemblage due to the significant difference on stiffness between the deeper beam and the shallow beam.Based on the test results,a theoretical expression of influencing factors α was put forward.Furthermore,a theoretical formula of crack resistance capacity of beam-column joints（including ordinary interior joints,exterior joints,wide flat beam-column joints and joints with different depth beams） was proposed in this study.The formula was verified using 108 test data of 97 beam-column joints at home and abroad.The good agreement between the experimental results and prediction results of suggested formula is achieved.

关 键 词：中节点 抗裂承载力 框架结构 简化计算方法 钢筋混凝土 

分 类 号：TU375.4[建筑科学—结构工程]