基于软化拉-压杆模型方法的钢筋混凝土变梁中节点抗剪承载力研究  

SHEAR STRENGTH OF RC FRAME JOINTS CONNECTING BEAMS WITH DIFFERENT DEPTHS USING SOFTENED STRUT-AND-TIE MODEL

作　　者：吴涛[1] 邢国华[1] 刘伯权[1] 黄华[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》2010年第9期201-208,共8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个梁高不等钢筋混凝土框架中节点试件在低周反复荷载作用下的试验结果,重点分析了该类框架节点的破坏过程和破坏特点。在试验研究的基础上,建立了框架中节点等效核心区在剪、压复合作用下的计算模型,应用软化拉-压杆模型方法(简称SSTM)对等效核心区进行了受力分析。研究表明:软化拉-压杆模型理论计算值与试验结果接近,与现行规范建议方法计算结果相当,但软化拉-压杆模型方法有明确的力学计算模型,能较为合理地反映框架节点的受力机理。Ten interior joint specimens of beams with different depths were tested under reversed cyclic loading. The failure characteristics and failure processes of interior joints were analyzed. Based on the experimental study, an analytical model for the equivalent joint core of the frame joint under the combined actions of axial and shear loads was established, and the shear strength of the equivalent joint core of tested specimens was calculated by using softened strut and tie model（SSTM）. Results showed good agreement in the shear strength of the joint between the SSTM results and the experimental results, and these results are close to those of the code method. The SSTM has a clear mechanical model and can reasonable reveal the failure mechanism of beam-column joint.

关 键 词：变梁 中节点 计算模型 软化拉-压杆模型 简化计算方法 

分 类 号：TU375.4[建筑科学—结构工程]