跨高比L/h≤1.5复合配筋连梁箍筋受力性能的拉杆-压杆模型分析  

STRUT AND TIE MODEL ANALYSIS OF SHEAR CAPACITY FOR STIRRUP IN COMPOSITELY REINFORCED COUPLING BEAMS WITH SPAN-TO-DEPTH RATIO L/h≤1.5

作　　者：皮天祥[1,2] 罗俊[1] 张爱环[1] 罗然[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045

出　　处：《工程力学》2015年第4期69-76,共8页Engineering Mechanics

基　　金：重庆市科委自然科学基金项目(CSTC;2010BB4211)

摘　　要：试验表明:对称设置斜向钢筋的小跨高比复合配筋连梁具有良好的抗震性能,在建立并求解水平地震作用下该连梁中由混凝土主斜压杆、次斜压杆、对角斜筋拉、压杆和菱形筋拉杆等组成的超静定拉杆-压杆联合工作受力分析模型基础上,通过对连梁箍筋参与的传力机构分析,提出了由箍筋和混凝土次生斜压杆组成的箍筋桁架宏模型,建立了该模型中各箍筋拉杆和混凝土压杆的几何及变形协调方程、物理方程和平衡方程等共26个计算式和分析程序,2个试验试件的算例对比分析结果显示,该模型能反映连梁屈服后各受力阶段箍筋的受力状态,且计算结果具有较好的准确性。Experiment shows that the small span-to-depth ratio compositely reinforced coupling beams(CRCB) with symmetrical diagonal reinforcements have good seismic performance. Based on establishment of the statically indeterminate strut and tie united working model, which is comprised of main concrete diagonal struts, secondary-diagonal struts, diagonal reinforcement struts and ties and rhombic ribs under action of horizontal earthquake, and through mechanic analysis of stirrups in the coupling beam, a new stirrup macro truss model composed by stirrups and subsidiary struts is proposed. A total of 26 formula and a calculation program containing the geometric deformation,compatibility equations, constitutive equations and equilibrium equations are established. Comparative analysis on examples of two specimens illustrates that the model can reflect the stress state of stirrups on each loading stage after member yielding and the simulated results agree with the experiment.

关 键 词：超静定拉压杆模型 变形协调方程 小跨高比连梁 箍筋 抗剪 

分 类 号：TU973.3[建筑科学—结构工程]