冷弯薄壁型钢混凝土剪力墙受剪承载力计算模型  

Analytical model for predicting shear strength of cold-formed thin-walled steel reinforced concrete shear walls

作　　者：初明进[1,2] 冯鹏[1] 叶列平[1] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]烟台大学土木工程学院,山东烟台264005

出　　处：《建筑结构学报》2011年第9期107-114,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51078321);长江学者和创新团队发展计划项目(IRT00736);山东省自然科学基金项目(Y2008F43)

摘　　要：冷弯薄壁型钢混凝土剪力墙(CTSRC剪力墙)在水平地震作用下经历整截面墙体受力和分缝墙体受力两个阶段,破坏模式和受力机理与传统剪力墙不同。剪跨比小于2.0的CTSRC剪力墙在峰值荷载前表现为整截面墙体的受力性能,峰值荷载时宏观竖向裂缝两侧混凝土发生滑移,墙体逐渐演变为分缝剪力墙,有较好的耗能能力。针对CTSRC剪力墙的受力特征,将钢筋混凝土剪力墙的软化拉压杆模型与混凝土界面直剪受力的软化拉压杆模型相结合,考虑竖向裂缝处短细斜裂缝间混凝土破坏引起的竖向裂缝两侧混凝土的滑移,建立了CTSRC剪力墙受剪承载力的拉压杆-滑移分析模型和计算方法,计算结果和试验结果吻合良好,表明拉压杆-滑移模型可以较好地反映剪跨比小于2的CTSRC剪力墙的受力机理,能够较准确地预测CTSRC剪力墙的受剪承载力。The failure process of steel-concrete composite structure,CTSRC（cold-formed thin-walled steel reinforced concrete） shear wall,which is different from that of RC wall,undergoes from integral wall to slit wall under horizontal seismic load.The behavior of CTSRC walls with shear span ratios less than 2.0 is identical to that of the integral wall before peak load.At peak load,the relative slippage perpendicular to the vertical crack takes place abruptly.Then the wall changes into slip walls.Based on the softened strut-and-tie model,a new analytical model called the softened strut-and-slip model was proposed and used to calculate the shear strength.It is found that the model can reproduce the test results with satisfactory agreement.The softened strut-and-slip model can provide beneficial insights into the shear behavior of CTSRC walls,and can determine the shear strength accurately.

关 键 词：冷弯薄壁型钢混凝土剪力墙 受剪承载力 拉压杆模型 滑移 

分 类 号：TU398.902[建筑科学—结构工程]