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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 cold-formed thin-walled steel reinforced concrete shear wall (CTSRC shear wall) under the action of horizontal earthquake experiences the stress of the whole cross-section wall and the stress of the divided wall. The failure mode and stress mechanism are different from the traditional shear wall . The CTSRC shear wall with shear span ratio less than 2.0 shows the stress performance of the whole cross-section wall before peak load. The concrete slides on both sides of the macro-vertical fracture at peak load, the wall gradually evolves into the sub- Have better energy-consuming ability. In view of the force characteristics of CTSRC shear wall, the model of softened tension-compression bar of reinforced concrete shear wall is combined with the softened tension-compression bar model of direct shear strength of concrete interface, considering the concrete failure between short and thin oblique cracks in vertical cracks Induced sliding cracks on both sides of the vertical cracks, the CTSRC shear wall shear bearing capacity of the tension-compression rod - slip analysis model and calculation method, the calculated results and the test results agree well, indicating that the tension and compression rod - slip The model can well reflect the stress mechanism of CTSRC shear wall with shear-span ratio less than 2, and can predict the shear capacity of CTSRC shear wall with more accuracy.