钢筋混凝土剪力墙拉弯受力性能试验和模拟

EXPERIMENTAL TESTS AND MODELING ON AXIAL TENSIONFLEXURE BEHAVIOR OF REINFORCED CONCRETE SHEAR WALLS

完成了4个剪跨比为2.0的钢筋混凝土(RC)墙在恒定轴拉力和往复水平力作用下的拟静力试验,研究了RC剪力墙在拉弯受力下的破坏模式、滞回性能、承载力、刚度、变形能力和耗能等。试验结果表明:RC墙试件出现了两种破坏模式,包括弯曲-滑移破坏(竖向钢筋平均拉应力比n_(s)=0.23~0.63)和弯曲破坏(n_(s)=0.91);轴拉力显著降低了RC墙的抗侧承载力、刚度和耗能能力,试件HSW4(n_(s)=0.91)的承载力比试件HSW1(n_(s)=0.23)的低41%;RC墙试件的极限位移角为1.3%~1.6%,大于GB 50010-2010规定的弹塑性位移角限值1/100。采用实测裂缝宽度和Vecchio-Collin_(s)公式计算了沿贯通裂面的抗滑移承载力退化曲线,揭示了试件弯曲-滑移破坏机理。采用有限元软件VecTor2建立了RC剪力墙拉弯受力分析的数值模型,分析结果与试验结果吻合良好,能准确预测试件的破坏模式、刚度和承载力。

This paper presents a series of quasi-static tests of four reinforced concrete(RC)wall specimen_(s) with aspect ratio of 2.0 subjected to axial ten_(s)ile forces and lateral cyclic loading.The coupled axial ten_(s)ion-flexure behavior of RC walls is investigated including the failure modes,hysteretic respon_(s)e,strength,stiffness,deformation and energy dissipation capacities.The test results indicate two types of failure modes for the wall specimen_(s),including flexure-sliding failure(for specimen_(s) with the normalized vertical reinforcement ten_(s)ile stress n_(s)=0.23~0.63)and flexure failure(for specimen with n_(s)=0.91).The axial ten_(s)ile force results in significant decrease of lateral strength,stiffness and energy dissipation capacity of the RC wall specimen_(s).The maximum strength of specimen HSW4(n_(s)=0.91)is smaller than that of HSW1(n_(s)=0.23)by 41%.The ultimate drift ratio of the RC wall specimen_(s) ranges from 1.3%to 1.6%,exceeding the inelastic drift limit of 1/100 specified in the Chinese code GB 50010-2010.Using the measured crack width data and Vecchio-Collin_(s) equation,the shearsliding strength capacity degradation along the critical crack surface is calculated,and the mechanism of flexuralsliding failure is revealed.A rigorous finite element(FE)model is developed using VecTor2 software to simulate the coupled axial ten_(s)ion-flexural behavior of RC walls.The FE analytical results agree well with the experimental results,providing accurate prediction of failure modes,stiffness and strength of the wall specimen_(s).