考虑剪切变形和弯剪相互作用的带翼缘剪力墙数值模型

Numerical modeling of flanged RC shear walls considering shear deformation and coupled flexural-shear effects

提出了一种基于柔度法的考虑剪切变形和弯剪耦合效应的有限元模型,通过T形和L形剪力墙试件拟静力试验验证了模型的正确性。结果表明,所有试件的破坏形态为无翼缘腹板端部混凝土压碎、纵筋压曲的弯曲破坏;增强无翼缘腹板端部约束和边缘构件约束,可以防止其发生受压过早破坏;腹板和翼缘相交处未观察到明显的混凝土剥落现象,腹板和翼缘相交处的约束边缘构件抗震设计可以适当放宽;随着剪跨比的减小,试件延性明显降低;当翼缘处于受拉时,试件表现出较高的强度、刚度和较低的延性。基于模型对钢筋混凝土带翼缘剪力墙的拟静力试验进行了非线性数值模拟分析,分析结果与试验结果吻合较好,表明模型能较好地模拟钢筋混凝土带翼缘剪力墙的非线性性能。

A new flexibility-based nonlinear finite element model that considers shear deformation and coupled flexural-shear effects is proposed in this article.Cyclic loading tests of T-shaped and L-shaped shear wall specimens were conducted to verify the validity of the proposed model.All specimens exhibited a flexural failure mode characterized by the crushing of the concrete and the buckling of the reinforcement at the free web boundary.Closer stirrups and longer confined boundary elements should be used in the free web end to prevent premature failure when compressed.The seismic design of the boundary element at the web-flange junction could be relaxed,as no concrete spalling was observed at the web-flange junction.The ductility decreased as the shear span ratio decreased.The specimens exhibited higher strength and stiffness but lower ductility when the flange was in tension.Numerical simulation of the cyclic loading test of the RC flanged shear wall was conducted based on the proposed model,demonstrating that the model efficiently simulates the nonlinear response of RC flanged shear walls,as proved by satisfactory agreement between the analytical results and the test results.