高强混凝土—型钢组合剪力墙抗震性能非线性有限元分析

目的在低周反复荷载试验的基础上,对高强混凝土—型钢组合剪力墙的承载力和变形能力进行有限元分析,模拟分析混凝土强度等级、轴压比和配筋率等因素对高强混凝土剪力墙承载力的影响.方法将剪力墙各部件用有限元相关单元模型和本构关系进行模拟,建立合理的有限元模型,并对其进行非线性有限元分析.结果带有钢框架及带有斜向支撑钢框架剪力墙的抗震性能要好于普通的钢筋混凝土剪力墙,有限元分析结果与试验结果吻合较好,有限元分析可以作为低周反复荷载试验的有效补充.结论有限元模型可模拟实际剪力墙的受力性能,混凝土强度等级、轴压比、边柱纵筋配筋率等六个因素对高强混凝土剪力墙的极限荷载影响较大,对于开裂荷载,轴压比对其影响较大,对这些参数进行合理的调整可以提高剪力墙的抗震性能.

Nonlinear Finite Element Analysis on Seismic Performance of High Strength Concrete- Formed Steel Composite Shear Walls

Based on the experiments of the reversed low cyclic loads,the loading capacity and the deformability of the high strength concrete-formed steel composite shear walls are studied by nonlinear finite element analysis,and the effects of concrete grades,ratios of axial compression,and reinforcement ratios on loading capacity of the shear wall are further investigated.The components of the shear walls were simulated by the constitutive relation and the related model units,from which the reasonable finite element model are established.Then,the nonlinear finite element analyses of the shear walls were performed.The seismic performance of the shear walls with steel frames and those with the steel frames consisting of tilt braces was better than the reinforced shear walls.The results of the finite element analyses accorded well with the results of experiments and the nonlinear finite element analysis effectively complemented the experiments of the reversed low cyclic loads.The finite element model can simulate the actual behavior of the shear walls.The factors such as the concrete grades,cracking load,and the ratio of the axial force to the axial capacity and the reinforced ratio of side columns have a great effect on the ultimate load of the high strength concrete shear walls,and the ratio of the axial force to the axial capacity has a great effect on the cracking load;the appropriate adjustments of these parameters can increase the seismic performance of the shear walls.