改进纤维模型单元在剪力墙非线性分析中的应用

Application of Improved Fiber Model Unit in Non-linear Analysis of Shear Wall

目前的纤维模型只能模拟构件的弯曲和轴向变形,不能模拟构件的剪切变形,为了精确地对剪力墙进行非线性分析,应建立考虑弯矩、轴向和剪切变形共同影响的纤维模型。从材料的应力、应变关系出发,在纤维模型研究的基础上,对剪切模量与弹性模量之间的关系进行分析研究,并进行数值模拟及试验对比分析。提出了一种考虑弹塑性剪切变形的纤维墙单元模型,数值模拟与试验结果吻合。结果表明,在荷载变形曲线的上升段直到极限荷载乃至软化段都有较好的模拟,改进的纤维模型模拟能较好地反应钢筋混凝土剪力墙的滞回性能。

In order to carry out the nonlinear analysis for shear walls accurately, the new fiber model should be set up considering the bending moment, axial and shear deformation to replace the existing fiber model. According to the stress-strain relationship of materials, the relationship of shear modulus and elastic modulus is analyzed and studied, and an improved unit model of fiber wall is proposed here considering the elastic-plastic shear deformation. The results from tests and analysis show that this im- proved model could better reflect the hysteretic behavior of reinforced concrete shear walls.