基于纤维梁柱单元的RC带翼缘剪力墙抗震性能分析

为高效准确地模拟钢筋混凝土构件在复杂荷载作用下非线性行为，采用OpenSees中基于刚度法的纤维梁柱单元，建立一种考虑弯曲和剪切共同作用的RC带翼缘剪力墙非线性分析模型，并对已完成的4个不同边缘构件和截面形式的RC带翼缘剪力墙的拟静力试验进行数值模拟；通过比较数值模拟结果与试验结果，验证有限元模型的准确性；通过有限元分析，研究轴压比(0.1~0.3)、剪跨比(1.8~3.0)、翼缘宽度与腹板高度比(0.5~1.1)、混凝土强度(C30~C45)、纵筋配筋率(0.73%~2.22%)以及箍筋配箍率(0.74%~5.19%)对RC带翼缘剪力墙抗震性能的影响。研究表明：随着轴压比、翼缘宽度与腹板高度比、混凝土强度以及纵筋配筋率的增大，带翼缘剪力墙的承载力逐渐增大，其极限变形能力在翼缘受拉方向也相应增大，而在翼缘受压方向不断减小。剪跨比的增大使得带翼缘剪力墙的承载力明显减小，但是变形能力大幅提高。箍筋配箍率的提高可以有效延缓带翼缘剪力墙翼缘受拉方向的破坏。

Seismic behavior of RC shear walls with flange based on fiber beam-column element

To effectively and accurately simulate the nonlinear behavior of reinforced concrete members under complex loads, a nonlinear analysis model for RC shear walls with flange considering the combined action of bending and shearing was established by using the stiffness-based fiber beam-column elements in OpenSees. The quasi-static tests of four RC shear walls with flange were simulated through the proposed finite element model. The accuracy of the model was verified by comparing the numerical simulation results with the test results. Through the finite element analysis, the effects of axial compression ratio, shear span ratio, flange width to web height ratio, concrete strength, longitudinal reinforcement ratio, and stirrup reinforcement ratio on the seismic behavior of RC shear walls with flange were investigated. The research shows that, with the increase of axial compression ratio, flange width to web height ratio, concrete strength, and longitudinal reinforcement ratio, the bearing capacity of shear wall with flange increases gradually. Its ultimate deformation capacity increases in the flange-in-tension direction, but decreases in the flange-in-compression direction. Increasing the shear span ratio of shear wall with flange leads to a significant decrease in bearing capacity, but a great increase in deformation capacity. The increase of stirrup reinforcement ratio can effectively delay the failure of shear walls with flange in the flange-in-tension direction.