交叉加劲薄钢板剪力墙简化模型

Simplified model of diagonally stiffened thin steel plate shear walls

摘要:

薄钢板剪力墙依靠内填钢板屈曲后形成拉力带以抵抗水平荷载,是一种适用于高烈度地区的新型抗侧力结构.采用精细模型进行钢板剪力墙的计算和设计耗时长,为提高钢板墙结构设计的效率,基于拉力带简化模型,提出了交叉支撑-拉力带简化模型（CBSM）用于模拟交叉加劲钢板剪力墙的抗侧性能.推导了交叉加劲钢板墙的初始刚度和承载力计算公式,通过ABAQUS有限元软件建立精细模型和CBSM简化模型,与理论公式计算结果对比,验证简化模型的准确性.结果表明,在不同的跨度、内填板厚度和加劲肋刚度的情况下,精细模型、CBSM简化模型和理论公式3种方法预测的交叉加劲钢板剪力墙承载力有良好的一致性,说明CBSM简化模型能够较准确地预测交叉加劲钢板剪力墙的承载力,反映出加劲肋对钢板剪力墙结构抗侧能力的贡献.初始刚度理论计算公式与精细模型吻合得较好,CBSM简化模型预测刚度低于精细模型,是偏于安全的.

Abstract:

Thin steel plate shear wall (SPSW) is a new type of lateral resistance structure suitable for high seismic intensity area, which relies on the tension field formed by the buckling of infilled thin steel plate to resist the horizontal load.It takes a long time to calculate and design SPSW using the detailed model.Thus, in order to improve the efficiency of the SPSW structure design,a simplified model of cross brace-strip model (CBSM)based on the strip model(SM)was proposed to simulate the lateral behavior of diagonally stiffened thin SPSW.The calculation formulas of initial stiffness and bearing capacity of the diagonally stiffened SPSW were derived. The detailed model and the CBSM were established by finite element software ABAQUS. The accuracy of the CBSM and the detailed model were verified by comparing the calculated results with the theoretical formula.The results showed that the detailed model, the simplified CBSM, and the theoretical formula had good consistency in predicting the bearing capacity of the diagonally stiffened thin SPSW with different spans, thicknesses, and stiffener stiffness.It was indicated that the simplified CBSM could accurately predict the bearing capacity of the diagonally stiffened thin SPSW and reflect the contribution of stiffeners to the lateral resistance of the SPSW structure.The theoretical formula of the initial stiffness agreed well with that of the detailed model, and the predicted stiffness of the CBSM was lower than that of the detailed model and therefore proved to be safe.