(1 重庆交通大学土木工程学院, 重庆 400074; 2 浙大宁波理工学院土木建筑工程学院, 宁波315100; 3 新加坡南洋理工大学土木与环境工程学院, 新加坡 639798)

摘要: 工字形钢筋混凝土剪力墙因具有较高的承载力与刚度,被广泛运用于建筑结构抗震设计之中。 有效刚度对于钢筋混凝土剪力墙的抗震性能有着重要影响。 利用有限元软件 DIANA 对拟静力加载下工字形钢筋混凝土剪力墙进行研究,分析了翼缘宽度、轴压比、剪跨比、腹板纵筋强度、翼缘纵筋配筋率对有效刚度的影响。 结果表明,工字形钢筋混凝土剪力墙的有效刚度折减系数随着翼缘宽度、腹板纵筋强度的增加而减小,随着轴压比、剪跨比的增大而增大,翼缘纵筋配筋率影响不大。 提出了适用于工字形钢筋混凝土剪力墙有效刚度的计算公式,其计算结果贴合试验值,说明该公式准确度较高,可用于计算工字形钢筋混凝土剪力墙的有效刚度。

关键词: 工字形钢筋混凝土剪力墙; 有效刚度; DIANA; 翼缘宽度; 轴压比; 剪跨比; 腹板纵筋强度; 翼缘纵筋配筋率

中图分类号:TU375 文献标志码:A 文章编号:1002-848X(2022)13-0112-08

DOI:10. 19701 / j. jzjg. 20201026

Study on effective stiffness of H-shaped reinforced concrete shear wall

YU Lei1, MA Jiaxing2, WANG Yinhui1,2, LI Bing3

(1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;2 School of Civil Engineering and Architecture, Ningbo Tech University, Ningbo 315100, China;3 School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore)

Abstract: H-shaped reinforced concrete shear wall is widely used in seismic design of building structures, owning to the high bearing capacity and stiffness. The effective stiffness has an important effect on the seismic performance of reinforced concrete shear wall. The finite element software DIANA was used to study H-shaped reinforced concrete shear wall under quasi-static loading, and the effects of flange widths, axial load ratios, shear span ratios, stresses of vertical web reinforcement and vertical flange reinforcement ratios on effective stiffness were analyzed. The result show that the effective stiffness ratio of H-shaped structural walls decreases with the raise of flange width and stresses of vertical web reinforcement, and increases with the growth of axial load ratios and shear span ratios, and vertical flange reinforcement ratios has little effect. An equation was specifically developed for the effective stiffness of H-shaped structural walls, which showed a good agreement with experimental results, indicating that the formula has high accuracy and can be used to calculate the effective stiffness of H-shaped reinforced concrete shear walls.

Keywords:H-shaped reinforced concrete shear wall; effective stiffness; DIANA; flange width; axial load ratio; shear span ratio; stress of vertical web reinforcement; vertical flange reinforcement ratio