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采用平面应力单元与薄板弯曲单元叠加方法构建平板壳单元,经低周反复加载的试验验证,表明能有效分析弹性阶段内短肢剪力墙的剪滞效应。有限元分析和试验结果均显示:在弹性阶段内,翼板截面上正应力分布不均匀,剪滞效应明显,腹板与翼板交界处易形成正应力集中;进入塑性阶段后,由于应力重分布,翼板截面上正应力分布更不均匀,最大正应力出现位置随着反复加载会出现变动。所以应务必给短肢剪力墙截面留出可应力重分布的余地,保证翼板的大部分截面随着塑性变形的发展能渐次发挥其全部的承载能力。
The flat shell element was constructed by the superposition of the plane stress element and the thin plate bending element. The test was validated by the low-frequency cyclic loading test, which shows that the shear lag effect of the short-limbed shear wall in the elastic phase can be effectively analyzed. The results of finite element analysis and experimental results show that the normal stress distribution is not uniform and the shear lag effect is obvious during the elastic phase, and the normal stress concentration tends to form at the junction of web and wing. After entering the plastic phase, Distribution, the flange section of the positive stress distribution is more uneven, the maximum normal stress occurs with repeated loading will change. Therefore, it is necessary to leave a room for the stress redistribution to the short-limbed shear wall section so as to ensure that most of the section of the wing plate will gradually exert its full carrying capacity with the development of plastic deformation.