拉结筋对内配钢板混凝土剪力墙组合作用影响的有限元模型分析

Effect of tie rods on composite action analyzing for R.C. shear wall in-filled with steel plate by the finite element models

为研究拉结筋对内配钢板混凝土剪力墙的组合作用及承载力的影响,以2个带拉结筋的内配钢板混凝土剪力墙试验研究为基础,采用有限元软件ABAQUS建立了33个带拉结筋的内配钢板混凝土剪力墙有限元模型.通过与试验数据对比,在验证了有限元分析模型可行性的基础上,对带拉结筋内配钢板混凝土剪力墙的受力过程进行分析.主要分析组合墙的高宽比,配钢率,钢板局部长厚比,钢板强度,混凝土强度等参数对内配钢板混凝土剪力墙的组合作用、抗剪承载力及延性的影响.研究结果表明:当钢板与混凝土间无拉结筋时,由于钢板在屈服前发生局部屈曲,提高钢板的强度对内配钢板混凝土组合墙承载力提高不大;当内配钢板混凝土剪力墙的高宽比和配钢率不变时,随着钢板局部长厚比的减小,钢板与混凝土的组合作用率、抗剪承载力以及延性都随之提高;在内配钢板混凝土剪力墙的高宽比和钢板局部长厚比不变的条件下,随着配钢率的提高,剪力墙承载力提高,组合作用率却随之降低;配钢率的提高对高宽比为1.5的内配钢板混凝土剪力墙抗剪承载力的提高程度大于高宽比为2的剪力墙.

In order to research the effect of tie rods for composite action and shear strength of steel plate R.C. shear walls, nonlinear finite element analysis was conducted using 33 ABAQUS models, and benchmarked using the experimental results. The paper used the models to analyze the effect of the such parameters, as the aspect ratio, reinforcement ratio, plate slenderness ratio, steel strength and concrete strength on composite action, shear strength and ductility of the composite walls with tie rods. It is presented that the steel strength has no significant effect on the shear strength of the composite shear without tie rods, due to the steel plate buckling before yielding. The decrease of plate slenderness ratio result in the increasing of composite action, shear strength and ductility in the composite walls with the given aspect ratio and reinforcement ratio. Similarly, when steel plate slenderness ratio and aspect ratio are kept constantly, the increase of the steel plate ratio will result in increasing the shear strength and decrease of the composite action in the composite walls, and the increased value of the shear strength of composite walls with aspect ratio of 1.5 is bigger than that with aspect ratio of 2.