基于非完全拉力场理论的钢板剪力墙通用三拉杆模型

Universal three-strip model of steel plate shear walls based on incomplete tension field theory

钢板剪力墙在受剪屈曲后仍然具有一定的抗压能力,对其刚度和承载力的影响不容忽视。为了计入该作用,同时消除现有钢板剪力墙杆系等代模型中所存在的杆单元节点不重合、梁柱小单元多的问题,提出通用三拉杆模型。该模型中仅采用连接于钢板剪力墙边框梁柱中点和端点的3个拉杆代替墙板,拉杆的截面积和材性基于非完全拉力场理论确定,可有效考虑任意厚度墙板屈曲后抗压能力的影响,同时也可解决杆单元节点不重合问题。分析结果表明:该模型可以准确预测钢板剪力墙结构的非线性行为,以精细壳单元模型的计算结果为基准,两种模型的弹性刚度误差不超过5.27%,承载力误差均不超过3.74%,且大多情况不超过2%。滞回性能分析结果表明,该模型可以较为准确地预测钢板剪力墙的滞回性能,对弹性、弹塑性、强化以及破坏阶段模拟效果均较好。此外,基于试验和精细模型框架内力分析的结果,验证了该模型可以得到与精细模型较为一致的内力计算结果,与精细模型的结果相比,边框柱弯矩的误差不大于5%,对边框柱轴力的分析误差稍大,最大误差为17.6%,但结果偏于安全。

Steel plate shear walls still possess compressive strength after shear buckling,while the effect of shear buckling on stiffness and strength should not be underestimated.To address this phenomenon while concurrently resolving challenges such as non-coincident node positions in current steel plate shear wall models and the presence of an excessive number of small beam-column elements,this study proposed an universal three-strip model.In this model,the infill plates were substituted with just three tension strips,connected to the midpoints and endpoints of the frame columns and beams in the steel plate shear wall.These strips were crafted based on the principles of incomplete tension field theory,allowing them to effectively consider the post buckling compressive capacity while addressing the non-coincident node positioning challenges within the beam-column elements.The parameter analyses show that the model accurately predicts the nonlinear behavior of steel plate shear wall structures.Using the calculations of the refined shell element model as reference,the elastic stiffness error of the two models does not exceed 5.27%.The ultimate load-bearing capacity error for both models remains below 3.74%,with the majority of the cases not exceeding 2%.The hysteresis analysis results indicate that the model can predict the hysteretic performance of steel plate shear walls more accurately,with better simulation of elastic,elastic-plastic,strengthening,and damage phases.Additionally,based on the internal force results from the experiments and shell model,it confirms that this model can yield internal force calculations consistent with the shell model.Compared with the results of the shell model,the error in the moments of the boundary columns is not more than 5%,and the error in the analysis of the axial forces of the boundary columns is slightly larger,with a maximum error of 17.6%,but the results are on the safe side.