【作者】 陈卫海；

【导师】 何保康；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2008， 硕士

【摘要】 本文对正被推广应用的高强度轻型钢结构住宅墙体的抗剪性能进行了研究。研究的墙体类型为双面无板带交叉扁钢拉条支撑墙体,钢材强度为550MPa,采用试验研究和非线性有限元分析两种方法研究墙体的抗剪性能。文中对无竖向力水平单调加载和有竖向力低周反复加载两种加载方式下的2面交叉支撑墙体抗剪性能进行了足尺试件试验研究,详细描述了试验装置、试验现象、试验数据处理情况及试验结果。试验结果表明:此类墙体试件破坏是由于下导轨或边柱受压破坏而导致的;单调加载作用下的墙体抗剪承载力比低周反复加载作用下的高;墙体试件的抗剪强度为9.00kN/m～10.01kN/m,其抗剪强度是双面覆板墙体的60%～67%,说明此类墙体的交叉支撑对抗剪起到了很重要的作用。文中对单调加载作用下的墙体试件进行了有限元模拟,有限元模型同时考虑了材料非线性和几何非线性,模型中各构件均选取塑性壳单元Shell 181来模拟,墙体各构件的螺钉连接采用耦合方法处理,并根据试验墙体的真实受力建立了合理的边界条件进行模型加载求解。有限元分析结果与试验结果吻合较好,验证了有限元模型的正确性。在此基础上,对墙体立柱间距、立柱截面尺寸、交叉支撑截面尺寸、单面设置交叉支撑以及施加竖向力等影响墙体抗剪承载力的5个因素进行了参数分析。分析结果表明:立柱间距、交叉支撑截面对墙体抗剪承载力影响较小;随着立柱截面尺寸的增大,墙体抗剪承载力显著增加;随着竖向荷载值的增加,墙体抗剪承载力降低;单面设置交叉支撑墙体比双面设置交叉支撑墙体的承载力降低幅度较大。更多还原

【Abstract】 The shear performance of high strength light steel dwelling walls being popularized and applied in our country is studied in this paper. The type of the wall studied in this paper is the wall cross-braced by the flat steel on both sides without wallboards, of which the steel strength is 550MPa. And the shear performance of the wall is studied by two methods, experimental research and nonlinear finite element analysis.Experimental research on the shear performance of two full-size high strength cold-formed thin-walled steel framing walls with cross-bracing, under monotonic loading without vertical compression loading and cyclic loading with vertical compression loading, is carried out in this paper. And the test set-up, the test phenomena, the data processing and the test results are described detailedly. Experimental results show that the failure of the wall specimens is due to the compression failure of the bottom track or the end stud; the shear resistance of wall specimens under monotonic loading is higher than that of wall specimens under cyclic loading; the shear strength of wall specimens, 60%～67% that of walls with double boards, is between 9.00kN/m and 10.01kN/m, which shows that the flat steel cross-bracing plays an important role in the shear performance of the walls with cross-bracing.The wall specimens under monotonic loading are simulated by the finite element program. And the material nonlinearity and the geometric nonlinearity are considered simultaneously in the finite element model, in which all members are simulated by the plastic shell element Shell 181, and the screw connections of all members are simulated by the coupling command. Moreover, the reasonable boundary conditions are established according to the test wall specimens for the loading and solution of the finite element model. And the finite element analysis results agree well with the experimental results, so the finite element model is validated. Based on the finite element model of the wall with cross-bracing, a detailed parameter analysis for five influencing factors of the shear resistance of the wall is carried out, including wall stud spacing, cross section of the wall stud, cross section of the cross-brace, setting flat steel cross-brace on one side, vertical loading and so on. And the finite element analysis results show that the wall stud spacing and the cross section of the cross-brace have little influence on the shear resistance of the wall; the shear resistance of the wall increases significantly with the increase of the cross section of the wall stud; the shear resistance of the wall decreases as the applied vertical load increases; the shear resistance of the wall setting flat steel cross-brace on one side is much lower than that of the wall setting flat steel cross-brace on both sides.更多还原