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目的分析验证钢板蒙皮效应对木结构框架刚度的影响,并计算屋架的刚度.方法应用ANSYS对单层房屋钢木组合屋盖结构的荷载-位移进行模拟,分析在水平荷载作用下5种组合屋盖下纵向11根柱子檐口处的荷载-位移变化情况;并应用最小二乘法对屋架荷载-位移关系进行回归分析,比较屋架刚度.结果有限元计算结果与试验结果比较,误差值最大为19.8%,最小为0.6%;所有数据误差绝对值的平均值为10.7%,有限元分析结果与试验结果较为吻合,说明采用塑性壳体单元、梁单元、弹簧单元建立有限元模型,可以较好地模拟钢木组合屋盖结构建筑的受力分析,建模方法可用于之后的有限元分析.结论研究表明山墙加钢板,主要增加了山墙框架的刚度,对中间框架刚度提高的贡献不明显;纵墙加钢板对各横向框架的侧向刚度的贡献均很小;而屋面钢板的蒙皮作用能显著提高中间每榀框架的刚度,且山墙不是绝对刚性的.
Aim To analyze and verify the effect of steel skin effect on the stiffness of wood frame and calculate the stiffness of the roof truss.METHODS Load-displacement of steel-wood composite roof structure of single-story house was simulated by ANSYS, and five combinations under horizontal load The load-displacement of 11 columns under the roof was changed, and the least square method was used to analyze the load-displacement relationship of the roof truss and the rigidity of the truss was compared.Results Compared with the experimental results, the maximum value of error was 19.8 %, And the minimum value is 0.6%. The average value of the absolute value of all the data errors is 10.7%. The results of finite element analysis are in good agreement with the experimental results. It shows that the finite element model of plastic shell element, beam element and spring element can be well established The force analysis and modeling method of the steel-wood composite roof structure can be used in the subsequent finite element analysis.Conclusion The research shows that the gable steel plate mainly increases the rigidity of the gable frame and does not make any significant contribution to the increase of the rigidity of the middle frame. The wall plus steel contributes little to the lateral stiffness of each lateral frame, whereas the skinning of the roofing steel plate significantly increases the Stiffness, and gables are not absolutely rigid.