单层房屋钢木组合屋盖整体工作性能分析

The Whole Working Performance Analysis on Single-Story Steel-Wood Composite Roof

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.

The purpose of this paper is to analyze and testify the effect of wood structure stiffness by the metal skin diaphragm, and to calculate the stiffness of the roof. The load-displacement of eaves is simulated by ANSYS under horizontal loads, which is the place of 11 longitudinal columns a single-story structure of steel-wood composite roof. The load-displacement are analyzed under the condition of five situations including wood frame, wood frame with gable plate, wood frame with four walls of steel frame, wood frame with four walls of steel frame and half-slope roof, wood frame with four walls of steel frame and double-slope roof. And the stiffness of the roof is calculat-ed through regression analysis of the load-displacement curves by least squares. The results from ANSYS coincide well with the experimental results. Results show that gable plate mainly increases the rigidity of gable frame, which has little contribution to increasing the rigidity of inner frames, and longitudinal wall with steel plate has little contribution to increasing the lateral rigidity of transverse frames ,but the skin effect of roof plate could significantly increase the rigidity of inner frames, and the gable is not absolutely rigid.