拆装式箱型房屋底框抗弯刚度及影响因素研究

RESEARCH ON THE FLEXURAL STIFFNESS OF BOTTOM FRAME OF REMOVABLE BOX HOUSE AND ITS INFLUENCING FACTORS

通过对拆装式箱型房屋底框的抗弯刚度进行试验和有限元模拟分析,对比了底框梁1/4截面、跨中以及底框中心处的荷载-位移曲线,结果表明:有限元模拟结果与试验结果吻合,验证了有限元分析的可靠性;基于有限元数值模拟,分析了底框硅酸钙板楼板、角件开孔、立柱与顶底框的螺栓连接刚度、角件角部约束4个因素对底框抗弯刚度的影响,得到了不同影响因素下底框梁的跨中荷载-位移曲线,结果表明:立柱与顶底框角件的连接属于半刚性连接,角件开孔对跨中荷载-位移曲线的影响较小,硅酸钙板、螺栓的连接刚度以及角部约束对底框抗弯刚度的影响较大,分析时应考虑。

Through the test and finite element simulation analysis of the flexural stiffness of bottom box of removable box house,the load-displacement curves of the bottom frame beam at the 1/4 section,the middle span and the bottom frame center were compared.The results showed that the finite element simulation results were in good agreement with the experimental results,and the reliability of the finite element analysis was verified.Based on the finite element numerical simulation,the influence of the four factors on the flexural stiffness of bottom frame,such as calcium silicate board floor,corner opening,column and top and bottom frame bolted connection stiffness,corner piece corner constraint was analyzed,and the mid-span versus displacement curves of the bottom frame beam under different influencing tactors were obtained.The resulets showed that the connection between the column and the top and bottom frame was a semi-rigid connection.The influence of the opening of the corner piece on the mid-span load versus displacement curve was small,the connection stiffness of the calcium silicate board and the bolt,and the bending stiffness of the corner had a greater impact on the flexural stiffness,so these factors should be considered in the analysis.