钢结构平台跨度10m*10m,四个角上四个柱子,这种结构要用多大h型钢?怎么计算?

上铺楼承板,水泥钢筋,保温层,地砖,要求能上人。
2025-03-15 08:12:30
推荐回答(1个)
回答1:

根据你描述,是一个四角有柱子的框架结构,柱子是轴向承压构件,主要考虑楼面荷载,传递给构件的竖向荷载。还要考虑柱子自身稳定性。

  1. 荷载一般做组合楼承板120mm厚,考虑面层保温按150mm混凝土考虑,恒载按 25.6*0.15=3.84kN/m^2 ,其他楼面恒载按2KN/m^2考虑,恒载一共5.84kN/m^2; 活荷载按上人结构,根据功能不同,例如按住宅,办公楼,根据规范取活荷载2kN/m^2。(当然还有地震作用,侧向风荷载作用,可根据情况考虑)

  2. 荷载组合(主要考虑恒活荷载),1.2D+1.4L  或者   1.3D+1.4*0.7*L  (寻找较为危险的荷载组合,其中D为恒载,L为活载)

  3. 立柱竖向荷载计算,根据荷载组合计算柱子承受的组合设计荷载值,目前计算为 9.552*10*10/4=238.8kN 竖向荷载

  4. 根据竖向荷载计算 柱子强度和稳定性,具体可以参考,《钢结构设计规范》,这里仅示意对强度进行校验。N/AN*f= 238.8*1000/235=1016mm^3 考虑到稳定系数,截面放大个1.5倍  柱子截面积最小要大于1524mm^3   考虑H型钢长细比稳定性,宜采用宽翼缘H型钢 例如 H350x350x12x19 

  

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