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    厂房结构设计中首先要解决的问题  
     
  厂房结构设计中首先要解决的问题是如何配合工艺要求进行柱网的平面布置,过去我们习惯上将柱距模数定为 3m常用3m、6m、9m、12m等),而对于多层轻钢厂房而言,钢架的间距直为6m,亦可采用4.5m、7.5m、9m、12m。刚架的跨度可根据工程需要灵活设定。
3.支撑体系
               
多层厂房轻钢结构侧向刚度较弱,为了抵抗水平风荷载和地震作用,减小层间侧移,应在设置柱间支撑的开间,同时设置屋盖横向水平支撑,以组成几何不变体系。


4、节点构造
               
多层轻钢结构厂房柱多采用焊接工形或箱形截面。由于工形截面腹板比较薄,故在弱轴方向与梁的连接多采用饺接,而强轴方向采用刚接形式。同时多层房屋钢结构的板件宽厚比大,应尽量避免工场现场焊缝连接。图1给出了常用的多层轻钢房屋梁柱连接节点示意图。
5、围护结构
               
为了减轻多层轻钢厂房的自重,围护结构多采用轻质材料。外墙体常采用非承重式轻型墙体,底层墙体常采用1.2m-1.5m高粘土砖砌体。内隔墙可采用夹芯金属板、轻钢龙骨石膏板或空心砌块等轻质填充墙。屋盖结构多采用檩条体系,或轻型桥架加辅轻质保温层和压型彩钢板。


6、楼面构造


多层钢结构厂房的楼板必须有足够的承载力、刚度和整体性。当前主要采用以下两种形式:
               
(l)压型钢板组合楼盖:这种楼盖的具体做法是在钢梁上铺设压型钢板,再浇注100~150mm的钢筋混凝土板,压型钢板与钢梁之间用栓钉连接。设计时如考虑钢梁和楼板的组合作用,则次梁设计的用钢量将比不考虑组合时节省25~30%,且能有效降低梁高,提高楼层净空,这种设计方法将有效降低多层厂房的总用钢量。
               
(2)预制板叠合层组合楼盖:这种楼盖的具体做法是钢梁上铺设预应力钢筋混凝土薄板,再浇注100~150mm的钢筋混凝土板,这种做法由于省去压型钢板而使总造价大为降低,是一种有广泛应用前景的楼面结构。


7、基础形式
               
多层轻钢厂房的基础多采用柱下独立基础,条形基础,十字形基础,如场地土条件较差可采用片筏基础或桩基础。基础梁多用现浇或预制混凝土梁,也可采用钢基础梁,但通常将埋置在地面以下的柱脚和钢梁外包混凝土,以解决防腐问题。

 
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