钢结构屋架计算书21m跨.doc

《钢结构屋架计算书21m跨.doc》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、目录1设计资料·······················································21．1结构形式······················································21．2屋架形式及选材················································22支撑布置······················································22．1桁架形式及几何尺寸·······························

2、·············22．2桁架支撑布置如图··············································33荷载计算······················································43内力计算······················································55杆件设计·······················································65．1上弦杆····························

3、····························75．2下弦杆·························································85．3端斜杆aB······················································85．4腹杆···························································95．5竖杆···························································96

4、节点设计·······················································126．1下线节点······················································126．2上线节点······················································136．3屋脊节点······················································146．4支座节点······························

5、························156．5下线中央节点··················································167参考文献·······················································191、设计资料1．1结构形式某厂房的跨度为21m，长度60m，柱距6m。车间设有两台30/5吨中级工作制吊车。梯形屋架，屋架端高为1.7m，屋面坡度为1/9，屋架支撑在钢筋混凝土柱上，柱的截面为400×400mm，混凝土标号为C25；计算温度最低-20℃，采用1.5×6m预应力

6、钢筋混凝土大型屋面板和卷材屋面。屋面做法：三毡四油绿豆防水层，20mm厚1:3水泥砂浆找平层，80mm厚泡沫混凝土保温层。屋面活荷载标准值0.5KN/M2，雪荷载标准值0.5KN/M2，积灰荷载标准值0.5KN/M2。由于屋面坡度小、重型屋面，不考虑风荷载。1．2屋架形式及选材屋架跨度为21m，屋架形式、几何尺寸如图附图所示。2支撑布置2．1桁架形式及几何尺寸布置图1梯形钢屋架形式和几何尺寸2．2桁架支撑布置根据厂房长度、跨度及荷载情况，设置两道上、下弦横向水平支撑。因柱网采用封闭结合，厂房两端的横向水平支撑设在第一柱间。在所有柱间的上弦平面设置了刚性和柔性系杆，以保

7、证安装时上弦杆的稳定，在各柱间下弦平面的跨中及端部设置了柔性系杆，以传递山墙风荷载。在设置横向水平支撑的柱间，于屋架跨中和两端各设一道垂直支撑。梯形钢屋架支撑布置如图1．2所示。3荷载计算屋面荷载和雪荷载不会同时出现，计算时，取较大的荷载标准值进行计算。故取屋面活荷载0.5KN/m2进行计算。屋架沿水平投影面积分布的自重（包括支撑）按经验公式gk=(0.12+0.011l)KN/m2计算，跨度单位为米（m）。荷载计算表荷载名称标准值（kN/m2）设计值（kN/m2）预应力混凝土大型屋面板1.41.4*1.35=1.89三毡四油防水层0.40.4*1.