钢结构课程设计 .doc

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1、《钢结构设计原理》课程设计计算书专业班级结构10—1学生姓名艾颖金伟李卫军周颖指导教师高菲目录1、设计资料·······························································012、屋架形式与布置·························································012.1屋架的形式与几何尺寸················································012.2屋架的支撑布置·······································

2、···············023、荷载计算及荷载组合······················································023.1荷载计算···························································023.2荷载组合···························································034、内力计算及内力组合······················································045、桁架杆件设计···

3、·························································046、节点设计································································136.1下弦节点“A”·························································136.2上弦节点“B”························································156.3屋脊节点“C”····················

4、····································176.4支座节点“D”························································19附录A内力组合表···························································23附录B·桁架杆架选择表······················································241、设计资料某车间跨度21m，如图1所示，柱距为6m，厂房总长度为90m，车间内设有一台50t、一台20t中级工

5、作制软钩桥式吊车，冬季室外最低温度-20度，屋面采用1.5mx6.0m预应力大型屋面板，屋面坡度为i=1:10，上铺80mm厚泡沫混凝土保温层和二毡三油防水层，屋面活荷载标准值0.7Kn/m2,雪荷载标准值0.5Kn/m2，积灰荷载标准值0.75Kn/m2.桁架采用梯形钢桁架，其两端铰支于钢筋混凝土柱上，上柱截面尺寸450mmx450mm,混凝土强度等级为C25.钢材采用Q235B级，焊条E43型，手工焊。屋面基本资料：屋面均布活荷载标准值0.7Kn/m2雪荷载标准值0.5Kn/m2积灰荷载标准值0.75Kn/m2风荷载标准值0.45Kn/m2混凝土抗压设计强度12.5N/mm2.2、屋架

6、的形式与布置2.1、屋架形式及几何尺寸因屋面采用预应力屋面板，屋面坡度i=1:10,故宜采用梯形屋架。屋架计算跨度应取l’=l-2X150,屋架尺寸如图：屋架计算跨度：L0=L-300=20700mm屋架端部高度H0=2005mm屋架跨中高度：H=H0+L0/2i=3040mm图2.1桁架的形式与几何尺寸2.1、支撑布置根据车间长度，屋架跨度，荷载情况，以及吊车设置情况，宜布置三道上下弦横向水平支撑，垂直支撑和系杆，屋脊节点及屋架支座处沿厂房通长设置刚性系杆，屋架下弦沿跨中通长设一道柔性系杆。图2.2桁架的支撑布置3、荷载计算及荷载组合3.1、荷载计算屋面均布活荷载与雪荷载不会同时出现，从

7、资料知屋面均布活荷载大于雪荷载，故计雪荷载。永久荷载标准值：屋架沿水平投影面分布的自重：0.117+0.011L=0.117+0.011x21=0.348KN/m2预应力混凝土大型屋面板1.4KN/m2二毡三油防水层0.35KN/m220mm厚找平层0.02m20KN/m3=0.4KN/m280mm厚泡沫混凝土保温层0.08m6KN/m3=0.48KN/m2永久荷载标准值总和：2.978KN/m2可变荷载标准值：屋面均布