钢结构平台计算书.docx

钢结构平台设计说明书设计: 校核:..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................,×(平台板开洞7个,开洞尺寸460×460mm),。平台上平均布荷载为5,不考虑水平向荷载,设计全钢工作平台。:1)钢结构设计规范2)建筑结构荷载规范3)钢结构设计手册4),主梁跨度3530mm,次梁跨度2790mm,次梁间距1260mm,铺板下设加劲,间距900mm。柱间支撑按构造设计,铰接连接;梁柱铰接连接。,钢材牌号为Q235,手工焊,E4型焊条,钢材弹性模量E=×105N/mm2,钢材密度ρ=´103Kg/m3,基础混凝土强度等级为C30,fc=。=5kN/m2,5mm厚花纹钢板自重qDk=××=,,。均布荷载标准值qk=5kN/m+==×+×5=/a=1260/900=<2,取a=,平台板单位宽度最大弯矩设计值为:Mmax=αqa2=××=·mMmaxγ×W=6Mmaxγt2=6××=96000KN/m2=96N/mm2<215N/=,E=×105N/mm2va=βqka3Et3=