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【例题】如图所示风荷载作用下排架的计算简图,条件如下:491013.2mmIIuCuA,4101044.1mmIIlClA491020.7mmIuB4101044.1mmIlB,,,mHu1.4mH13,作用在排架上的风荷载如图所示,试用剪力分配法计算该排架内力。【解】148.0104.141013.299luIIn315.00.131.4HHu1)各柱剪力分配系数的确定A、C轴排架柱:,54.2)1148.0/1(315.013)1/1(13330nCEHEHCEIHuulCA39930310027.054.24.14105.0104.14102.799luIIn315.00.131.4HHu91.2)15.0/1(315.013)1/1(13330nCEHEHCEIHulB39930310024.091.24.1410B轴柱:,32.010024.0110027.0210027.0111393939HEHEHEuuiAAC36.032.032.011CAB各柱的剪力分配系数:2)计算各柱顶剪力先分别计算作用下的内力,然后进行叠加336.0)]1148.0/1(315.01[8)]1148.0/1(315.01[3)]1/1(1[8)]1/1(1[334349nnC77.15336.00.1361.391HCqRA52.9336.00.1318.292HCqRCWCAFRRRkN(←)则不动铰支座总反力为:=-15.77-9.52-34.35=-59.64kN(←)kN(←)R将反作用于排架柱顶,按分配系数求得排架各柱顶剪力RRVAAARRVBBBRRVCCC=-15.77+0.32×59.64=3.31kN(→)=0+0.36×59.64=21.47kN(→)=-9.52+0.32×59.64=9.56kN(→)风荷载作用下排架内力图风荷载作用下排架各柱的弯矩图、轴力图如图所示【习题】如图所示风荷载作用下排架的计算简图,条件如下:4910275.3mmIIuCuA,4910955.8mmIIlClA4910450.5mmIuB4910955.8mmIlB,,,mHu1.3mH2.12,作用在排架上的风荷载有:,,试用剪力分配法计算该排架内力。kNFW8.5mkNq/25.21mkNq/25.12
本文标题:剪力分配法例题
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