例题: 4、已知:框架计算简图,用D值法计算内力并绘制弯矩图 解: 1 )求各柱的剪力值
2 )求出各柱的反弯点高度 yh
3)求各柱的柱端弯矩 第三层 MCD=12.800.413.3kN·m=17.32 kN·m MDC=12.800.593.3 kN·m =24.92 kN·m MGH=13.900.453.3 kN·m =20.64 kN·m MHG=13.900.553.3 kN·m =25.23 kN·m MLM=10.290.353.3 kN·m =11.88 kN·m MML=10.290.653.3 kN·m =22.07 kN·m 第二层 MBC=34.720.503.3 kN·m =57.29 kN·m MFG=47.800.503.3 kN·m =78.87 kN·m MCB=57.29 kN·m MGH=78.87 kN·m MJL=28.480.453.3 kN·m =42.29 kN·m MML=28.480.553.3 kN·m =51.69 kN·m
第一层 MAB=56.680.553.9 kN·m =121.6 kN·m MEF=77.510.553.9 kN·m =166.3 kN·m MBA=56.680.453.9 kN·m =99.47 kN·m MFE=77.510.453.9 kN·m =136.0 kN·m MIJ=57.560.5753.9 kN·m =129.1 kN·m MJI=57.560.4253.9 kN·m =95.41 kN·m
4)求各横梁梁端的弯矩 第三层 MDH= MDC=24.92 kN·m MDH=25.23 kN·m =16.45 kN·m MHM=25.23 kN·m =8.776 kN·m MMH= MML=22.07 kN·m 第二层 MCG= MCD+ MCB =17.32 kN·m +57.29 kN·m =24.92 kN·m MGC=(20.64+78.87) kN·m =62.65 kN·m MGC=(20.64+78.87)kN·m =36.86 kN·m MLG= MLM+ MLJ =11.88 kN·m +51.69 kN·m =63.57 kN·m
第一层 MBF= MBC+ MBA =57.29 kN·m +99.47 kN·m =156.8 kN·m MFB=(136.0+78.87)kN·m =143.2 kN·m MFJ=(136.0+78.87)kN·m =71.62 kN·m MJF= MJL+ MJI =42.29 kN·m +95.41 kN·m =137.7 kN·m
5)绘各横梁与柱的弯矩图(单位:kN·m) 如下图所示
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