第五章结构的位移计算作业详解LastEdit:2009.8.122/72本章课后作业3/72【作业1】等截面伸臂梁,在图示荷载作用下,求截面C的角位移jC(郑版5-2)BAEIEI40kN10kN/m6m2mC4/72BAEIEI40kN10kN/m6m2mC1)确定虚拟状态BAEIEI6m2mC12)画出实际状态和虚拟状态的弯矩图MP图(kN·m)80405M1图(kN·m)113)图乘702145632328062111y8018022122y15080702211yyyEIC150j方向:顺时针。5/72【作业2】图乘法已知各杆的EI=2.1×104kN·m2,求图示刚架铰C左右截面的相对角位移。ACB3m3m3m3m60kN40kN6/72ACB3m3m3m3m60kN40kN1)静定结构计算反力,并画出MP图AC60kN40kNFAxFAyBFBxFByFCyFCxFCxFCyByCyBxCxFFFFByBxCFFM0CB部分AC部分0363603400CyCxAFFM代入前面结果kN3100930009300BxByBxFFF考虑整体平衡kN380kN320AyAxFF7/721)静定结构计算反力,并画出MP图ACB60kN40kN20/3kN80/3kN100/3kN100/3kN8080100100DE20MP(kN·m)803406320DM206334028010033100EM8/722)确定虚拟状态,并画出M1图ACB11FCxFCyFBxFBy0133CyCxFFFCxFCy11FAyFAx0136CyCxFF92BxCxFF91ByCyFF92AxF91AyF9/722)确定虚拟状态,并画出M1图ACB12/92/91/91/94/34/32/32/3ACB60kN40kN20/3kN80/3kN100/3kN100/3kN8080100100DE20MP(kN·m)1Mrad02.03101.21270)31270(1)342180621343280621)3432131(80321)3232131(1003213232100321[1Δ4EIEIj3)图乘求解10/72【作业3】组合结构如图示荷载作用下,已知链杆BE的轴向刚度EA=EI/4(1/m2)其余为受弯杆件,EI=常数求C点的水平位移DCH(郑版5-17)6m2m4m2mABCDE30kN10kN/m11/726m2m4m2mABCDE30kN10kN/m1)求反力EB二力构件60kN40kN70kN0kN2)画出MP图计算MDCMDEMDA2001210DCDCMM1800670830DEDEMM16002410460DADAMMABCDE16018020205MP(kN·m)-70kN6018012/723)确定虚拟状态,并画出M1图ABCDE16m2m2m4m1110642-1M1(m)4)图乘ABCDE16018020205MP(kN·m)-70kN60180EIEIEIEAEIΔC39002804)180020960(1)1704(1)]63160621632618021()1523223221220()220432324211604[(1H方向向右13/72【作业4】等截面刚架各杆截面均为矩形,截面高度h=0.25m,材料线膨胀系数为a,试求B的水平位移DBH,和横梁中点C的竖向位移DCV。(郑版习题5-21)ABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m14/72【作业4】等截面刚架各杆截面均为矩形,截面高度h=0.25m,材料线膨胀系数为a,试求B的水平位移DBH,和横梁中点C的竖向位移DCV。(郑版习题5-21)ABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m15/72ABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m1)确定虚拟状态。2)画出虚拟状态下的弯矩图,轴力图(受弯构件在温度变化影响下,必须考虑轴力。)DBHAB11AB11440.60.61(m)16/72DBHAB11440.60.61(m)ABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m受弯构件202210ttt521525ΔtDDMiihttBaaN0H)(520)4422154(525.0]4126.05[20HDaaaB17/72ABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m1)确定虚拟状态。ABC10.50.52)画出虚拟状态下的弯矩图,轴力图(受弯构件在温度变化影响下,必须考虑轴力。)ABC10.50.51.51.52.5M1(m)-0.8-0.80DCV18/72受弯构件202210tttABCt1t2t1t2t1=25℃t1=15℃3m3m2m2m4m521525ΔtDDMiihttCaaN0V)(470)211445.1215.152(525.025)8.0(20VDaaaCABC10.50.51.51.52.5M1(m)-0.8-0.8019/72本章完谢谢听讲