《土木工程力学(本)》作业.ppt
七、(1)解:1.计算分配系数,2.计算固端弯矩,48kN/m,24kN,0.429,0.571,0.571,0.429,-144,144,-27,82.29,-144,61.71,41.15,-90.3,-67.85,-45.15,19.37,25.78,12.89,-7.36,-5.53,81.08,-81.08,100.38,-100.38,19.37,0,A,-81.08,100.38,八.(2)解:1.简化悬臂端,3.计算固端弯矩,2.计算分配系数,九.(1)用力矩分配法计算并做出图示结构 M 图。EI=常数,B结点,解:1.求各杆的转动刚度,设EI=1,3.计算固端弯矩,2.计算分配系数:,1KN,分配传递,最后弯矩,C,B,E,32KN,8,-14,20,0,20KN/m,20KN,-20,6,-11.43,-8.57,-3.43,-16.57,-1.22,20KN.m,20KN.m,3.43,16.57,1.22,十.(2)用力矩分配法计算图示结构分配系数与固端弯矩。EI=常数,C,A,B,P=20kN,2m,4m,D,E,2m,4m,解:1.求各杆的转动刚度,设EI=i,2.计算分配系数:,10kN/m,3.计算固端弯矩:,三用力矩分配法求图(给出分配系数和固端弯矩值)EI常数。(10分),解:,分配系数,固端弯矩,分配传递,最后弯矩,绘图,结点,结点,图(kN.m),q=10kN/m,8kN,0.5 0.5 0.5 0.5-13.3 13.3 0-4 4-3.33-6.65-6.65-3.32 1.85 3.66 3.66 1.83-0.46-0.92-0.92-0.46 0.23 0.23 0.12-17.1 5.73-5.72 0.11-0.11 4.95,分配系数,最后弯矩,固端弯矩,分配传递,4m,4m,2m,2m,六.(15分)用力矩分配法计算图示结构M图。已知,C,A,B,6m,4m,16KN/m,分配传递,最后弯矩,0.4,0.6,28.8,-48,48,-57.6,-28.8,-14.4,-9.6,-19.2,-28.8,-14.4,固端弯矩,分配系数,A,4m,6m,D,F,4m,B,C,E,2.计算分配系数:,3.计算固端弯矩:,1.按对称性简化,-57.6,28.8,14.4,14、用力矩分配法计算图示结构 M 图。EI 为常数,D,A,B,8KN,1KN,分配传递,最后弯矩,1.求分配系数,A结点,-2,2,-0.5,0,0,0,C,B,A,2.求固端弯矩,C,16、用力矩分配法计算图示结构,并作M图.。EI=常数。(12分),解:,计算分配系数,固端弯矩,分配传递,最后弯矩,绘图,结点,A,分配系数 0.5 0.5,最后弯矩,固端弯矩,分配传递,B,C,0,P,A,B,P,0,17、15分)用力矩分配法计算并做出图示结构 M 图。EI=常数,C,D,A,B,I,I,2I,8KN,6m,3m,3m,3m,A结点,解:1.求各杆的转动刚度,设EI=1,3.计算固端弯矩,2.计算分配系数:,A,B,P,18、用力矩分配法计算图示结构M图。已知,固端弯矩:,分配与传递,固端弯矩,-35.56,80,-160,由图示,可知BE杆B端的固端弯矩值为(-160)kN.m(外侧受拉),A,B,E,分配系数,最后弯矩,A,C,0,0,0,0,0,0,D,160,0,0,-35.56,-17.78,-8.89,8.89,-17.78,17.78,0,8.89,-3.95,-3.95,-1.98,-0.99,0.99,0,0,9.88,-9.88,-19.76,-39.51,49.38,160,-160,0,19.76,