工程力学 弯曲内力习题答案

1、试求图示各梁中指定截面上的剪力、弯矩值。解：题(a)A截面－QP0,bFFMabC截面－QPP,babFFMFababD截面－QPP,aabFFMFababB截面－QP0,aFFMab题(b)A截面－0Q0,MFMabC截面－0Q0,MaFMMababD截面－0Q0,MbFMMababB截面－0Q0,MFMab题(c)A截面－Q503,FqaMC截面－2Q5736,FqaMqaB截面－Q103,FqaM题(d)A截面－2Q1328,FqlMqaC截面－2Q1128,FqlMqaD截面－2Q1128,FqlMqaB截面－Q00,FM题(e)A截面－QPP2,FFMFlC截面－QP20,FFMB截面－QP0,FFM题(f)A截面－PQ02,FlFMC截面－PQ02,FlFMD截面－PQP2,FlFFMB截面－QP0,FFM2试建立图示各梁的剪力方程和弯矩方程，试画出图示各梁的剪力图和弯矩图qql/2l解：qaaqaql/2xFSql/82ql/2xMxFSxMqaqa/22aqa2aqaaFaFxFSxMqaqa/22qa/22qa/22xFSxMFaFFa解：解：q2aqaxFSxMqaqaqa2qa/22qa/22l/2ql2ql/2ql/2xFSxMql/2ql/2ql2ql/829ql/82q2qaqa2aaaxxFSMqaqa/22qaqa/22qa/22qa/22qaaaFSMqa/225qa/82qa/2qa/2xxqa/22解：解：aaaF3FFSMxx5F/34F/3F/3Fa/35Fa/3a3aq7qa/22FSM2qa23qa/22qa/222qaxxqa3qa2a2aqqFSM5qa/23qa2qa/2qa/2xx5qa/2aaqaqa/22qFSM3qa/2qa2qa/2qa/2xxqa/22