工程力學(xué)受力分析

例1Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.例2畫出C輪、AB桿受力圖。未畫重力物體重量均不計Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.例3畫出棘輪受力圖。棘輪重力不計Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.例4畫出

BD與輪的組合體、AC桿,及整體受力圖。未畫重力物體重量均不計Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.錯在哪里？例5畫出CB、AC桿受力圖。未畫重力物體重量均不計Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.畫出板ABC、桿ED及整體受力圖。物體重量均不計例6FAxFAyFCF'CFAxFAyFDxFDyFEFDxFDyFEEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.例7畫出整體及AB、AE受力圖。未畫重力物體重量均不計Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.E畫出E輪、AE、BC、H輪和重物P、銷釘E及整體受力圖。未畫重力物體重量均不計例8FByFBxFAyFAxFDyFDxFCxFCyAECDBHPEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.EH輪和重物P、銷釘E及整體FAyFAxFByFBxHPAECDBHPECDHPEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.F畫出AB、AD、AC、銷釘A、銷釘C及整體受力圖。未畫重力的物體的重量均不計。例9FACFABABCDEFFNBFADxFADyFExFEyFNDEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.AC銷釘A、銷釘C及整體受力圖ABCDEFABCDEFFCBxFCByFCyFCxFCxFCyFNDEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.(1)畫出構(gòu)件BC、AB、銷釘B,滑輪及重物的組合體的受力圖例10BACBDPBPFBCF'BCF'ABFABPFBxFByF'ABF'BCF'BxF'ByEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.(3)畫滑輪、重物、銷釘和構(gòu)件AB的組合體的受力圖。物體重量均不計(2)畫滑輪、重物和銷釘?shù)慕M合體的受力圖ACBDPBPPPF'BCF'ABABPF'BCF'ABEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.不計三鉸拱橋的自重與摩擦，畫出左、右拱的受力圖和系統(tǒng)整體受力圖．解：右拱CB為二力構(gòu)件，其受力圖如圖（b）所示例10Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.系統(tǒng)整體受力圖如圖（d）所示取左拱AC

,其受力圖如圖（c）所示Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011AsposePtyLtd.此時整體受力圖如圖（f）所示考慮到左拱AC

三個力作用下平衡，也可按三力平衡匯交定理畫出左拱AC

的受力圖，如圖（e）所示Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientPro.Copyright2004-2011Asp