简单的超静定问题.ppt

《简单的超静定问题.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、简单的超静定问题第六章超静定问题及其解法拉压超静定问题扭转超静定问题简单超静定梁返回Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.1约束反力或杆件的内力可以用静力平衡方程求出，这种情况称作静定问题。只凭静力平衡方程已不能解出全

2、部未知力，这种情况称做超静定问题。§6-1超静定问题及其解法2、超静定问题1、静定问题Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.2未知力数超过独立平衡方程数的数目,称作超静定的次数。3、超静定的次数5、多余未知力4、多余约束多于维

3、持平衡所必需的支座或杆件。与多余约束相应的支座约束力或内力。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.3FABCDACBFFFEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5Cli

4、entProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.4DACBF一次超静定FABCFABCEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.Createdwith

5、Aspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.5§6-2拉压超静定问题一、一般超静定问题例题：两端固定的等直杆AB横截面积为A，弹性模量为E，在C点处承受轴力F的作用，如图所示，计算约束力。FblBACaEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfo

6、r.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.6FByFBFAAC这是一次超静定问题。平衡方程为FblBACaEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.7B

7、AC相容条件是：杆的总长度不变=FByFBFAACFblBACaEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011Asp