《工程力学》试卷 A含参考答案

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※装订线《工程力学》试卷A参考答案及评分标准…………………………………………………………………………………………….注:标准答案、参考答案要点及评分标准须写清题号、每小题得分、共得分等。……………………………………………………………………………………………..一、选择题(每小题4分,共40分)1.A2.D3.C4.B5.A6.B7.A8.C9.C10.D二、计算题:(共60分)1.解:平衡方程FFF??NhNg(1)(2分)变形协调方程hhNhggNgAElFAElF?,即41NhNg?FF(2)(4分)解方程(1),(2)得kN2405Ng??FF,kN9604NgNh??FF(2分)2.解:EIFaaEIFaEIFaEIaFawB322322)2(3232????(↑)(5分)EIFaEIaFaEIFaB22)2(22?????()(5分)3.解:MPa4.7230)2060(2060221???????02??MPa4.1230)2060(2060223????????(4分)MPa4.42231max??????(3分)432111078.3)]([1???????????E(3分)4.解:对于梁AB,由maxmax[zMW?????,可求得[]8.16kN/mq?(6分)对于杆CD,3NNmax24.510,[π/4FFqd???????(6分)则2Nmin4πFd????,所以min17.1mmd?(3分)5.解:危险截面在固定端A处,(3分)mkN64.1??M,mkN4.0??T,(6分)则][MPa8.77223r??????WTM,满足强度条件。(6分)