[工學(xué)]中國石油大學(xué)工程力學(xué)課件tm101sta(完整版)
【正文】 tics125 ③ The reactions due to each support are drawn and labeled on the sketch. (If the sense of a reaction is unknown, it should be assumed. The solution will determine the correct sense: A positive result indicates that the assumed sense is correct, whereas a negative result means that the correct sense is opposite to the assumed sense. ④ All relevant angles and dimensions are shown on the sketch. 2022/3/13 Kylinsoft Statics126 (3) Reactions of Supports 2022/3/13 Kylinsoft Statics127 Roller support 移動(dòng)鉸支座 2022/3/13 Kylinsoft Statics128 固定鉸支座 Smooth pin 固定端 2022/3/13 Kylinsoft Statics129 光滑圓柱鉸鏈約束 2022/3/13 Kylinsoft Statics130 2022/3/13 Kylinsoft Statics131 2022/3/13 Kylinsoft Statics132 2022/3/13 Kylinsoft Statics133 視頻 視頻 視頻 3 2022/3/13 Kylinsoft Statics134 2022/3/13 Kylinsoft Statics135 (4) Special Cases: TwoForce Bodies and ThreeForce Bodies ① Twoforce bodies(二力構(gòu)件 ) If a body is held in equilibrium by two forces, the forces must be equal in magnitude and oppositely directed along the same line of action. 如棘爪 ,不計(jì)自重時(shí)為二力構(gòu)件 2022/3/13 Kylinsoft Statics136 ② Threeforce bodies(Threeforce Principle) Three nonparallel, coplanar forces that hold a body in equilibrium must be concurrent. 2022/3/13 Kylinsoft Statics137 Sample Problem 11 用力 F拉動(dòng)壓路的碾子 。 Ⅱ direction。 MECHANICS OF MATERIALS Pirate Captain 2022/3/13 Kylinsoft Statics12 Introduction 2022/3/13 Kylinsoft Statics13 1 What is engineering mechanics? Engineering mechanics is the branch of physics that considers the action of forces on bodies or fluids that are both at rest and in motion。 (3) Equilibrium Equations 力系的平衡條件。如右下圖所示，在繩索上的作用力滿足二力平衡條件繩索不一定平衡。 2. 畫上主動(dòng)力 :拉力和重力
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