The member shown in Figure 2(a) having a rectangular cross section is designed to resist a moment of 50 N. m. In order to increase its strength and rigidity, the engincer is planning to add two small ribs at its bottom, Figure 2(b). Is this a good idea? Answer this question by determining and comparing the maximum normal stress in the member for both cases.
The assembly consists of two posts AB and CD each made from material 1 having a modulus of elasticity of E1and a cross-sectional area A1, and a central post made from material 2 having a modulus of elasticity E2 and cross-sectional area A2. If a load P is applied to the rigid cap, determine the force in each material.(請注意:Free body diagram 、 Equilibrium equations 以及 Compatibility都必須清楚標示出來)
Draw the shear and moment diagrams for the following beams.(請清楚標示相關參數數值、畫出 V-及M-Diagram,不必說明如此標示或畫圖的理由:每小題錯一個扣一分,扣至分為止)