Question

The built-up beam is made of steel as shown in Figure 1. Knowing that modulus of elasticity for the steel is E = 200 GPa 150 mm 20 mm 150 mm 150 mm 10 mm M '10 mm 300 mm А Figure 1 (1) If the allowable tensile and compressive stress for the beam are allow tension = 140 MPa and o = 210 MPa. allow compression respectively, determine the maximum allowable internal moment M that can be applied Determine the corresponding radius of curvature of the beam An engineer has been asked to change the material of the beam from wood to cast iron, having o ultimate = 179 MPa, and E = 100 GPa The design of the beam will remain as per Figure 1. Determine the maximum bending moment Mthat can be applied from which the factor of safety will be 3.00. (iv) What is the implication if the bending stress obtained from Question (1) is greater then the permissible bending stress. In your opinion how to ensure that the maximum bending stress is less than the permissible stress.

Answer 1

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