Question

2) The beam with centroid C is loaded by an unsymmetric bending moment as shown. (a) Determine the normal stress due to bending at A (b) Mark the N.A on the cross-section 3.4 in 2 in 6 in + 0.75 in. AT 3 in. 3001 0.75 in. B 500 lb.in

Answer 1

Given data; Y Gin vain (0) ID 25'n sin 14 30 30-3570 13 50016.ph Calwlation of Ixx and Iyy: 2 3 ix0.75 + 6*0.75*(1.5-0.5x8.759 + * It [] + [470 3 5*(1.5- [cxovret + -- 9,237 Iul: 16.3125 ina Ir

2 2 3.4) Iyy + 3x2 x 1 0.7586 s x6² +0.75*6* 6.3.4) 12 lyy: 65 int * my -500 * sin 300-250 lb.in my - +500 * (OJ 30 : +433:01 Ibapo 1 stress @ point Ar y + my ma o Ix ly 433-01 % (-105+0.75)-250 16.3125 65 19.91 +6:15 x 1-3+1-4) SA 26.06 si

b position of xha Y Ir mx y + my x=0 Iy anß: Ix cmy mx fg i? op X 10 z - 250 x 16.3125 ų 33 01x65 Y Oilua B = 8.200 Thank you