Question

answered to receive full credit. 3. (20 pts) For the L-section beam as shown in Fig- ure 3 which is subjected to a positive bending moment about the z-axis of 90 kN·m, determine 1. (20 pts) Consider the beam with loading shown in Figure 1. (a) Draw the shear and moment diagrams. (a) the location of the centroid (2,P) relative (b) If the beam is constructed from A-36 struc- tural steel, determine the minimum top and bottom section modulii such that the beam does not exceed the yield strength with a to the origin O (b) the second moment of area about the z-axis passing through the centroid of the compos ite section, beam, and the beam factor of safety of 1.50. (c) the normal bending stress at the top of the 2.5 kips/ft 15 kips (d) the normal bending stress at the bottom of ー20 mm Figure 1: Beam with loading. 20 mm z $- 2:00 mm 2. (10 pts) Determine the maximum allowable bending moment about the z-axis that an A- 36 steel circular cross-section beam with dimen- sions as shown in Figure 2 can withstand without yielding. 300 mm- Figure 3: L-section beam with bending moment Rectangular Area 6 in- A=bh 8 in Figure 2: Rectangular cross-section beam Figure 4: Geometric properties. Scond Mo-ent st Area ol

Answer 1