shows a cross-section of a simply supported concrete beam, spanning 6.1m. calculate the maximum point load that the beam can carry at its midspan, if the maximum allowable bending stress is 7.5 MPa derive a formula to calculate the maximum bending moment M (kNm), of a simply supported beam carrying a uniformly distributed load, w (kN/m), at midspan, of span L (m). 4.1 4.2 100 250 250 100 3 x 50 VOIDS R180 50 50 420 210