A simply supported concrete beam 6m long is reinforce with four-28 mm diamgram tension bars. The beam has a width of 300mm and over all depth of 400.the steel covering to the centroid of the renforcement is 70 mm fc=30mpa and fy 418mpa A .draw a stress diagram  B.compute for the ultimate capacity of the beam

A 62.6-kN vertical load P is applied at the corner of the square cross section of the steel compression member AB, which is free at its top A and fixed at its base B. Knowing that for the grade of steel used oy=345 MPa and E= 200 GPa, and using the allowable-stress method, determine the smallest allowable dimension d. B D 1.5 m The smallest allowable dimension dis mm.

2. Per ACI318-19, choose the correct value of the strength reduction factor ø for the flexural capacity of a beam with ɛ = tension face. 0.0032, where & is the strain for steel reinforcement closest to the (A)0.9 (B) 0.85 (C) 0.75 (D)0.65