Design a rectangular section for the beam using the loads and a steel ratio of half the rho balanced. Beam weights are not included in the loads given. Show sketches of cross sections including bar sizes, arrangements, and spacing. Assume concrete weighs 23.5 kN/m3, fy = 420 MPa, and f’c = 28 MPa.

As a design engineer you are asked to peer review the design done by another engineer at your organization. A typical reinforced concrete floor slab plan is given. Assume all members to be simply supported. The specified compressive strength of concrete is 5000 psi and Grade-60 steel is used. Unit weight of concrete can be assumed as 150 lb/ft³. B 30'-0"- B2 -EQ.- EQ. -EQ. SEC 1 -40'-0" IS B1 B3 B3 B1 2 The only dead load acting on the slab is the self-weight of the members. The live load on the slab is 100 psf. Initial cross-section and reinforcement details of beam B1 is shown. Area of steel is 4.8in². EQ. 40'-0" B EQ. North

rectangular beam 250 mm wide, 500 mm deep is reinforced at the bottom with 4-20-mm-diameter bars and at the top with 2-16-mm bars. Concrete cover to bar centroid at the top is 80 mm and at the bottom is 70 mm. Use concrete strength f’c = 21 MPa and steel yield strength fy = 420 MPa for 20-mm bars and fy = 275 MPa for 16-mm bars. Determine the maximum steel area for a tension controlled singly reinforced condition in positive bending

Determine the additional longitudinal reinforcements (mm2) due to torsion of a rectangular beam with a width of 469 mm and an over-all depth of 632 mm. It is subjected to a factored torsion of 110 kN-m. The specified compressive strength of concrete is 21.70 MPa. The yield strength of tension reinforcements and stirrups are 348 MPa and 278 MPa respectively. Use 12 mm stirrups. Round off only on your final answer (3 decimal places).