Question

Q1. A two-storey building is braced against the horizontal load in both directions. The column for the second storey is shown in Fig. Q1. The floor-to-floor height for each storey is 3.5 m. Each beam connected to the column is 5 m long. The sizes of beam A and beam B are 250 x 400 and 300 x 500 mm respectively. The design axial load is 2000 kN. The design end moments about the major axis, which cause the column bent in single curvature, at the top and bottom are 150 kN.m and 250 kN.m respectively Assume C30/37 Concrete, grade 500 steel, 30-mm cover to main bar, and the effective creep ratio af-09. (a) Check whether the column for the second storey is slender or short (b) Design the main reinforcement for this column using design chart. Symmetrical arrangement of reinforcement is assumed. Beam B eam A Beams A 500 mm 450 mm Base Fig. Q1

Answer 1

rt LeH 이 ormm 450mm (Amaller width

ratio 0 35ơo Spo (d:large width = 510 mm et Then, Rhort, --(D Colu mn the Co%)) wheste = 450 X500-Ast

Now 0.6 506 A -> 3 20,24%t 1330000 = ト31) Let as Provide 6-25 and 4-2。 s nment 09