GATE CE 2020 RCC & PSC Quiz 4

A reinforced concrete column contains longitudinal steel equal to 1 percent of net cross–sectional area of the column. Assume modular ratio as 10. The loads carried (using the elastic theory) by the longitudinal steel and the net area of concrete, are P_s and P_s respectively. The ratio of P_s/P_c expressed as percent is

The allowable load carrying capacity of circular column section 400 mm diameter reinforced with 3245 mm² steel with bars adequately tied with spirals based on working stress method, is ____kN.
[Use M 25 grade of concrete and Fe415 grade of steel, assume short column]

The punching shear stress (in/mm²) of a square spread footing to carry a column load of 1400 kN from a 400 mm square tied column containing 20 mm bars as the longitudinal steel is
[Take bearing capacity of the soil as 100 kN/m². Assume effective depth of footing 600 mm. Use M25 grade of concrete and Fe415 grade of steel and load factor = 1.5]

A concrete column carries on axial load of 450 kN and a bending moment of 60 kN m at its base. An isolated footing of size 2 m by 3m, with 3m side along the plane of the bending moment, is provided under the column. Centres of gravity of column and footing coincide. The net maximum and the minimum pressures in kN/m² on soil under the footing are respectively.