DFCCIL_CE _Quiz 31

In a prestressed beam carrying an external load 500 kN with a bent tendon is having angle of inclination  and prestressed load 200 kN. The net downward load at the centre is

A concrete beam is prestressed by a cable carrying an initial prestressing force of 800 kN. The cross sectional area of the wires in the cable is 400 mm². Calculate the percentage loss of stress due in the cable due to shrinkage of concrete using IS: 1343 recommendations assuming the beam to be pretensioned. Assume modulus of elasticity of steel, E_s = 200 kN/mm², age of concrete at transfer is 8 days and total residual shrinkage strain in pretensioned beam= 3x10^-6.

In a pre-stressed member, it is advisable to use

A concrete beam is post tensioned by a cable carrying a prestress of 900 N/mm². At the jacking end, the slip was observed to be 8 mm. Find the percentage loss of stress due to anchorage slip if length of the beam is 20 m. Take E_s = 210 KN/mm²