A floor slab of thickness, $$t$$ is cast monolithically transverse to a rectangular continuous beam of span $$L$$ and width $$B.$$ If the distance between two consecutive points of contraflexure is $${L_0},$$ the effective width of compression flange at a continuous support is

A reinforced concrete member is subjected to combined action of compressive axial force and bending moment. If $${\varepsilon _{\min }}$$ is the least compressive strain in the member $${f_y},$$ the yield stress of steel and $${E_s},$$ the modulus of elasticity of steel, the maximum permissible compressive strain in concrete member will be

If $$\phi \, = \,$$ nominal diameter of reinforcing bar, $${f_s}\, = $$ compressive stress in the bar and $${f_{bd}}\, = $$ design bond stress of concrete, the anchorage length, $${L_a}$$ of straight bar in compression is equal to

The loss of prestress due to elastic shortening of concrete is least in