Examveda

# A pre-stressed rectangular beam which carries two concentrated loads W at $$\frac{{\text{L}}}{3}$$ from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is

A. $$\frac{{{\text{WL}}}}{{\text{P}}}$$

B. $$\frac{{{\text{WL}}}}{{2{\text{P}}}}$$

C. $$\frac{{{\text{WL}}}}{{3{\text{P}}}}$$

D. $$\frac{{{\text{WL}}}}{{4{\text{P}}}}$$

This Question Belongs to Civil Engineering >> RCC Structures Design

1. Reaction Ra = W.

Reaction Rb = W.

Bending Moment at Center of the Beam = [W * (L/3 + L/6) ]-[W* (L/6) ].

= WL/3.

Now Moment due to prestressing force = P*h (h= maximum dip).

Dip required => P*h = WL/3.

Therefore h = WL/3P.

2. 2

Related Questions on RCC Structures Design

If the shear stress in a R.C.C. beam is

A. Equal or less than 5 kg/cm2, no shear reinforcement is provided

B. Greater than 4 kg/cm2, but less than 20 kg/cm2, shear reinforcement is provided

C. Greater than 20 kg/cm2, the size of the section is changed

D. All the above