If a rectangular prestressed beam of an effective span of 5 meters and carrying

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Question
If a rectangular prestressed beam of an effective span of 5 meters and carrying a total load 3840 kg/m, is designed by the load balancing method, the central dip of the parabolic tendon should be
Options
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm
E. 25 cm

Correct Answer

10 cm

RCC Structures Design problems

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1. If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is
Options
A.
B.
C.
D.
E. All the above.

2. Pick up the true statement from the following:
Options
A. Plain ceiling provides the best property diffusing light
B. In the absence of beams, it is easier to install piping
C. In the absence of beams, it is easier to paint
D. A flat slab is capable to withstand concentrated loads
E. All the above.

3. A simply supported beam , 6 m long and of effective depth 50 cm, carries a uniformly distributed load 2400 kg/m including its self weight. If the lever arm factor is 0.85 and permissible tensile stress of steel is 1400 kg/cm², the area of steel required, is
Options
A. 14 cm²
B. 15 cm²
C. 16 cm²
D. 17 cm²
E. 18 cm²

4. Pick up the incorrect statement from the following. The intensity of horizontal shear stress at the elemental part of a beam section, is directly proportional to
Options
A. shear force
B. area of the section
C. distance of the C.G. of the area from its neutral axis
D. moment of the beam section about its neutral axis
E. width of the beam.

7. If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm² and 1400 kg/cm² respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
Options
A. 0.496%
B. 0.596%
C. 0.696%
D. 0.796%
E. none of these.

8. If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than
Options
A.
B.
C.
D.

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