RCC STRUCTURES DESIGN QUIZ

In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

20 mm

10 mm

25 mm

15 mm

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An R.C.C. roof slab is designed as a two way slab if

The slab is discontinuous at edges

It supports live loads in both directions

The ratio of spans in two directions is less than 2

The slab is continuous over two supports

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The thickness of base slab of a retaining wall generally provided, is

Width of the stem at the bottom

One half of the width of the stem at the bottom

One-third of the width of the stem at the bottom

One fourth of the width of the steam at the bottom

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A pre-cast pile generally used, is

Square

Square with corners chamfered

Octagonal

Circular

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The breadth of a ribbed slab containing two bars must be between

8 cm to 10 cm

12 cm to 15 cm

6 cm to 7.5 cm

10 cm to 12 cm

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If P kg/m² is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by

D = 0.00775 aP

D = 0.07775 aP

D = 0.775 Pa

D = 0.0775 aP

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The shear reinforcement in R.C.C. is provided to resist

Vertical shear

Horizontal shear

Diagonal tension

Diagonal compression

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An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 meters and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is

21.5 kg/cm²

8.3 kg/cm²

21.5 kg/cm²

7.6 kg/cm²

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A very comfortable type of stairs is

Open newel

Straight

Geometrical

Dog legged

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[A + (m - 1)ASC] known as equivalent concrete area of R.C.C. is given by

None of these

Ultimate load method

Modular ratio method

Load factor method

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