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Zero Error and Correct Way to Measure Length

Which of the ...

Question

Which of the following statement is not correct as per IS 456 : 2000 ?
1. The development length for bundled bars shall be that for individual bars, increased by 10% for two bars in contact.

2. The anchorage length for a standard U-type to hook is 16 times the diameter of bar.

A

1 only

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B

2 only

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C

Both 1 and 2

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D

Neither 1 nor 2

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Solution

The correct option is D Neither 1 nor 2
Both statements are correct as per IS : 456 - 2000.

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Q. As per IS 456:2000 for M20 grade concrete and plain bars in tension the design bond stress

τ_{b d}

=1.2 MPa. Furthur, IS 456:2000 permits this design bond stress value to be increased by 60% for HYSD bars. The stress in the HYSD reinforcing steel bars in tension,

σ_{s} = 360

MPa. Find the required development length,

L_{d}

, for HYSD bars in terms of the bar diameter,

ϕ .

Q. The development length required for Fe250 reinforcing bars of 20 mm diameter, as per IS 456:2000 Code for M20 grade concrete and having bars in compression with design bond stress

τ_{b d} = 1.2 M P a

, is nearly equal to ____ mm. (Nearest integer value)

Q. Which of the following statements are correct?

1. Splices in flexural members should not be at sections where the BM is more than 50% of the moment of resistance.
2. Normal lap splices can be used for all types of bars irrespective of the sizes.
3. Where bars of two different diameters are to be spliced, the lap length shall be calculated on the basis of the diameter of the smaller bar.

Q. Assertion (A): The development length for HYSD Fe 415 bars is less than that for mild steel plain bars.

Reason (R) : The permissible bond stress for HYSD Fe 415 bars is more than that for mild steel plain bars.

Q. A column of size

300 m m \times 300 m m

is provided with minimum steel of minimum diameter as per IS 456 : 2000 guidelines. The number of bars provided will be:

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