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Question

The development length in compression for a 20 mm diameter deformed bar of grade Fe 415 embedded in concrete of grade M 25 whose design bond stress is 1.40 N/mm2, is

A
1489mm
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B
1289 mm
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C
806 mm
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D
645 mm
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Solution

The correct option is D 645 mm
(d)
According to clause 26.2.1 of IS 456: 2000
The development length is Ld given by

Ld=ϕσs4τbd

For deformed bars τbd shall be increased by 60%.
For bars in compression τbd shall be increased
by 25%.

Ld=20×0.87×4154×1.4×1.6×1.25

=645mm

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