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Question
When HYSD bars are used in place of mild steel bars the bond strength.
tc gYds LVhy ckj ds LFkku ij HYSD ckj dk mi;ksx fd;k tkrk gS rks ca/u 'kfDr c<+ tkrh gS
A.
Increases
B.
Decreases
C.
Does not change
D.
Become zero
Answer ( Option A)

Increases

Solution

HYSD are deformed bar, the actual contact area of a bar increases as compared to contact area based on nominal diameter hence bond strength increases if we use HYSD bars in place of mild steel bars.
Note: Allowable bond stress is increased by 60% for deformed bars.
• Increase in allowable bond stress reduces the development length requirement
Where, Φ = Nominal dia of the bar
            σs = Stress in bar at the section considered at design load
            τbd = Design bond stress
• The above formula is applicable for mild steel bar in tension.
• For bars in compression,  in increased by 25 percentage.

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