Question
Download Solution PDFAs per IS 456 : 2000, the design bond stress ꞇbd in limit state method for plain bars in tension for M40 grade of concrete is _______
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Design bond stress:
- Bond stress is the result of the bonding between the concrete surface and the reinforcement steel.
- It varies depending upon the type of concrete and type of reinforcement used.
- If plane rounded steel is used as reinforcement then the bond stress will be less, if the same concrete is used with HYSD steel as reinforcement then the bond stress is higher.
- The bond between steel and concrete is mainly due to pure adhesive resistance, frictional resistance, and mechanical resistance.
According to IS 456 ∶ 2000, the design bond stress in the limit state method for plain bars in tension shall be as below:
| Grade of concrete | M20 | M25 | M30 | M35 | M40 and above |
| Design bond stress(N/mm2) | 1.2 | 1.4 | 1.5 | 1.7 | 1.9 |
Note:
- For deformed bars conforming to IS 1786, these values shall be increased by 60 percent.
- For bars in compression. the values of bond stress for bars in tension shall be increased by 25 percent.
Last updated on May 28, 2025
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