### Discussion :: Steel Structure Design - Section 1 (Q.No.3)

Eng Chetra said: (Nov 24, 2013) | |

Could you explain about secant formula ? |

Santnosh said: (Jun 3, 2015) | |

Max allowable stress can be found by decant formula. |

Ganesh said: (Oct 26, 2015) | |

Euler's formula is valid up to 80 and for more than that we uses the secant formula. |

Divya said: (Apr 17, 2016) | |

In IS-800 2007 , Perry Robertson formula has been given. |

Himansu said: (May 24, 2016) | |

It should be an Euler's formula. |

Summn Sarkar said: (Jun 15, 2016) | |

Which one is the right answer? |

Shailza said: (Aug 6, 2016) | |

Why not Merchant-Rankine formula? |

Himanshu said: (Nov 16, 2016) | |

You are right @Divya. |

Suriya Janak said: (Dec 22, 2016) | |

Its B, as per IS 800:1948 for maximum permissible com stress merchant Rankine formula is used. |

Priyangan said: (Dec 22, 2016) | |

Yes, you are right @Himanshu. |

Sourav said: (Mar 6, 2017) | |

In IS800;2007 Perry Robertson formula has been adopted. |

M.Patel said: (Mar 8, 2017) | |

Rankine formula is the correct answer. |

Sree Vaishnavi said: (Apr 27, 2017) | |

I think as per IS 800 : 2007 cl: 7.1.2.1 Euler's formula is adopted. |

Sonu said: (Apr 28, 2017) | |

According to me, Option E is correct. |

Vaibhav said: (May 5, 2017) | |

The correct answer is Merchant-Rankine formula. Secant formula was correct according to previous IS codes IS 800:1962. But after that secant formula has been dropped in next IS code IS 800: 1984. |

Ashish said: (May 16, 2017) | |

Perry Robertson formula according to IS CODE 800- 2007. |

Rockii said: (Oct 21, 2017) | |

Perry Robertson formula according to IS CODE 800- 2007. |

Munna Yadav said: (Oct 24, 2017) | |

According to Indian standard institute perry Robertson formula & according to British standard institute Secant formula adopted. |

Faizan Raza Khan said: (Nov 22, 2017) | |

1. Secant formula was used in earlier version of IS:800 prior to 1984. 2. IS:800-1984 recommended Merchant-Rankine formula. 3. IS:800-2007 recommend the Perry Roberston formula (see clause 7.1.2.1, pg no-34 of IS:800-2007). |

Garry said: (Jan 17, 2018) | |

I agree @ Faizan Raza Khan. |

Dharshit said: (Jan 18, 2018) | |

Rankine merchant is correct. |

Deven Negi said: (Feb 21, 2018) | |

Perry robertson is the correct answer. |

Ramesh said: (Mar 6, 2018) | |

Secant is correct. Because we get modulus of elasticity up to proportionality limit. So up to lower yield point we secant modulus of elasticity and beyond limit, we get tangent modulus. Is code all other have a modulus of a tangent. |

Abhishek Singh said: (Jul 23, 2018) | |

Option C is correct. |

Raj said: (Sep 14, 2018) | |

IS 800 -1984 Rankine merchant formula. |

Sumit Bagul said: (Dec 28, 2018) | |

Rankien's formula is correct. |

Shriram said: (Jul 1, 2019) | |

Merchant Rankine formulae recommend by IS :800-1984. |

Divyaraj said: (Jan 26, 2020) | |

Perry robertson according to is 800 2007 and merchant rankine according to is 800 2000. |

Harsh Shukla said: (Jul 31, 2020) | |

For allowable stress - Merchant Rankine. For design stress - Perry Robertson. |

Pankaj Verma said: (Sep 17, 2020) | |

For steel column, Perry Robertson but for RCC and concrete column secant formula used. |

Chetan said: (Oct 2, 2020) | |

Perry Robertson is used in European codebooks and secant is used in Indian codebook. They have asked Indian standard institution so the given answer is correct. |

Nigowi said: (Oct 11, 2020) | |

According to Indian standard, it is Perry Robertson and according to British, it is Secant formula. The version of IS 800 before 1984, it was Secant formula for Indian standard. In the 1984 version, it was Merchant Rankine formula. But the latest version, in IS 800 2007, it is Perry Robertson formula. Therefore the correct answer is E. |

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