# Civil Engineering - RCC Structures Design - Discussion

### Discussion :: RCC Structures Design - Section 1 (Q.No.6)

6.

An R.C.C. column is treated as long if its slenderness ratio is greater than

 [A]. 30 [B]. 35 [C]. 40 [D]. 50 [E]. 60

Explanation:

No answer description available for this question.

 Dayanand Pathak said: (Oct 3, 2013) As per IS-456 is slenderness ratio is less then 12 then only column is called short column. This ratio is basically for Steel columns.

 Abdul Wajid said: (Feb 8, 2014) Yes. If slenderness ratio is more than 12 its a long column.

 Harshdeep said: (Apr 12, 2014) The ratio of effective length over least lateral dimension is greater than 12 then its called a long column your ratio is for steel structure.

 Harsh said: (Apr 12, 2014) In which code it is given that its 50 for long column.

 Amit Suman said: (Jun 17, 2014) Slenderness ratio less than 12 then it is termed as short column and more than 12 then it is a long column.

 Miss Rupali said: (Aug 19, 2014) I also agree with all above answers, because IS said that if slenderness ratio is more than 12 then the column is considered as long column.

 Alok Rawat said: (Aug 19, 2014) Less than 30 short column. 30 to 120 medium column. More than 120 long column.

 Mahesh said: (Sep 27, 2014) Slenderness ratio is more than 12 then the column is considered as long column I agree. But this que. Option are given 30, 35, 40, 50, 60. Then how to identify that ratio column is long?

 Sachin K said: (Oct 15, 2014) If Leff/b >12 i.e. Long column.

 Bhaguram Kumawat said: (Jan 8, 2015) I am not agree all answer because long and short column k lie slenderness ratio less and greater than 12.

 Gopal Saini said: (Mar 1, 2015) Lef/b >12 called long column and Lef/b <12 short column. But I don't know which economical column please tell me 1 circular 2 square 3 rectangular 4 octagonal.

 George K George said: (May 26, 2015) Slenderness ratio: The ratio of effective length or height of a wall, column, or pier to the radius of gyration.

 Sheetal Sharma said: (May 26, 2015) Please explain how it can be possible? I can't agree with this answer.

 Lal Kishor Yadav said: (Jun 6, 2015) Guys if Left/R min>40 then column is long. R min = Radius of gyration. So option C is correct.

 Naren said: (Aug 6, 2015) Your is wrong. Long column can be said when slenderness ratio is > 12.

 Vishwanath Charantimath said: (Sep 24, 2015) Answer for the question is, long columns slenderness ratio is greater than 60 as per is 456 2000 page 42 clause 25.3.1.

 Amaran Radha said: (Sep 24, 2015) Please anyone explain clearly how come slenderness ratio of long column is 50?

 Pankaj said: (Sep 28, 2015) It is not mentioned 50 anywhere but only greater than 12 is for long column, so 50 is not the exact option.

 Ganesh said: (Oct 23, 2015) Long column (l/b) > 12. or (l/r) > 40. l = Effective length. r = Radius of gyration. b = Least dimension. l/r is slenderness ration and it should be > 40. So 50 is the answer.

 Xavier said: (Nov 20, 2015) l/r = 50.

 Prashant said: (Jan 4, 2016) If slenderness ratio is lies between 12 - 60 then its short column. For greater than 60 it long or slender column.

 Ankit said: (Jan 5, 2016) LNG column is l/b greater than 12 or l/r greater than 40.

 Sajal said: (Feb 20, 2016) The unsupported length between end restraints shall not exceed 60 times the least lateral dimension of a column.

 Lokeswara Rao said: (Apr 11, 2016) If Leff/LLD >12 then it is a long column.

 Gulshan Kumar said: (Apr 27, 2016) Everyone is confused with slenderness ratio and ratio of effective length to least lateral dimension. You should know that both are not same. Slenderness ratio is the ratio of effective length to the radius of gyration.

 Dhamendra Meena said: (May 9, 2016) Long column (l/b) > 12 or (l/r) > 40. Where, l = Effective length. r = Radius of gyration. b = Least dimension. l/r is slenderness ration and it should be > 40. So 50 is the answer.

 Jayabrata said: (May 29, 2016) I think this answer is wrong. If slenderness ratio is >12 then it is long column & <12 is short column.

 Shukla Ji said: (Jun 6, 2016) Because the slenderness ratio related with constant 12 is for RCC column and 40 is for steel column.

 Subhankar Sarkar said: (Jun 8, 2016) L/b < 12 then short column. L/b > 12 then long column. When l/b = 12, then what is it?

 Ranjan Patra said: (Jun 24, 2016) The correct answer is 60.

 Ravi Singwal said: (Jul 3, 2016) In this questions, The language of the question should be that :-. A column is regarded as a long column if the ratio of its effective length to the least lateral radius of gyration is more, so the correct answer is 60.

 Ameer Ghaleb said: (Jul 5, 2016) Neglect slenderness if less than (34-12*M1/M2) or 40. The answer is 50.

 Vini said: (Jul 6, 2016) What is the exact answer? Can anyone tell me, In IS456-2000 page number. 42 given that 60times the least lateral dimension. But you all said that least radius of gyration. How?

 Pratysh said: (Sep 12, 2016) Slenderness ratio is the ratio of the length of a column and the least radius of gyration of its cross section. Often denoted by lambda. It is used extensively for finding out the design load as well as in classifying various columns in short/intermediate/long. Example- Short Steel column - lambda is less than 50.

 Srinu said: (Nov 18, 2016) Yes it's 60.

 Ranjit Ray said: (Dec 18, 2016) 1040 Slenderness.

 Zeeshan Ahmad said: (Dec 23, 2016) Please read the question carefully. Slenderness ratio is another thing. If slenderness ratio is less than 50 then it is short column but between 50 and 200 then intermediate column and above 200 then long column. If the ratio of the effective length of the column and least lateral dimension is less than 12 then it is a short and otherwise long column.

 Pratik said: (Dec 26, 2016) A short steel column is one whose slenderness ratio does not exceed 50; an intermediate length steel column has a slenderness ratio ranging from about 50 to 200, and its behavior is dominated by the strength limit of the material, while a long steel column may be assumed to have a slenderness ratio greater than 200 and its behavior is dominated by the modulus of elasticity of the material.

 Naresh Singh said: (Dec 30, 2016) Long column 120 greater than medium column 32-120, and short column less than 32 for steel design.

 Deep Patel said: (Jan 4, 2017) If effe Length/radius of gyration >=50 it's call long column and for mild steel it's value is 80.

 Cpv said: (Jan 30, 2017) A short steel column is one whose slenderness ratio does not exceed 50 in case of steel column.

 Ravi said: (Feb 11, 2017) L/r is greater than 40 is long column.

 Shambhoo Kant Jha said: (Feb 17, 2017) It is RCC Column. Hence, IS:456-2000 is only applicable. For long columns, SR should be more than 12 but less than 60.

 Pawan130895 said: (Mar 15, 2017) IS 456 : 2008 does not said it.

 Kunti said: (Mar 16, 2017) If it is l/r less than equal to 40 short column. Then according to question answer should greater than 40. So, answer will be 40.

 Sagar said: (Mar 25, 2017) 60 is the correct answer.

 M I Sugur said: (Apr 1, 2017) Leff/ LLD > 12 is Long column, Leff/LLD<12 is short column.

 Sugur said: (Apr 1, 2017) For steel, long column it is Greater than >50.

 Ashu Sharma said: (Apr 22, 2017) In RCC radius of gyration>12 then long column; if <12 short column. In STEEL, column radius of gyration>200 then long column; if <=50 short column; if inbetween 40-200 then intermediate column.

 Mouni said: (Apr 26, 2017) Le/D > 12 long column. OR Le/least radius of gyeration >45 lng column.

 Bikash Kabiraj said: (May 19, 2017) Short>32. Medium----32-120. Long---120.

 Falindra said: (May 29, 2017) Please, anyone give me the correct answer with the clear description.

 Salman Khan said: (Jun 16, 2017) It's answer is 60 for long columns.

 Vasantha Devi said: (Jun 20, 2017) Dear friends.. this question and Answer is for the Wooden column. but not mentioned in the question. SR = Leff /r. Where: Leff= the effective length, which depends on the boundary or end conditions (discussed later) r = the radius of gyration r = √ I/A = moment of inertia of the column Based on the slenderness ratio columns are classified as short, intermediate, and long (slender column). For example, a wooden column with a Leff /r ratio less than 11 is defined as the short column. Intermediate columns have Leff /r values in the range of 11 to 30. The columns with Leff /r value greater than 30 are defined as a long or slender column.

 Niloy Nandi said: (Jun 25, 2017) If the is column is RCC then the slenderness ratio is more than 12 then it is a long column or if it s less than 12 then it s called short column long column i b 12 or i r. If the column is steel column then slenderness ratio is more than 12 then it is a long column or If it s less than 12 then it s called short column long column i b 12 or i r.

 Sonu said: (Jul 25, 2017) I/r is slenderness ration and it should be =<40 / this is for Steel ! Remember. THIS IS FOR YOUR INFORMATION , Short RCC Column =<12. Long RCC Column >12. Short Steel column, =<50. Intermediate Steel Column >40 & <200. Long Steel Column >200.

 Sambit Kumar Singh said: (Aug 11, 2017) What is slenderness ratio?

 Abc said: (Sep 22, 2017) 50 for rcc & 80 for steel.

 Raj Chavda said: (Nov 15, 2017) There is two solution guys, 1) if Le/d>15 long column. Le/d<15 short column. where Le=total length of column and d=width. 2) Other method is to find out radius of gyration K= sqrt(I/A) where I=moment of inertia and A= Area. Le/k>50 than its long column. Le/k<50 than its short column.

 Rohitash Roj said: (Nov 30, 2017) Slenderness ratio less than 12 then it is termed as short column and more than 12 then it is a long column.

 Aman Vyapari said: (Dec 11, 2017) The question should be for Steel column. The answer 50 is correspondence with the Steel column.

 Gk Singh said: (Jan 15, 2018) FOR LONG COLUMN - Ratio of unsupported length between end restraints shall not exceed 60 times the least lateral dimension of column.

 Hariharan M said: (Jan 25, 2018) Please give a answer with the reference.

 Animesh Paul said: (Jan 29, 2018) - Short RCC column, =< 10. - Long RCC column, > 10. - Short Steel column, =<50. - Intermediate Steel column >50 & <200. - Long Steel column >200.

 Yasir said: (Mar 5, 2018) This is based on l (effective) /radius of gyration.

 Bvc said: (Mar 10, 2018) Pedestal =less than or equal to 3, Short column= between 3 to 12, Long column = 12 to 60.

 Chandan Das said: (Mar 14, 2018) @All. "The unsupported length between end restraints. Shall not exceed 60 times the least lateral dimension of a column. IN THE ABOVE LINE ITS NOT WRITTEN THAT IF IT EXCEEDS 60 THAN IT WILL BE A LONG COLUMN. ACCORDING TO IS CODE 456, PAGE NUMBER 41 CLAUSE 25.1.2 STATED THAT; "A compression member may be considered as short. When both the slenderness ratios Lex/D and Ley/b are less. Than 12". SO, SLENDERNESS RATIO IS; (EFFECTIVE LENGTH/LEAST LATERAL DIMENSION).

 Jivan Shrestha said: (Mar 21, 2018) Use IS:456-2000.

 Akash Sahoo said: (Jun 6, 2018) Short RCC Column =<12. Long RCC Column >12. Short Steel column, =<50. Intermediate Steel Column >40 & <200. Long Steel Column >200.

 Jitendra Kumar said: (Jul 20, 2018) According to IS: Code 456-1978. S.R .is less than 12 that's called a short column. And S. R. is equal to up in 12 that's called long column.

 Lovith said: (Aug 11, 2018) Yes, 40 is the right answer.

 Raj said: (Sep 4, 2018) L to lateral dimension > 12. Or. Slenderness ratio greater than 120 is a long column.

 Hannanur Rahaman said: (Sep 6, 2018) D. 50 is correct.

 Vishal said: (Apr 2, 2019) Let me clear all ur doubts, L/least dimension <3=pedestal, 3-12 = short column, 12-60= intermediate col, >60. Also; L/radius of gyration<30= short col, 30-120=intermediate col, >120.

 Swar said: (Apr 4, 2019) I think option C 40 is correct.

 Ratandeep said: (Jul 23, 2019) IS 456 2000 clause 25.3.1 explained about unsupported length, not for short/long column.

 Dibya said: (Jul 27, 2019) According to is 456 2000, for long column λ should be less than 60.

 Ashibul said: (Aug 31, 2019) L/b <= 3 pedestal. 3= 60 redesign. As per IS456: 2000.

 Amol Jadhav said: (Oct 31, 2019) According to IS 456:2000 (Clause no.25.3.1). The unsupported length between end restraints shall not exceed 60 times the least lateral dimension of a column.

 Jp17 said: (Feb 28, 2020) Yes, that means Slenderness limit should not exceed 60. Beyond that limited, a column can't be considered.

 Ajay Veer Singh said: (Apr 28, 2020) S. N ratio for short column <41 or =41. And for long column >41.

 Mallaya Pvs said: (Jun 11, 2020) As per IS 456 and SP16 (clause 3.4 of compression members) if Slenderness ratio leff/LLD is more than 12 it is a long column. For steel structures, the Slenderness ratio is Leff/r min and its limiting value is 180.

 Qamar said: (Jul 7, 2020) A short steel column is one whose slenderness ratio does not exceed 50; an intermediate length steel column has a slenderness ratio ranging from about 50 to 200, and are dominated by the strength limit of the material, while a long steel column may be assumed to have a slenderness ratio greater than 200. For RCC Column, i) When the ratio of the effective length to its least lateral dimension is less than or equal to 12 it is called as short column. . Why this is important? - Long columns under compression can fail via both bucklings (bending sideways) as well as crushing.