Civil Engineering - RCC Structures Design - Discussion


In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:

[A]. 6 legged
[B]. 8 legged
[C]. 10 legged
[D]. 12 legged
[E]. none of these.

Answer: Option D


No answer description available for this question.

Chotu said: (Sep 29, 2013)  
Somebody tell me the solution of this problem?

Vikash Kumar said: (Oct 25, 2013)  
Yes as our knowledge it true but sometimes in case of combined footing under axial loading it will be 8 legged.

Agraj said: (Dec 9, 2013)  
Kindly mention the concerned clause of respective is standard?

Meghna said: (Mar 2, 2014)  
Can somebody explain the reason?

Syed said: (Mar 17, 2014)  
Why we are using 8-legged?

Muhammad Haneed said: (Jun 28, 2014)  
Yes we can use 8 legged as well as 12 legged its no more effect on it.

Nana said: (Sep 4, 2014)  
Please give the reason?

Gopi said: (Sep 4, 2014)  
Can anybody explain for 12 legged stirrups under shear stress?

Shubhangi said: (Sep 13, 2014)  
Please explain how it is 12?

Rohit said: (Sep 19, 2014)  
Please give the reason ?

Shantanu said: (Sep 25, 2014)  
We cannot be precise on the diameter of bars. It varies the grade of steel.

Sandeep said: (Jan 16, 2015)  
Please explain in detailed.

Dibyendu Biswas said: (Feb 6, 2015)  
Please explain why we will provide 12 legged ? Why not 8 legged ?

P.Mitra said: (Mar 6, 2015)  
It depends on the value of shear stress, position of works, dimension/size of the structure and reinforcements.

Rajat Choudhary said: (May 11, 2015)  
Ya its depends upon shear stress values dimension of footing.

Atul Tripathi said: (Jun 8, 2015)  
Can anyone explain in detail?

Prasanth said: (Jun 10, 2015)  
Please explain this one.

Babu said: (Jul 23, 2015)  
Ya it is depends on shear stress value. If shear stress more we adopt on basis of requirements.

Amin said: (Aug 13, 2015)  
Please explain briefly.

Venkat said: (Sep 9, 2015)  
Can put any one of those depends upon stresses?

Amaran Radha said: (Sep 24, 2015)  
Can anyone explain what is shear stress practically?

Anawar &Amp; Saiful said: (Oct 5, 2015)  
Please explain this.

Srinu said: (Oct 21, 2015)  
It is combined footing n 5 exceeds so stirrups are more provided.

Pankaj said: (Nov 8, 2015)  
Somebody can explain derivation?

Benu said: (Dec 11, 2015)  
Please solve this problem.

Matiur Rahaman said: (Feb 20, 2016)  
Please solve this problem.

Rahul Kumar said: (Feb 24, 2016)  
In case of combined footing, if nominal shear stress greater than design shear strength. We can provide 10 or 12 mm legged stirrup.

Ayan said: (Apr 6, 2016)  
Please follow IS 456-2000.

Subham said: (Apr 7, 2016)  
I want the correct solution of this question.

Ranjan said: (Apr 28, 2016)  
Please explain the reason of this solution.

Sunny said: (Jun 18, 2016)  
How to calculate the solution of this problem? Please, somebody explain that.

Tamal said: (Jul 15, 2016)  
I have gone through 456 but I couldn't find it, please anyone mention the exact cause of it.

Luqman said: (Jul 22, 2016)  
Somebody can explain the derivation?

Ravi Patel said: (Jul 29, 2016)  
I have no idea to solve this question. Please explain the derivation part.

Deepak said: (Aug 12, 2016)  
Whats the reason for it?

M.K.Ajay Raina said: (Aug 25, 2016)  
I want detail and clear answer for this.

Sunil Kumar Swain said: (Sep 6, 2016)  
Please explain why are we using 12 legged stirrups?

Rahul said: (Sep 6, 2016)  
Is it depends upon grade, dia, answer size?

Dalisha said: (Oct 16, 2016)  
If shear stress does not exceed 5 then it is 4 legged but if it is exceeded then 6 or 8 legged are recommended. So, the answer 12 legged is not correct.

Radha Ksrm said: (Nov 20, 2016)  
Not getting this, Please Explain it.

Himanshu said: (Nov 29, 2016)  
In foundation, we can't provide shear stirrups we've only one choice to increase the depth of foundation.

Rajesh Nenavath said: (Dec 11, 2016)  
Please explain clearly to understand the solution.

Bhupendra Singh said: (Dec 28, 2016)  
What's the reason for it?

Shantanu said: (Jan 14, 2017)  
If shear stress exceeds 5kg/cm2 then use 12 mm and when it is less than 5 then use 8mm stirrup.

Amarsingh said: (Jan 25, 2017)  
Not getting this, somebody please explain in detail.

Shailendra Singh said: (Jan 28, 2017)  
Plz explain briefly frnd

Shambhoo Kant Jha said: (Feb 16, 2017)  
Footing essentially acting as a wide beam. Normally, in combined footing, we do not provide shear reinforcement. If nominal shear strength exceeds permissible shear strength, then its depth is increased so that nominal shear strength is less than permissible shear strength. However, Shear reinf Is provided when nominal exceeds permissible shear strength. It depends on dia, stress & spacing of stirrups. It is not fair to say 8 or 12 legged.

Avindra said: (Feb 20, 2017)  
Please give the explanation to understand this.

Mohit Singh said: (Mar 7, 2017)  
If shear stress exceeds 5kg/cm2 then use 12 mm and when it is less than 5 then use 8mm stirrup.

Vaibhavi Solanki said: (Mar 18, 2017)  
Hi, I am not getting this, Please explain it in detail.

Dinesh said: (Jun 27, 2017)  
I am not understanding please explain clearly.

Steve said: (Jul 19, 2017)  
12 legged is correct one.

Harichandra Bhandari said: (Aug 14, 2017)  
I am not understanding this. Please explain 12 legged is correct.

Sanjay said: (Oct 3, 2017)  
Yes, right. Agree @Shambhoo Kant Jha.

Puja Ray said: (Nov 23, 2017)  
Please explain this.

Rathna Roxs said: (Jan 27, 2018)  
Please explain this.

Surendra Kumar said: (Feb 22, 2018)  
Please explain this.

Navneet said: (Apr 2, 2018)  
Please explain it.

Ashok said: (May 23, 2018)  
Please anyone explain me.

S.Jayaranjanj said: (May 25, 2018)  
Explain the reason of using12 legged stirrups for combined footing.

Thakur Panwar said: (Jul 22, 2018)  
If shear stress exceeds 5kg/cm2 then use 12 mm and when it is less than 5 then use 8mm stirrup.

P.Tarun Kumar Naik said: (Jul 26, 2018)  
In case of combined footing under axial loading we can use 12 legged stirrups.

Pavi said: (Feb 25, 2019)  
If the shear stresses not more than 5 kg/cm^2 = 8 legged stirrups.
Shear stress more than 5kg/cm^2 = 12 legged.

Basu said: (Jul 25, 2019)  
Is it recommended by IS code?

Jayant said: (Sep 4, 2019)  
Explain the answer.

Vk Singh said: (Sep 16, 2019)  
If it >5 than 12.

If <5 than 8 stirrup.

Niva said: (Sep 20, 2019)  
Right, thanks @VK Singh.

Alpesh said: (Mar 29, 2020)  
If it >5 then 12.

If <5 then 8 stirrups.

Mallaya Pvs said: (Jun 10, 2020)  
The Maximum shear stress depends type of the mix used. In no way any of the max allowed shear stress are more than 4N/Sqmm. Hence The following conclusions are offered.

1. Evaluate the Shear safety criteria based on type of the mix used.

2. If the shear stress at the critical cross section of the footing is more than maximum limit specified it is advised to.

A) Increase the depth of the footing.

B) Provide a string beam to take care of the shear forces without increase of the depth of the footing.

C) If the six or 8 legged stirrups are provided to counter the shear force then the sole criteria of design should be shear stress due to residual shear =total shear force- shear capacity of the section.

Ms.Aboli Rajendra Shinde said: (Jul 13, 2020)  
If the shear stresses not more than 5 kg/cm^2 = 8 legged stirrups.

And If Shear stress more than 5kg/cm^2 = 12 legged stirrups.

Mathavakannan said: (Oct 14, 2020)  
Not getting the Answer. Please explain to me in detail.

Heeenu said: (Mar 29, 2021)  
If shear stress is greater than 5kg/cm^2 then we use 12 legged stirrups and if it less than 5kg/cm^2 then we use 8 legged striups.

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