Civil Engineering - RCC Structures Design - Discussion

Discussion Forum : RCC Structures Design - Section 1 (Q.No. 1)
1.
In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:
6 legged
8 legged
10 legged
12 legged
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
75 comments Page 1 of 8.

Mallaya PVS said:   5 years ago
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.

Pashupati Bhatt said:   2 years ago
Footing essentially acts 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 reinforcement 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.
(9)

Shambhoo Kant Jha said:   8 years ago
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.

DALISHA said:   8 years ago
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.

Rahul Kumar said:   9 years ago
In case of combined footing, if nominal shear stress greater than design shear strength. We can provide 10 or 12 mm legged stirrup.

Heeenu said:   4 years ago
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.
(40)

Ms.Aboli Rajendra Shinde said:   5 years ago
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.
(6)

Vikash kumar said:   1 decade ago
Yes as our knowledge it true but sometimes in case of combined footing under axial loading it will be 8 legged.

Pavi said:   6 years ago
If the shear stresses not more than 5 kg/cm^2 = 8 legged stirrups.
Shear stress more than 5kg/cm^2 = 12 legged.

P.Mitra said:   10 years ago
It depends on the value of shear stress, position of works, dimension/size of the structure and reinforcements.


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