What is shear centre importance in steel structure?
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Answered by
6
Note:- I am not an expert. I am student of Structural Engineering. So my answer may have error or mistake.
Shear Center is a point through which if the external load passes, then there will not be any twisting of the section. In other words, section will only be subjected to bending. It won't be subjected to Torsion.

( Torsion due to Load being applied at a distance eccentric to the shear center)

(No Torsion, Only Bending due to load being applied at the shear center)

( Torsion due to Load being applied at a distance eccentric to the shear center)
In general, Shear center lies on the axis of symmetry. So for doubly symmetric section shear center lies at the intersection of the two axes of symmetry. Thus for doubly symmetric sections, shear center coincides with the centroid. If the section has only one axis of symmetry then shear center will lie on that axis at distance eccentric to the non-symmetric axis.
In order to determine the position of shear center, the direction of shear flow in a section needs to be known. For most of the regular sections the shear flow is smooth and logical. In other words, the direction of shear flow doesn't get changed abruptly. There are examples where the direction of shear flow changes abruptly.
Some important points :-
1) Shear is taken up by the elements which are parallel to the direction of applied shear.
2)The direction of shear flow in the elements parallel to the applied shear is always in opposite direction to that of applied shear.
3) For a shear acting in the direction parallel to the axis of symmetry, there will be point/s where shear flow will either converge or diverge. Such points can either be called as source or sink. Such points are located at the intersection of the axis of symmetry (passing through the centroid) with the section.
4)The value of shear flow is zero at the points where cross section is open to air..
I hope it help you
Shear Center is a point through which if the external load passes, then there will not be any twisting of the section. In other words, section will only be subjected to bending. It won't be subjected to Torsion.

( Torsion due to Load being applied at a distance eccentric to the shear center)

(No Torsion, Only Bending due to load being applied at the shear center)

( Torsion due to Load being applied at a distance eccentric to the shear center)
In general, Shear center lies on the axis of symmetry. So for doubly symmetric section shear center lies at the intersection of the two axes of symmetry. Thus for doubly symmetric sections, shear center coincides with the centroid. If the section has only one axis of symmetry then shear center will lie on that axis at distance eccentric to the non-symmetric axis.
In order to determine the position of shear center, the direction of shear flow in a section needs to be known. For most of the regular sections the shear flow is smooth and logical. In other words, the direction of shear flow doesn't get changed abruptly. There are examples where the direction of shear flow changes abruptly.
Some important points :-
1) Shear is taken up by the elements which are parallel to the direction of applied shear.
2)The direction of shear flow in the elements parallel to the applied shear is always in opposite direction to that of applied shear.
3) For a shear acting in the direction parallel to the axis of symmetry, there will be point/s where shear flow will either converge or diverge. Such points can either be called as source or sink. Such points are located at the intersection of the axis of symmetry (passing through the centroid) with the section.
4)The value of shear flow is zero at the points where cross section is open to air..
I hope it help you
Answered by
0
As already informed by Dr Sankara Gullapalli, shear centre(SC) is determined based on the shape of the section .
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