What is one way and two way shear punching shear?
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What is one way and two way shear punching shear?
One way shear is rate of change of bending moment. It’s typically called beam shear. However two way shear is punching shear and its effect is two way. It’s also called flat slab shear. You can press your Palm with pen to visualize two way shear.
What is two way shear in footing?
Concept: Two way/punching shear: It shall be checked around the column a perimeter half the effective depth of footing slab away from the face of column or pedestal. The critical section for two-way shear or punching shear is at a distance of d/2 from the face of the column.
What is punching shear in foundation?
Punching shear is a phenomenon where a concentrated force on a slab causes a shear failure cone that “punches” through. The applied shears and moments, along with the shape of the punching shear failure cone are used to calculate a maximum punching shear stress.
What are the methods of controlling punching shear in concrete slabs?
It can be used to develop an analytical model for the punching shear failure analysis of reinforced concrete plates. Furthermore, it has been discovered that punching shear can be prevented by increasing the depth of the concrete floor slabs, or by increasing the diameter of the columns supporting the floor.
What is punching reinforcement?
The weight of a slab supported on a column induces shear stresses in the slab. These stresses, if sufficient and where additional reinforcement is not provided, would result in the column ‘punching’ through the slab.
What is 2 way reinforced concrete slab?
What Is Two Way Slab? When a reinforced concrete slab is supported by beams on all the four sides and the loads are carried by the supports along with both directions, it is known as two way slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2.
What is one way & Two Way slab?
In one way slab, the load is carried in one direction perpendicular to the supporting beam. In two way slab, the load is carried in both directions. If L/b the ratio is greater than or equal 2 or then it is considered a one-way slab. If L/b the ratio is less than 2 then it is considered a two-way slab.
What is 1 way slab and 2 way slab?
Difference between One Way Slab and Two way slab:
| One Way Slab | Two Way Slab |
|---|---|
| Slabs are supported by the beams on the two opposite sides | Slabs are supported by beams on all the four sides. |
Should I check for two way shear or punch shear?
In the end, you have to check for both. When they tell you not to check for two way shear for wall foundations, it’s not because there is no two way shear. It is because one way shear controls all the time. The same applies for punching shear controlling slabs and isolated footings. But that is not always the case.
What is one way shear in construction?
You see, the force might either cause the side of the footing to completely shear off or the column to punch through the footing. In the first case, the failure happens along the footing from edge to edge and therefore called one way shear.
What happens when footing is weak in shear?
When footing is weak in shear at ‘d/2’ distance from column such that it cannot hold the overloaded column section, then it fails, and the column punches the footing and dips into ground, this phenomenon is termed as punching, also this can happen only when slab all around the column fails, hence name comes Two Way shear.
What is punching shear and how is it produced?
Punching shear is produced directly by the forces and moments acting on the column. For the simple case of a concentric footing with a downward load, the punching shear can easily be calculated as the volume of the bearing pressures on the critical area around the column.