Table of Contents
What is punching shear of foundation?
The punching shear is a failure mechanism in structural members like slabs and foundation by shear under the action of concentrated loads. The action of concentrated loads is on a smaller area in the structural members. In most cases, this reaction is the one from the column acting against the slab.
How do you stop a punching shear?
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.
Why punching shear is provided?
This angle of inclination is called shear. In punching and blanking operations the shear is provided respectively on punch face and die face respectively because of the cutting action will occur accordingly. Shear reduces the punch load, acts gradually and it is always less than equal to the thickness of sheet metal.
What is the difference between shearing and punching?
Unlike punching, which penetrates metal all the way through, shearing trims excess material from sheet metal. The process involves the use of tools, like a bench shear, to slice through metal with the utmost precision.
How is punching shear reinforcement calculated?
In all other cases
- Define the zone in which punching should be verified. Dimensions Lx’ & Lz’
- Define the contact surface. If the punching is caused by a column, you’ll see the section dimensions here.
- Define the plate thickness. By default you see the plate thickness from the geomety.
- See the main reinforcement.
What is punching shear failure in soil?
Punching Shear Failure – This type of failure occurs in loose sand or soft clay with relative density less than 35 %. In this type of failure, footing penetrates into the soil without any bulging in the soil at the surface.
How does punching shear failure occur?
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.
How do you stop a flat slab from hitting a shear?
To overcome the punching failure problem, there are many ways to increase the punching shear strength of concrete slabs, increasing slab thickness in the area adjacent to the column, increasing column thickness which is against the architectural desire, and finally providing slab with shear reinforcement.
What is shearing used for?
Most commonly, shearing is used to cut a sheet parallel to an existing edge which is held square, but angled cuts can be made as well. For this reason, shearing is primarily used to cut sheet stock into smaller sizes in preparation for other processes.
What do you understand by shearing?
1a : to cut off the hair from. b : to cut or clip (hair, wool, etc.) from someone or something also : to cut something from shear a lawn. c chiefly Scotland : to reap with a sickle. d : to cut or trim with shears or a similar instrument.
How does punching shear occur?
Punching shear arises when a concentrated load is applied to a small area of a slab or, most commonly, the reaction of a column against a slab. The resulting stresses are verified along defined control perimeters around the loaded area.