# 10.01.03.056

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Published on March 15, 2014

Source: slideshare.net

Ahsanullah University Of Science and Technology Department Of Civil Engineering CE-418 Prestressed Concrete and Design Sessional

Presented By Name : Md. Kamrul islam Roll : 10.01.03.056 Section : A

Topic Bearing&Punching Shear

What is Punching Shear? Punching Shear  Punching shear is a type of failure of reinforced concrete slabs subjected to high localized forces. In flat slab structures this occurs at column support points. The failure is due to shear  The shear stress calculated by dividing the load on a column by the product of its perimeter and the thickness of the base or cap, or by the product of the perimeter taken at one-half the slab thickness away from the column and the thickness of the base or cap.

Punching shear in concrete slabs is a problem Punching shear in concrete slabs is a serious problem in certain structural systems, such as flat slabs

Punching Shear

Punching Shear

Punching Shear

Bearing stress • Bearing stress is a compressive stress applied to the contact surface between two connecting members. This stress can commonly be found on a pin & hole connection. • Like general stress, bearing stress is not evenly uniform over the cross-sectional area but is generally assumed for simplicity. • The average bearing stress is the force pushing against a structure divided by the area. Exact bearing stress is more complicated. Experiments have shown that the bearing stress distribution is more elliptical shaped and not uniform.

Bearing Stress Equation σavg=P/A σ avg – Stress (Average) P – Applied Load A – Cross-Sectional Area (Preload) Bearing Stress Bearing stress is a normal stress, not a shearing stress.

Bearing Stress

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