Shear Forces

Structural Mechanics

1. SHEAR FORCES by SAJJABI COLIN POWELL ( 萨吉） L163330113

2. SHEAR FORCES Shear force is the force in the beam acting perpendicular to its longitudinal (x) axis. A force acting in a direction parallel to a surface or to a planar cross section of a body, as for example the pressure of air along the front of an airplane wing. A shear force is a force applied perpendicular to a surface, in opposition to an offset force acting in the opposite direction .

3. Shearing forces push one part of a body in one specific direction. In this case as we can see sliding along a line or plane.

4. SHEAR FAILURE Shear failure can be defined as a failure that takes place due to insufficiency of shear resistance available between the materials. Shear failure can be easily determined by checking out the excessive deflection or development of cracks, which gives an advance warning about the probable occurrence of shear failure.

5. REASONS BEHIND SHEAR FAILURE • It may occur due to insufficient knowledge of the resistance between reinforced steel rods and concrete column. • It may occur due to wrong interpretation of the data made available to the design engineer. • It may also take place due to insufficient strength of the concrete used for the structure. • It may even take place due to mismatch in the positioning of the reinforcement of steel rods.

6. When a structural member experiences failure by shear, two parts of it are pushed in different directions, for example would be when a piece of paper is cut by scissors. Shear failure of reinforced concrete, more properly called “diagonal tension failure” is one example If a beam without properly designed shear reinforcement is overloaded to failure, shear collapse is likely to occur suddenly with no advance warning (brittle failure).

7. To prevent some of the shear failures the engineers should properly design shear reinforcement to prevent it i.e Good strength of concrete Enough reinforncement in the concrete Proper organisation of reinforcements

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