Why does RCC slab vibrate?

The vibration is most often caused by rolling equipment crossing expansion joints cut in the concrete when poured. Cement contractors place these expansion joints in the floor to allow for the shrinkage that occurs in the concrete slabs as they cure.

How do you reduce vibration in a building?

For instance, machinery-induced vibrations can be minimised by using isolating mounts or motion-arresting pads. An inexpensive approach is to increase the floor loading within the building. Weight can be placed under a raised floor to minimise movement from foot traffic for instance, and dissipate vibration.

What is a vibrating beam?

A straight, horizontal cantilever beam under a vertical load will deform into a curve. When this force is removed, the beam will return to its original shape; however, its inertia will keep the beam in motion. Thus, the beam will vibrate at its characteristic frequencies.

How do you stop the vibration in cantilever beam?

Modal energy redistribution is utilized to suppress vibrations of a cantilever beam. The energy redistribution between the modes of the beam is achieved by switching on/off an end force which causes varying stiffness of the beam.

How do you find the natural frequency of a cantilever beam?

Beam is fixed from one end and the other end is free (cantilevered beam). The formula used for cantilever beam natural frequency calculations is: fn=Kn2π√EIgwl4 f n = K n 2 π E I g w l 4 . E in the formula is modulus of elasticity and I is the area moment of inertia.

How do you fix a floor vibration?

Fix bouncy floors by adding bridging, adding a layer of plywood or adding a wall or beam. We’ll show you three ways to stiffen up your bouncy floor—by adding bridging, installing plywood along the joists and adding a wall or beam under the floor. Any one of the three can solve your problem, depending on your situation.

Why does the floor feel like it’s vibrating?

Causes of floor vibrations Floor vibrations are generally related to human activity, vibrating machinery and external forces. Walking is the most common source of floor vibrations and more than anything is simply considered a nuisance.