What is the rigidity of the beam?
In structural engineering, the rigidity of the beam is the ability of the beam to resist deflecting or bending when the bending moment is applied. The bending torque results in a force applied somewhere in the middle of the beam fastened to one or both ends. This will also happen if torque is applied to the beam, although it is less common in real applications. The rigidity of the beam is influenced by the beam material and the shape of the beam cross -section.
The motivation for the design of the beam that resists deflection is easy to appreciate in the bridge. For example, concrete is great for its pressure force, but the bridge made exclusively from concrete would be a bad choice. Concrete is not strong when bent; The bridge made of concrete is sagging due to gravity and likely to disintegrate. The bridge could be much stronger if it had some kind of foundations or skeleton to be too diverted in the middle.
The rigidity of the beam can be calculated using two factors. The first factor is elastic module . PoisonThe material property of the material tendency to deform or stretch when the tension is tension. If the beam is made of stainless steel, it will have a higher elastic module than, say, aluminum. This is because if the same forces are applied to the same shape of steel and aluminum, the steel object would be less distorted. Although metals do not differ much compared to rubber bands, they behave in the same way; They decompose in proportion to how hard power pulls on them. So a beam made of a material with a high elastic module will have a high rigidity of the beam, so it is less likely to bend.
The second factor of beam stiffness is the moment of the inertia of the beam cross -section. This has to do with the vertical distribution of material near or from the beam centers. The frequently used beam design in building engineering with high inertia is the beam I. It is called an i-parsky because of its cross-section, which is shaped as the letter "I". This shape focuses a large part of the material towards the bottom and the upper part of the cross -section with a sufficient amount of material in the middle areas for connecting the outer parts. The reason for this shape is that it maximizes the moment of inertia for a given amount of material. The most common material used in I-Pans is steel that provides a high elastic module. These two properties of the pale give him a very high rigidity of the beam.