explain the following concrete beams used inlarge buildinghave greater depth than breath
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Answer:
Why depth of beam is greater than its width?
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The major function of beam is to resist moment generated by applied load or to resist the deflection which generates again high Moment on beam. So this applied Moment is resisted through the special property of beam “EI” which includes type of material (Modulus of Elasticity) and dimensions of beam (width & depth).
Now in general all beams are designed as rectangular type due to simple, rapid construction and provides good support to the slab.
Major load in a structure is mostly the Dead Load ( self load ) which covers minimum roughly 60% of the total load and it is always in downward direction. So to resist the Moment (induced by the loading), EI property comes into picture and as material is fixed so Modules of Elasticity(E) does not change. So to resist large moment caused by downward load , Moment of Inertia (I) value has to be increased which is dimensional property of beam.
Moment of inertia is the second moment of Area which means that to increase the MoI Either the Area to be increased or the distance from the Neutral Axis to the center of the Area is to increased. As distance from the Neutral Axis to the center of the Area is squarly proportional to the MoI, it will be easy and economical to increase the distance. ( MoI = A*r^2)
So to resist the Moment caused by transverse loading, depth of beam (parallel to the loading plane) is to be increased.
Increasing width can also provide large MoI but that will not be economical to do.
That's why beams have depth more than width.
Explanation: