Explain why the midsection of a arch
is subjected to less BM in comparison
of a simply supported beam of the same
span.
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An arch just carries loads through compressive stresses in its plane. That means that, if properly designed, no bending moment in its plane must be supported, which basically means that roughly every square inch of the material is resisting a kind of similar amount of load. Now go and compare that to a beam: if it has a constant cross-section, that's a lot of material being wasted there, because you have the same amount of material resisting parts where the bending moment is 0 as well as the parts where the bending moment is at its peak.. if it's a variable cross-section, well, it's pretty expensive to make.
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