Which structural member uses less material and is lighter than a comparable beam or joist for the same span?

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Multiple Choice

Which structural member uses less material and is lighter than a comparable beam or joist for the same span?

Explanation:
A triangulated truss system distributes loads primarily as axial forces in its members, forming triangles that keep the structure stable under load. This arrangement lets the overall span be achieved with much less material than a solid beam or a string of joists, which must resist bending along their length and thus require larger cross-sections. Girders are heavy primary supports and not optimized to span long distances with less material in the same way a truss is. Therefore, for the same span, the truss uses less material and is lighter.

A triangulated truss system distributes loads primarily as axial forces in its members, forming triangles that keep the structure stable under load. This arrangement lets the overall span be achieved with much less material than a solid beam or a string of joists, which must resist bending along their length and thus require larger cross-sections. Girders are heavy primary supports and not optimized to span long distances with less material in the same way a truss is. Therefore, for the same span, the truss uses less material and is lighter.

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