A 'pin-jointed truss' carries load only in:
Choose the correct answer
Bending and shear only
Axial forces only (tension or compression) — pin joints transmit no moment; loads must be at joints
Only shear forces
Torsion along member axis
Correct Answer
B. Axial forces only (tension or compression) — pin joints transmit no moment; loads must be at joints
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Pin-jointed (ideal) truss: all members connected by frictionless pins at joints; loads applied ONLY at joints. Result: all members carry AXIAL forces only (tension or compression) — no bending or shear. Real trusses use gusset plates (not true pins) but are designed as pin-jointed if loads are at joints. Zero-force members: identified by inspection (two-member joint with no load = both zero).
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