Frames
A frame is a structure composed of rigid members connected by rigid or pinned joints. Unlike trusses, frame members can carry axial forces, shear forces, and bending moments. Frames are analyzed using the method of joints, method of sections, or by considering member end forces. Rigid frames transfer moments through joints.
Knowledge Check
1.What distinguishes a frame from a truss?
2.In a rigid frame, joints are:
3.A portal frame with a horizontal beam and two vertical columns is an example of a:
4.In a frame, the degree of indeterminacy depends on:
5.What is the primary load-carrying mechanism in a rigid frame under horizontal loads?
6.A pin-jointed frame with rigid members is called a:
7.For a fixed-pinned frame, the number of unknown reactions is:
8.Which method is commonly used to analyze rigid frames?
9.In a frame, the bending moment at a rigid joint must be:
10.A portal frame with pinned bases is: