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structures having more unknown forces than the available equilibrium equations

r = 3n

r > 3n

r > 3n. what is r?

r > 3n. what is n?

A structure or a member is ____ if it satisfy the equations of equilibrium, and the members are properly held or constrained by the support

A case when a structure or one of its members may have fewer reactive forces than the equations of equilibrium

A case where there may be as many unknown forces as there are equations, however, instability or movement of a structure or its members can develop due to improper constraining by the supports

A structure composed of slender members joined together at their endpoints

A structure composed of ___ ____ joined together at their endpoints

The members commonly used in construction consist of wooden struts, metal bars, angles or channels.

A structural frame usually fabricated from pieces of metal or timber to form a series of triangles lying in a single plane

The truss linear members are subject only to ___ or ___

The horizontal/sloping pieces forming the top and bottom of the truss are called the ___, and the sloping and vertical pieces connecting the chords are collectively called the web

The horizontal/sloping pieces forming the top and bottom of the truss are called the chords, and the sloping and vertical pieces connecting the chords are collectively called the ___

constructed by starting with a basic triangular element and connecting two members to form an additional joint.

formed by connecting two or more simple trusses together. Used to support loads acting over a large span since it is cheaper to construct lighter compound truss than to use a heavier single truss

one that cannot be classified as being either simple or compound

A truss is ___ ____ if all of its reactions are concurrent or parallel

The ___ ___ of a truss can often be checked by careful inspection of the arrangement of its members

A truss that does not hold its joints in a fixed position is ___ or has a ___ ___

To determine the internal stability of a compound truss, it is necessary to ___ the way in which the simple trusses are connected together

ZERO FORCE MEMBERS Connected at the right angle. No external load on the joint

ZERO FORCE MEMBERS No external load or reaction acts on the joint. Perpendicular to the two collinear members

This is the force / moment /reaction at a certain point of a structural member due to the exerted external load on it.

There are 3 internal loadings at a point