Truss
defined as structure composed of rigid members connected together in a way
enable it to resist change in shape due to the loads.
The
main purpose of truss is to carry larger loads or spans than any individual
member (truss members) can.
In
order to determine the internal forces in each member of the truss (individual
members), the following assumptions are made:
1. The
members are connected together by frictionless joints (pins).
2.
External forces are subjected at the joints only.
In
fact, these assumptions are achieved in imaginary truss called “ideal truss”.
Because, For example, there are no joints in nature are
frictionless, also, external forces may be applied along the axes of the
members (not at joints) like weights of the members and the wind load. Such
forces are either neglected (e.g., if the weights of the members are small in comparison
with the loads) or their resultants are replaced by statically equivalent
forces at the adjacent pins.
In this lecture we will discuss plane trusses.
See the attached file, please