Redundant truss important part the gate syllabus

Redundant Truss

In a redundant truss structure, more members are available than required for a perfect truss. In the GATE question paper, a redundant truss structure can be used for MSQ-based questions. An analysis of the redundant types of trusses can not be done with the help of only equilibrium equations; it requires some compatibility conditions. There are determinate and indeterminate structures. So such a type of truss is an indeterminate structure. The degree of redundancy of such a truss depends on the number of redundant members, which can be calculated by the formula m= 2j - 3.

Different Forms of a Truss

Deficient Truss: In such a truss structure, a truss's members are less than required to transfer the loads. It can be expressed as m < 2j - 3.

Redundant Truss: In such a truss structure, a truss's members are more than required to transfer the loads. It can be expressed as m > 2j - 3.