A STRUCTURE
can be defined as an assemblage of elements. STAAD is capable of analyzing and
designing structures consisting of both frame, plate/shell and solid elements.
Almost any type of structure can be analyzed by STAAD.
A SPACE structure, which is a three
dimensional framed structure with loads applied in any plane, is the most
general.
A PLANE
structure is bound by a global X-Y coordinate system with loads in the same
plane.
A TRUSS
structure consists of truss members which can have only axial member forces
and no bending in the members.
A FLOOR structure is a two or three
dimensional structure having no horizontal (global X or Z) movement of the
structure [FX, FZ & MY are restrained at every joint]. The floor framing
(in global X-Z plane) of a building is an ideal example of a FLOOR structure.
Columns can also be modeled with the floor in a FLOOR structure as long as the
structure has no horizontal loading. If there is any horizontal load, it must
be analyzed as a SPACE structure.
Specification of the correct structure type
reduces the number of equations to be solved during the analysis. This results
in a faster and more economic solution for the user. The degrees of freedom
associated with frame elements of different types of structures is illustrated
in Figure 1
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