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Software Verification Examples for SCADA Pro
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B3. Analysis & Design of Steel Structures
B3.1. Three Dimensional Steel Truss Roof
Problem Description
A three dimensional steel truss roof subjected to vertical loading is examined (Figure
B3.1.1).
Geometry, Properties and Loads
The cross section of top and bottom flange of main typical trusses is SHS150x10, of
diagonals is SHS90x5. The cross section of top and bottom flange of secondary trusses is
CHS60.3x4, of diagonals is CHS48.3x4.
The cross section of rafters is IPE-160 and of stiff joints is LEQ100x10. Modulus of
elasticity of the material is 210GPa and Poisson ratio is 0.30. The class of structural steel is
S235.
The main trusses are simply supported. The vertical movement of the edge of the rafters is
forbidden.
Self-weight is taken into account (ε
s
=78.5kN/m
3
). Rafters are subjected to permanent
distributed vertical load of 1.430kN/m and 0.715kN/m for middle and outside rafters,
respectively (Figure B3.1.2.a). Rafters are also subjected to variable distributed vertical load
of 1.773kN/m and 0.887kN/m for middle and outside rafters, respectively (Figure B3.1.2.b).
Two cases of loading combinations are examined. In the first one (Comb1) the value of the
participation factor of all loads is equal to 1.0. In the second case (Comb2) the participation
factor of permanent loads is equal to 1.35 while the corresponding one of the variable load
is equal to 1.50.