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Section 1
1-37
The diagram below shows directions and sign convention of
local axes and forces.
Figure 1.30
1.7 Member Properties
The following types of member property specifications are
available in STAAD:
A) PRISMATIC property specifications
B) Standard Steel shapes from built-in section library
See section
5.20
C) User created steel tables
D) TAPERED sections
E) Through ASSIGN command
F) CURVED specification
Shear Area for members refers to the shear stiffness effective area.
Shear stiffness effective area is used to calculate shear stiffness
for the member stiffness matrix. As an example: for a rectangular
cross section, the shear stiffness effective area is usually taken as
0.83 (Roark) to 0.85 (Cowper) times the cross sectional area. A
shear area of less than the cross sectional area will reduce the
stiffness. A typical shearing stiffness term is