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General Description
Section 1
1-40
STAAD automatically considers the additional deflection of
members due to pure shear (in addition to deflection due to
ordinary bending theory). To ignore the shear deflection, enter a
SET SHEAR command before the joint coordinates. This will
bring results close to textbook results.
The depths in the two major directions (YD and ZD) are used in
the program to calculate the section moduli. These are needed only
to calculate member stresses or to perform concrete design. The
user can omit the YD & ZD values if stresses or design of these
members are of no interest.
The default value is 253.75 mm (9.99
inches) for YD and ZD. All the prismatic properties are input in
the local member coordinates.
ZB
YB
ZD
YD
ZD
YD
ZB
Figure 1.31
To define a concrete member, the user must not provide AX, but
instead, provide YD and ZD for a rectangular section and just YD
for a circular section. If no moment of inertia or shear areas are
provided, the program will automatically calculate these from YD
and ZD.
Table 1.1 is offered to assist the user in specifying the necessary
section values. It lists, by structural type, the required section
properties for any analysis. For the PLANE or FLOOR type
analyses, the choice of the required moment of inertia depends
upon the beta angle. If BETA equals zero, the required property is
IZ.