To generate load combinations for the Strength limit
state per
Eurocode - Basis of structural design, BS EN
1990:2002+A1:2005 (sometimes referred to as
Eurocode 0).
The load combination
generator is capable of creating load combinations per equations 6.10, 6.10a,
or 6.10b found in Cl. 6.4.3.2.
The load
combination generator is capable of creating load combinations per equations
6.10, 6.10a, or 6.10b found in Cl. 6.4.3.2.
These equations specify the following combinations of
loads:
(6.10)
Alternatively, for the strength limit state, the less
favorable of equations 6.10a and 6.10b may be used:
((6.10a))
((6.10b))
where
Gk
=
Permanent actions
P
=
Prestress actions
Qk
=
Variable actions
Note: The effects in each
of the above equations are always additive. If any effect is negative (that is,
would reduce the final sum), its effect is taken as zero.
On the
Utilities ribbon tab, select the
User Tools > Euro Code
Load Combination Generator tool in the
User Tools group.
The
Eurocode Combination Generator
dialog opens.
Select the
Equation Number to use for the generation of
load combinations.
Optional: Specify a
Start Combination Number.
Select the
Method as either:
Combination
to use post-analysis combination of results, which appropriate for linear
elastic analysis
Repeat Load
to generate repeat load cases from the primary load cases, which is appropriate
for second order effects and dynamic analysis
Optional: Specify load Factors for use in the combination equations.
Factor title
Equation notation
Permanent Actions, Gamma G
γG
Pre Stress Actions, Gamma
P
γP
Variable Actions, Gamma Q
γQ
Permanent Action Reduction
Factor, Xi
ξ
Variable Action Combination
Factor, Psi 0
ψ0
Note: The default
values are taken from those provided in EC0.
Optional: Click Table A1.1 to select one of the
recommended values for the Permanent Action Reduction Factor, Psi
(ψ0).
Click
Categories to specify in which load action
classification each
STAAD.Pro load category is to be
assigned.
Action
Included Loads
(None)
Loads of this type will
not be included in generated load combinations.
Permanent
Gk (permanent) By default, Dead loads are
included.
Tip: You may also want to include
Mass or Gravity load.
Variable
Q (variable) By default, Live, Roof Live,
Wind, and Snow are included.
Tip: You may also want to include
loads such as Seismic, Temperature, etc.
Pre Stress
P (prestress) No loads are included by
default in this category.
Tip: As
STAAD.Pro does not use a
load category for prestressing forces, a less-common load category such as
Imperfection can be used for this
action.
Click
Generate Combinations.
A confirmation dialog box opens with the
status of the export. Load cases are generated with the selection equation and
load case number in the title.
