Load No.

Specify an integer value to define a new load case
combination. This number is automatically incremented.

Name

Specify a Name for the load case
combination.

Type

There are three types of combinations possible:

Normal  A pure algebraic load
combination in which the results of all constituent cases will be algebraically
added. To accomplish this, select each case individually from the left pane,
specify the value by wish we see its results factored, and move it over to the
right pane by clicking on the > arrow. Do not check any of the boxes
Combine Algebraically, SRSS or ABS.

SRSS  The square root of the sum of
the squares method of combination.
This enables one to achieve a combination such
as L1 * f1 + r1 * [√(f2*L2^{2} + f3*L3^{2})]. The sequence of
operations will be,
 Select the
SRSS check box. The Combine
Algebraically check box will become active.
 Select
L1. In the box above Combine Algebraically, specify a Factor,
(term f1 in the equation above), place a check against the Combine
Algebraically check box, click on the > arrow.
 Select
L2. In the box above Combine Algebraically, specify a Factor,
(term f2 in the equation above), uncheck the Combine Algebraically
check box, click on the > arrow.
 Select
L3. In the box above Combine Algebraically, specify a Factor,
(term f3 in the equation above), keep the Combine Algebraically box
unchecked, click on the > arrow.
 In the box
called Factor which appears to the right of the expression SRSS,
specify the value for r1.

ABS  Algebraic combination of
absolute values.
This enables one to achieve a combination such
as f1*ABS(L1) + f2*ABS(L2). The sequence of operations will be,
 Switch on the
ABS check box.
 Select
L1. In the box above Combine Algebraically, specify a Factor,
(term f1 in the equation above), click on the > arrow.
 Select
L2. In the box above Combine Algebraically, specify a Factor,
(term f2 in the equation above), click on the > arrow.

Factor

The load factor coefficient, b, used for the square
root value of the sum of the squares.

Default

Indicates the default value of the load factor, a
(or c, in the case of a SRSS combination), for any load case moved from the
Available Load Cases to the Load Combination Definition.
Load factors may be changed from the current default
by selecting the entry in the Load Combination Definition.

SRSS Component

(Active only when the
SRSS type is selected) The SRSS load
combination type allows a mixture of algebraic combination with an SRSS
combination. Select this option to for the load to include it as a SRSS in lieu
algebraic addition.

Generate Combination

(Active only when either the
SRSS or
ABS type is selected) Se this option to
generate 1  64 load combinations for each combination of degrees of freedom at
member ends to create load envelopes for positive and negative analysis results
for SRSS and Absolute load combinations.

Available Load Cases list

Lists all of the previously created Primary Load
Cases or Load Combinations in the current input file.
Tip: Double clicking any load case or
combination will add it to the Load Combination Definition list.

Load Combination Definition list

Entries here represent the Primary Load Case, load
factors, and SRSS component (if any) which will make up the Load Combination.

List Operators

Click this button…

to…

>

Add the selected load
case or combination to the Load Combination Definition list

>>

Add all load cases and
combinations to the Load Combination Definition list.

<<

Remove all entries in the
Load Combination Definition list.

<

Remove the selected entry
from the Load Combination Definition list.

