Advanced Cable Analysis group

The options in this group are used to specify the
advanced cable analysis feature and options specific to that analysis type.
Setting  Description 

Advanced Cable Analysis

Set this option to specify an advanced cable analysis. Refer to G.17.2.8 Advanced Nonlinear Cable Analysis
for details on the Advanced Cable analysis.
Note: Use of
the Advanced Cable analysis feature requires the
Advanced Analysis License. This
option is the default if you have the license.

Use Modified NewtonRaphson

Set this option to use the modified
NewtonRaphson method, which can reduce computation effort in compared to the
full NewtonRaphson method (at the expense of more iterations).

Use Geometric Matrix (Kg)

Set this option to specify the use of geometric
stiffness.


Cable Analysis Parameters group

Setting  Description 

Steps

Specify the number of load steps. The applied
loads will be applied gradually in this many steps. Each step will be iterated
to convergence. Should be in the range 5 to 145, with 145 as the recommended
number.

EqIterations

Maximum number of iterations permitted in each
load step. Should be in the range of 10 to 500, with 300 as the recommended
number.

Eqtolerance

The convergence tolerance for the above
iterations.

Sag Minimum

Cables (not trusses) may sag when tension is
low. This is accounted for by reducing the E value. Sag minimum may be between
1.0 (no sag E reduction) and 0.0 (full sag E reduction). As soon as
Sag Minimum becomes less than 0.95 the
possibility exists that a converged solution will not be achieved without
increasing the steps to 145 or the pretension loads. The
EqIterations may need to be 300 or
more. The
Eqtolerance may need to be greater or
smaller.

Stability Stiffness

Specify a stiffness matrix value that is added
to the global matrix at each translational direction for joints connected to
cables and nonlinear trusses for the first number of
Load Steps. The amount added linearly
decreases with each of the Load Steps. If a Stability Stiffness value is
specified, it should be within the range of 0.0 to 1000.0. This parameter
alters the stiffness of the structure.

Load Steps

The number of load steps over which the
Stability Stiffness is gradually
applied. Default is one step.

KSMALL

A stiffness matrix value that is added to the
global matrix at each translational direction for joints connected to cables
and nonlinear trusses for every load step. The range for KSMALL is between 0.0
and 1.0, with a default of 0.0. This parameter alters the stiffness of the
structure.


Print Option 
Standard STAAD.Pro analysis print options:
Setting  Description 

No Print

No analysis results will be printed to the output
file.

Load Data

Prints all the load data.

Statics Check

Provides a summation of the applied loads and support
reactions as well as a summation of moments of the loads and reactions taken
around the origin.

Statics Load

Prints everything that
Statics Check does, plus a summation of all
internal and external forces at each joint. This option potentially generates a
large volume of output.
Note: Since
PRINT STATIC LOAD generates voluminous output, the
printing of summation of internal and external forces at each joint is done for
structures which have less than 1,000 joints. If the structure has 1,000 joints
or more, this printing will be skipped.

Mode Shapes

Prints mode shape values at the joints for all
calculated mode shapes.

Both

This option is equivalent to the
Load Data plus
Statics Check options.

All

This option is equivalent to the
Load Data plus
Statics Check.

