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XTRACT User Manual

Version 12

© Copyright 2009. Century Dynamics Limited. All Rights Reserved. Century Dynamics is a subsidiary of ANSYS, Inc.

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Published in the U.S.A.

Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

XTRACT User Manual Update Sheet for Version 12

April 2009

Modifications:

The following modifications have been incorporated:

Section Page(s) Update/Addition Explanation

All All Update Conversion to Microsoft® Word format

Contents XTRACT User Manual

i Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

TABLE OF CONTENTS

1. Printing of Selected Displacements/Reactions and Stresses .............................. 1-1

1.1. Introduction ............................................................................................ 1-1 1.2. Program Description .............................................................................. 1-1

2. Data Formats ...................................................................................................... 2-1 2.1. General Principles .................................................................................. 2-1

2.1.1. Special Symbols ................................................................................. 2-1 2.2. ELEM Command ................................................................................... 2-2 2.3. STRESS Command ................................................................................ 2-2 2.4. NODE Command ................................................................................... 2-2 2.5. CASE Command .................................................................................... 2-3 2.6. NSIGF Command .................................................................................. 2-3 2.7. SECT Command .................................................................................... 2-4 2.8. JOIN Command ..................................................................................... 2-4 2.9. STOP Command .................................................................................... 2-4 2.10. The LOCL Option for the Transformation of ’Pile’ Displacements...... 2-5

3. Examples ............................................................................................................ 3-1 3.1. Example 1: Printing Stresses from an ASAS Analysis ......................... 3-1 3.2. Example 2: Component Analysis, Printing Stresses and Displacements in the Local Axis System ........................................................................................... 3-1 3.3. Example 3: Component ASAS Analysis Printing Displacements ........ 3-1

Appendix A. - Preliminary Data for XTRACT ......................................................... A-1 A.1 Introduction ............................................................................................ A-1 A.2 SYSTEM Command .............................................................................. A-1 A.3 PROJECT Command ............................................................................. A-2 A.4 JOB Command ....................................................................................... A-3 A.5 TITLE Command ................................................................................... A-3 A.6 TEXT Command .................................................................................... A-3 A.7 STRUCTURE Command....................................................................... A-4 A.8 COMPONENT Command ..................................................................... A-4 A.9 OPTIONS Command ............................................................................. A-5 A.10 END Command ...................................................................................... A-6

Appendix B. - Running XTRACT ............................................................................ B-1 B.1 Files Required by XTRACT .................................................................. B-1 B.2 Running Instructions for XTRACT ....................................................... B-1

Appendix C. - Options .............................................................................................. C-1 C.1 Miscellaneous Options ........................................................................... C-1 C.2 XTRACT Options .................................................................................. C-1

Appendix D. - Stress Numbers ................................................................................. D-1

Introduction XTRACT User Manual

Page 1-1 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

XTRACT Extract Displacements and Stresses from an ASAS Database

1. Printing of Selected Displacements/Reactions and Stresses

1.1. Introduction

The XTRACT program is a post-processor for the ASAS suite, which enables the analyst to select for printing specific results either displacements or stresses, for specific nodes and elements, or a load balance for specific sections. The analyst may also select the loadcases for which the results are to be printed.

This selective printing allows results for the critical points in an analysis to be printed out for inclusion in reports, or for examination where the printing was turned off in the previous run.

Additional options exist for specialist manipulation, e.g. the printing of displacements for beam elements in the local axis system of an element, printing reactions instead of displacements, printing reactions as point loads.

The program may also be used to print out displacements, reactions and stresses to a high degree of accuracy, i.e. up to 13 significant figures.

1.2. Program Description

The XTRACT program operates on files saved from an ASAS, LOCO or RESPONSE analysis. These files are saved by adding a SAVE LOCO FILES line to the preliminary data block. The files contain the displacements and stresses, together with structural description.

The program is divided into three parts. The first reads the data, and stores it on a temporary file. The second part checks the input data against information read back from the ASAS backing files. Error messages will be generated if the user has attempted to process non-existent nodes, elements, or loadcases. If there are errors the program will terminate at this stage. If no errors are detected XTRACT will read the required information from the ASAS backing files, and then continue to the final section where the information is printed.

Introduction XTRACT User Manual


Data Formats XTRACT User Manual


2. Data Formats

The XTRACT data is divided into two sections, the Preliminary Data and the main XTRACT Data.

Full details of the Preliminary Data are given in Appendix A of this manual. Details of the main XTRACT data are given in the following sections.

2.1. General Principles

The input data for XTRACT are specified according to syntax diagrams similar to the one shown below. The conventions adopted are described in the following paragraphs.

Each horizontal branch represents a possible input instruction. Input instructions consist of a keyword (shown in upper case) followed by data (shown in lower case). XTRACT data are in the form of integer lists which is indicated by the horizontal arrow around the data item.

Each item in the list is separated from each other by a comma or one or more blank spaces. To reduce the amount of data required, a range of integers may be specified using the form i TO n, eg.

ELEM 1 4 6 TO 12 16 19 TO 22

and ELEM 1 4 6 7 8 9 10 11 12 16 19 20 21 22 are equivalent

An input line must not be longer than 80 characters. Keywords may be specified in either upper or lower case letters.

2.1.1. Special Symbols

The following is a list of characters which have a special significance to the XTRACT data

* An asterisk is used to define the beginning of a comment. Whatever follows on the line will not be

interpreted

* THIS IS A COMMENT LINE

, A comma or blank will act as a delimiter between data items on a line

5,10,15 is the same as 5 10 15

KEYWORD integer



2.2. ELEM Command

The ELEM command defines those elements for which stresses are to be printed. If the LOCL option is used, the displacements for these elements in the element local axis system will also be printed.

Parameters

ELEM : keyword

elno : list of user element numbers (Integers)

2.3. STRESS Command

The STRESS command defines which stresses are to be printed for the selected elements.

Parameters

STRESS : keyword

snum : list of stress numbers required (Integers). See Appendix D for the correspondence between stress numbers and stress types.

Notes

Up to a maximum of 15 stress numbers may be entered.

2.4. NODE Command

The NODE command defines those nodes for which displacements are required. If the REAC option has been used, reactions not displacements for the nodes will be printed.

Parameters

elnoELEM

snumSTRESS

nodeNODE



NODE : keyword

node : list of node numbers (Integers)

2.5. CASE Command

The CASE command defines the user loadcases for which results are to be printed.

Parameters

CASE : keyword

loadcase : list of loadcase numbers (Integers)

Note

If the CASE command is omitted, all loadcases will be printed.

2.6. NSIGF Command

The NSIGF command defines the number of significant figures to which the output will be printed, for NODE or ELEM data.

Parameters

NSIGF : keyword

nsig : number of significant figures required (Integer)

Notes

1. The default value is 4. The maximum value is 13.

2. If the LOCL option is in use the NSIFG command changes the way in which the output is presented. If a value of less than 4 is used, the results are printed in a tabular format in continuous columns across the page. If a value greater or equal to 4 is used, the results are printed in report style, one element/case per page.

loadcaseCASE

nsig NSIGF



2.7. SECT Command

The SECT command indicates the start of a new section defined by the following JOIN command.

Parameters

SECT : keyword

sect : section ID number (Integer)

Note

SECT data cannot be given in the same run as NODE and/or ELEM data.

2.8. JOIN Command

The JOIN command defines the nodes to be included in a section for load balance calculations and the elements to be considered at those nodes. If the LOCL option has been used, forces in local directions for each chosen element at a joint will also be printed.

Parameters

JOIN : keyword

node : node number (Integer)

elno : list of user element numbers to be included at node (Integers)

Note

The element number list may be replaced by the keyword ALL

2.9. STOP Command

Specifies the end of the data. Compulsory.

sect SECT

elnoJOIN node



Parameters

STOP : keyword

2.10. The LOCL Option for the Transformation of ’Pile’ Displacements

When option LOCL is used with the ELEM command, XTRACT takes the displacements of selected beam elements and transforms them into the local axis system of the element. The system used is defined as having the local x axis from the node with the smallest z coordinate to the upper node. The y and z axes are defined by the element type in the normal way. If one of the nodes has already been skewed then this will be taken into account in calculating the new skew system. It is therefore possible for the nodes at each end of an element to have different skew systems. All the skew systems are printed at the end of the data check. These skew systems are used to transform the nodal displacements for each selected loadcase, which are then stored on a temporary backing file prior to being printed. The selected stresses are extracted and stored in a similar manner.

There are two forms of output, the one selected depends on the number of significant figures to which the output is required. If a low degree of accuracy is acceptable, the results are output in tabular form with displacements and stresss output as one line per loadcase. If a higher degree of accuracy is desired a report form of output is generated, which has column headings for each loadcase.

STOP

Examples XTRACT User Manual


3. Examples

3.1. Example 1: Printing Stresses from an ASAS Analysis

SYSTEM DATA AREA 30000

PROJECT PRJ7

JOB POST

TITLE DECK LEG STRESSES ALL LOADCASES

TEXT UNITS KN AND MM

TEXT ACO PLATFORM RE-ANALYSIS

TEXT JOB NO 738-420

STRUCTURE JAC7

OPTIONS END

END

ELEM 1036 102 1086 1022

CASE ALL

STOP

3.2. Example 2: Component Analysis, Printing Stresses and Displacements in the Local Axis System


PROJECT PRJ1

JOB POST

TITLE PILE DISPLACEMENTS IN LOCAL AXIS SYSTEM

STRUCTURE JAC3

COMPONENT JAC3 PILE

OPTIONS LOCL END

END

ELEM 22 24 32 34

CASE 1 2 46 9 11

STOP

3.3. Example 3: Component ASAS Analysis Printing Displacements


PROJECT FRA1

JOB POST FRA1 FRA1

TITLE CONFIGURATION C7 MAX FLAP DISPLACEMENTS

STRUCTURE STR7

COMPONENT STR7 WING FLAP

OPTIONS END

END

NODE 11 TO 20



NODE 271 272 273

NODE 103 TO 108

NODE 1037 1039

NSIG 8

CASE 1 3 7 9

STOP

Appendix A XTRACT User Manual

Page A-1 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

Appendix A. - Preliminary Data for XTRACT

A.1 Introduction

The preliminary data is the first block of the XTRACT information. It defines the memory size to be used, the project name, structure and component names, file names and options to be used.

The preliminary data must commence with the SYSTEM command and terminate with END. Within these bounds the other commands may be given in any order. It is suggested, however, that the order given above is adopted.

Note

The UNITS command is not active in XTRACT. Therefore all printed output is in the same units as the analysis units of the original run.

A.2 SYSTEM Command

To define the amount of memory used for data by this run. (Optional)

SYSTEM

TEXT

STRUCTURE

DATA AREA memory

POSTJOB

titleTITLE

text

sname

COMPONENT sname tree

OPTIONS option

pnamePROJECT

END



Parameters

SYSTEM : keyword

DATA AREA : keyword

memory : amount of memory (in integer words) to be used by this run. Typical values are between 30000 and 1000000. If the SYSTEM command is omitted, a default value of 1000000 is used (Integer)

Examples


A.3 PROJECT Command

To define the project name for the current run. Optional.

Parameters

PROJECT : keyword

pname : project name for current run. (Alphanumeric, 4 characters, first character must be alphabetic)

Note

All runs with the same project name access the same data base. A project data base consists of one project file (with a file name consisting of the 4 characters of pname with the number 10 appended) which acts as an index to other files created under this project, together with those other files.

Example

PROJECT HIJK

SYSTEM DATA AREA memory

pname PROJECT



A.4 JOB Command

To define the type of analysis being performed. Compulsory.

Parameters

JOB : keyword.

POST : keyword.

Example

JOB POST

A.5 TITLE Command

To define a title for this run. Recommended.

Parameters

TITLE : keyword

title : this line of text will be printed out at the top of each page of ASAS output. (Alphanumeric, up to 74 characters)

Example

TITLE THIS IS AN EXAMPLE OF A TITLE LINE

A.6 TEXT Command

To define a line of text to be printed once only at the beginning of the output. Several TEXT lines may be defined to give a fuller description of the current analysis on the printed output.

POST JOB

title TITLE



Parameters

TEXT : keyword

text : this line of text will be printed once, at the beginning of the output. (Alphanumeric, up to 75 characters)

Example

TEXT THIS EXAMPLE OF THE TEXT

TEXT COMMAND IS SPREAD

TEXT OVER THREE LINES

A.7 STRUCTURE Command

To define the name of an existing structure within the current project that is to be processed in this run.

Parameters

STRUCTURE : keyword

sname : structure name identifying which existing structure is to be accessed from the project defined on the PROJECT command. (Alphanumeric, 4 characters, the first character must be alphabetic)

See also A.8 COMPONENT command.

Example

STRUCTURE SHIP

A.8 COMPONENT Command

To define the component tree for a substructure combination run. Not valid for a non-substructured analysis.

TEXT text

STRUCTURE sname



Parameters

COMPONENT : keyword

sname : structure name as defined on the previous STRUCTURE command. (Alphanumeric, 4

characters, the first character must be alphabetic).

tree : this is the path down the component tree from the given structure in sname to the

component which is being used for the XTRACT stress and displacement printing.

Note

1. If the user is processing the global structure run in a substructure analysis, use only the STRUCTURE command (A.7).

Example

COMPONENT SHIP PORT BULK

A.9 OPTIONS Command

To define the control options for this run. Optional.

Parameters

OPTIONS : keyword

option : 4 character option name, or list of option names. See Appendix C for details of each option available.

Example

OPTIONS DATA GOON NODL END

COMPONENT sname tree

OPTIONS option



A.10 END Command

To terminate the preliminary data. Compulsory.

Parameters

END : compulsory keyword

END

Appendix B XTRACT User Manual

Page B-1 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

Appendix B. - Running XTRACT

B.1 Files Required by XTRACT

XTRACT operates on the files produced by the preceding ASAS, RESPONSE or LOCO runs and hence these must physically be present in the user’s disc space for the program to run successfully. In all cases the project file must exist which contains information about all other files required for the current analysis. The name of this file is derived from the four character Project Name defined on the PROJECT command. (For example, if the Project Name is PRKZ, then the Project File will be PRKZ1O).

For each ASAS, RESPONSE or LOCO with a ‘SAVE LOCO FILES’ line in its preliminary data, there will be a physical file containing the stress and displacement information from that analysis. Again the physical file names are derived from the four character name defined on the FILES command. Typically, if the name was STVK, then the physical file would be STVK35. The information stored in the file will depend on the form of the run producing the output. The stresses and displacements may relate to a single step analysis of a structure or to the results associated with elements at any level in a substructured analysis. Provided that the user has the requisite files on disc the program will handle them in a transparent manner.

B.2 Running Instructions for XTRACT

See the appendices in the ASAS User Manual, Volume 1, for details on how to run any of the programs in the ASAS suite.

Appendix C XTRACT User Manual

Page C-1 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

Appendix C. - Options

C.1 Miscellaneous Options

Option Name Application

DATA Performs data checking only

NOBL Do not print the XTRACT title page

C.2 XTRACT Options

Option Name Application

LOCL Print displacements or forces in the local axis system

REAC Print reactions instead of displacements

PTLD Print reactions in the form of a point loads data block

PRDP Print displacements in the form of a prescribed displacements data block

FIXD For options PTLD and PRDP, output in old fixed format style

SGLO Convert displacements or reactions for S freedoms on elements to global X,Y,Z directions

Appendix D XTRACT User Manual

Page D-1 Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

Appendix D. - Stress Numbers

This Appendix contains tables of stress numbers and their corresponding stress types for each element type in ASAS. The stress number is used when selecting stresses for print out. See Section 2.3.

Appendix D

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Stress Number

Element 1 2 3 4 5 6 7 8 9 10

AHH2 MEM SS MEM HH SHEAR SH MOM MS MOM MH TWIST T SHEAR QS SHEAR QT ASH2 MEM SS MEM HH MOM MS MOM MTH SHEAR Q BAX3 See Below BEAM FOR XX SH QY SH QZ TOR XX MOM YY MOM ZZ BMGN FOR XX SH QY SH QZ STR XY MOM YY MOM ZZ BM2D FOR XX SH QY MOM ZZ STR XY BM3D FOR XX SH QY SH QZ STR XY MOM YY MOM ZZ BRK6 STR XX STR YY STR ZZ STR XY STR YZ STR XZ BRK8 STR XX STR YY STR ZZ STR XY STR YZ STR XZ BR15 STR XX STR YY STR ZZ STR XY STR YZ STR XZ

BR20 STR XX STR YY STR ZZ STR XY STR YZ STR XZ BR32 STR XX STR YY STR ZZ STR XY STR YZ STR XZ CB15 N/A CK11 K1 K2 CTM6 N/A CTX6 N/A CURB SH QX SH QY SH QZ MOM XX MOM YY MOM ZZ FAX3 FOR XX FLOW STR XX FOR QX FOR QY FOR QZ FLA2 STR XX FLA3 STR XX

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Stress Number

Element 1 2 3 4 5 6 7 8 9 10

GCB3 FOR XX MOM YY MOM ZZ TOR XX GCS6 STR XX STR YY STR XY MOM XX MOM YY MOM XY GCS8 STR XX STR YY STR XY MOM XX MOM YY MOM XY GRIL SH QZ TOR XX MOM YY MEM4 STR XX STR YY STR XY MOQ4 STR XX STR YY STR XY STR A1 STR A2 QHX4 STR RR STR ZZ STR HH STR RZ STR ZH STR RH QHX8 STR RR STR ZZ STR HH STR RZ STR ZH STR RH QUM4 STR XX STR YY STR XY QUM8 STR XX STR YY STR XY

QUS4 STR XX STR YY STR XY

QUX4 STR RR STR ZZ STR HH QUX8 STR RR STR ZZ STR HH SCK7 K1 SLB8 MOM XX MOM YY MOM XY SH QX SH QY SND6 STR XX STR YY STR ZZ STR XY STR YZ STR XZ SND8 STR XX STR YY STR ZZ STR XY STR YZ STR XZ SN12 STR XX STR YY STR ZZ STR XY STR YZ STR XZ SN16 STR XX STR YY STR ZZ STR XY STR YZ STR XZ SPR1 FOR XX FOR YY FOR ZZ

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Stress Number

Element 1 2 3 4 5 6 7 8 9 10

SPR2 MOM XX MOM YY MOM ZZ SQM4 STR XX STR YY STR XY FOR X FOR Y FOR Z SQM8 See below STM6 See below TBC3 STR XX STR YY STR XY MOM XX MOM YY MOM XY TCBM FOR XX TOR XX MOM YY MOM ZZ SH XY SH XZ TCS6 STR XX STR YY STR XY MOM XX MOM YY MOM XY SH XZ SH YZ TCS8 STR XX STR YY STR XY MOM XX MOM YY MOM XY SH XZ SH YZ TET4 STR XX STR YY STR ZZ STR XY STR YZ STR XZ TE10 STR XX STR YY STR ZZ STR XY STR YZ STR XZ THX3 STR RR STR ZZ STR HH STR RZ STR ZH STR RH THX6 STR RR STR ZZ STR HH STR RZ STR ZH STR RH TRB3 MOM XX MOM YY MOM XY NOD SH

TRM3 STR XX STR YY STR XY TRM6 STR XX STR YY STR XY TRX3 SH RR SH ZZ SH HH SH RZ TRX6 SH RR SH ZZ SH HH SH RZ TSP6 See below TUBE FOR XX SH QY SH QZ TOR XX MOM YY MOM ZZ WAP8 FLOW STRESS FLOW SHEAR WARP X WARP Y WARP Z EDGE NX EDGE NY EDGE NZ WAPT FLOW STRESS FLOW SHEAR WARP X WARP Y WARP Z EDGE NX EDGE NY EDGE NZ

Abbreviations

STR - STRESS FLW - FLOW MEM - MEMBRANE SH - SHEAR MOM - MOMENT FOR - FORCE TOR - TORQUE

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BAX3, SQM8, STM6 and TSP6 Elements

Element Stress Numbers

BAX3 1/9 FOR XX

2/10 STR XX

3/11 SH QY

4/12 SH QZ

5/13 TOR XX

6/14 MOM YY

7/15 MOM ZZ

8 EDGE FLOW

SQM8 1/7/13/19 25/31/37/43 STR XX

2/8/14/20 26/32/38/44 STR YY

3/9/15/21 27/33/39/45 STR XY

4/10/16/22 28/34/40/46 FOR X

5/11/17/23 29/35/41/47 FOR Y

6/12/18/24 30/36/42/48 FOR Z

49-54 CENTROID

55/61 67/73 EDGE FOR

56/62 68/74 EDGE FLOW

STM6 & TSP6

1/7/13 19/25/31 STR XX

2/8/14 20/26/32 STR YY

3/9/15 21/27/33 STR XY

4/10/16 22/28/34 SH X

5/11/17 23/29/35 SH Y

6/12/18 24/30/36 SH Z

37-42 CENTROID

43/49/55 EDGE FOR

44/50/56 EDGE FLOW

Abbreviations

STR - STRESS MOM - MOMENT

SH - SHEAR TOR - TORQUE

FOR - FORCE MEM - MEMBRANE

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