Xtract manual

XTRACT User Manual Version 12.1

ANSYS, Inc. Southpointe 275 Technology Drive Canonsburg, PA 15317 [email protected] http://www.ansys.com (T) 724-746-3304 (F) 724-514-9494

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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 12.1 November 2009

Modifications: The following modifications have been incorporated: Section

Page(s)

Update/Addition

Explanation


Contents

XTRACT User Manual 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


i

XTRACT User Manual

Introduction

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.


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Introduction

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2.

Data Formats

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. integer

KEYWORD

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.

and

ELEM

1 4 6 TO 12 16 19 TO 22

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


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Data Formats

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. ELEM

elno

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. STRESS

snum

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. NODE

node

Parameters


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NODE

: keyword

node

: list of node numbers (Integers)

Data Formats

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

loadcase

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. NSIGF

nsig

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.


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Data Formats

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

sect

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. JOIN

node

elno

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.


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Data Formats

STOP

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.


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Data Formats

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3.

Examples

Examples

3.1. Example 1: Printing Stresses from an ASAS Analysis SYSTEM

DATA

AREA

30000

PROJECT PRJ7 JOB POST TITLE TEXT

DECK LEG STRESSES ALL LOADCASES UNITS KN AND MM

TEXT TEXT

ACO PLATFORM RE-ANALYSIS JOB NO 738-420

STRUCTURE

JAC7

OPTIONS END END ELEM 1036 CASE ALL

102

1086

1022

STOP

3.2. Example 2: Component Analysis, Printing Stresses and Displacements in the Local Axis System SYSTEM DATA PROJECT PRJ1

AREA

30000

JOB POST TITLE PILE DISPLACEMENTS IN LOCAL AXIS SYSTEM STRUCTURE JAC3 COMPONENT JAC3 PILE OPTIONS LOCL END END ELEM CASE

22 1

24 2

32 46

34 9

11

STOP

3.3. Example 3: Component ASAS Analysis Printing Displacements SYSTEM

DATA

AREA

60000

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


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Examples

NODE NODE

271 103

272 TO

NODE NSIG

1037 8

1039

CASE

1

3

273 108

7

9

STOP


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Examples

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Appendix A

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.

SYSTEM

DATA AREA

PROJECT

pname

JOB

POST

TITLE

title

TEXT

text

STRUCTURE

sname

COMPONENT

sname

OPTIONS

memory

tree

option

END

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)


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SYSTEM

DATA AREA

Appendix A

memory

Parameters SYSTEM

: keyword

DATA AREA memory

:

keyword

: 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 SYSTEM

A.3

DATA AREA 80000

PROJECT Command

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

pname

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


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A.4

Appendix A

JOB Command

To define the type of analysis being performed. Compulsory. JOB

POST

Parameters JOB

: keyword.

POST

: keyword.

Example JOB

A.5

POST

TITLE Command

To define a title for this run. Recommended. TITLE

title

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

A.6

THIS IS AN EXAMPLE OF A TITLE LINE

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.


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TEXT

Appendix A

text

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 TEXT

COMMAND IS SPREAD 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. STRUCTURE

sname

Parameters STRUCTURE : sname

keyword

: structure name identifying which existing structure is to be accessed from the project defined on the PROJECT command. alphabetic)

(Alphanumeric, 4 characters, the first character must be

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.


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Appendix A

COMPONENT

sname

tree

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

1.

Example COMPONENT SHIP PORT BULK

A.9

OPTIONS Command

To define the control options for this run. Optional. OPTIONS

option

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


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A.10

Appendix A

END Command

To terminate the preliminary data. Compulsory.

END

Parameters END

: compulsory keyword


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Appendix B

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.


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Appendix C

Appendix C. - Options C.1

C.2

Miscellaneous Options Option Name

Application

DATA

Performs data checking only

NOBL

Do not print the XTRACT title page

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


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Appendix D

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.


Page D-1

Element

1

AHH2 ASH2

MEM SS MEM SS

BAX3

See Below

2 MEM HH MEM HH

3

4

SHEAR SH MOM MS

MOM MS MOM MTH

5 MOM MH SHEAR Q

6 TWIST T

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 BR32

STR XX STR XX

STR YY STR YY

STR ZZ STR ZZ

STR XY STR XY

STR YZ STR YZ

STR XZ STR XZ

CB15

N/A

CK11

K1

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

7

8

SHEAR QS

SHEAR QT

9

10

XTRACT User Manual


Stress Number

K2

Appendix D

Page D - 2

Element

1

2

3

4

5

6

GCB3 GCS6

FOR XX STR XX

MOM YY STR YY

MOM ZZ STR XY

TOR XX 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

7

8

9

10

XTRACT User Manual


Stress Number

Appendix D

Page D - 3

Element SPR2 SQM4

1

2

MOM XX STR XX

3

4

5

6

MOM YY STR YY

MOM ZZ STR XY

FOR X

FOR Y

FOR Z

7

8

9

10

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 TRM6

STR XX STR XX

STR YY STR YY

STR XY 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

Page D - 4

STR SH FOR

-

STRESS SHEAR FORCE

FLW MOM TOR

-

FLOW MOMENT TORQUE

MEM-

MEMBRANE

Appendix D

Abbreviations

XTRACT User Manual


Stress Number

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

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

43/49/55

44/50/56

CENTROID

EDGE FOR

EDGE FLOW

STM6 & TSP6

XTRACT User Manual


BAX3, SQM8, STM6 and TSP6 Elements

Abbreviations STR

-

STRESS

MOM

-

MOMENT

SH

-

SHEAR

TOR

-

TORQUE

FOR

-

FORCE

MEM

-

MEMBRANE

Appendix D

Page D - 5


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