Revision History

This document is organized in a way that newer revisions appear at the top. Therefore, section numbers will keep decreasing from top to bottom.

• What's New in STAAD.Pro 2006, Build 1005.US.REL?
• What's New in STAAD.Pro 2006, Build 1004.US.REL?
• What's New in STAAD.Pro 2006, Build 1002.US.REL?
• What's New in STAAD.Pro 2006, Build 1001.US.REL?

What's New in STAAD.Pro 2006, Build 1005.US.REL?

Issues addressed in the Analysis/Design engine

1. AASHTO LRFD, value used in CODES.INI
   The CODES.INI file which was distributed with the previous version of STAAD.Pro 2006 included an incorrect setting for the AASHTO LRFD code such that if the AASHTO LRFD code is selected, the code name was written to the .STD file is 'S136 1994 RCECO'. This has been rectified.
2. AASHTO LRFD, Shear Strength calculation
   The calculations for establishing the shear strength of sections designed with the AASHTO - LRFD have been improved. Under certain circumstances the minor axis shear strength was not calculated and returned a capacity of zero and thus the section showed a ratio of infinity.
3. AASHTO LRFD, Yield Strength
   The reporting of the yield strength in the output file always displayed 36 ksi and not the value specified by the user and used in the design.
4. AASHTO LRFD, web depth to thickness ratio
   If the limiting criteria on an AASHTO LRFD design was web depth to thickness ratio, the output report would report the flange depth to thickness ratio as the limit. This issue has been addressed.
5. ACI-318, Shear + Torsion design
   If the critical condition governing the shear + torsion design is "Minimum Shear + Torsion", the member was treated as having failed in torsion, accompanied by the message "TORSION VALUE TOO HIGH, INCREASE MEMBER SIZE" in the .ANL file. Additionally, there was an incorrect format statement where some units should have been displayed as KIP-INCH, but shown as KIP-FT. Both issues have been addressed.
6. ACI-318, Clear Cover Specification
   If a very large spacing is defined for the top and/or bottom reinforcement, the calculated spacing requirement was becoming negative. If this occurs now, the second of the two expressions in clause 10-4 of section 10.6.4 is used.
7. ANSI/AISC 360-05 Unified code, Code Check
   Memory handling when performing an AISC-Unified code check has been improved to prevent virtual memory errors.
8. ANSI/AISC 360-05 Unified code, Parameter list.
   The parameter UNF has been removed and replaced with UNT and UNB for the top and bottom unrestrained lengths.
9. ANSI/AISC 360-05 Unified code, Track Parameters
   The level of output detail can now be controlled using the addition of a TRACK parameter as with other design codes.
10. US shearwall design
    The design of shearwalls could cause a program crash. This has been addressed.
11. Wind loading on non-orthogonal planes to wind load
    The wind loading routine has been enhanced to ensure that the loading generated on the plane is proprtional to the projected area of that plane.
12. EC3 shear area calculation for pipes and tubes
    The calculation of the shear areas for pipe and tube sections have been improved.
13. NS3472 steel design
    The code has been updated to be in line with 3rd Edition 2001.
14. Uniform load in GZ with perpendicular offset in X-Y plane
    There was a problem in calculating the torsion component when a uniform load is applied along GZ with an offset. This has been addressed.

Issues addressed in the Pre-Processing (Modelling) Mode

1. Releases getting deleted in an incorrect manner
   The routines that update changes on releases has been improved where the change is applied in the 'Member Query' dialog and the same release has been applied to a large list of members.
2. IS:1893 Code Version
   The GUI has been updated to ensure that the IS:1893-2002 Code is displayed even if the DT parameter is not provided in the STD file.
3. Update US Tube database
   The US Tube database has been updated to ensure the sections selected in the GUI are assigned to the model.
4. Update HSS Rectangle database
   The HSS Rectangle database has been updated to operate in the GUI
5. Editing the AREA LOAD value
   Editing Area load commands in the GUI has been improved to prevent a program crash.
6. CHECK SOFT STOREY command
   The GUI has been updated to process this command for the seismic loading.
7. GUI processing of user materials
   Certain material definitions would not get loaded into the GUI and thus could not be assigned to members. This has been addressed.
8. Command parameter MEMBER
   The GUI failed to include the parameter MEMBER on certain commands. This has been addressed such that all commands that require this parameter when adding a list of members, has it added.
9. Mirror Member Orientation
   This feature in the Geometry-Mirror did not work correctly if beta angles had been assigned.
10. Deleting loads
    The GUI has been updated to allow deletion of loads which had previously caused the program to crash.
11. IS800 STIFF parameter
    This is a non valid parameter for the IS800 code which has been removed from the GUI.
12. Editing Seismic loads
    The creation of these commands are not undo-able and would cause the program to crash if the undo option was selected.
13. Mouse scroll of table data
    To be consistent with other aspects of the program and other similar applications, the function of the mouse wheel has been updated to scroll tables in the same way as the wheel is rolled.
14. Node selection by list improved.
    The menu option Select>By List>Nodes, allows a group of nodes to be identified. These would be highlighted, until the dialog was closed. Now all the identified nodes remained selected even after the dialog is closed.
15. Rendered 3D view
    Under certain conditions, the rendered 3D view would not display the sections in the view if no entities were selected. This has been addressed.

Issues addressed in the GUI Post-Processing (Results) Mode

1. Member Query, Concrete Design sheet
   The Member Query dialog has re-introduced the concrete design sheet for members that have been designed with the batch concrete design commands.
2. Beam Force Detail Table.
   Under certain conditions, the Max Bending Moments sheet of this table would display N/A and beam numbers of 0. This issue has been addressed.
3. Plate Contour plots
   These have been greatly enhanced with the following options:- Principal Stresses have been expanded from simply the max top and max bottom to the following,

   Max Top, principal major stress
   Min Top, principal minor stress
   Tau Max Top
   Max Bottom, principal major stress
   Min Bottom, principal minor stress
   Tau Max Bottom
   

   The local stresses have been suitably labeled. An additional option to display a contour of the direct forces resolved into the global directions has been added that operates in a similar manor to the Global Moment contour option.

Issues addressed in the GUI Concrete (RC Designer) Mode

1. RC Designer Mode
   A number of minor updates have improved calculations for shear capacities.

Issues addressed in the GUI Bridge Deck (BEAVA) Mode

1. Naming Decks in 'Bridge Deck' Mode.
   The creation of decks in the Bridge Deck mode requires a deck to be names. If a name is specified as that of an existing deck, then the GUI would crash. This issue has been addressed.

Issues addressed in the GUI Piping Mode

1. Import Piping Supports in Piping Mode.
   The import of pipe support loads from AutoPipe and ADLpipe ADI files has been improved addressing an issue that occurred if the loads exceeded 72 characters.
2. Piping Z UP
   The import of ADI files has been simplified such that the vertical system of the ADI file must match that of the STAAD.Pro model. It is recommended that if a change is needed then the pipe model axis be changed in AutoPipe.
3. AutoPipe macro
   An OpenSTAAD macro has been included in the installation that allows the STAAD structural model to be converted into an AutoPipe NTL batch file and thus included in a stiffness analysis of a pipe run. The macro called 'ToAutoPipe.vbs'is installed in the \spro2006\OpenSTAAD folder.

Issues addressed in the Section Wizard module

1. Canadian Tee Sections
   The Canadian database of sections used in Section Wizard has been updated to correct the dimentional inconsistancies.
2. Parametric Sections - Rolled I shape
   The parameteric function to create a rolled I shape has been updated such that the entry fields match the diagam.

Issues addressed in the help / manuals

1. British Examples
   The British Examples have been added to the online Help system.

What's New in STAAD.Pro 2006, Build 1004.US.REL?

New features and major enhancements

Please refer to the Software Release Report for STAAD.Pro 2006 build 1004 for this information.

Issues addressed in the Analysis engine

1. The engine has been enhanced to use the TRUSS command on Physical Members
2. The effective width computation for the composite beam now includes 1/8 X Length of beam as defined in the AISC manual.
3. Processing of the PMEMBER FORCE command processing improved.
4. SET NOFILE option added to turn off inclusion of key file information at the end of the output file. Note this can also be set in the File>Configuration> input/Output File Format.
5. The default number of primary load cases now considered by STAAD.Pro is 4000, this can be extended if required from the Commands> Miscellaneous >SET NL menu option.
6. Wind load calculations on open frames improved for members that are perpendicular to the plane of the wind load, but not parallel to the global axes.
7. The reported shear areas of tubes have been updated to the following:

   Ay=2*D*TF
   Az=2*WF*TF

8. Improvement in the 'Partial Surface Loading' algorithm.
9. Steady State Analysis command PRINT HARMONIC JOINT DISP fixed.
10. The internal use of standard steel databases has been enhanced so that the engine no longer requires TLB files.
11. Improvement on the definition of a release on a Physical Member by the analysis engine, it was being applied to start/end of all segments, rather than just the start/end of the physical member.
12. AISC-LRFD. For design per the LRFD 3rd edition code, if the axial compression capacity of a single angle is governed by Section 4 on page 16.3-2 of the specifications, then the term Phi_c has to have a value of 0.9, however the STAAD output file indicates it as 0.85. This incorrect display in the output has been rectified as the program used the correct value.
13. AISC-ASD and LRFD. The RATIO parameter was not being considered when determining whether a member has failed the slenderness limit checks. So, if the ratio of Actual KL/r to allowable KL/r exceeded 1, the member was considered to have failed, regardless of the value specified for the RATIO parameter. The program has now been changed so that, if the actual KL/r divided by allowable KL/r exceeds RATIO, only then is the member considered to have failed that check. This change affects design per the AISC ASD and LRFD codes if the RATIO parameter has been specified.
14. BS 5950-2000. Warning added in output for ISECTION and PARAMETRIC defined sections that cannot be designed to the BS5950-2000 code.
15. BS 5950-p5. Torsional Flexural Buckling parameter FLX has been fixed. This was not being set and assumed that the restraint was being provided
16. IS456. The Indian Concrete design, IS456, of models where plate elements were included, caused some parameters not to be used correctly.
17. The optional STARDYNE engine revised to use legacy security systems.
18. Non-linear command is no longer supported.
19. The problem of attempting to a defining a wind load onto an 'Open Framed' structure without any additional member loading has been addressed and is now possible.

Issues addressed in the Pre-Processing Mode

1. Updating the Beta Angles in the beams table has been improved to allow the tab key to apply a change.
2. The US steel database has been enhanced with 82 new TUBE sections as defined in the AISC green book ( 9th edition ), STRUCTURAL TUBING - Rectangular on page 1 - 99.
3. Sections defined in a Prismatic user table are now displayed in a rendered 3D view based on the YD and ZD dimensions.
4. Prismatic user tables of type GENERAL, which are based on a defined Profile Polygon has improved calculation algorithms.
5. Option to copy the data from the Section Properties table has been added to the program.
6. Chinese Pipe Section database enhanced with 9 additional sections.
7. Chinese H sections can be edited from the Property dialog box by double clicking and any other Chinese I or H section can be selected.
8. Canadian Timber database enhanced to allow sections to be used in 3D analysis.
9. American cold formed steel database (AISI) updated with corrected rolling radii.
10. AISC steel database updated with rogue section at the end of the W section list being removed.
11. Additional standard sections added to the European steel database.
12. Weights defined for IBC load definitions are highlighted when selected in the Loads dialog box.
13. The units of loading defined in the Loads Page has been changed to be consistent with the rest of the GUI.
14. The Spectrum command 'Missing Mass' option is now being saved correctly from the GUI.
15. The Loading dialog option to create the FLOOR and ONEWAY LOAD commands has been improved for applying load in the horizontal directions.
16. The definition of moving loads in the GUI has been improved
17. Representation of wind panels displayed when the load case is selected.
18. Option to change the number of Time Steps in a Time History definition has been improved.
19. The IS1893-2002 seismic generator GUI operation has been improved.
20. Improvement in the GUI generation of member distributed and concentrated weights in the seismic weight definitions
21. The loading dialog description improved to clarify the definition of wind applied in -ve axis direction.
22. The GUI dialog for defining and editing seismic masses has been updated.
23. The 'Toggle Assign' option in the Steel Design page of the Pre-Processing Mode has been enhanced to allow commands that have been applied to 'ALL' to be modified.
24. The galvanation indication parameter, GALVA has been added to the Indian IS802 steel design dialog.
25. The Steel Design dialog sheet that is used to define the Australian steel parameter ALB has been enhanced so as to allow negative values to be entered.
26. The MAIN parameter has been added to AISC-LRFD steel design dialog.
27. The application of the BS5950-2000 steel design parameter, SWAY has been modified to prevent the GUI from crashing.
28. The UNIT command when defined before the TAKE OFF command is now saved correctly.
29. Trapezoidal load data on plates is now saved correctly form the GUI.
30. Physical members can now be defined on all pages in the Pre-Processing Mode.
31. Offsets applied to Physical Members are correctly applied to the member rather than the individual beam segments.
32. Loads applied to Physical Members are now saved in a better format.
33. The formation Physical Member functionality improved for multi-segment members.
34. The dialog from the menu item Tools> Cut Section… has been updated by showing units when defining the range in a given plane.
35. The functionality behind the tool for checking and removing duplicate nodes has been improved when the nodes are included in one or more plate definitions.
36. The View>Options… dialog box, Force Units sheet has been improved to allow a 0 decimal place option to be set for viewing the resulting analysis moments.
37. The status bar is now used to indicate the progress of entities that are renumbered to indicate how far the renumbering has progressed.
38. The Mode bar below the menus and top toolbars, is now correctly reset when a new file is started.
39. The grid dialog box has been enhanced to prevent crashing when setting up radial grids on plates.
40. The ACI shearwall design parameter END PANEL is now correctly added when setting up a design parameter group in the GUI.
41. Splitting beams that have eccentric UDL loads applied has been enhanced to ensure that the loading is applied to all segements after the split.
42. The right click menu option to create a mesh when one or more plates have been selected, has been renamed to 'Generate Plate Mesh…' to be consistent with the main menu option.
43. Parametric Modeling has been enhanced to ensure that if the mesh is incorrectly defined by closing the boundary (clicking on the first node of the boundary) with only one other node defined, then the mesh is cancelled rather than crashing the program.
44. The Orientation symbols are better displayed when the location of centre of rotation has been changed from the default.
45. Large parametric model data blocks are written better into the STD data file.
46. The Release Specification dialog has been enhanced with a note to identify that '0.0' is a Full Moment restraint and '1.0' is a Full Moment Release, to assist in defined a 'Partial Moment Release'.
47. The Inverse Geometry selection functionality improved.
48. Inserting nodes in members with offsets has been enhanced to allocate new offsets to the newly created beams.
49. The check routines used in the toll 'Check Overlapping Collinear Members' has been improved.
50. If all the degrees of fixity are removed from a release on the end of a beam, then the release itself will also be removed.
51. There has been an improvement in option to select plates parallel to Z-X plane.
52. Improved undo operation to address crash when undoing insertion of nodes into beams with offsets defined.
53. There has been an improvement in the error checking in the definition of the Pushover Analysis of Spectrum parameters whilst the file is being read into the GUI.
54. There has been an improvement in the error checking in the definition of site category in the Pushover Analysis whilst the file is being read into the GUI
55. The display of co-ordinates values in the Member Query dialog box has been improved.
56. It is now possible to highlight 'IGNORE STIFFNESS ELEMENT' in the Specification dialog.
57. The GUI creation of Multi-linear springs improved to allow the spring data to be written over up to 11 lines.
58. Files with a period (.) in the name now display a preview in the open dialog.
59. The crash of the GUI caused by deleting warped plates has been fixed.
60. A 'Cancel' button has been provided whilst generating 3D views to abort creation of the view on very large models.
61. The 'Cable Analysis' dialog has been updated to allow definition of Eq-Iterations of 10 and 500 as per the command structure.
62. Beta angles that have been changed with the Member Query dialog that are subsequently copied, now have the beta angle copied correctly.
63. The Assigning of a 'No Support' object to remove a support definition in the GUI sometimes caused the program to crash. This issue has been fixed.
64. A warning has been added if an attempt is made to copy multiple entity types onto the clipboard, which the program does not support.
65. The Rendered 3D views have been enhanced to display user Profile Polygon sections.

Issues addressed in the Post-Processing Mode

1. The 'Design Results' table is accessible from the menu item View> Tables….
2. The annotation of reactions in the GUI is better controlled using the font setting in the 'Annotation' sheet of the View> Options... dialog.
3. The Design Results sheet from the 'Diagrams' dialog box has an improved range when the 'Detailed Diagram' is selected.
4. Stress diagrams for cold formed steel sections are now possible
5. The Results Setup option to set the range of results enhanced with option to set the range of Solids as well as beam and plate objects.
6. The menu item Results>Slab Reinforcement has reintroduced the option to include Wood and Armer resolution of the MX moment.
7. The contouring for plate stresses based on corner stresses has been improved.
8. The unit display for the Member Query dialog moment diagrams has been improved when the units are changed from the structure base units.
9. There has been an improvement in the way displacement values are displayed in the Member Query dialog.
10. The automatic setting of custom limits in the 'Diagrams>Design Results' dialog has been improved.

Issues addressed in the Steel Design Mode

1. the connection design has been enhanced so that shear connections can be created to a AISC ASD design on beams ends that have releases defined.
2. The BS5950-2000 Brief has been updated with clearer definition of the WELD parameter.
3. The management of Physical Members created in the Steel Design Mode has been improved. It is now possible to select a range of physical members using the Physical Member Cursor in the graphical window or the Physical Members Table and add them to the STD file by right clicking and selecting the menu option ‘Add Member(s) to the STAAD Input file’, rather than being forced to make that decision when the members are first formed.’

Issues addressed in the Concrete Design Mode

1. 1. There have been two slight improvements to the RC Designer Main Reinforcement Window
   1. When the cursor goes over the section mark, then the cursor shape changes to indicate that the section mark can be dragged.
   2. Double clicking on the top horizontal divider, the window should auto-scale to fit the entire beam in the width of the window."
2. The RC Designer Earthquake check printing has been improved to allow previewing the result tables.
3. The RC Designer algorithm used in the creation of members and spans has been improved.
4. The limit of load case names being longer than 30 characters has been addressed.

Issues addressed in the Advanced Connection Design Mode

1. The Right click menu updated of the Connections Table in the Advanced Connection Design Mode to allow AISC ASD designs to be performed.

Issues addressed in the Advanced Slab Design Mode

1. The test for locating a copy of RAM Concept on the local computer has improved for use with the Advanced Slab Design Mode.

Issues addressed in the Editor

1. When editing files in the editor, the option to block comment adds a comment character

   (*)

   at the start of each line, including those that have already been marked and thus easy to block uncomment at a later time.

Issues addressed in Printing

1. A User Report that included a Steel Design to AISC-LRFD incorrectly indicated that the code was 1994, it has been corrected to state that it is to 2001.
2. The Plate Query dialog improved with plate number on all sheets to assist in identification on a printout.
3. There has been a general improvement in the management of steel design items to be included in a user report.

Issues addressed in Section Wizard

1. 1. The WT sections in the ASTM database have been updated and now indicated as parallel flange sections rather than tapered flange sections.

What's New in STAAD.Pro 2006, Build 1002.US.REL?

New features and major enhancements

Please refer to the Software Release Report for STAAD.Pro 2006 build 1002 for this information.

Issues addressed in the Analysis engine

1. "Exception Access Violation Raised : Aborting analysis" - message comes up when the command "Ignore Stiffness Element" or inactive plate is specified. Additional checking on structural integrity has been added to trap this problem.
2. "PMEMBER OFFSET" is now addressed by the analysis engine.
3. Physical Member RELEASE is now addressed by the analysis engine.
4. Plate temperatures could be mishandled if solids were also in the model.
5. Shear area corrected for sections with unequal top & bottom flanges.
6. Temperature loading corrected for cables in nonlinear Perform Cable Analysis.
7. Floor Load, Oneway Load, Open Wind Load & Snow Load could incorrectly report that a load was applied beyond the of the beam.
8. Aluminum Take Off added.
9. Full geometric stiffness now used in Perform Cable Analysis

Issues addressed in the Pre-Processing Mode

1. Composite User Wide Flange and ISECTION Sections. The GUI has been enhanced so that it understands the command structure for a composite user wide flange section as defined in the International Design Codes Manual section 2B1.11
2. FIXED BUT support definition is retained after applying a Multi-linear support spring.
3. Structural Tool Tip for surface entity correctly displays defining node numbers.
4. Current length units added to the 'Select By Range' dialog boxes.
5. Display of multiple loading items on Physical Members has been improved.
6. Parameters MAIN and TMAIN added to AISC ASD and LRFD Steel Design dialog box.
7. AISC calculation of un-braced effective length factor (KZ) has been improved.
8. The 'Tools>User Tools>' menu list is updated to display any items that have been added using the 'Tools>Configure User Tools...' dialog. Note these are also displayed when the 'User Tools' toolbar item is clicked.
9. The GUI Section Properties Values table has been updated to correct incorporate the units.
10. STAAD.Pro no longer associates itself with *.ASA files
11. Section Properties for the US HSST and HSSP have been added for use in the GUI.
12. The editing of a Master/Slave command has been improved so that an additional command does not get added.
13. User Table- Double Angles. If a user designs a beam that has been defined as a Double Angle from a User table, then they need to provide an 11th parameter in their section parameters to define the RVV value (see International Design Codes Manual section 2B.4). The GUI has been enhanced to support this additional parameter.
14. The parameter GALVA has been added to the GUI for the IS 802 code to indicate whether the section is painted or galvanized.
15. The GUI now traps Floor load commands which have been applied using groups that have not been defined as FLOOR groups.
16. The GUI now traps where UDL loads have been defined where the end position of the load occurs before the start position.
17. The GUI now traps the error of missing the direction parameter in the command in which a UNI load is applied.
18. The AITC parameter CV was being generated multiple times when a file was saved. This has been rectified.
19. The GUI reports that CODE AAHSTO is an error for the concrete design block.
20. The Parametric model data manipulation of multiple definitions has been improved.
21. The Steel Design Dialog now assigns a STEEL TAKE OFF command to the selected beams to allow for partial take offs.
22. The display of floor loading that is applied in directions that are not perpendicular to the surface has been improved, e.g.

    YRANGE 8 10 FLOAD -1 GZ

23. User Property Table calculation of the PY property of a section defined using 'Define Profile Polygon' improved.
24. The AITC timber code parameter CV is not duplicated when the file saved from the GUI.
25. Structure Wizard import of STD files clarified unit statement.

Issues addressed in the Post-Processing Mode

1. Calculation of corner stresses for pipe sections reported in the Beam Combined Axial and Bending Stresses table and the 3D Stress Contour dialog have been improved.
2. The menu Item Report>Beam Stresses has been improved for printing out the table that is displayed.

Issues addressed in the Steel Design Mode

1. The calculation output for a BS 5950 has been updated.

Issues addressed in the Concrete Design Mode

1. The Page and Mode buttons have been improved to allow the page to be reloaded by a single click.

Issues addressed in the Advanced Connection Mode

1. The GUI link to the Advanced Connection Design mode has been re-established.
2. The definition of shear connections has been improved to allow re-editing of the basic definition.
3. The definition of all connections allow the code to be specified once the column section has been defined.
4. The checks on a beam/brace to column connection has been improved to ensure that the alignment of the beam is in the plane of the web/flange of the column.

Issues addressed in the Editor

1. The Editor would crash if the user specified a DELETE MEMBER command and later in the file proceeded to refer to those members. The Editor now traps such occurrences.

Issues addressed in Section Wizard

1. Equivalent Section. The Section databases available for the Section Builder and FreeSketch modules are also now available for use with the Equivalent Section module.

Issues addressed in Pentad

1. The Pentad application object has been enhanced to ensure that that when the object is closed, the model databases are released allowing other applications to access them.

What's New in STAAD.Pro 2006, Build 1001.US.REL?

New features and major enhancements

Please refer to the Software Release Report for STAAD.Pro 2006 for this information.

Errors corrected in the Analysis engine since STAAD.Pro 2005, Build 1003.US.REL

1. For composite decks defined using the

   START DECK DEFINITION
   END DECK DEFINITION

   block of commands, if the DIRECTION command is specified before the COMPOSITE command as shown in the following example

   START DECK DEFINITION
   _DECK 3D1
   PERIPHERY 171 170 168 167 84 184 183 182 181 180 179 178 177 176 185 186 188 -
   189 200 TO 206 141
   DIRECTION 1.000000 0.000000 0.000000
   COMPOSITE 209 207 198 196 194 192 190 146 145 92 91 90 89 86 171 170 168 167 -
   185 186 188 189
   OUTER 195 122 124 196
   DIAZ 0.625000

   the analysis engine may stop with an Access Violation message. The workaround is to specify the DIRECTION command after the COMPOSITE command.
2. For composite decks defined using the

   START DECK DEFINITION
   END DECK DEFINITION

   block of commands, there may be an error in the calculation of self weight.
3. For design of HESS sections per the LORD code, in the check involving the interaction of axial force, flexure, shear and torsion, the strength reduction factor was not applied to the flexure term when the flexural strength is governed by the product of elastic section modulus and yield strength. It resulted in a slightly unconservative ratio if that equation turned out to be critical.

Changes made to the Analysis and Design engine since STAAD.Pro 2005, Build 1003.US.REL

1. If the Concrete Density term CD is entered as 0 for composite members as shown in the following example

   2 TA CM W21X44 FC 3000.0 CW 96.0 CT 4.0 CD 0

   the program will now report that condition as a warning and reset it to its default value. This change will affect the selfweight calculation for models in which the above condition is present.