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Tekla Structural Designer 2017 Service Pack 2

Last updated November 20, 2017 by Tekla Structural Designer Development Team tekla-product-development-tsd-team-ug@trimble.com

Tekla Structural Designer 2017 Service Pack 2

This release will upgrade your Tekla Structural Designer installation to Tekla Structural Designer 2017 Service Pack 2 version number and should be installed to ensure optimum function of the program.   It includes a number of issue resolutions as detailed below.

If you are updating from a version earlier than Tekla Structural Designer 2017 (version you can find details of enhancements and fixes included in all previous releases in Tekla User Assistance (TUA) and Tekla Downloads.  You will find all the main releases listed in the Knowledage base area of TUA under Release notes while those for Service Packs can be found under Updates.  Links to release notes together with the version number can also be found in Tekla Downloads (login required).

Licensing & Installation

  • Licensing - no new license is required for this version.
  • Installation - This service pack requires Tekla Structural Designer 2017 to be installed and will upgrade this to version
    • Previous Versions and file compatibility - Files from all previous versions can be opened in Tekla Structural Designer 2017 SP2 however note that once saved they cannot then be opened in an older version.  If you wish to retain this option we therefore recommend using the File > Save As… option to save a new version of the file and retain the original.

Issues with Associated Bulletins

  • Analysis -  Second-order amplified forces method - For all Head Codes which feature a Second-order amplified forces analysis method, when selected and applicable the amplification factor was not applied to the analysis results for non-linear models, potentially producing incorrect and un-conservative analysis and design results.  Affected Head Codes were; Eurocode, BS (all countries for both) and Australia.  It is expected the most commonly affected models would be those with Tension Only bracing.  This issue is now fixed.  For more information please see Product Bulletin PBTSD-1705-1 (53287).
  • Loading - Perimeter Load - this issue relates to all Head Codes.  In some circumstances perimeter loads were not correctly applied in the Grillage chase-down and 3D Building analyses.  Where the issue occurred it would be apparent from errors in the Load Summary check.  This issue is now fixed.  For more information please see Product Bulletin PBTSD-1705-2 (13912).
  • Slab Design - Punching Shear Checks -  BS and Eurocode Head Codes.  For checks located at edges and corners of slabs, the full internal shear perimeter depth and breadth - termed Dperim and Bperim  respectively - were incorrectly used instead of the effective (reduced) dimensions.  For edge column checks this could result in an incorrect and unconservative applied shear stress value ( BS Head code).  The issue can also affect the reinforcement ratio used for punching checks within slab patches for both edge and corner cases (BS and Eurocode).  Note that this issue did not affect the shear perimeter length un which was calculated correctly.  This issue is now partially fixed.  For more information please see Product Bulletin PBTSD-1705-3 (13785).

Enhancements & Fixes

General & Modelling

  • Sub Structures - Selection - the Window selection method (clicking and dragging a window to enclose/intersect objects) did not function correctly.  This issue applies only to Tekla Structural Designer 2017 SP1 (v17.0.1.41) in which it was introduced (13914).
  • Review View - UDAs - a program error would occur when in Review mode and a member with an applied UDA was selected.  This issue applies only to Tekla Structural Designer 2017 SP1 (v17.0.1.41) in which it was introduced (13910).
  • Revisions - Project Wiki - rarely in some models a program error would occur when attempting to view Revision changes via Home > Project Wiki > Changes (13940).
  • Slabs - Flat Slabs - modelling speed has been improved when creating and editing flat slab items in models which include a large number of column drops (13920).
  • Portal Frames - Ties - a new Characteristic type “Tie” is added for these.  Formerly the “Brace” characteristic was used which could cause a program error when editing the tie section (53312).
  • Columns - All materials - the column property “Imposed Load reductions” - which is not currently operative - is now removed.  This issue only applies to version 2017 (v17.0.0.37) and its first service pack in which this setting was first exposed (53235).

Analysis & Results

  • Analysis:
    • Grillage Chase-down - where a Grillage chase-down analysis was performed in models containing steel braces - a relatively rare circumstance - a process error could occur during the calculation of chase-down combinations causing analysis to terminate (13854).
    • Solver model - an error could occur during the solver model display process for particularly complex geometries involving meshed slabs and walls which would manifest as a program error when attempting to view the solver model or analysis results (13752).



  • Separate Analysis & Design - this issue did not affect the usual design process undertaken via the “Design...” buttons on the Design tab of the ribbon, or use of the Analyze > Analyse All (Static) procedure, as these automatically analyse all required load cases and (active) combinations.  It only relates to undertaking design of individual elements or structure parts (via right-click context menu design options) as a separate process after running an individual analysis.  In this case, if load cases were not included in the analysis run the results of which were required for design, the design result could be incorrect  This issue could affect results for both steel and concrete design and the Floor Vibration Check.  We expect this is an uncommon procedure and circumstance hence this issue will have affected relatively few customers.  (53217, 53249, 53250).
  • Wind Drift:
    • In Design > Options > Wind Drift, a new “Check wind cases only” option is added (default On).
      • With the setting On, the Wind Drift check only considers the effects of the wind load case(s) in wind combinations. 
      • With the setting Off, as previously, the check considers the effects of all load cases in wind combinations (which would include drift induced by gravity loads).
    • The Wind Drift checks previously used results from the analysis method selected in Design > Analysis options.  If the selected option were second order then the drift displacements would include second order effects.  In addition, for US Head Code models, the second order analysis results would also include the effect of the Reduced stiffness factor (of AISC 360-05 7.3(3) & (4); AISC 360-10 C2.3(1)) the default value of which is 0.800.  These two issues could result in over-conservative check results.  Wind drift checks now only use results from a 1st order linear analysis* (with no Reduced stiffness factor), which is always run in addition to the method nominated in Design > Analysis options (53252).
      • *Note that for non-linear models with Tension Only bracing it is essential that the “X Brace” pattern is used to input the braces as brace pairs rather than creating them individually.  For linear analysis one of the braces in a brace pair is automatically inactivated, ensuring that the model’s lateral stiffness, and hence lateral drift, is reasonably correct.  If braces are input individually this will not be the case.
    • The check is now performed only for (wind) combinations while previously wind load cases were also subject to a Wind Drift check.  Furthermore the check now uses the combination SLS (Service Level) factors - which can be < 1.0 - where previously a factor of 1.0 was used for all wind cases in a combination.
      • Check results are no longer available/ reported for wind combinations for which the “Service” setting is unchecked (indicating that it should not be checked for Serviceability states).  Previously the wind drift check was still performed for such combinations albeit all the deflections and drifts used were zero and hence the check status was always a pass.
  • Slab Design - Punching Shear:
    • Analysis results used for punching shear checks are now consistent with those used in slab panel and patch design.  Previously some unnecessary analysis results were being checked such as those for FE Chase-down for lateral combinations (53234).
    • A program error could occur when switching the model Head Code between BS and Eurocode subsequent to adding punching checks and running the Design Punching Shear process (53224).
  • Foundation Design - Pad Bases - Sliding Resistance - in some circumstances a negative value of sliding resistance due to friction (a physical impossibility) could be reported.  A lower limit of zero is now correctly applied to the sliding resistance to prevent this (53229).
  • Steel Design - BS & Eurocode  - Combined axial + bending check (for all applicable characteristics)  - in some circumstances the check did not correctly apply the ignore forces level (set in Design > Options > Design Forces > ) for moments (53208).

Head Code BS

  • Steel Design - Beams:
    • Westok Cellular beams - the design procedure for Westok Cellular beams failed for this Head Code causing the overall Design process to be interrupted.  This issue applies only to Tekla Structural Designer 2017 SP1 (v17.0.1.41) in which it was introduced (13909, 13950).
    • Web Openings:
      • In some circumstances a design error occurred producing a Process Window error “Object reference not set to an instance of an object” and preventing some web openings checks from completing (53330).
      • The critical design combination was not correctly flagged with the “!” symbol in the design details (53329).
    • Combined axial + bending check - in some circumstances, where the major and minor axis strut buckling effective lengths were different, the axial (compression) force used in the check was taken as the maximum axial force over the major length, rather than the maximum of the axial force over the major length and the minor length (51590).
  • Isolated Pad Bases - Sliding Check - this now uses the results of the SLS (service) combination (Including ILR).  Formerly those of the ULS (strength) combination were used rendering the check over-conservative.  The FOS (factor of safety) is unchanged at 1.5.(13505).

Head Code EC

  • Steel Design - Beams - Web Openings - the Review View graphical design pass/ fail status did not correctly reflect the web post buckling utilisation ratio (13925).
  • Floor Vibration Check - Composite Floors - the dynamic modular ratio of the slab used in the Floor Vibration Check is changed to be consistent with that used in the Composite beam Natural Frequency check.  This has a marginal effect on the overall results of the check (53273).
  • Sway Checks - in some circumstances, for models set to use the P-Delta Amplified Forces analysis method, columns with alpha_crit >> 10 could display a spurious warning status and the sway details warned incorrectly that Kamp was not applicable/ applied (53233).
  • Concrete Design - Beams - tolerance has been introduced to prevent the additional tension reinforcement (for shear) check being unnecessarily performed where small drops in shear occur at beam ends (53118).

Head Code US

  • Isolated Pad Bases - Sliding Check - for ACI LRFD combinations the sliding check now uses the results of the SLS (service) combination (Including ILR).  Formerly those of the ULS (strength) combination were used rendering the check over-conservative .  Checks for ACI ASD combinations use the Strength combination (Including ILR).  The FOS is unchanged at 1.5 (13505).

Reports & Drawings

  • Detail Drawings - Concrete Beams - the detail drawing would fail to generate for some more unusual arrangements of bar geometry (13887).


The number in brackets after an item denotes an internal reference number.  This can be quoted to your local Support Department should further information on an item be required.

32bit (x86) and 64bit (x64) Versions

Service packs are available for both 32bit (x86) and 64bit (x64) versions of Tekla Structural Designer. Before downloading, check which version you have currently installed via the Information button at the top right of the Tekla Structural Designer window, then download the appropriate service pack

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