Product bulletins

Tekla Structural Designer product bulletin July 2020 (PBTSD-2007-1)

Résumé of issue The issue relates to loads produced by the Wind Wizard for the Finland (Eurocode) Head Code.  For Terrain category 0 (Sea), the calculated peak velocity pressure qp is incorrect and too low, thus producing wind loads which are not conservative.  Loads for other Terrain categories are not affected. Occurrence This issue relates to Tekla Structural Designer 2018 (version 18.0.0.32  released in March 2018) - in which loading and design to the Finland Eurocode National Annex (NA) was first implemented - and all subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Connection Designer product bulletin July 2020 (PBTCD-2007-1)

Résumé of issue This issue relates to Tekla Connection Designer (TCD) and the design of Simple Connections to the Eurocode (Recommended and UK and Irish NA’s).  For certain double-sided connection configurations, Check 14 - Structural Integrity - Supporting column web is incorrectly omitted.  We note that this check would only be likely to be critical for connections with a large difference between the beam tie forces. Occurrence This issue relates to all versions of  TCD and the former Fastrak Simple Connection Design application since Fastrak Release 19 (software update April 2010) in which
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin May 2020 (PBTSD-2005-2)

Résumé of issue This issue relates to the new feature introduced in TSD 2020 for ‘Shear only walls’. The current modelling formulation, as the name suggests, is restricted to shear resistance and shear stiffness behaviour only. This has the limitation of failing to report the vertical ‘push-pull’ effects at the ends of the panel that would be expected to be present to resist overturning. Occurrence This issue relates to TSD 2020 (version 20.0.0.129 released in March 2020) and all subsequent Service Packs.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin May 2020 (PBTSD-2005-1)

Résumé of issue The issue relates to the US Head code and the design of concrete columns to the 2014 edition of ACI 318 (years 2008 and 2011 are not affected).  The issue affects the slenderness limit of section 6.2.5 for braced columns and the calculation of the uniform moment factor Cm for columns classified as slender, and could result in an unconservative design in some circumstances. Occurrence This issue relates to Tekla Structural Designer 2018i (version 18.1.0.45 released in Sept 2018) - in which ACI 318-14 was first implemented - and all subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin March 2020 (PBTSD-2003-1)

Résumé of issue This issue relates to Snow Loading and the US Head Code with the Snow Load Action Code set to ASCE7 2016 only. For Roof Projection and Parapet Snow Drift loads to Clause 7.8 of ASCE7-16, the Importance factor value was used directly in the calculation of the drift height hd rather than its square root per the equation of Figure 7.6-1. This could produce unconservative drift load values for some Risk Categories. Occurrence This issue relates to Tekla Structural Designer 2018i (version 18.1.0.45 released in Sept 2018) - in which loading to ASCE7-16 was first introduced - and all
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin January 2020 (PBTSD-2001-2)

Résumé of issue This issue relates to the analysis results for some steel members using Angle sections for all Head Codes.  Analysis results could be incorrect for steel members only in the following very specific circumstances: The member section was a single angle. The member characteristic was one of the following; Column, Gable Post or Parapet Post. When the member was not set to be "continuously restrained" We expect that these conditions existed in very few models and, even in the unusual case where it did apply the overall effect was likely to be negligible. Occurrence This issue
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin January 2020 (PBTSD-2001-1)

Résumé of issue The issue relates to reporting of some RSA combination result values from RSA Seismic Analysis for all Head Codes.  The member end forces reported in some areas of the program could be incorrect - please see the issue details for more information.  Note that the issue did not affect any design checks carried out within TSD. Occurrence This issue relates to Tekla Structural Designer 2015 (version 15.0.0.40 released in Mar 2015) and all subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin November 2019 (PBTSD-1911-1), Tekla Portal Frame Designer product bulletin November 2019 (PBTPFD-1911-1)

Résumé of Issue This issue relates to integration of Tekla Structural Designer (TSD) & Tekla Portal Frame Designer (TPFD) for the BS and Eurocode Head Code.  In some circumstances loads on a Portal Frame in Structural Designer were not correctly exported to Portal Frame Designer.  Loads could be duplicated and/ or act in the opposite direction, which could result in design forces being either increased or reduced depending on a number of factors.  Where the issue occurred it would usually be apparent from markedly different forces and deflections in Portal Frame Designer compared to those
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin October 2019 (PBTSD-1910-1)

Résumé of issue This issue relates to the design of Pile Caps to the Eurocode (All Country NA’s).  For the shear check and the reduced design shear load near to supports per EN 1992-1-1 Cl. 6.2.2(6), the lower limit of  av = 0.5d for checks undertaken at av ≤ 0.5d was not applied which could result in an unconservative design result. Occurrence This issue relates to Tekla Structural Designer 2016i (version 16.1.0.78 released in Sept 2016) and subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin May 2019 (PBTSD-1905-1)

Résumé of issue This issue relates to the design of Isolated Foundations to Eurocode and BS Head Codes.  For column punching shear checks the perimeter length of loaded areas  was not always the shortest possible.   The issue would only occur for base/ cap geometries which placed the column loaded area at or beyond the foundation edges/ corners. Occurrence This issue relates to Tekla Structural Designer 2016 (version 16.0.0.35 released in March 2016) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin February 2019 (PBTSD-1902-5)

Résumé of issue This issue relates to all Head Codes featuring Seismic analysis and design and affects only models with steel seismic force resisting systems (SFRS) and the auto-design process, not check-design.  Where Vibration analysis is selected for the fundamental period and steel members of the SFRS are set to auto-design, a subsequent  Vibration analysis is not performed after changes in section size during the design process.  This can result in an underestimate of the seismic forces and hence an unconservative design.  The issue does not affect concrete models since sections sizes
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin February 2019 (PBTSD-1902-4)

Résumé of issue This issue relates to loads produced by the Seismic Wizard for the Indian Head code only. For the RSA method, the fundamental period from Vibration Analysis was used to determine the seismic torsion loads. This had the potential to produce unconservative loading. Occurrence This issue relates to Tekla Structural Designer 2015i (version 15.1.0.70 released in Sept 2015) and all subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin February 2019 (PBTSD-1902-3)

Résumé of issue This issue relates to the seismic design of reinforced concrete columns for the US Head Code and ACI 318-14 only. For columns assigned to Intermediate Moment Frames and the seismic shear design/ check of seismic combinations, the value of the largest shear force in a stack with increased earthquake effect was incorrectly set to zero. This had the potential to produce an unconservative check where shear was critical. Occurrence This issue relates to Tekla Structural Designer 2018i (version 18.1.0.45 released in Sept 2018) and all subsequent releases.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin February 2019 (PBTSD-1902-2)

Résumé of issue This issue relates to the seismic design of reinforced concrete columns for the US Head Code and all years of ACI 318. For columns assigned to Intermediate Moment Frames and the shear design/check of seismic combinations, an incorrect value of shear could be used in the calculation of the amplified design shear. This had the potential to produce an unconservative check where the shear produced by seismic loads was critical in the minor direction. Occurrence This issue relates to Tekla Structural Designer 2016 (version 16.0.0.35 released in March 2016) and all subsequent
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin February 2019 (PBTSD-1902-1)

Résumé of issue This issue relates to the analysis and design of meshed concrete walls for all Head Codes. The issue occurred only for the less common case of inclined meshed walls. For these the sign and/or value of 2D Wall Results (Wall Line forces) axial and shear results could be incorrect. Since these results are used in concrete wall design checks, this could produce an unconservative design. Occurrence This issue relates to Tekla Structural Designer 2015 (version 15.0.0.40 released in March 2015) and all subsequent releases.  
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin December 2018 (PBTSD-1812-2)

Résumé of issue Tekla Structural Designer 2018 added a link to Tekla Connecti​on Designer (formerly Fastrak Connections) in order to design base plates and moment connections in models where the Head code was either Eurocodes or British Standards. Connections are designed in accordance with the appropriate Steel Construction Institute Green book, which for base plate connections deals with major axis shear only. Minor axis shear is not considered. Occurrence This issue relates to Tekla Structural Designer 2018 (version 18.0.0.33 released in March 2018) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin December 2018 (PBTSD-1812-1)

Résumé of Issue This issue relates to the design of Isolated Foundations to all Head Codes.  The punching shear perimeters previously determined for column and pile punching checks were not always the shortest possible perimeters when near to the foundation edges.  For column punching, the issue would be more likely to occur for those with larger eccentricities and base/ cap geometries which placed the column closer to the edges/ corners. Occurrence This issue relates to Tekla Structural Designer 2016 (version 16.0.0.35 released in March 2016) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin October 2018 (PBTSD-1810-3)

Résumé of issue This issue relates to the analysis of curved concrete beams with rigid zones (the default) for all Head Codes. The most common symptom was unusually large peak design forces near member ends, which would lead to conservative design.  However there is a possibility the issue could result in an underestimate of design forces within the span. Occurrence This issue relates to Tekla Structural Designer 2015 (version 15.0.0.40 released in March 2015) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin October 2018 (PBTSD-1810-2)

Résumé of issue Under the US headcode (for Customary and Metric Units) for I sections in torsion previous versions of Tekla Sstructural Designer may have evaluated the amplification factor incorrectly. Occurrence This issue relates to Tekla Structural Designer 2017i (version 17.1.0.64 released in September 2017) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin October 2018 (PBTSD-1810-1)

Résumé of issue Under the US headcode (for Customary and Metric Units) for HSS sections in torsion, previous versions of Tekla Structural Designer only took account of Yielding strength when evaluating torsion with combined forces and therefore may have underestimated the utilisation ratio when Local Buckling (or LTB) was more critical than Yielding. Occurrence This issue relates to Tekla Structural Designer 2017i (version 17.1.0.64 released in September 2017) and all subsequent versions.
Requires Tekla Maintenance
by Tekla Structural Designer Global Support
0

Pages