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Product bulletins

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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
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 Development Team
0

Tekla Structural Designer product bulletin September 2018 (PBTSD-1809-2)

Résumé of issue This issue relates to the design of concrete columns for the United States Head Code. For columns with one or more holes in their section, the area of concrete removed by the hole(s) was ignored when calculating the Ultimate Axial Resistance, resulting in an incorrectly higher resistance. Since in ACI 318 the ultimate axial resistance value is capped to reserve moment strength for the code prescribed minimum level of design load eccentricities, there was potential for this to produce an un-conservative design result. Occurrence This issue relates to Tekla Structural Designer
Requires Tekla Maintenance
by Tedds Development Team
0

Tekla Structural Designer product bulletin September 2018 (PBTSD-1809-1)

Résumé of issue This issue relates to the design of spread footings (pad bases) to the USA design code. For some geometries of footing a punching (two-way) shear check is not performed when the critical failure section spans across the footing reaching opposite sides, potentially producing an unconservative design. It is expected this would be critical only in less common situations of heavily loaded footings on very high bearing capacity soil which can result in smaller plan dimension footings subject to relatively high internal design forces. Occurrence This issue relates to Tekla
Requires Tekla Maintenance
by Tekla Structural Designer Development Team
0

Tekla Structural Designer product bulletin August 2018 (PBTSD-1808-2)

Résumé of issue This issue relates to the design of steel beams and columns forming part of a seismic force resisting system (SFRS).  In the following specific circumstances, the required strength value used in the Seismic Strength checks is incorrect producing a potentially unconservative result: Head Code set to United States. Models for which non-linear analysis is required (typically, but not exclusively, those with tension only bracing). Beams and columns in all kinds of SFRS in which they are subject to seismic strength checks. Seismic Wizard Analysis Procedure set to ELF. The Design
Requires Tekla Maintenance
by Tekla Structural Designer Development Team
0

Tekla Structural Designer product bulletin August 2018 (PBTSD-1808-1)

Résumé of Issue This applies to all Head Codes and relates to the checking of parts of a model following an analysis using the Structure Tree context menu check commands, such as ‘Check Plane’ and ‘Check sub structure’ etc.  For these commands no check was performed for steel members in the selected part and their design status was not updated.  It is possible the engineer could miss this and think a design had been performed.  Note that the context menu design options such as ‘Design Plane’ did function correctly. Occurrence This issue relates only to Tekla Structural Designer 2018 Service
Requires Tekla Maintenance
by Tekla Structural Designer Development Team
0

Tekla Structural Designer product bulletin Mar 2018 (PBTSD-1803-2)

Résumé of Issue This issue relates to the properties of plated sections created using US Customary units, hence only the US Head code is likely to be affected.  For US Customary units, some plate dimensions were stored with insufficient precision resulting in a loss of accuracy for plated section properties.  We would note that  in general the issue affected principally analysis, as design for plated sections was not carried out in previous releases for the US Head code.  Additionally, since plated sections and their plates are more commonly large (in which case the lower precision would have
Requires Tekla Maintenance
by Tekla User Assistance Team
0

Tekla Structural Designer product bulletin March 2018 (PBTSD-1803-1)

Résumé of Issue This issue relates to the design of steel braces for the BS Headcode (All Countries).  For braces subject to tension using double-angle sections, the tension capacity check used the gross area Ag of the brace, rather than the net area Ae, potentially producing an unconservative design result. Occurrence This issue relates to  Tekla Structural Designer 2017i (version 17.1.0.64 released in Sept 2017) and subsequent releases.* *The previous Product Bulletin on this topic PBTSD-1801-3 was incorrect in this regard.
Requires Tekla Maintenance
by Tekla User Assistance Team
0

Tekla Structural Designer product bulletin February 2018 (PBTSD-1802-3)

Résumé of issue This issue relates to the design of steel braces for the BS Headcode (All Countries).  For braces subject to tension using flat, double-angle and structural hollow section (SHS, CHS & RHS), the tension capacity check uses the gross area Ag of the brace, rather than the net area Ae , potentially producing an unconservative design result. 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 User Assistance Team
0

Tekla Structural Designer product bulletin February 2018 (PBTSD-1802-2)

Résumé of issue This issue relates to the analysis model for buildings with 2-way concrete slabs supported by beams or walls for all Head Codes.  In specific and relatively rare circumstances the concrete slab 2D element mesh was not correctly connected to a supporting beam or wall.  Resulting errors in design forces would tend to be conservative for slabs but potentially unconservative for supporting beams/walls.  Where this issue occurred it would generally be clearly apparent from deflections and unexpected failure of slab design due to it spanning a greater distance. Occurrence This issue
Requires Tekla Maintenance
by Tekla User Assistance Team
0

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