Product bulletins

Tekla Structural Designer product bulletin January 2017 (PBTSD-1701-02)

Résumé of Issue This issue relates to models in which bearing walls intersected with concrete walls of both FE mesh and mid pier types. In this case vertical bearing wall elements were created within the elements of the concrete wall at the intersection. This would both increase the wall stiffness and reduce the forces within the wall elements. This could lead to concrete walls being designed for lesser load than might be expected and building sway resistance being stiffer than expected. Where the issue occurred it would generally be evident by unusually high reactions at the intersection
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin January 2017 (PBTSD-1701-01)

Résumé of Issue Where concrete wall releases “Continuous (incoming members pinned)” were set for both wall panel ends above/below a level, Notional loads* were not applied to the wall mesh nodes at that level. Depending on the number of walls in a model and the extent of application of the release, this could result in a significant reduction in the loads that should be considered. In most circumstances it is expected that the issue would be clearly apparent from a review of the applied Notional loads (Results Ribbon > NHF/EHF/NL button for a selected combination including Notional Loads
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin November 2016 (PBTSD-1611-01)

Résumé of Issue In some circumstances the flat slab Punching Checks could use an incorrect and too high tension reinforcement ratio ⍴ for both directions.   This could produce an unconservative result for the slab shear capacity without reinforcement.  The issue occurred in the following specific circumstances (which are considered to be unlikely but not impossible): Head Code set to BS or Eurocode (all Countries/ Regions) Checks within Column patches for which the patch reinforcement was set = None and reinforcement was only placed in the slab panel. Occurrence This issue relates to
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin October 2016 (PBTSD-1610-1)

Résumé of Issue In some circumstances the flat slab Punching Checks could use an incorrect and too high tension reinforcement ratio ⍴ for one direction. This could produce an unconservative result for the slab shear capacity without reinforcement. The issue only occurred in the following specific circumstances:  It is believed the occurrence of the issue is likely to be rare. It could occur only in the following circumstances:  Head Code set to BS or Eurocode (all Countries/ Regions). Slabs with either no reinforcement or mesh (fabric) reinforcement in the tension surface at the check
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by Tekla Structural Designer Development Team
0

Tekla Structural Designer product bulletin September 2016 (PBTSD-1609-2)

Résumé of Issue For the Head code United States (ACI/AISC) and design of flanged concrete beams (commonly termed “T-beams” and “L-beams”) there was potential for an underestimate of the design deflection and hence an unconservative result for the deflection check.  It is believed the occurrence of the issue is likely to be rare. It could occur only in the following circumstances:  Both the following concrete beam properties were set to on: Design Control > “Consider flanges”, and “Include flanges in analysis”.  The thickness of the beam flange was such that, to ACI cl 8.12, it was
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin July 2016 (PBTSD-1607-01)

Résumé of Issue In some circumstances FE Concrete Walls in sub models are not assigned the correct vertical base supports. This can produce mechanisms in sub models in the Chasedown analyses and incorrect analysis results. TSD includes many built in automatic cross checks where errors and warnings get triggered if problems are detected. Hence in most circumstances these will prompt the engineer to investigate the issue and take action. However there is a potential that in some models the issue may be less obvious and thus missed by the engineer. Occurrence This issue relates only to TSD 2016
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin May 2016 (PBTSD-1605-1)

Résumé of Issue In certain circumstances the Wind Wizard calculated design wind speeds Ve and the wind pressures q can be significantly underestimated. This can produce wind loads which are un-conservatively low for some or all wind directions. This occurs only for the following settings and circumstances; Wind Loading set to BS 6399-2 1997 Wind Wizard Method set to Hybrid option The default Standard Method is not affected Locations for which wind directions are fully in town and on the edge of town The effect is greater for low rise buildings and those further within town Occurrence This
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin April 2016 (PBTSD-1604-1)

Résumé of Issue Affects the following types of Panel loads; Point, Line, Patch, Variable Patch There is potential for some panel loads to be removed in the following scenarios. No warning is issued in this circumstance so the engineer could miss the fact that the load has been removed. When opening a model produced in TSD v2015i or earlier in TSD 2016. Loads added in TSD 2016 when the model is saved, closed and reopened. Occurrence This issue relates to the first release of TSD 2016 version 16.0.0.35.
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin July 2015 (PBTSD-1507-01)

Résumé of Issue There is an unconservative error affecting Temperature Loads when input in degrees Fahrenheit (°F) Occurrence This issue relates to all releases of Tekla Structural Designer 2015 (and all previous releases of Solve) where temperature loads have been applied to models input in US Customary Units.
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin September 2016 (PBTSD-1609-1)

Résumé of Issue There is a potentially unconservative error affecting the automatically calculated loads produced by the Wind Wizard for the Eurocode. This only occurs for the following circumstances:  Head code is set to the United Kingdom (Eurocode) or Ireland (Eurocode) The Wind Loadcases option “Structural Factor - Automatically calculate separate cs and cd factors” is set to On A value of structural damping δs is entered that requires interpolation across two charts in fig. NA.9 (the default value of δs = 0.05 is not affected) Occurrence This issue relates to all versions to date since
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by Tekla Structural Designer Development Team
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Tekla Structural Designer product bulletin July 2016 (PBTSD-1607-02)

Résumé of Issue The issue affects punching shear checks for the Head code EC EN 1992-1-1:2004. Where both transfer moment and shear exist, and the shear value is negative (for example where a column is supported on a transfer slab), a value of magnification factor β < 1.0 can be calculated which can produce an incorrect and un-conservative result for the check. Occurrence This issue relates to all releases of TSD up to and including TSD 2016 Service Pack 1 (version 16.0.1.45).
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by Tekla Structural Designer Development Team
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