Support articles

Guide to resolving Mechanisms

Mechanisms are stability problems in the model which must be addressed and we advise should not be ignored.  More information related to mechanisms can be found in the related (N-1) rule article. The N-1 rule must be followed when modelling to avoid these warnings. Mechanisms can be classed into two main types: Local - a node that is free to spin in one or more DOF's, or a member that is free to spin about its longitudinal axis.  DOF = Degree of freedom, i.e. a direction of translation or rotation.  In a 3D model there are 6 DOF's at every node; X,Y and Z translation and X,Y and Z rotation.
Requires Tekla Maintenance
by Trimble Solutions UK
4.5
  • N-1
  • N1
  • Mechanisms

"Error 7: The storage control blocks were destroyed." upon install Structural Designer AIR Help

Although the above error is a generic one if the AIR Help fails to install, there are a set of circumstances where this is known to happen Issue Due to an issue with the signing of the installation package, this error can also occur in the following circumstance The install was the first release of 2017i (Tekla Structural Designer 2017i software release (17.1.0.64)) The install is performed after the 12th Jan 2018 The Tekla Structural Designer 2017i Help has NOT previously been installed successfully (prior to 12th Jan 2018) Further information If you try to run the AirHelp installer direct
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by Tekla Structural Designer Global Support
0
  • Adobe
  • AIR Help
  • storage
  • control
  • blocks
  • destroyed
  • installer
  • damaged

When using the gap function for wind panels, the loading applied does not appear to change?

Question When using the gap function for wind panels, the loading applied does not appear to change. I was led to believe the wall property 'gap' function was how we considered funnelling. Is this correct and if not, how would we look at loads due to funnelling?      Answer You need to make reference to BS6399-Part 2-1988 and Clause 2.4.1.4   The Clause is best described by way of a worked example. We will assume building dimensions of 24m width x 24m depth x 84m high Funnelling effects the side elevations of a building where the wind flow is accelerated and hence increases the negative wind
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by Tekla Structural Designer Development Team
0
  • Funnelling
  • Gap
  • wind

How do I obtain the information reported in Check or Design Member within a report?

Question How do I obtain the information reported in Check or Design Member within a report, as it appears to contain less detailed information. We are unable to provide a report to checking engineers without requiring a screencapture of the Check or Design Member dialog or for them to have access to Tekla Structural Designer to review the dialog themselves. Can the detailed information be provided in a report?    Answer Reports are customisable and allow you to set a level from Critical (minimum detail) through to 9 (maximum detail). The value of the report level used when setting up the
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by Tekla Structural Designer Development Team
0
  • report
  • level
  • Content
  • report content

Truss modelling, axial force and the effect of Diaphragms

If you model a truss within Tekla Structural Designer, you would perhaps expect it to take axial compression or tension in the top or bottom chords. The magnitude being dependant upon the load and direction. This axial force expectation is clearly shown in the screenshot below where no diaphragm is defined at the level of the truss chords, when the truss is subject to gravity loads.   What effect do we think applying a diaphragm to the chord level will make to our modelling? Before answering the above question it is important to understand what a diaphragm is. Tekla Structural Designer allows
Requires Tekla Maintenance
by Tekla Structural Designer Development Team
5
  • diaphragm
  • Truss
  • Axial Force

Tekla Structural Designer 2017i Service Pack 3

This release will upgrade your installation to Tekla Structural Designer 2017i Service Pack 3 version number 17.1.3.84 and should be installed to ensure optimum function of the program.   It includes a number of enhancements and issue resolutions as detailed below. If you are upgrading from a version earlier than the most recent Tekla Structural Designer 2017i Service Pack 2a (version 17.1.2.75) you can find details of enhancements and fixes included in all previous releases in Tekla User Assistance (TUA) and Tekla Download.  You will find all the main releases listed in the Knowledge base
by Tekla Structural Designer Development Team
4

Tekla Structural Designer product bulletin November 2017 (PBTSD-1711-1)

Résumé of issue This issue relates to the d​esign of steel Gable Posts to the Headcodes; Eurocode (all countries), BS (all countries). For the Eurocode, when subject to axial load and bending, the combined buckling check is not carried out. For the BS code, whilst combined buckling checks are carried out, they reference the incorrect flange and separate LTB checks are not undertaken. Both issues could lead to an unconservative result. However we would note that, in the most common application of Gable Posts, bending moment tends to dominate design and axial load is likely to be relatively
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by Tekla Structural Designer Global Support
0

Intermediate lateral torsional buckling restraints on columns designed to EC3

For column design using the Eurocode, the LTB design length is assumed to be between those positions where the column is restrained in both the major and minor compression buckling  directions and at flanges A and C. This assumes the ‘standard conditions of end restraint’ and thus an effective length factor less than 1.0 would be inappropriate. Further, since flanges A and C can be given an effective length, the worst of LeA, LeC and the system length should be adopted for the LTB design length. This is because the interaction equations given in the Eurocode only cover design between points
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by Tekla Structural Designer Global Support
3.666665

Westok beam subject to loads which cause hogging moments along the beam are currently beyond scope

Question: Is it possible to design Westok beams as rafters in a roof system? I tried but the wind uplift always results in hogging / load reversal and I obtain the following Beyond Scope message. Is there another way to deal with it?       Answer: Currently Westok beam design within Tekla Structural Designer can only handle gravity loading. i.e. if the beam exhibits hogging, then it is beyond the scope. For these beams, you can go to the Home tab > BIM Integration group > Cellbeam Export command to export the beam to Westok Cellbeam to undertake the design in this separate
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by Trimble Solutions UK
0
  • Beyond Scope
  • westok beam
  • Cellbeam
  • Hogging

How to transfer custom material databases between computers?

Question: I needed a section and material that is not in the Tekla Structural Designer database so I created my own material database item. However these new items are needed across all models within my company, how can we include these custom items in all databases without having to create them from scratch on all machines? Answer: The solution to this problem is simple and requires only a one time creation and modelling of the items in Tekla Structural Designer. One person creates the custom items within a model (preferably a new model for this purpose) Create different members with
Requires Tekla Maintenance
by Trimble Solutions UK
5
  • Custom section
  • custom material
  • template
  • new

Effect of diaphragm stiffness

Question: What is the appropriate stiffness for a semi rigid diaphragm? Answer: Semi-rigid diaphragms have an additional option which allows us to determine how stiff we wish the diaphragm to be during the analysis. For this example, the stiffness of the diaphragm has been set at 1000th of initial stiffness. The stiffness of the diaphragm that is used should be determined by the engineer but here we will consider a number of options to see what effect this will have. Example Once a slab has had its properties set to Semi-rigid, you can adjust the Divide stiffness by property to adjust its
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by Trimble Solutions UK
5
  • semi rigid diaphragm
  • stiffness
  • divide stiffness by
  • diaphragm

How do I use the Lateral and Strut restraints options?

Question: How do I use the Lateral and Strut restraints options? Answer: The Lateral restraints and Strut restraints options are found in the member Properties.  This dialog can be opened by right-clicking on a member and choosing the Edit option, or by double-clicking on a member. The values entered alter the effective length values used in the buckling and other checks during the design process. But what do they relate to and what happens if they're edited? The dialog The below images show the default Lateral and Strut Restraint property pages.  If you wish for a floor or member not to
Requires Tekla Maintenance
by Trimble Solutions UK
1
  • lateral restraints
  • strut restraints
  • restraint
  • properties
  • effective length

Designing beams in braced bays for axial load

Question: How do I design a beam for axial load if it is part of a diaphragm? Answer: In a steel model in Tekla Structural Designer the lateral loading in the structure would be expected to be taken by the diaphragm. This would then transfer the loading to the bracing or shear walls in the model, depending on the stability system being used. If the diaphragm is set up to be rigid, all of the loading in the diaphragm will be transferred to the bracing system, and the beam connecting to the columns will show as not having any axial load present. This is because all nodes within a diaphragm
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by Trimble Solutions UK
0
  • axial load
  • diaphragm
  • rigid
  • semi-rigid
  • semi
  • floor

How do I control the content of the member report drawing?

Question: How do I control the content of the member report drawing? Answer: You can control the content of drawings within Tekla Structural Designer via the Draw ribbon (1) > Edit... command (2). For member drawings you need to review the Member Details (3) sub-pages under Layer Configurations or Layer Styles and select the appropriate Drawing Variant (4) i.e. Non-concrete Column Detail. You can then turn On/Off items as necessary (5). Layer Configurations control the content of the drawings where as the Layer Styles control how that content is displayed. Note, that you can create
Requires Tekla Maintenance
by Trimble Solutions UK
0
  • drawings
  • report drawings
  • layer configurations
  • drawing content

Tekla Structural Designer 2017i Service Pack 2a

Important This Service Pack is a replacement to Service Pack 2 therefore if you are not already aware of the content of Service Pack 2 please read the Service Pack 2 Release notes This release will upgrade your installation to Tekla Structural Designer 2017i SP2a version number 17.1.2.75 and should be installed to ensure optimum function of the program.   It includes a number of enhancements and issue resolutions as detailed below. If you are upgrading from a version earlier than the most recent Tekla Structural Designer 2017i SP2 (version 17.1.2.74) you can find details of enhancements and
by Tekla Structural Designer Development Team
0

Tekla Structural Designer product bulletin October 2017 (PBTSD-1710-2)

Résumé of Issue This issue relates to Composite Beam Design for All Head Codes.  For beams with the option “allow non-composite design” checked on and when designed as non-composite (due to composite design failure), the composite inertia was still used for deflection calculation resulting in an underestimate of deflections. Occurrence This issue relates to all versions since Tekla Structural Designer 2015 (version 15.0.0.40) released in March 2015.
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by Tekla Structural Designer Global Support
0

Tekla Structural Designer product bulletin October 2017 (PBTSD-1710-1)

Résumé of issue This issue relates to the design of flanged concrete beams (“T-beams”) to the US Head Code (ACI). In the following circumstances the calculated deflection was underestimated potentially resulting in a pass status rather than a failure: Options “Consider flanges” and “Include flanges in analysis” both enabled. Section 8.12 produced a smaller flange width for design than that used in analysis, or resulted in the flange being ignored for design. Occurrence This issue relates to all versions since Tekla Structural Designer 2015 (version 15.0.0.40) released in March 2015. 
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by Tekla Structural Designer Global Support
0

Tekla Structural Designer 2017i Service Pack 2

Note This Service Pack has been replaced by Service Pack 2a - please read both the content below and the Service Pack 2a Release notes This release will upgrade your installation to Tekla Structural Designer 2017i SP2 version number 17.1.2.74 and should be installed to ensure optimum function of the program.   It includes a number of enhancements and issue resolutions as detailed below. If you are upgrading from a version earlier than the most recent Tekla Structural Designer 2017i SP1 (version 17.1.1.67) you can find details of enhancements and fixes included in all previous releases in
by Tekla Structural Designer Development Team
5

How can I centrally deploy Tekla software?

I want to centrally deploy Tekla Structural Designer what do I need to do to be able to do this? Tekla installations are designed to support distributed deployment scenarios using Windows Group Policy or proprietary Software Management Systems (SMS). The SMS software will vary depending upon your chosen deployment process and therefore we are unable to offer detailed technical assistance on how to impliment this. What we can provide is a list of requirements / components and how to install them to allow you to package up a centralized install in your chosen deployment process. Where is the
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by Tekla User Assistance Team
0

Comparisons of Slab Deflection Checking Methods

There is a belief among some proportion of practicing engineers that traditional methods of sizing slabs based on span/effective depth methods are conservative and therefore that a more detailed deflection estimate involving assessment of creep/cracking/shrinkage will allow thinner slabs to be proved as adequate. Below, comparisons are made for a very simple example (using BS8110 and EC2 design codes). It demonstrates that this expectation is not fulfilled and that the rigorous methods could be quite wasteful if applied un-necessarily. It demonstrates that the use of linear FE analysis along
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by Tekla Structural Designer Development Team
5
  • Slab Deflection
  • slab depth
  • deflection

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