Connection extensions in SCIA Engineer v15.2 and v15.3
New in 15.2
SCIA Engineer v15.2 brings out a number of small improvements in the modules for EUROCODE steel connection design. These improvements relate to the visualisation of the connection and to the architecture, usability, and speed of the verifications.
- An a reworked summary output is now provided alongside the brief and detailed reports. It gives an overview of the internal forces in the node and the most important parameters of the verification: obtained resistances, stiffness, unity check values and stiffness diagrams. This report style is available for all moment-stiff, pinned, and grid-pinned connections.
- An new enhanced output for splice connections includes more details on the bolt-row classification, effective length of yielding patters, resistance calculations and critical components in the connection. The speed of connection check has increased.
- An improvement of the internal architecture results in speed gains.
- Previously encountered issues in the visualisation of connections between members with a rotated local coordinate system have been cleared out.
Beam flange and web in compression
Calculations related to the component "Beam flange and web in compression" have been made faster and the output clearer. In the process of refactoring the source code of the connection modules, open-standing issues were solved, the report was extended with information about intermediate calculation steps and, in overall, the architecture has been improved.
In addition, article 188.8.131.52 (1-2) of EN 1993-1-8 is now supported: for beam heights which exceed 600 mm (including haunches), the contribution of the beam web to the design compression resistance is limited to 20%.
New in 15.3
SCIA Engineer v15.3 features a newly implemented method for the design of moment connections with four bolts per row. The method allows the designer to calculate such connections accurately and economically; it is derived from the most recent scientific publications on the topic and fully complies with EN 1993-1-8.
Connections with 4 bolts per row
Moment-stiff end-plate connection with four bolts per row are now better understood after a dedicated scientific effort in the recent years that includes analytical and numerical studies and full-scale experiments. In order to offer a safe verification technique for such connections, SCIA has synthesised the findings of the following publications:
- Application of Eurocode 3 to steel connections with four bolts per horizontal row. J.-F. Demonceau, K. Weynand, J.-P. Jaspart, and C. Müller (2010);
- Zum Tragverhalten von geschraubten momententragfähigen Stirnplattenverbindungen mit 4 Schrauben in jeder Schraubenreihe. B. Schmidt (2008);
- Design of Structural Connections to Eurocode 3 – Frequently Asked Questions (6Q&A5 Yield line Patterns for Row with 4 Bolts). D.B. Moore and F. Wald (2003);
- Entwicklung eines Bemessungsprogramms fuer geschraubte Traeger-Stuetzen-Verbindungen nach ONORM EN 1993-1-8 mit Erweiterung auf 4 Schrauben je Reihe. R. Lang (2006);
- Momententragfähige Verbindungen nach DIN EN 1993-1-8 (EC3-1-8). D. Ungermann and S. Schneider (slides) (2014).
- Connections with four bolts per row per horizontal row. Application of Eurocode 3. J.-F. Demonceau, J.-P. Jaspart, K. Weynand, R. Oerder , and C. Müller (2011).
The provided connection check is based on the component method and therefore remains in full agreement with EN 1993-1-8. The following extensions of the basic component method are made in order to apply it to connections with four bolts per row:
- modifications in the effective lengths of T-stubs for both circular and non-circular yielding patterns: the presence of four bolts per row instead of two influences the development of plastic yield lines within the components loaded in bending;
- modifications of the resistance formulas for the T-studs: these are adapted in the case of failure modes 2 and 3.
- Adapting the effective lengths results in updated values for both the resistance and the stiffness of the connection components in bending.
In the verification for shear forces, only bolts actually used in tension have their resistance reduced according to the 28% rule.
- According to the theory, only bolt-rows located adjacent to a stiffener can utilise the tensile resistance of all four bolts in the row.
- This means that some bolt-rows will only contribute to the moment resistance through the tensile strength of only two of the four bolts. In this case, the other two bolts will be considered capable to carry shear to full capacity.
This new development aims to broaden the scope of SCIA Engineer's connection design modules and allow the user to automate the verification of previously less usual connection geometries.
Drawing of welds has been improved both in the 3D graphical window of SCIA Engineer and the connection monodrawings.