4-5.2.2010 METNET Gottbus 1
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Joint design using component method in 3D, ambient and fire
Markku Heinisuo, Professor of Metal Structures
4-5.2.2010 METNET Gottbus 2
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Joint design using component method in 3D, ambient and fire
On-going research in Research Centre of Metal Structures2 PhD thesis under preparation (est 2010-2011)
Motivation:All structures behave more or less in 3DDesign of members between joints in 3D is a routine task in the design processWe know about nothing of the behavior of joints in 3D ! In EN standards: nothing !Behavior: stiffness, resistance and ductilityTo perform reliable structural steel design the behavior of joints should be knownBoth in ambient and fire conditions (impact, blast, earthquake as well =>
robustness requirements)
⇒ Designers are forced to make conservative assumptions of the joint behavior
⇒ Potential to enchance cost effectivity and safety of steel structures !
4-5.2.2010 METNET Gottbus 3
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Our solution: Enlargement of the well-known component method into 3D• Heinisuo M., Laine V., Lehtimäki E., Enlargement of the component method into 3D.
Proceedings of Nordic Steel Construction Conference, Luleå Unversity of Technology, SBI, Publication 181, Malmö, Sweden, September 2-4, 2009, pp. 430-437
Integration to product modeling, bolded new actions produced by us:
⇒ Stiffness of joints automatically, without no extra work by the desiger, to the global analysis model. Joint resistance checks integrated too.
• Heinisuo M., Laasonen M., Anttila T., Integration of joint design of steel structures using product model. Sent to: ibbbce2010, Nottingham, UK.
Product model(Tekla Structures)
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Entities
•Members
•Joints (macro including component model)
•Loads
Joint resistances (macro)
Analysis model(Autodesk Robot)
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3D FEM, Bernoulli-Euler beam elements
•Members: OK
•Joints: OK (stiffness, eccentricities)
•Loads: OK
Run analysis
Member resistances
Model
Model with updated members
Stress resultants
4-5.2.2010 METNET Gottbus 4
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
To do that:
Verified models for entire joints are needed.
Verification:Tests, badly needed, METNET co-operation? Tests required in EN standards.FEM simulations, everybody can do this (?)
Our strategy so far:Try to manage using components available in the literature as much as possible.Basically component behavior is in 3D already for many components!Develop new components only if really needed (so far compression components).Verification of FEM models: Against tests for planar cases (benchmarking).Use carefully the same FEM model for 3D cases (case study).Some tests will be completed during spring 2010 in TUT.
Same idea proposed for other materials in a national RYM SHOK project.
Local joint model in Robot
4-5.2.2010 METNET Gottbus 5
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
What is component method, history ?
Developed in Austria, USA and Holland during 1980’sTSCHEMMERNEGG, F., TAUTSCHNIG, A., KLEIN, H., BRAUN, Ch. and HUMER, Ch., 1987. Zur
Nachgiebigkeit von Rahmen-knoten – Teil 1, Stahlbau 5, Heft 10: pp. 299-306.
Enlarged into fire cases in UK and Portugal during 1990’sLESTON-JONES, L., 1997. The influence of semi-rigid connections on the performance of steel
framed struc-tures in fire, PhD Thesis, University of Sheffield.
Accepted to the European standard in 2005 (2D cases)EN 1993-1-8, 2005. Eurocode 3: Design of steel structures, Part 1-8: Design of joints, CEN,
Brussels.
Enlarged into 3D in Malmö 2009 by us.
4-5.2.2010 METNET Gottbus 6
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
What is component method, theory ?
The joint is splitted into components which behaviors are known.Components: bolts, welds, end plate bending, web tension, etc (see EN 1993-1-8) The behavior (springs) can be elastic, elastic-plasic or elastic-plastic-ultimate.Using rigid links the springs are composed at the point where the member model is
connected to the local joint model.=> Global analysis model is ready.
Elastic-plastic-ultimate
4-5.2.2010 METNET Gottbus 7
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Where is the local joint model locating ?
EN 1993-1-8: DEL SAVIO, A. A., et al, 2009:
(mid line of end plate)
Our studies:
(end section of the member)
4-5.2.2010 METNET Gottbus 8
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Why there ?
We want to fix the local joint displacements u(s) to the member axis displacements:
To do that we minimise
We end up
These are used when comparing FEM results for component method results, too.
4-5.2.2010 METNET Gottbus 9
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Example, base bolt joint, Henri Perttola, PhD candidate, component results underpreparation
Strong axis bending, tests available New cases, weak axis bending and bimoment(Polish, Belgium research)
M-kiertymä-kuvaaja: HEA200, puhdas taivutus
0
5
10
15
20
25
30
35
40
0 10 20 30 40 50 60 70 80 90 100
kiertymä [mrad]
M
[kN
m]
FEM, pilariS235, pultit 4.6
Koe,Guerlement
FEM, pilariS235, pultit 4.6,kiertymätähtissuureenaFEM, pilari 235,pultit 8.8
Test and FEM comparison
4-5.2.2010 METNET Gottbus 10
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Example, beam to column joint, PhD candidate Hilkka Ronni, component resultsunder preparation
Strong axis bending, tests available New cases, strong (neg),weak axis bendingFire tests in Machester, UK, Wang
4-5.2.2010 METNET Gottbus 11
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
Tests, to be completed in spring 2010 in TUT14 steel: loaded joints in ambient temperature6 aluminium: loaded joints in ambient temperatures2 steel: loaded joints in fire conditions (furnace of TUT)
4-5.2.2010 METNET Gottbus 12
Faculty of built environment, Department of structural engineering
Research Centre of Metal Structures, Seinäjoki, Hämeenlinna
More information
Perhaps in Istanbul 21-23 September 2010. Steel structures: Culture & Sustainability
Perhaps in Wroclaw 15-17 June 2011. XII International Conference on MetalStructures
Perhaps in future METNET meetings
In the referred theses when completed
Hopefully soon in macros for designers
Thank you
