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Timisoara
2017
Experimental Investigations on Spot Welded Built-Up Cold-
Formed Steel Beams
UNGUREANU Viorel, BOTH Ioan, BURCA Mircea, BENZAR Ştefan, NGUYEN Thai Hoang,
NEAGU Calin, DUBINA Dan
The 12th International conference “Structural Integrity of Welded Structures
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Context
• Built-up light-weight structural elementswith material and workmanship savings.
• To present new research developments oncold-formed steel beams of corrugatedweb (CWB)
Objective
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CORRUGATED WEB BEAMS – classical solution
Zeman & Co (http://www.zeman-stahl.com/)
• Thick flanges – Thin web• Automatic welding
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Exemplification by Zeman & Co (http://www.zeman-stahl.com/)
CORRUGATED WEB BEAMS – classical solution
Not limited to classical single story industrial buildings
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The main benefits:•the corrugated webs increase the beam’s stability againstbuckling (buckling resistance of commonly used sinusoidalcorrugated sheeting is comparable with 12 mm flat webs);
•the use of thinner webs results in lower material cost (anestimated cost savings of 10-30% in comparison with conventionalfabricated sections and more than 30% compared with standardhot-rolled beams);
CORRUGATED WEB BEAMS – classical solution
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ALTERNATIVE SOUTION
- is 100% composed of cold-formed steel elements, avoiding the
combination of two types of products;
- high protection to corrosion due to the fact that all components are
galvanized;
- to develop a structural system able for easy and/or automated
prefabrication, reduced erection time, mass production and possibility
of high-precision quality control.
- Corrugated web beams with entirely made of cold-formed parts
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EXPERIMENTAL PROGRAMCEMSIG Research Centre of PU Timisoara
o flanges: – 2xC120/2.0o corrugated web: -A45/0.7o supplementary shear panels of 1mm thicknesso self-drilling screws for flange-to-web
connections – 6.3x25o self-drilling screws as seam fasteners – 4.8 x20o M12 class 8.8 bolts for end connections of
back-to-back lipped channels to the supports
Actual solution : SCREWED !
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0
50
100
150
200
250
0 20 40 60 80 100 120 140 160
Forc
e [
kN]
Displacement [mm]
CWB - 1
CWB - 2
CWB - 3
CWB - 4
CWB - 5
Design level
SLEN
SL
S
ULS
Beams CWB 1…5
EXPERIMENTAL PROGRAM
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o SHELL Element – S4R type• 4 nodes, reduced integration
o CONECTOR Element – CONN3D2 type• for self-drilling screws and bolts• 2 nodes, 6 DOF per node• Non-linear deformation according to
imposed load
Numerical model calibration and validation
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PN-III-P2-2.1-PED-2016-1684
Fast welding cold-formed steel beams of corrugated sheet web
WELLFORMED
The main objectives of the project:•to validate a new technological solution, CWB where the connectionsmade of intermittent SW and MIG/MAG W;
•to validate it by a parametric study via numerical models usingABAQUS FEM tool;
•to adapt/extend the rules of the EN 1993-1-5, Annex D to this newtype of beams;
•to develop a structural system able to satisfy easy prefabrication,automation and mass production.
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SPOT WELDING
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The 12th International conference “Structural Integrity of Welded Structures
SPOT WELDING
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SPOT WELDING – preliminary investigations
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SPOT WELDING – preliminary investigations
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SPOT WELDING – preliminary investigations
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RESULTS
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Interfacial failurethick sheets
Nugget pulloutthin sheets
FAILURE MODES
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MIG/MAG welding equipment impulse welding
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MIG/MAG welding equipment impulse welding -preliminary investigations
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MIG/MAG welding equipment impulse welding -preliminary investigations
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FAILURE MODES
Near weld material fracture (HAZ)
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670 specimens for welded connections (SW and CMT)95 specimens for tensile tests
Tests of welded connections and optimisation of fastening technology
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Further study: Tests on full scale CWB beams
4 full scale beam specimens two using SW and two using CMT
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CONCLUSIONSA new experimental program on connecting details (using
SW and MIG/MAG W) and full-scale beams has started at the PUTimisoara, on the purpose to demonstrate and evaluate theperformances of proposed solutions;
The experiments shown:-both the capacity and the ductility obtained for the testedspecimens are very good;-compare to similar specimens tested in [5] using self-drillingscrews, the capacity of the tested specimens is double but theductility is decreased;-relevant tested specimens developed full button pull-out failure.
The results are encouraging and prove the potential of thissolution to standardized beams and industrialized fabrication.
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Thank you for your attention!
ACKNOWLEDGEMENT
This work was supported by the grant no. 57PED/2017,WELLFORMED - Fast welding cold-formed steel beams ofcorrugated sheet web, Project type PN-III-P2-2.1-PED-2016,financed by the Executive Agency for Higher Education, Research,Development and Innovation Funding (UEFISCDI), Romania.
Ioan [email protected]
The 12th International conference “Structural Integrity of Welded Structures