Experimental Investigations on Spot Welded Built-Up Cold-Formed Steel Beams

2018 ◽  
Vol 1146 ◽  
pp. 142-151
Author(s):  
Viorel Ungureanu ◽  
Ioan Both ◽  
Mircea Burca ◽  
Ştefan Benzar ◽  
Thai Hoang Nguyen ◽  
...  
Keyword(s):  
Spot Welding ◽  
Steel Sheet ◽  
Experimental Program ◽  
Experimental Investigations ◽  
Steel Beams ◽  
Technological Solution ◽  
Research Project ◽  
Steel Sheets ◽  
Cold Formed Steel ◽  
Thin Walled

Within the WELLFORMED research project, ongoing at the CEMSIG Research Center of the Politehnica University of Timisoara, a new technological solution was proposed for built-up beams made of corrugated steel sheets for the web and thin-walled cold-formed steel profiles for the flanges, connected by spot welding. The research project integrates an extensive experimental program on such beams, using full scale specimens, to demonstrate the feasibility of the proposed solutions and to assess their performance, followed by numerical simulations to characterize and optimize the connecting details. The present paper presents the results of a large experimental program, on small specimens subjected to shear, consisting of two or three layers of steel sheet connected by spot welding.

Numerical investigation of built-up cold-formed steel beams connected by spot welding

2019 ◽  
Author(s):  
Viorel Ungureanu ◽  
Ivan Lukačević ◽  
Ioan Both ◽  
Mircea Burca
Keyword(s):  
Spot Welding ◽  
Welding Process ◽  
Experimental Program ◽  
Steel Beams ◽  
Research Project ◽  
Steel Sheets ◽  
Corrugated Web ◽  
Cold Formed Steel ◽  
The Stability ◽  
Shear Panel

<p>Built-up cold-formed steel elements are efficient structural elements, very attractive due to material savings, but also for ease of construction. The connection between the built-up beam components can be easily obtained by screws, but the developments in the welding process also led to other solutions like spot welding. The WELLFORMED research project, conducted within the CEMSIG Research Center of the Politehnica University of Timisoara, proposes to study a new technological solution for built-up beams made of corrugated steel sheets for the web and thin-walled cold-formed steel profiles for the flanges, connected by spot welding. Within the research project, the experimental work included tensile-shear tests on the lap joint welded specimens, where different combinations of steel sheets with various thicknesses were tested and, tests on two full-scale beams in bending. The paper briefly summarizes the results of the experimental program and extends the research by numerical analyses to demonstrate the potential of this solution for standardization and industrial manufacturing. Based on the validation of the numerical model, the paper presents the influence of several parameters i.e.: (1) the initial imperfections, (2) the number and distance between spot welding on flanges, (3) the thickness of the flanges, (4) the thickness of the corrugated web and (5) the thickness of the shear panel. From the parametric study, it results that the bearing capacity of the corrugated web beams made of cold-formed steel components is highly affected by the stability of the components and less affected by the configuration and the number of spot welding.</p>

scholarly journals Experimental investigations on built-up cold-formed steel beams connected by resistance spot welding

2018 ◽  
Author(s):  
Viorel Ungureanu ◽  
Ioan Both ◽  
Mircea Burca ◽  
Marius Grosan ◽  
Calin Neagu ◽  
...  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Experimental Investigations ◽  
Steel Beams ◽  
Lap Joint ◽  
Shear Tests ◽  
Research Project ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Cold Formed Steel

The WELLFORMED research project, ongoing at the CEMSIG Research Center of the Politehnica University of Timisoara, proposes to study a new technological solution for built-up beams made of corrugated steel sheets for the web and thin-walled cold-formed steel profiles for the flanges, connected by resistance spot welding. Within the research project, the experimental work includes tensile-shear tests on the lap joint spot-welded specimens, were different combinations of steel sheets with various thicknesses were tested and, tests on full scale beams in bending. The study intends to demonstrate the feasibility of the proposed solutions, to assess their performance and to enlarge the knowledge by using numerical simulations for the optimization of the current solution and to define the limits of the solution’s applicability.

Experimental Investigations on Capabilities of Resistance Spot Welding and MIG Brazing for Producing Corrugated Beams Using Galvanized Steel Sheets

2021 ◽  
Vol 1164 ◽  
pp. 47-54
Author(s):  
Bogdan Radu ◽  
Viorel Ungureanu ◽  
Ioan Both ◽  
Mircea Burcă ◽  
Ştefan Benzar ◽  
...  
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Materials Science ◽  
Research Work ◽  
Steel Structures ◽  
Galvanized Steel ◽  
Experimental Investigations ◽  
Steel Beams ◽  
Resistance Spot ◽  
Steel Sheets

This paper summarized the research work carried out by a team from Department of Steel Structures and Structural Mechanics, together with Department of Materials Science and Engineering, from University Politehnica Timisoara, which tried to determine the possibility to use welding for obtaining built-up cold-formed steel beams made of corrugated galvanized steel sheets (grade S350GD+Z). There were analyzed two joining processes: MIG brazing and Resistance Spot Welding with the aim to replace the self-drilling screws used until now. The results are very promising and these solutions of joining have beside economic advantages also technical and quality ones.

Built-Up Cold-Formed Steel Beams with Corrugated Webs Connected with Spot Welding

2015 ◽  
Vol 1111 ◽  
pp. 157-162 ◽  
Author(s):  
Ştefan Benzar ◽  
Viorel Ungureanu ◽  
Dan Dubină ◽  
Mircea Burcă
Keyword(s):  
Spot Welding ◽  
Local Buckling ◽  
Steel Beams ◽  
Steel Buildings ◽  
Moment Capacity ◽  
Steel Sheets ◽  
Beam Depth ◽  
Steel Sections ◽  
Cold Formed Steel ◽  
The Web

Corrugated web girders emerged in the past two decades. Their main advantages consists in the possibility to use slender webs avoiding the risk of premature local buckling. Consequently, higher moment capacity might be obtained increasing the beam depth with really thin webs, which are stiffened by the corrugations. Increased interest for this solution was observed for the main frames of single-storey steel buildings and steel bridges. A new solution was proposed at the Politehnica University of Timisoara, in which the beam is composed by a web of trapezoidal steel sheet and flanges of back-to-back lipped channel steel sections. This solution uses self-drilling screws for connecting flanges to the web and to ensure the continuity of the web as seam fasteners. Starting from this new technological solution the paper extends and investigates the use of spot welding as seam fastening to build the web, in order to increase the degree of automation of fabrication. Experimental work of specimens in shear having two or three layers of steel sheets connected by spot welding will be presented. The results will be implemented on a numerical model in order to study the behaviour of the beams presented above.

Laser welded built-up cold-formed steel beams: Experimental investigations

2008 ◽  
Vol 46 (7-9) ◽  
pp. 781-791 ◽  
Author(s):  
R. Landolfo ◽  
O. Mammana ◽  
F. Portioli ◽  
G. Di Lorenzo ◽  
M.R. Guerrieri
Keyword(s):  
Experimental Investigations ◽  
Steel Beams ◽  
Cold Formed Steel

Clinching of Steel Sheets Used in Automotive Industry

2015 ◽  
Vol 808 ◽  
pp. 75-79 ◽  
Author(s):  
Gábor Béres ◽  
József Danyi ◽  
Ferenc Végvári
Keyword(s):  
Experimental Research ◽  
Automotive Industry ◽  
Resistance Spot Welding ◽  
Heat Effect ◽  
Spot Welding ◽  
Steel Sheet ◽  
Research Work ◽  
Material Structure ◽  
Cold Forming ◽  
Steel Sheets

Clinching is a mechanical cold forming method to join two or more overlapping sheets without using of rivet. This technology is already in use for production of aluminium and steel sheet car body panels. This process is carried out without heat effect on the material structure. Thus the clinching is one of the technologies which may replace traditional processes as resistance spot welding or frictional spot welding. The clinching technology has been well known many years ago, but only during last decade gets more increased interest especially in automotive industry. This paper presents the results of experimental research work in field of clinching of different (high and soft) strength steel sheets developed for automotive industry.

Lateral Flexural-Torsion Buckling of Thin-Walled Cold-Formed Steel Beams with Holes - Design Resistance Evaluation Based on Test Results

2013 ◽  
Vol 368-370 ◽  
pp. 1683-1687 ◽  
Author(s):  
Marcela Karmazínová
Keyword(s):  
Steel Beams ◽  
Mathematical Function ◽  
Test Results ◽  
Resistance Evaluation ◽  
Normative Documents ◽  
Cold Formed Steel ◽  
Design Resistance ◽  
Thin Walled ◽  
Input Variables ◽  
European Standards

The paper is focused on problems of the design resistance of thin-walled cold-formed steel beams with holes, respecting the lateral flexural-torsion buckling effects. The attention is mainly paid to the design resistance determination using the results of experimental verification of the objective resistance and their statistic elaboration and probabilistic evaluation. The lateral buckling of thin-walled beams with holes is a specific problem, because of the holes influence on the torsion stiffness, and usual calculating procedures according to the rules given by the European Standards are not always generally usable. The methods based on the approaches of the design assisted by testing are used for the design resistance evaluation, here. The determination of the design resistance using test results respects the statistic characteristics and probabilistic distribution of all input variables, on which the resistance is depended. This method also takes into account the form of the probabilistic model of the resistance, from the viewpoint of the form of mathematical function and its influence on the resistance variability. The design resistance derivation applying the design assisted by testing can be used as an alternative procedure instead of the design resistance determination according to the normative documents, especially in the cases, when the usual procedures are not sufficiently usable.

scholarly journals Behavior of Polypropylene Filled Cold Formed Steel Profiles – Part B: Torsion

2019 ◽  
Vol 1 (2) ◽  
pp. 7-11 ◽  
Author(s):  
Mahyar Maali
Keyword(s):  
Composite Material ◽  
Polymer Material ◽  
Waste Recycling ◽  
Steel Beams ◽  
Filling Material ◽  
Torsional Behavior ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Waste Polymer

Torsional behaviors of col- formed steel beams are investigated for the webs which are filled by polypropylene. Four I and U profile beams filled with polypropylene were manufactured and tested. In the study, two specimens U100 and two specimens I100 profiles with 1.5 m length and 1.20 mm thickness and thin-walled cold-formed steel profiles were used. The aim of this study is to investigate the torsional behavior of the composite material formed by pouring the polymer material into the U and I profile molds after homogenous pulping. A total of two groups of samples will be obtained: empty cold-formed steel profiles and waste polymer. In this study, finely ground waste and/or raw PP (polypropylene) was used as filling material. The polypropylene is not only improved the torsional behavior strikingly; but also give a way on environmental profit for waste recycling.

WELDING TECHNOLOGIES FOR BUILT-UP COLD-FORMED STEEL BEAMS: EXPERIMENTAL INVESTIGATIONS

2018 ◽  
Author(s):  
Viorel Ungureanu ◽  
◽  
Ioan Both ◽  
Marius Grosan ◽  
Calin Neagu ◽  
...  
Keyword(s):  
Experimental Investigations ◽  
Steel Beams ◽  
Cold Formed Steel

Thin-Walled Cold-Formed Steel Beams with Holes in Lateral Flexural-Torsional Buckling

2013 ◽  
Vol 743 ◽  
pp. 170-175 ◽  
Author(s):  
Marcela Karmazínová ◽  
Jindrich Melcher ◽  
Martin Horáček
Keyword(s):  
Cross Section ◽  
Stability Problem ◽  
Design Procedure ◽  
Steel Structures ◽  
Torsional Stiffness ◽  
Steel Beams ◽  
Torsional Buckling ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Flexural Torsional Buckling

In this paper the study on lateral flexural-torsional buckling of steel sigma-cross-section beams with web holes will be presented. The analysis of corresponding stability problem is based on general approach derived for a group of beams including at least mono-symmetric sections loaded transversally to their plane of symmetry. The effective flexural and torsional stiffness of steel beams with holes has been verified by tests. The results of theoretical analysis were compared with specification design procedure and also with actual behaviour of set of beams investigated by experiments. The study conclusions aim to become the background of the supplements to specified provisions for the design of steel structures.

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