03.33: Experimental assessment of tolerances for the fabrication of laser‐cut steel joints

Kanyilmaz, Alper; Castiglioni, Carlo Andrea; Brambilla, Giovanni; Gjoka, Kristian; Galazzi, A.; Raso, Sergio; Valli, Alberto; Brugnolli, Marco; Hojda, Ralf

doi:10.1002/cepa.117

Cited by 18 publications

(22 citation statements)

References 1 publication

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“…where , 12 and ,2 are the bending moments of the plastic hinges, while 1 , 2 and are kinematic parameters which depends on , and (external radius of the column). 4…”

Section: Theoretical Modelmentioning

confidence: 99%

Chord failure resistance of 3D cut welded connections with CHS columns and through I‐beams

2021

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This paper investigates the mechanical behaviour of a novel typology of steel beam‐to‐column connection made by welding circular hollow section (CHS) columns with through‐all double‐tee beams. Such connection represents an alternative to the classical configuration with the I‐beam simply welded to the external surface of the hollow profile for which Eurocode 3 part 1.8 provides specific design rules resulting from the “ring model” theory. The main features of connections with through‐all beams derive from a change of the resisting mechanism which leads to a significant increase of stiffness and resistance. Nevertheless, such a change of the mechanical behaviour, strictly affected by the different plasticity pattern, has not been embedded in the ring model theory, yet. Instead, experiments and finite element (FE) simulations have been carried out proving that the resistance exhibited by CHS to through‐all axially loaded plates is about 2‐3 times higher than resistance referred to CHS to branch plates. The last‐mentioned connections represent the basic components in order to assess the flexural strength of connections made by CHS and I‐beams. This means that doubling the resistance of connections with beam welded to the external surface of the column, as some studies have proposed, leads to a significant underestimation of the resistance. Within this framework, in this paper the flexural resistance of connections with CHS columns and through‐all I‐beams is assessed by developing experimental tests and analytical models aiming to propose a new design equation. Specifically, two cyclic ad two monotonic tests on real scale beam‐to‐column connections have been executed at the laboratory of the University of Salerno. Subsequently, finite element (FE) models have been calibrated and verified against the experimental results. Then, the developed FE models have been extended to perform parametric analyses to be used to verify the accuracy of a new theoretical approach able to predict the resistance of such a kind of connections. The theoretical approach has been developed basing on the upper‐bound theorem and exploiting the previous knowledge based on the so‐called ring model. The proposed formulation, when compared to the available experimental data and FE simulations, have proved to exhibit a high accuracy.

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“…where , 12 and ,2 are the bending moments of the plastic hinges, while 1 , 2 and are kinematic parameters which depends on , and (external radius of the column). 4…”

Section: Theoretical Modelmentioning

confidence: 99%

Chord failure resistance of 3D cut welded connections with CHS columns and through I‐beams

2021

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“…The first solution is very easy to manufacture, but the obtained connection provides low stiffness and resistance such that it can be adopted only in the case of pinned or semi-continuous frames [9]. The second and the third solution, instead, are good alternatives but the need of conceiving complex special elements [10] represents a relevant drawback. The fourth approach, instead, induces the slowdown of the construction process due to the pouring of concrete on-site [11].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the cut of the tubular profile according to the shape of the double-tee section guarantees the beam to cross the CHS before welding both the members, increasing, in such a way, both the stiffness and the resistance of the joint without appealing to additional plates or concrete. Because of these benefits, a relevant interest in the technological aspects [10] and mechanical behaviour exhibited by the aforementioned beam-to-column connection recently arose. In particular, at the University of Salerno, experimental, numerical and theoretical activities have been carried out in order to study the resistance and the stiffness of the analysed joint.…”

Section: Introductionmentioning

confidence: 99%

Component Modelling of Connections Between Circular-Hollow-Sections and Through-All Members

Saldutti¹,

Benedetto²,

Latour³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The recent use of the 3D Laser Cutting Technology in the field of civil engineering has led to the development of novel typologies of steel beam-to-column connections made by welding circular hollow section columns (CHS) to through-all members. The main feature of these joints is that they are able to provide higher flexural strength, stiffness and energy dissipation capacity compared to the corresponding joints with elements simply welded to the external surface of the hollow section. Currently, there are no codified rules for such a type of structural details and, consequently, the design of these joints implies the development of complex FE models. Aiming at filling the knowledge gap regarding the structural flexural behaviour of CHS through I-beam joints, a research activity is currently ongoing at the STRENGTH laboratory of the University of Salerno with the objective to provide simple analytical tools for the design and modelling of such connections through the component method, both under monotonic and cyclic loading conditions. This paper deals with the preliminary study of the behaviour of one of the elementary components characterising the response of beam-to-column joints composed by CHS columns and Ibeams, which is the "plate transversally welded to the column in tension/compression". This component is meant to model the local behaviour exhibited by the CHS tube at the upper/lower beam flange level. This component is very important because it governs the deformability of the connection and may limit the resistance of the joint due to the local failure of the CHS tube. In the performed work, monotonic and cyclic tests on specimens representative of realistic geometric configurations of beam-to-column joints have been carried out. Subsequently, a finite element (FE) model, representative of the analysed connection, has been developed and validated against the experimental results.

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“…Nevertheless, a formulation to predict the flexural strength of such a kind of joint has been derived based on the ring model theory developed by Togo [ 66 ] and subsequently deepened by Wardenier, de Winkel, Packer and Zhao [ 67 , 68 , 69 , 70 , 71 , 72 ]. Referring to the second and the third solution, instead, complex structural details have to be conceived, but with the benefit of increasing both stiffness and resistance [ 73 , 74 ]. Instead, the last solution is out of interest because of the required pouring concrete on-site, which slows the construction process [ 54 , 75 ].…”

Section: Introductionmentioning

confidence: 99%

“…Such a solution has only been recently introduced thanks to the adoption of 3D-laser cutting technology (3D-LCT) in the field of civil engineering. However, many efforts have been devoted to this topic, as it is clearly referring to the works by Voth [ 65 , 75 ] and Kanyilmaz [ 73 , 74 ].…”

Section: Introductionmentioning

confidence: 99%

Stiffness Prediction of Connections between CHS Tubes and Externally Welded I-Beams: FE Analyses and Analytical Study

2020

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Double-tee profiles are the most popular members in Europe and the USA for steel structures. However, more efficient cross-sections, such as circular hollow sections (CHSs), could be adopted, since they can provide higher aesthetic, economic and mechanical benefits, with the only drawback of more complex connections such as in the case of I-beams welded to the external surface of circular hollow profiles. Based on the ring model theory, developed by Togo, a rule to design the flexural resistance of such a connection has been included in the Eurocode 3 part 1.8, while no formulations are provided to predict the corresponding initial stiffness. The present work aims at filling this knowledge gap, adopting an approach based on experimental, numerical and analytical work. A monotonic and a cyclic test have been performed on two beam-to-column sub-assemblies; the experimental outcomes have been exploited to validate a finite element (FE) model developed in Abaqus and used to numerically perform the monotonic loading simulations of 30 joints. Afterwards, starting from the extracted information about stiffness, a regression analysis was carried out to define the coefficient of a design equation analytically derived applying the component method approach. The regression analysis is characterized by a coefficient of variation equal to 0.19.

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03.33: Experimental assessment of tolerances for the fabrication of laser‐cut steel joints

Cited by 18 publications

References 1 publication

Chord failure resistance of 3D cut welded connections with CHS columns and through I‐beams

Chord failure resistance of 3D cut welded connections with CHS columns and through I‐beams

Component Modelling of Connections Between Circular-Hollow-Sections and Through-All Members

Stiffness Prediction of Connections between CHS Tubes and Externally Welded I-Beams: FE Analyses and Analytical Study

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