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STRUCTURAL ASSESSMENT OF COMPOSITE HIGHWAY BRIDGES CONSIDERING VEHICLE-BRIDGE DYNAMIC INTERACTION

ce/papers 2024年第1-2期7卷 165-174页

作者： da Silva, Ana Célia Soares Alencar, Guilherme Santana da Silva, José Guilherme Santos Civil Engineering Post-graduate Program [PGECIV/UERJ Brazil Brazil Brazil

Over time, as the bridge deck pavement deterioration process increases, the calculated vertical translational displacements and stresses are higher. In this context, the chances of mechanical failure occurrence increase and may cause limitation in the service life of steel and composite (steel-concrete) bridges. Thus, the current work presents a methodology for fatigue analysis developed by the authors through the years. The methodology is devoted specifically for the assessment of composite bridges employing the hot-spot local S-N approach and a coupled vehicle-pavement-bridge system considering progressive pavement deterioration with stochastically generated roughness profiles. © 2024 Ernst & Sohn GmbH.

关键词： Deterioration

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INVESTIGATION OF FLEXURAL BEHAVIOUR OF STAINLESS STEEL CHANNEL SECTIONS

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ce/papers 2024年第1-2期7卷 240-249页

作者： de Lima, Cláucio Gonçalves Rodrigues, Monique Cordeiro Pereira, e Fernanda Lins Gonçalves PGECIV – Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil

In this paper, the design of austenitic stainless steel channel sections subjected to minor axis bending, specifically with tension in the web ("u" orientation) is analyzed. The values of moment resistance are predicted using Eurocode 3 criteria and the Continuous Strength Method (CSM), which are then compared with numerical models to assess effectiveness. The modeling is performed through ANSYS and calibrated with literature tests. It was found that Eurocode presents a considerable disparity in results, as well as an overly cautious response (on average, half the numerical load). The CSM reflects the performance more accurately but still with a certain level of conservatism (on average, around 35% lower). © 2024 Ernst & Sohn GmbH.

关键词： Codes (standards)

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Influence of chord stresses on the strength of RHS joints 9

Influence of chord stresses on the strength of RHS joints

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9th International Conference on Advances in Steel Structures, ICASS 2018

作者： Mendes, Flávio F. de Lima, Luciano R.O. da Vellasco, Pedro C. G. S. Rodrigues, Monique C. Neves, Luis F.C. PGECIV - Civil Engineering Post-Graduate Program UERJ - State University of Rio de Janeiro Brazil Structural Engineering Department UERJ - State University of Rio de Janeiro Brazil INESCC Civil Engineering Department University of Coimbra Portugal

ISBN: (纸本)9889914093

Extensive work has been performed to address the technological and design issues of tubular joints in the last decades. Several international design codes and recommendations explicitly cover the design of tubular joints such as Eurocode 3, ISO14346 and NBR16239. Experimental results on the influence of the chord stresses over the brace load capacity have been published in the literature. These results showed that compressive chord stresses considerably reduce the joint resistance. However, very few studies indicated the same reduction in load carrying capacity for joints under the action of chord tensile forces. To investigate this influence, an experimental program comprising thirteen tests was carried out, i.e. tests without chord axial forces;tests with compressive chord forces;and other ones with tensile chord forces. The obtained results were compared to the design provisions. This assessment indicated that the results obtained for chords without axial forces and with compressive forces, in experiments were safe when compared to the values predicted by all the investigated standards. On the other hand, the results associated with cases with chord tension forces proved to be conservative. Copyright © 2018 by The Hong Kong Institute of Steel Construction.

关键词： Software testing

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Structural behaviour of T RHS joints subjected to chord axial force 15

Structural behaviour of T RHS joints subjected to chord axia...

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Proceedings of the 15th International Symposium on Tubular Structures, ISTS 2015

作者： Nizer, A. De Lima, L. Da S. Vellasco, P. De Andrade, S. Da S. Goulart, E. Da Silva, A.T. Da C. Neves, L.F. PGECIV – Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil INESCC Civil Engineering Department University of Coimbra Portugal

ISBN: (纸本)9781138028371

This paper presents an experimental and numerical analysis of the chord normal stresses influence on the "T" tubular joints behaviour. The experimental program consisted of six tests: two without chord axial forces;two with compressive chord forces;and the remaining two with tensile chord forces. These results were compared to numerical results obtained with the aid of the ANSYS 12.0 software, and to the design provisions present in the: Eurocode 3;NBR 16239:2013 Brazilian standard and ISO 14346. This assessment indicated that the results obtained for chords without axial forces and with compressive forces, in both experiments and numerical analyses, were safe when compared to the values predicted by all the investigated standards, where the best fit was obtained by ISO 14346. On the other hand, the results associated to cases with chord tension forces proved to be conservative. © 2015 Taylor & Francis Group, London.

关键词： Software testing

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Structural assessment of composite seam-welded rectangular hollow columns

Structural assessment of composite seam-welded rectangular h...

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作者： Castanheira, Deborah Souza De Lima, Luciano Rodrigues Ornelas Da Silva Vellasco, Pedro Colmar Gončalves Da Nóbrega Tavares, Maria Elizabeth PGECIV Civil Engineering Post Graduate Program UERJ State University of Rio de Janeiro Rio de Janeiro Brazil Structural Engineering Department UERJ State University of Rio de Janeiro Rio de Janeiro Brazil

Structural elements made of seam-welded hollow sections are considerably less expensive than their seamless equivalents. This is a strong incentive for their use, but the current steel design standards still contain recommendations for seam-welded hollow sections based on test results performed with sections produced using outdated steel grades and fabrication processes. These design procedures are even more conservative when applied to composite tubular seam-welded elements. This paper presents an experimental campaign performed to investigate the structural behaviour of steel- and concrete-filled composite columns made with seam-welded rectangular hollow profiles. The experiments involved columns with only steel sections, concrete-filled and concrete-filled plus additional reinforcing bars. The main aim of the tests was to identify the contribution of each component in the overall structural response. The results enable an evaluation of the design recommendations present in Eurocode 4 aiming to determine less conservative buckling curves to be used for the investigated composite columns made of seam-welded rectangular hollow sections.

关键词： Reinforced concrete

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An assessment of rolled stainless steel angles under compression 7th

An assessment of rolled stainless steel angles under compres...

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7th International Conference on Structural engineering, Mechanics and Computation, 2019

作者： da Sirqueira, A.S. da Vellasco, P.C.G.S. de Lima, L.R.O. da Silva, A.T. Rodrigues, M.C. Vellasco, M.M.B.R. PGECIV-Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil Electrical Engineering Department PUC-Rio – Pontifical Catholic University of Rio de Janeiro Brazil

ISBN: (纸本)9781138386969

Stainless steel has been used in several types of constructions. Although many of their mechanical properties are similar to the properties of carbon steel, their nonlinear characteristics imply in different design rules. This non-linearity mainly affects the response to local and flexural buckling. The Eurocode 3: Part 1-4 (2006) stainless steel design standard can be applied to hot rolled, welded and cold formed products, but the provisions of this code are rather conservative, with a limited application due to the lack of experimental data. Thus, one of those areas that require attention and study concerns the behaviour of columns made of rolled stainless steel angles. This paper describes an experimental campaign made on rolled stainless steel angles under axial compression. The tests were performed on stainless steel rolled angles with lengths varying from 150 mm to 1400 mm while the collapse involved: flexural-torsional and flexural buckling modes. © 2019 Taylor & Francis Group, London, UK.

关键词： Hot rolling

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12.06: Numerical analysis of stainless steel, concrete encased and carbon steel double skin tubular stub columns

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ce/papers 2017年第2-3期1卷 3509-3518页

作者： de Araújo, Raphaella Oliveira de Lima, Luciano Rodrigues Ornelas da Silva Vellasco, Pedro Colmar Gonçalves da Silva, André Tenchini PGECIV – Civil Engineering Post-Graduate Program State of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

The use of stainless steel as formwork for concrete columns provides several benefits for the structure, including the high corrosion resistance, durability, fire resistance, ease of maintenance and high aesthetic value. The use of composite systems in columns has been a major breakthrough in bridges and viaducts. A particular advantage of the composite columns is the reduction of cross sectional area, speed of construction, easy maintenance and material saving when compared to conventional reinforced concrete structures. These advantages are related to the idea that the columns are concrete filled eliminating the use of forms and the need for extra steel reinforcing bars. The investigated system adopts a second carbon steel tube inside the primary stainless steel tube composing the structural system made of concrete-filled double skin composite tube columns (CFDSCT). This study aims to develop numerical models, using the finite element method and considering geometric imperfections. The structural behaviour was assessed through a nonlinear analysis and was later compared to compressive tests performed in the laboratory. After the completion of the numerical models calibration, a parametric analysis was performed to investigate the influence of parameters like the diameter, thickness and height of the stainless steel tube (outer) while its results were also compared to predictions made by traditional design equations. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Stainless steel

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ASSESSMENT OF SHS TUBULAR T JOINTS SUBJECTED TO CHORD AXIAL FORCES

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ce/papers 2019年第5-6期3卷 213-222页

作者： Correia, Tatiana P. de Lima, Luciano R. O. Rodrigues, Monique C. da S. Vellasco, Pedro C. G. da Silva, André T. PGECIV – Civil Engineering Graduate Program State University of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

This paper aims to investigate the behaviour of T-type welded joints consisting of cold-formed steel square hollow sections (SHS), with β equal to 1.0, with and without sidewall plate reinforcement. A particular focus is on the preload effect in the chord, which is subjected to different levels of tension and compressive axial forces. For this purpose, a finite element numerical study was developed in ANSYS software, based on the development of calibrated models with experimental results. The results were compared with analytical formulations prescribed by standards and in the literature. © 2020 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Axial flow

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BEHAVIOUR OF AUSTENITIC STAINLESS STEEL ANGLES UNDER CENTERED COMPRESSION

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ce/papers 2019年第5-6期3卷 223-233页

作者： Sarquis, Fernando R. de Lima, Luciano R. O. da S. Vellasco, Pedro C. G. Rodrigues, Monique C. da Silva, André T. PGECIV –Graduate Program in Civil Engineering State University of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

This paper presents an experimental and numerical analysis of 304 austenitic stainless steel hot-rolled equal leg angles with fixed end supports. The experimental programme consisted of material characterisation under tension and compression tests, initial geometrical imperfections measurements and full-scale tests to obtain ultimate loads and associated failure modes. Besides the experimental programme, a finite element numerical model was also developed to expand the studied sections and lengths through a parametric study to verify the accuracy of Eurocode 3 – Part 1.4 buckling curve. © 2020 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Austenitic stainless steel

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Structural performance of stainless lap bolted joints

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ce/papers 2017年第2-3期1卷 3593-3602页

作者： Freire, Raphael da Silva Vellasco, Pedro Colmar Gonçalves da Silva, André Tenchini de Lima, Luciano Rodrigues Ornelas PGECIV – Civil Engineering Post-Graduate Program State of Rio de Janeiro – UERJ Brazil Structural Engineering Department State University of Rio de Janeiro – UERJ Brazil

The stainless steel employed in the structural elements present high corrosion resistance, durability, fire resistance and high aesthetic value compared to those constructed using carbon steel. In contrast, the stainless steel structures design is made following the requirements based on the carbon steel analogies. In fact, the structural performance of stainless steel is complex and dissimilar where some stainless grades presenting nonlinear tension versus strain curves without a defined yield plateau and large strain hardening. These properties influence on structural performance of the lap bolted joints. The Eurocode 3 pt. 1.4, one of the most adopted design codes, recommends two structural design criteria for the stainless steel elements under tension: ultimate resistance of the net cross-section at holes or plastic resistance of the gross cross-section. The present work aimed to investigate the structural response of lap bolted joints made of three stainless steel grades: austenitic, ferritic and duplex. Nonlinear numerical analyses has been carried out using ABAQUS 6.14 program where the response have shown a good agreement in terms of the maximum loads and failure modes when compared to the performed experiments. The results indicated a conservative level of safety from Eurocode 3 pt. 1.4 code provisions in comparison to the experimental results. © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Finite element method

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