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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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Lumped damage model for local buckling in steel square hollow sections based on hinge energy and geometric nonlinearity

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Thin-Walled Structures 2025年 215卷

作者： Silva, Leonardo A.B. de Argôlo, Higor S.D. Amorim, David L.N.F. Post-graduate Programme in Civil Engineering Federal University of Alagoas Av. Lourival Melo Mota s/n Maceió Tabuleiro do Martins 57072-970 Brazil Disaster Research Institute Department of Civil Engineering Federal University of Sergipe Av. Marcelo Deda Chagas s/n São Cristóvão Rosa Elze 49107-230 Brazil

This paper proposes a lumped damage model for steel square hollow sections (SHS) with a nonlinear local buckling evolution law. Additionally, it proposes the incorporation of new equations into the numerical model to determine, in a theoretical way, parameters traditionally obtained through experimental or numerical calibration. In this model, the onset of local buckling is determined based on the stress/strain distributions of the cross-section. At the same time, the energy absorbed by the hinge is used to estimate the degradation process intensity after local buckling. To evaluate the performance of this model, numerical simulations were conducted on SHS under different geometries, axial loads, and collapse modes, and the results were compared with experiments from the technical literature. The numerical results exhibited behaviour similar to the experimental ones, satisfactorily representing the nonlinear behaviour after local buckling. © 2025 Elsevier Ltd

关键词： Local buckling Lumped damage mechanics Square hollow section

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Finite element analysis of walking vibration problems for tubular steel-concrete composite footbridges

Finite element analysis of walking vibration problems for tu...

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11th International Conference on Computational Structures Technology, CST 2012

作者： Debona, G.L. Santos Da Silva, J.G. Sieira, A.C.C.F. Da S. Vellasco, P.C.G. De Lima, L.R.O. Civil Engineering Post-Graduate Programme PGECIV Brazil Structural Engineering Department UERJ State University Rio de Janeiro Brazil

ISBN: (纸本)9781905088546

The main objective of this investigation is to present the finite element modelling of the dynamic behaviour of tubular composite (steel-concrete) footbridges subjected to human walking vibrations. The investigated structural system was based on a tubular composite (steel-concrete) footbridge, spanning 82.5 m. The structural model consists of tubular steel sections and a concrete slab. This investigation is carried out based on correlations between the experimental results related to the footbridge dynamic response and those obtained with finite element modelling. The finite element model enabled a complete dynamic evaluation of the tubular footbridge in terms of human comfort and its associated vibration serviceability limit states. The peak accelerations found in the present analysis indicated that the investigated tubular footbridge presented problems related with human comfort. Hence it was detected that this type of structure can reach high vibration levels that can compromise the footbridge user's comfort. © civil-Comp Press, 2012.

关键词： Structural dynamics

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Vibration analysis of tubular footbridges induced by human walking

Vibration analysis of tubular footbridges induced by human w...

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14th International Symposium on Tubular Structures, ISTS 2012

作者： Debona, G.L. Da Silva, J.G.S. Sieira, A.C.C.F. Da S. Vellasco, P.C.G. De Lima, L.R.O. Civil Engineering Post-Graduate Programme PGECIV State University of Rio de Janeiro UERJ Rio de Janeiro Brazil

ISBN: (纸本)9780415621373

The main objective of this investigation is to present the finite element modelling of the dynamic behaviour of tubular composite (steel-concrete) footbridges submitted to human walking vibrations. The investigated structural system was based on a tubular composite (steel-concrete) footbridge, spanning 82.5 m. The structural model consists of tubular steel sections and a concrete slab. This investigation is carried out based on correlations between the experimental results related to the footbridge dynamic response and those obtained with finite element modelling. The finite element model enabled a complete dynamic evaluation of the tubular footbridge in terms of human comfort and its associated vibration serviceability limit states. The peak accelerations found in the present analysis indicated that the investigated tubular footbridge presented problems related with human comfort. Hence it was detected that this type of structure can reach high vibration levels that can compromise the footbridge user's comfort. © 2012 Taylor & Francis Group, London.

关键词： Concrete slabs

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Regional validity of the parameters of a distributed runoff-erosion model in the semi-arid region of Brazil

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Science China(Technological Sciences) 2009年第11期52卷 3348-3356页

作者： SRINIVASAN Vajapeyam Srirangachar PAIVA Fernanda Maria de Lima Federal University of Campina Grande Post-graduate programme in Civil and Environmental Engineering Campus I 58429-900 Campina Grande PB Brazil

The present paper examines the validity of the application of a distributed rainfall-runoff-erosion model on a regional basis in a semi-arid region of Brazil. The model tested is known as WESP (Water Erosion Simulation Program) developed by Lopes (1987). The model simulates the hydrograph and the sediment graph for individual events and thus, the model when properly calibrated can serve as a predictive tool for runoff and soil erosion on an individual or a continuous basis. The possibility of the existence of regionally applicable values for the parameters of the model WESP would be very interesting from the point of view of predictability of runoff and soil erosion from ungauged basins in the region. For this purpose, data collected in several experimental units in the experimental basin of Sumé as well as in the experimental basin of So Joo de Cariri have been used. The model was calibrated and validated in each of the experimental units (consisting of erosion plots and micro-basins) and the average value from all of the units for each of the parameters was considered to be the regional value. With these average values, all the events in all the experimental units were simulated. The results show that the runoff and erosion values simulated with this single parameter set were very good in all the units, being well within the acceptable deviations.

关键词： regional parameters model WESP experimental basins semi-arid region soil erosion

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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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Non-linear dynamic analysis of steel-concrete composite floors subjected to human rhythmic activities

Non-linear dynamic analysis of steel-concrete composite floo...

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11th International Conference on Computational Structures Technology, CST 2012

作者： Lopes, E.D.C. Gonçalves, S.G. Gaspar, C.M.R. Santos Da Silva, J.G. De Andrade, S.A.L. Civil Engineering Department Pontifical University Catholic of Rio de Janeiro PUC-Rio Brazil Civil Engineering Post-graduate Programme PGECIV Brazil Structural Engineering Department UERJ State University of Rio de Janeiro Brazil

ISBN: (纸本)9781905088546

The main objective of this paper is to investigate the influence of steel-concrete interaction degree (from total to various levels of partial interaction) over the nonlinear dynamic behaviour of composite floors when subjected to human rhythmic activities. The investigated structural model was based on a steel-concrete composite floor spanning 40m by 40m, with a total area of 1600m2. The structural system consisted of a typical composite floor of a commercial building. The peak accelerations found in the present analysis indicated that the investigated floor presented problems related with human comfort. Hence it was detected that this type of structure can reach high vibration levels that can compromise the user's comfort. © civil-Comp Press, 2012.

关键词： Floors

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Vibration analysis of a production platform induced by mechanical equipment

Vibration analysis of a production platform induced by mecha...

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10th International Conference on Computational Structures Technology, CST 2010

作者： Rimola, B.D. Da Silva, J.G.S. Sieira, A.C.C.F. De Lima, L.R.O. Da Neves, L.F.C. Civil Engineering Post-graduate Programme UERJ PGECIV State University of Rio de Janeiro Brazil Structural Engineering Department UERJ State University of Rio de Janeiro Brazil Civil Engineering Department University of Coimbra ISISE Portugal

ISBN: (纸本)9781905088386

The competitive trends of the world market have long been forcing structural engineers to develop minimum weight and labour cost solutions. A direct consequence of this new design trend is a considerable increase in problems related to unwanted floor vibrations. For this reason, the structural floors systems can become vulnerable to excessive vibrations, for example, produced by impacts such as mechanical equipments (rotating machinery). This way, the present paper investigated the dynamic behaviour of a production platform made of steel and located in Santos basin (Merluza field), São Paulo, Brazil, when subjected to impacts produced by mechanical equipments (rotating machinery). The structural model consists of two steel decks with a total area of 1915 m2 (upper deck: 445 m2 and lower deck: 1470 m2), supported by piles. A numerical analysis was made, in order to assess the dynamic impacts on the deck structure coming from the electrical generators and compressors. Based on the peak acceleration values, obtained on the structure steady-state response, it was possible to evaluate the structural model performance in terms of human comfort, maximum tolerances of the mechanical equipment and vibration serviceability limit states of the structural system. © civil-Comp Press, 2010.

关键词： Vibration analysis

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Dynamic Analysis of Steel-Concrete Composite Building Floors Subjected to Human Rhythmic Activities

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ce/papers 2017年第2-3期1卷 4000-4009页

作者： Campista, Fernanda Fernandes da Silva, José Guilherme Santos Civil Engineering Post-graduate Programme PGECIV State University of Rio de Janeiro UERJ Brazil

This work aims is to investigate the structural dynamic response of steel-concrete composite floors, when subjected to rhythmic human activities, based on experimental tests and numerical modelling, from the point of view of human comfort. The main focus of this paper is to study the effect of the dynamic interaction between the occupants and the floors, representing these people by SDOF biodynamic models (mass-spring-damper systems), in order to better evaluate the dynamic response and the vibration serviceability states. This way, the investigated structural model is related to a steel-concrete composite building which is composed of three floors used for aerobics classes, with dimensions of 20m × 20m, a total area of 1200m2 (3 × 400m2) and a ceiling height of 4m. The numerical modelling of the structure was performed by ANSYS program and was based on the finite element method (FEM). In order to evaluate the dynamic response of the investigated steel-concrete composite building, accelerations associated with 32 individuals practicing rhythmic activities were experimentally obtained to introduce them into the finite element model. Thus, the dynamic response of the building floors was evaluated in terms of the peak accelerations, RMS and VDV values, according to human comfort criteria and considering situations of the design practice. © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Floors

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Vibration Analysis and Human Comfort Investigation of a Steel-Concrete Composite Building under Nondeterministic Wind Loadings

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ce/papers 2017年第2-3期1卷 4010-4019页

作者： da Silva, José Guilherme Santos Barboza, Rafael Rangel Civil Engineering Post-graduate Programme PGECIV State University of Rio de Janeiro UERJ Brazil

Based on a favourable economic scenario combined with a significative technological advance in science materials and also construction processes, it must be emphasized that the Brazilian cities have shown substantial growth, regarding the construction of tall and slender buildings. This architectural trend has conducted the design of these buildings to solutions composed by very flexible structural systems, resulting in slender buildings with very low natural frequencies values and therefore more susceptible to problems of excessive vibrations, undesirable crack openings and even discomfort to the occupants. This way, having in mind the slenderness levels presented more recently, these buildings need to have their structural dynamic behaviour investigated, in order to ensure the human comfort. Thus, this research work aims to investigate the dynamic structural behaviour and also evaluates the human comfort of tall buildings, when subjected to the non-deterministic action of the wind. This way, the structural behaviour of a forty eight-storey steel-concrete composite building with 172.8m high subjected to the nondeterministic wind dynamic actions is investigated. The results obtained along the numerical analysis, in terms of the displacements and accelerations values, in time and frequency domain, are compared with the limits proposed by technical guides and design recommendations, aiming to evaluate the human comfort levels of the analysed building, regarding to the situations of the design practice. © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

关键词： Structural dynamics

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