TEDE Coleção:http://www.bdtd.uerj.br/handle/1/36742024-03-29T08:47:47Z2024-03-29T08:47:47ZAnálise e contribuição à Teoria de Grelha considerando a flexibilidade dos apoiosSilva, Thiago Cunha dahttp://www.bdtd.uerj.br/handle/1/215442024-03-07T16:25:19Z2023-11-28T00:00:00ZTítulo: Análise e contribuição à Teoria de Grelha considerando a flexibilidade dos apoios
Autor: Silva, Thiago Cunha da
Primeiro orientador: Tavares, Maria Elizabeth da Nóbrega
Abstract: The increase in the use of software for structural design has several benefits, including the possibility of cost reduction by carrying out more precise analysis and optimizing design. With optimized design, even when satisfactory safety conditions are presented, structural elements become more flexible. Building beams often exhibit considerable displacements, which can influence the reactions of slabs and also their dynamic properties. The various models for slab analysis and design have some simplifications. One of the most widely adopted simplifications is the consideration of rigid supports. Although commonly adopted, this configuration can considerably alter the forces acting on the slab, leading to pathologies and unsatisfactory structural performance, as the supports may have a certain degree of flexibility. The proposed model contribution to Grid Theory establishes equations that change the calculation of slabs to consider the flexibility of supports for any level of flexibility of the border beams. An analytical study of the influence of support flexibility on the determination of slab requests and displacements was carried out. A comparative analysis between the proposed model and numerical models developed in SAP2000 software was performed. 192 models were analyzed in simply supported slabs and 168 models in slabs fixed at the edges, totaling 360 numerical analyses. It was verified that the proposed model brought precise results in most cases when compared with the results obtained in numerical models for cases of slabs with rigid and flexible edges. In addition to numerical analysis, data from a test on a slab with flexible supports was used. The results obtained by applying the proposed model to the experimental data indicated good accuracy of the model.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Tese2023-11-28T00:00:00ZAvaliação do comportamento estrutural dinâmico não determinístico de edifícios altos considerando-se o efeito da ação transversal do vento e a modelagem da interação solo-estruturaBastos, Leonardo de Souzahttp://www.bdtd.uerj.br/handle/1/215042024-03-04T16:57:10Z2020-02-13T00:00:00ZTítulo: Avaliação do comportamento estrutural dinâmico não determinístico de edifícios altos considerando-se o efeito da ação transversal do vento e a modelagem da interação solo-estrutura
Autor: Bastos, Leonardo de Souza
Primeiro orientador: Silva, José Guilherme Santos da
Abstract: In the last few decades, large Brazilian cities have shown substantial growth in relation to the design and construction of tall and slender buildings. This architectural trend has produced flexible structural systems, with very low natural frequency values; and therefore, more susceptible to excessive vibration problems, coming from the wind dynamic action. According to this context, it is necessary that the buildings structural analysis can be carried out more precisely, considering the wind dynamic actions, in a more realistic way, based on the correct definition of their nondeterministic dynamic properties. This way, it should be noted that in addition to considering the wind longitudinal dynamic actions (along-wind), the dynamic actions acting on the structure in relation to the transverse direction (across-wind), caused by the existence of vortices, also must be taken into account in the analysis. On the other hand, the relevance of considering the soil-structure interaction (modelling of foundations) is highlighted, having in mind the influence of this effect on the structure global stiffness. Therefore, this research work aims the investigation of the nondeterministic dynamic structural behaviour and the human comfort analysis of tall buildings. Thus, in this study three building projects are considered: two reinforced concrete buildings with heights of 90 m and 140 m, respectively, and one building based on a steel-concrete composite structure with a total height of 173 m. The Spectral Representation Method (MRE) was used to characterize the longitudinal wind dynamic actions. The effect of wind dynamic actions associated to the transversal direction (vortex effect) was conceived based on the development of an analysis methodology called the Modified Spectral Representation Method (MRE-M), considering the coefficients obtained through the use of data from experimental tests carried out in a wind tunnel. The results achieved in this study demonstrate the relevance of modelling the soil-structure interaction, which contributes to the decrease in the natural frequencies values; and, consequently, it produces an increase in the buildings longitudinal and transversal accelerations. It is also noteworthy that in most design situations, the transversal accelerations present higher values, thus representing a key factor for the analysis and verification of the tall buildings human comfort.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Tese2020-02-13T00:00:00ZUm modelo simplificado de radier estaqueado em solo estratificado aplicado a casos com interação solo x estruturaVitor, Karina Almeidahttp://www.bdtd.uerj.br/handle/1/214952024-03-01T15:18:52Z2024-01-11T00:00:00ZTítulo: Um modelo simplificado de radier estaqueado em solo estratificado aplicado a casos com interação solo x estrutura
Autor: Vitor, Karina Almeida
Primeiro orientador: Danziger, Bernadete Ragoni
Abstract: The research aims to present a simple method for the design estimation of piled raft foundations. The advantage of the method is that it has a general character, being able to contemplate a finite semi-space, stratified in the vertical and horizontal directions, with settlements that are nullified at the resistant rock layer. The developed procedure allows the estimation of settlements of a piled raft designed to function as a pile group enhanced by the raft, justifying the estimation of settlements predicted by the elasticity theory. After calibrating the proposal with methods known in the literature, with numerical analyses and instrumented cases, the procedure was adopted in two documented cases in different situations. The first case deals with a construction based on a shallow foundation that presented very poor behaviour. With the addition of some piles, a solution in a pile rafted foundation could reduce distortion settlements to a tolerable range. The second case deals with a deep foundation structure in which the monitoring of settlements indicated very small values, with much room for optimization of the number of piles. When applying the procedure to these cases, many conclusions already highlighted in the bibliographic research were observed, for other cases. The author expects that this simple procedure will be useful to improve the use of piled raft foundations as an alternative in current foundation.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Tese2024-01-11T00:00:00ZAnálise estrutural dinâmica de pisos de edifícios submetidos a atividades humanas rítmicas com base no uso de modelos biodinâmicos: modelagem experimental e numéricaSousa, Felipe Almeida dehttp://www.bdtd.uerj.br/handle/1/207402024-02-27T17:52:26Z2023-08-11T00:00:00ZTítulo: Análise estrutural dinâmica de pisos de edifícios submetidos a atividades humanas rítmicas com base no uso de modelos biodinâmicos: modelagem experimental e numérica
Autor: Sousa, Felipe Almeida de
Primeiro orientador: Silva, José Guilherme Santos da
Abstract: This research paper aims to evaluate the dynamic structural response of building floors under rhythmic human loading (aerobic activities). To achieve this objective, a biodynamic model consisting of mass, damping, and stiffness, represented as a Single Degree of Freedom (SDOF) system, is proposed to simulate rhythmic human actions on building floors and assess the dynamic human-structure interaction effect. The study focuses on the dynamic analysis of an existing reinforced concrete floor located on the 8th floor of the University of the State of Rio de Janeiro (UERJ), with dimensions of 16 m x 36 m and an area of 576 m². Initially, experimental modal analyses are performed using different strategies to evaluate the overall dynamic behavior of the investigated floor, aiming to calibrate the finite element model developed to represent the structure. Subsequently, dynamic experimental monitoring tests are conducted based on forced vibration analyses applied to the concrete slabs of the floor, allowing a comparative analysis between the experimental dynamic structural response and the results obtained through numerical modelling. Traditional mathematical functions representing rhythmic human dynamic actions, corresponding to "force-only" models, as well as biodynamic systems, are employed in the study. Based on the dynamic responses obtained, it is observed that the biodynamic models produce results closer to those observed in the experimental tests on the floor. These models consider the dynamic human-structure interaction effect, as well as individual characteristics such as mass, damping, and stiffness, resulting in attenuations of displacement and acceleration values. Additionally, a parametric study is conducted to analyze the dynamic structural behavior in relation to human comfort criteria, considering the limits established by relevant standards and design criteria. The results indicate that traditional dynamic loading models (only force) tend to yield more conservative dynamic responses, while modelling based on biodynamic systems provides response values (displacements and accelerations) closer to those determined through dynamic experimental monitoring of the investigated floor. Finally, it is emphasized that the proposed analytical methodology in this research work can be considered a viable alternative for characterizing rhythmic human dynamic actions on building floors, taking into account the dynamic human-structure interaction.
Instituição: Universidade do Estado do Rio de Janeiro
Tipo do documento: Tese2023-08-11T00:00:00Z