Three Dimensional Frames
Mostrando 1-12 de 36 artigos, teses e dissertações.
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1. Finite element implementation for the analysis of 3D steel and composite frames subjected to fire
This paper presents a finite element formulation for the numerical analysis of three-dimensional framed steel, reinforced concrete or composite steel and concrete structures subjected to fire. Several specialized and commercial programs may be used for the analysis of structures in fire condition. Within this context, the purpose of this work is to present t
Lat. Am. j. solids struct.. Publicado em: 2014-01
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2. Crashworthiness study of a civil aircraft fuselage section
This paper studies the crashworthiness characteristics of a fuselage section and its improvement. A full-scale three-dimensional finite element model of the fuselage section is developed using a nonlinear finite element code, PAM-CRASH. The simulation is implemented to determine the structural deformation and impact response in terms of peak loads and accele
Lat. Am. j. solids struct.. Publicado em: 2014
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3. Modelos numéricos de vigas mistas de aço e concreto pertencentes a sistemas de pisos mistos de pequena altura em situação de incêndio / Numerical modelling of composite slim floor beams in fire
Slim floor frames consists on structural system in which the steel beam is completely or partially inserted in a concrete slab, that is usually used in profiled steel decks systems. The main goal of the slim floor systems is to obtain a minimum height of the composite beam section and, consequently, achieve a higher height of the floor or a lower total heigh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2012
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4. Utilização da transformada de características invariante a escala (SIFT) na automatização da obtenção de pontos do Sistema de Imagens Tridimensional Híbrido (SITH) / Using the scale invariant feature transform (SIFT) in the automation of getting points of the three-dimensional hybrid imaging system (SITH)
This dissertation presents an improvement of the Three-Dimensional Hybrid Imaging System (SITH) that is used to obtain a three dimensional surface relief of a particular region from the same two consecutive air frames it. Photogrammetry is the science and technology used to obtain reliable information from images acquired by sensors. Improving the automation
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2010
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5. Avaliação da rigidez de pórticos tridimensionais de concreto armado / Evaluation of stiffness in three-dimensional frames of reinforced concrete
An evaluation of stiffness in three-dimensional frames is important to ensure safety in structural projects, especially in tall buildings, where both ultimate limit state and serviceability limit state have to be considered. In reinforced concrete buildings, this evaluation is calculated through an analysis of global stability, either through approximate met
Publicado em: 2009
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6. Three-dimensional flow calculations of axial compressors and turbines using CFD techniques.
With the advent of powerful computer hardware, Computational Fluid Dynamics (CFD) has been vastly used by researches and scientists to investigate flow behavior and its properties. The cost of CFD simulation is very small compared to the experimental arsenal as test facilities and wind-tunnels. In the last years many CFD commercial packages were developed an
Publicado em: 2009
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7. Um modelo geometricamente exato de barras com grandes deformações, que considera a distorção e o empenamento geral da seção transversal, e sua discretização pelo método dos elementos finitos. / A fully nonlinear geometrically exact multi-parameter rod model that incorporates general in-plane and out-of-plane cross-sectional changes, and its discretization by Finite Element Method.
The main purpose of this work is to present a fully nonlinear geometrically-exact multi-parameter rod model that incorporates general in-plane cross-sectional changes as well as general out-of-plane cross-sectional warping. The formulation constitutes an extension of the earlier works presented in [1] to [6], [8] and [9], in the sense that the restrictions t
Publicado em: 2008
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8. Desenvolvimento de programa livre para análise de pórticos tridimensionais considerando-se a não linearidade geométrica, fissuração do concreto e ligações semi-rígidas
Structural analysis of framed structures using discrete method, wherein, splitting them into elements with simplified considerations, can bring not satisfactory results or end up using very high safety coefficient to the structure. With the growth of computing and microcomputers it is feasible the resolution of structures considering all parts, therefore thr
Publicado em: 2007
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9. Segmentação fuzzy de imagens e vídeos
Image segmentation is the process of subdiving an image into constituent regions or objects that have similar features. In video segmentation, more than subdividing the frames in object that have similar features, there is a consistency requirement among segmentations of successive frames of the video. Fuzzy segmentation is a region growing technique that as
Publicado em: 2007
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10. Análise Não-Linear de Pórticos Tridimensionais Formados por Elementos Mistos de Aço e Concreto
The purpose of this dissertation is the development, implementation and test of numerical models for the Finite Element simulation of plain steel, reinforced concrete and composite steel-concrete three-dimensional frames. Physical (material) and geometrical nonlinearities are taken into account in the Finite Element formulation. At the cross section level, a
Publicado em: 2007
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11. OPTIMIZATION OF COLUMNS OF REINFORCED CONCRETETALL BUILDINGS / OTIMIZAÇÃO DE PILARES DE EDIFÍCIOS ALTOS DE CONCRETO ARMADO
This work proposes a formulation for the optimum design of columns of reinforced concrete tall buildings. The design variables are the dimensions of the cross-sections and the amount of longitudinal reinforcement in the columns and the concrete characteristic resistance. Aiming at reducing the size of this class of problem, the multilevel optimization techni
Publicado em: 2005
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12. SCENE TRACKING WITH AUTOMATIC CAMERA CALIBRATION / ACOMPANHAMENTO DE CENAS COM CALIBRAÇÃO AUTOMÁTICA DE CÂMERAS
In the television casting of sports events, it has become very common to insert synthetic elements to the images in real time, such as adds, marks on the field, etc. Usually, this insertion is made using special cameras, previously calibrated and provided with features that record their movements and parameter changes. With such information, inserting new ob
Publicado em: 2001