Structural Collapse
Mostrando 13-24 de 80 artigos, teses e dissertações.
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13. Non-linear FEM analysis of seismic induced pounding between neighbouring multi-storey structures
Pounding of neighbouring construction of structures due to seismic excitation increases the damage of structural components or even causes collapse of structures. Among the possible building damages, earthquake induced pounding has been commonly observed in several earthquakes. Therefore it is imperative to consider pounding effect for structures. This study
Lat. Am. j. solids struct.. Publicado em: 2013-09
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14. Different approaches to the Composition of Neutron Stars and their Environment / Diferentes abordagens à composição e ao ambiente das estrelas de nêutrons
Even after 80 years of intense research, the composition of neutron stars remains unknown, since both the dense matter in the interior of these compact objects and the matter moving around them are in extreme physical conditions, unreproducible in terrestrial laboratories. In this Thesis, we follow four different interconnected ways to approach these extreme
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2012
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15. Pilares de concreto armado em situação de incêndio submetidos à flexão normal composta. / Reinforced concrete columns in fire under uniaxial bending.
According to Brazilian Codes, reinforced concrete structures must be verified under high temperatures, in order to assure the load bearing capacity to allow the safe evacuation of the users and the fire fighting and to reduce the fire spread to other compartments. For reinforced concrete structures, the columns must be analyzed carefully. The significant red
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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16. Effect of Phytoaccumulation of Arsenic and Chromium on Structural and Ultrastructural Changes of Brake Fern (Pteris vittata)
Structural and ultrastructural changes caused by bioaccumulation of As and Cr in brake fern (Pteris vittata), a known arsenic hyperaccumulator, were investigated. Potted plants of brake fern were exposed to metal treatments of As and Cr for three weeks. Leaf, stem and root samples were collected periodically and fixed for LM (Light Microscopy), SEM (Scanning
Brazilian Journal of Plant Physiology. Publicado em: 2011
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17. Colapsibilidade com sucção controlada de um solo coluvionar e laterítico de Campinas/SP / Collapsibility with controlled suction of a colluvial and lateritic soil from Campinas/SP
This study aims at investigating the collapsibility of coluvionar and lateritic soil by oedometer tests with controlled suction, performed in the laboratory, and by the interpretation of the soilimpregnated thin plates before and after the tests, so as to take into account the differences between natural and "after collapse" structures. The undisturbed soil
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/05/2010
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18. Desenvolvimento de dobras e falhas em ambiente distensional: Aplicação da modelagem física
The geological modeling allows, at laboratory scaling, the simulation of the geometric and kinematic evolution of geological structures. The importance of the knowledge of these structures grows when we consider their role in the creation of traps or conduits to oil and water. In the present work we simulated the formation of folds and faults in extensional
Publicado em: 2010
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19. Influência de níveis de base nas características morfossedimentares das bacias dos rios das Velhas e Jequitaí (MG)
The Velhas and Jequitaí river basins have together an asymmetric shape that drain northward from Quadrilátero Ferrífero to the northern Minas Gerais State. These two basins are affluent of São Francisco river in its right margin. The headwaters of Velhas and Jequitaí rivers are dominated by quartzites ridges structured during the Brazilian orogenic cycl
Publicado em: 2010
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20. Coupled thermal and structural analysis of steel columns under fire condition / Análise termoestrutural de pilares de aço em situação de incêndio
The most part of materials whose constitute fire protection elements or structural elements, such as steel columns, when exposed to high temperature have their strength and elasticity modulus reduced caused by thermal action. Therefore the structure can collapse earlier than in an ambient temperature situation. Based in this aspect, the objective of the pres
Publicado em: 2009
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21. Arranjos institucionais e investimento em infra-estrutura no Brasil / Infrastructure investment in Brazil
This work follows the investment evolution in the infrastructure sector since the 60s. The investigated series are subjected to econometric tests proposed by Bai and Perron (1998, 2003b) that, ultimately, seek to identify possible structural breaks and try to link them to institutional changes. The follow segments were: road, rail, electric power and telecom
Publicado em: 2009
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22. Sistema Computacional para Análise Avançada Estática e Dinâmica de Estruturas Metálicas
A new computational tool for the advanced static and dynamic analysis of steel framed structures based on the Finite Element Method has been developed and is presented herein. Understanding the static and dynamic behavior of a structure is essential for designing structures that are lighter and slenderer without affecting their safety and quality standards.
Publicado em: 2009
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23. Extracellular matrix of the lateral pharyngeal wall in obstructive sleep apnea syndrome / Avaliação do papel da matriz extracelular na musculatura da parede lateral da faringe na fisiopatologia da síndrome da apnéia obstrutiva do sono
The lateral muscular pharyngeal wall appears to be the predominant structure involved in the collapse of the pharynx in obstructive sleep apnea (OSA). OSA patients and snorers have a narrower pharynx which is more susceptible to collapse and is associated with muscle thickening in the lateral pharyngeal wall, largely formed by superior pharyngeal constrictor
Publicado em: 2009
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24. 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