Wind Load
Mostrando 37-46 de 46 artigos, teses e dissertações.
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37. Influência das vibrações do cabo na instabilidade aeroelástica de uma viga simples estaiada. / Influence of cable vibrations on the aero-elastic instability of a cable-stayed beam.
This paper is concerned with determining wind critical velocities and post-critical vibration amplitudes in a cable-stayed beam, under wind-rain condition. It is considered the cable sag due to the dead load plus the non-linear coupling between the vibration of both the cable and the beam. Three modes are of special interest, namely the first global mode (be
Publicado em: 2005
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38. Modelagem do balanço de energia do dossel da cultura do pimentão em casa de vegetação. / Canopy energy balance modeling of sweet pepper cultivated in greenhouse.
In a greenhouse production system, the canopy of culture is the main element that modifies the internal microclimate. Its comprehension is very important to understand the energy exchange process. Due to the complexity interaction among several elements, the modeling represents an important tool for research in protected environments, but little used in Braz
Publicado em: 2005
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39. Control Strategies for Wind Turbines with Induction Generators / EstratÃgias de controle de sistemas de garaÃÃo eÃlica com mÃquinas de induÃÃo
The perspectives of a great number of accesses of wind turbines to the Brazilian electrical system have stimulated studies on the controls of these generators and the impacts that they will cause in the electrical grid. This two stages work, considered the study of control techniques of induction generators with squirrel cage type or doubly fed, when set in
Publicado em: 2003
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40. Three-dimensional analyses of a mixed bracing system used in tal buildings / AnÃlise tridimensional de um sistema de contraventamento misto aplicado em edifÃcios altos / Three-dimensional analyses of a mixed bracing system used in tal buildings / AnÃlise tridimensional de um sistema de contraventamento misto aplicado em edifÃcios altos
The objective of this work is to analyze a mixed bracing system formed by passing trusses (outriggers) rigidly connected to stiff columns. It was performed three-dimensional analyses in a fifty storey building with high strength steel columns made with high resistence steel (AR-345) in periphery and reinforced concrete stiff columns in the core. A diaphragm
Publicado em: 2003
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41. Modelagem de pilares paredes em edifÃcios
Slender sky-scraper constructions require pondering prior analysis features like global and localized geometrical imperfection, physical and geometrical non-linearity aspects, adequate modeling of structural elements with respect to shear-wall elements, etc. In this work, the shear-wall behavior of an actual building is studied, upon which columns were model
Publicado em: 2002
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42. Construção, calibração e análise de funcionamento de lisímetros de pesagem para determinação da evapotranspiração da cultura da lima ácida Tahiti (Citrus latifolia Tan.). / Construction, calibration and analysis of the operation of a weighing lysimeter to determine the evapotranspiration of "tahiti" lime (citrus latifolia tan.).
This study had as main objectives a) the construction, calibration and operation of load cell based weighing lysimeters to measure the water consumption of orchard trees in situ; b) the evapotranspiration measurement at the first stages after plantation of a "Tahiti" lime (Citrus latifolia Tan.) orchard; and c) the crop coefficient (Kc) determination for the
Publicado em: 2002
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43. InteraÃÃo entre fatores climÃticos e um recinto localizado na cidade de recife: estudo teÃrico-experimental
Ambient temperatures lying between medium and high values, combined with small thermal amplitude, high values of relative humidity and solar radiation make the city of Recife a region that can be considered as having scarce possibilities for the use of passive or low energy consumption methods for providing thermal comfort conditions in local residences. Tak
Publicado em: 2002
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44. Determinação da rigidez e amortecimento equivalente proveniente do fluido escoando e interagindo com placas flexiveis : teoria e constatações experimentais
The understanding and modelling of the stiffness and the damping behavior of structures when subjected to a flow field, is still a very complex problem, dealing with the interaction of two major fields of mechanical sciences. The classical theory of elasticity deals with strains of flexible bodies under predefined external loads. Generally, the external load
Publicado em: 2001
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45. INESTABILIDAD DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILIDADE DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILITY OF SEGMENTAL REINFORCED CONCRETE ARCHS
Segmental arch is a structure made of several straight segments of precast concrete connected at points belonging to a curve in the form of an arch which circumscribes the structure. This type of arch has some advantages for the precasting industry: a) it allows the use of the same forms used to cast other types of straight pieces such as beams and columns;
Publicado em: 1997
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46. Potential Health Hazards from Microbial Aerosols in Densely Populated Urban Regions
Aerosolized bacteria were recovered up to 930 m downwind of three sewage treatment plants in Jefferson County, Ky. This distance includes homes in the proximity of several hundred such plants in that county. Bacterial counts were elevated on foliage near activated sludge tanks; although these counts decreased rapidly, at 48 h after exposure they were signifi