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

AUTOR(ES)

FÃbio Andrà Frutuoso Lopes

DATA DE PUBLICAÇÃO

2003

RESUMO

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 behavior was admitted for the slabs and their flexural stiffness was taken into account through the composite beams modeled, as well as the columns, with beam elements. The design of the steel members was done in accordance to Brazilian Code NBR 8800. The resultas obtained in ultimate stages for the loading studied (dead load, live load, drift angle and wind) allowed to observe the efficiency of the passing trusses in the decrease of displacements and bending moments and made it possible to understand the importance of the belt trusses placed on the levels where the outriggers were located. It is presented, also, a comparison between the results from the 3-d analyses with simplified plane methods available in literature. One can conclude that the bracing system studied showed good behavior regarding the displacements limits and the human comfort demanded by Brazilian Codes. The belt trusses, besides providing decrease in axial forces of high demanded steel columns, characterize the system of main vertical braced in the secondary direction. It was verified in the comparisons performed that bending moments from 3-d analyses showed lesser differences than the horizontal displacements of the building, when compared to those from simplified methods.

ASSUNTO(S)

edifÃcios altos composite bracing contraventamento misto human comfort outriggers tall building conforto humano outriggers engenharia civil

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