STRUCTURAL BEHAVIOR OF TUBULAR SPATIAL TRUSSES / COMPORTAMIENTO DE EXTRUCTURAS ESPACIALES TUBULARES PADRONIZADAS / COMPORTAMENTO DE ESTRUTURAS ESPACIAIS TUBULARES PADRONIZADAS

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

This work presents an investigation of the structural behaviour of tubular space trusses composed of continuous end flattened members stacked above each other and joined together by a single bolt. One of the main motivations for this work comes from the fact that this structural solution is very commonly used in Brazil. The main reasons for that are the economy achieved in fabrication and the simplicity of erection associated with that structural solution. This solution also proves to be competitive when compared to other commercial systems. On the other hand, the structural design of these trusses are still subjected to some criticism since the loss of stiffness in the bars´ extremities is not taken into account. To enlighten this problem a full-scale experimental programme was performed in a 12m x 12m space structure. The adopted structure consisted of a diagonal on square mesh with top and bottom chord members of 2000mm and 1414mm and a 1500mm mesh height. The aim of the this programme was to investigate the ultimate compression resistance of the structural members taking into account the effect of the flattened ends and the type of connection used. The experiments ranged from tests where all the structural nodes used a single eccentric bolt to others where plated connectors were used in the supports to eliminate second- order moments. The experimental results demonstrated that the ultimate resistance of the structure with the eccentric connections only presented a small reduction when compared to other non-eccentric systems. The tests also confirmed that the flattened end of the members and the geometric characteristics of plated connectors are very significant parameters in the structure´s ultimate behaviour.

ASSUNTO(S)

estrutura de aco civil structures analisis experimental estruturas espaciais analise experimental space frames experimental analysis

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