Theoretical and experimental study of high strength concrete filled steel tubes / Estudo teórico-experimental de pilares mistos compostos por tubos de aço preenchidos com concreto de alta resistência.

AUTOR(ES)

Silvana De Nardin

DATA DE PUBLICAÇÃO

1999

RESUMO

The use of concrete filled steel tubes especially in tall buildings is a tendency in several european, american and asian countries. The use of these members has several advantages: high resistance and ductility, saving of materials and labour, reduction of cross section dimensions and improvement in behaviour of the materials steel and concrete due the confinement. The main purpose of this study is provide some experimental results of the behaviour of concrete filled steel tubes concentrically loaded. The main experimental parameters considered were the influence of the cross-section shape and thickness of steel tube. Square, circular and rectangular cross-section shapes infilling with concrete of the 50MPa of strength were analyzed. The failure was characterized for crushing of the concrete and later local buckling of the steel section in several points. The strength capacity predicted for several standards showed good agreement with the experimental failure values although this does not consider the confinement of the concrete. The results of tests showed that the confinement effect contributes for improvement behaviour of materials, especially increasing the ductility of the high strength concrete. However the results showed that the triaxial confinement does not increase the axial capacity of the concrete filled steel tubes. Some methods to estimate the ductility of axially compressed concrete columns were adapted and showed good results permitting the calculation of the ductility index of short columns.

ASSUNTO(S)

pilares mistos preenchidos concrete filled steel tubes tall buildings composite columns confinamento estruturas mistas ductility pilares mistos aço-concreto concreto de alta resistência ductilidade high strength concrete box columns

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