Reliability-based evaluation of design code provisions for circular concrete-filled steel columns


Autoria(s): BECK, Andre T.; OLIVEIRA, Walter L. A. de; NARDIM, Silvana De; ELDEBS, Ana L. H. C.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2009

Resumo

This paper presents an investigation of design code provisions for steel-concrete composite columns. The study covers the national building codes of United States, Canada and Brazil, and the transnational EUROCODE. The study is based on experimental results of 93 axially loaded concrete-filled tubular steel columns. This includes 36 unpublished, full scale experimental results by the authors and 57 results from the literature. The error of resistance models is determined by comparing experimental results for ultimate loads with code-predicted column resistances. Regression analysis is used to describe the variation of model error with column slenderness and to describe model uncertainty. The paper shows that Canadian and European codes are able to predict mean column resistance, since resistance models of these codes present detailed formulations for concrete confinement by a steel tube. ANSI/AISC and Brazilian codes have limited allowance for concrete confinement, and become very conservative for short columns. Reliability analysis is used to evaluate the safety level of code provisions. Reliability analysis includes model error and other random problem parameters like steel and concrete strengths, and dead and live loads. Design code provisions are evaluated in terms of sufficient and uniform reliability criteria. Results show that the four design codes studied provide uniform reliability, with the Canadian code being best in achieving this goal. This is a result of a well balanced code, both in terms of load combinations and resistance model. The European code is less successful in providing uniform reliability, a consequence of the partial factors used in load combinations. The paper also shows that reliability indexes of columns designed according to European code can be as low as 2.2, which is quite below target reliability levels of EUROCODE. (C) 2009 Elsevier Ltd. All rights reserved.

CNPq (National Council for Research and Development)

FAPESP (Sao Paulo State Foundation for Research)

Identificador

ENGINEERING STRUCTURES, v.31, n.10, p.2299-2308, 2009

0141-0296

http://producao.usp.br/handle/BDPI/17841

10.1016/j.engstruct.2009.05.004

http://dx.doi.org/10.1016/j.engstruct.2009.05.004

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

Relação

Engineering Structures

Direitos

restrictedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #Steel-concrete composites #Composite columns #Concrete-filled tube #Structural design code #Model error #Experimental analysis #Reliability analysis #TUBULAR COLUMNS #EXPERIMENTAL BEHAVIOR #TUBE COLUMNS #STRENGTH #Engineering, Civil
Tipo

article

original article

publishedVersion