Techno Press

Steel and Composite Structures   Volume 19, Number 4, October 2015, pages 811-827
Reliability-based assessment of American and European specifications for square CFT stub columns
Zhao-Hui Lu, Yan-Gang Zhao, Zhi-Wu Yu and Cheng Chen

Abstract     [Full Text]
    This paper presents a probabilistic investigation of American and European specifications (i.e., AISC and Eurocode 4) for square concrete-filled steel tubular (CFT) stub columns. The study is based on experimental results of 100 axially loaded square CFT stub columns from the literature. By comparing experimental results for ultimate loads with code-predicted column resistances, the uncertainty of resistance models is analyzed and it is found that the modeling uncertainty parameter can be described using random variables of lognormal distribution. Reliability analyses were then performed with/without considering the modeling uncertainty parameter and the safety level of the specifications is evaluated in terms of sufficient and uniform reliability criteria. Results show that: (1) The AISC design code provided slightly conservative results of square CFT stub columns with reliability indices larger than 3.25 and the uniformness of reliability indices is no better because of the quality of the resistance model; (2) The uniformness of reliability indices for the Eurocode 4 was better than that of AISC, but the reliability indices of columns designed following the Eurocode 4 were found to be quite below the target reliability level of Eurocode 4.
Key Words
    composites column; concrete; steel; square tubes; specifications; modeling uncertainty parameter; reliability analys
(1) Zhao-Hui Lu, Yan-Gang Zhao, Zhi-Wu Yu:
National Engineering Laboratory for High Speed Railway Construction, School of Civil Engineering, Central South University, Changsha 410075, China;
(2) Yan-Gang Zhao:
Department of Architecture and Building Engineering, Kanagawa University, Yokohama 221-8686, Japan;
(3) Cheng Chen:
Department of Civil Engineering, San Francisco State University, San Francisco 94132, USA.

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