Experimental behaviour of partially loaded concrete filled double-skin steel tube (CFDST) sections.pdf

Journal of Constructional Steel Research 71 (2012) 63–73 Contents lists available at SciVerse ScienceDirect Journal of Constructional Steel ResearchExperimental behaviour of partially loaded concrete filled double-skin steel tube (CFDST) sections You-Fu Yang a, Lin-Hai Han b,?, Ben-Hao Sun a a School of Civil Engineering, Dalian University of Technology, Dalian, 116024, PR China b Department of Civil Engineering, Tsinghua University, Beijing, 100084, PR China? Corresponding author. Tel.: +86 10 fax: E-mail address: lhhan@tsinghua.edu.cn (L.-H. Han). 0143-974X/$ – see front matter ? 2011 Elsevier Ltd. Al doi:10.1016/j.jcsr.2011.11.005a b s t r a c ta r t i c l e i n f oArticle history: Received 18 June 2011 Accepted 5 November 2011 Available online 15 December 2011 Keywords: Concrete filled double-skin steel tube (CFDST) Concrete filled steel tube (CFST) Double-skin Partial compression Composite column Hollow section Bearing capacityThe experimental behaviour of concrete filled double-skin steel tube (CFDST) sections subjected to partial compression is reported in this paper. Fourteen specimens with outer and inner steel tubes of circular hollow section (CHS) and fifteen specimens with outer and inner steel tubes of square hollow section (SHS) were tested. The test parameters included: 1) hollow ratio, 2) top endplate thickness, and 3) partial compression area ratio. The test results indicated that the CFDST columns under partial compression behaved in a ductile manner. The partial compressive behaviour and the failure modes of partially loaded CFDST stub columns were significantly affected by the parameters investigated. Finally, a simplified model for predicting the bearing capacity of partially loaded CFDST sections is proposed. ? 2011 Elsevier Ltd. All rights reserved.1. Introduction The advantages of concrete filled double-skin steel tube (CFDST) column over traditional concrete filled steel tube (CFST) column have been introduced in Han et al. (2004)