Vol. 7, No. 2, pp. 144-156 (2011)
BEHAVIOR OF LIGHTWEIGHT AGGREGATE CONCRETE FILLED
STEEL TUBULAR SLENDER COLUMNS UNDER AXIAL COMPRESSION
Fu Zhong-qiu 1, Ji Bo-hai 2, *, Lv Lei 3 and Zhou Wen-jie 3
1 PhD Candidate, College of Civil and Transportation Engineering
Hohai University, Xikang Road 1#, Nanjing, Jiangsu, P.R. China 210098
2 Professor, College of Civil and Transportation Engineering
Hohai University, Xikang Road 1#, Nanjing, Jiangsu, P.R. China 210098
3 M.E., College of Civil and Transportation Engineering
Hohai University, Xikang Road 1#, Nanjing, Jiangsu, P.R. China 210098
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 11 July 2010; Revised: 28 September 2010; Accepted: 23 November 2010
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ABSTRACT
Based on axially compressive tests on 6 short columns and 27 slender columns of lightweight aggregate concrete filled steel tube (LACFST)，macroscopic deformation characters，axial force-longitudinal strain curves，failure mode and failure mechanism are studied. The results are also compared with these of the normal concrete filled steel tube. The test results demonstrated that slenderness ratio is the main influence factor to the behavior of LACFST long columns under axial load. The greater the slenderness ratio is, the lower the ultimate bearing capacity and stability coefficient of the specimen are, and the performances of core concrete affect the stability behavior of lightweight aggregate concrete and normal concrete filled steel tube long columns. The stability coefficient of specimens is determined by the peak strain of concrete and unrelated to the peak strength of concrete. The stability coefficient increases when the peak strain of concrete increasing. Comparison results show that calculation formula in Europe code EC4 (1996) can be applied to calculate the bearing capacity of LACFST columns under axially compressive load.
KEYWORDS
Lightweight aggregate concrete filled steel tube; axial compressed test; slenderness ratio; stability coefficient; bearing capacity
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