Abstract
As a new low-carbon material, development of preplaced aggregate concrete (PAC) will achieve huge economic and social benefits. However, few existing research is focused on applying PAC in structural elements. This paper is attempt to apply PAC in concrete-filled steel tube (CFST) stub columns and the bearing behaviors of PAC-filled steel tube (PACFST) stub columns under axial compression are also experimentally investigated. The results indicate that the failure modes of PACFST stub columns are all drum-like failure mode which are analogous to that of CFST stub columns. The axial load-axial strain curves of PACFST stub columns can be roughly divided into elastic stage, elastic-plastic stage and plastic stage. Under the similar ultimate load, the ultimate strains are a bit smaller than that of CFST stub columns. Comparison of the results of ultimate load of PACFST stub columns calculated using the existing relevant standards for the bearing capacity calculation methods of CFST stub columns, GB 50936 and JGJ 138 are much more suitable to assess the bearing capacity of PACFST stub columns. Approximately 15%~20% saving in cement consumption will be accomplished with popularization and utilization of PACFST stub columns as compared with CFST stub columns.
Highlights
Concrete-filled steel tube (CFST) structures with virtues of higher bearing capacity [1], greater ductility property [2,3,4], easier construction [5], better seismic performance [6,7] and much more excellent fire-resistant performance [8,9] are widely utilized in high-rise buildings, industrial plants, bridges and underground structures [10,11,12,13,14] recently
The axial load-axial strain curves of PAC-filled steel tube (PACFST) stub columns could be roughly divided into three stages which were analogous to that of CFST stub columns
(3) Compared the bearing capacity calculation results of PACFST stub columns calculated by existing relevant standards, the results calculated by GB 50936 and JGJ 138 coincided well with the experimental results
Summary
Concrete-filled steel tube (CFST) structures with virtues of higher bearing capacity [1], greater ductility property [2,3,4], easier construction [5], better seismic performance [6,7] and much more excellent fire-resistant performance [8,9] are widely utilized in high-rise buildings, industrial plants, bridges and underground structures [10,11,12,13,14] recently. Combined with the characteristic of PAC, using PAC to replace NC in preparation of CFST structural members may be benefit to reduce the consumption of cement in core concrete and will achieve a number of economic and social benefits. On the basis of the experimental results of ultimate bearing capacities of PACFST stub columns under axial compression, compared with the prediction results calculated by existing design codes for CFST stub columns, the bearing capacity calculation methods of PACFST stub columns are suggested
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