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http://dx.doi.org/10.12989/scs.2019.32.6.717

Behaviour of lightweight aggregate concrete-filled steel tube under horizontal cyclic load  

Fu, Zhongqiu (College of Civil and Transportation Engineering, Hohai University)
Ji, Bohai (College of Civil and Transportation Engineering, Hohai University)
Wu, Dongyang (College of Civil and Transportation Engineering, Hohai University)
Yu, Zhenpeng (College of Civil and Transportation Engineering, Hohai University)
Publication Information
Steel and Composite Structures / v.32, no.6, 2019 , pp. 717-729 More about this Journal
Abstract
A horizontal cyclic test was carried out to study the seismic performance of lightweight aggregate concrete filled steel tube (LACFST). The constitutive and hysteretic model of core lightweight aggregate concrete (LAC) was proposed for finite element simulation. The stress and strain changes of the steel tube and concrete filled inside were measured in the experiment, and the failure mode, hysteresis curve, skeleton curve, and strain curve of the test specimens were obtained. The influence of axial compression ratio, diameter-thickness ratio and material strength were analysed based on finite element model. The results show that the hysteresis curve of LACFST indicated favourable ductility, energy dissipation, and seismic performance. The LACFST failed when the concrete in the bottom first crushed and the steel tube then bulged, thus axial force imposed by prestressing was proved to be feasible. The proposed constitutive model and hysteretic model of LAC under the constraint of its steel tube was reliable. The bearing capacity and ductility of the specimen increase significantly with increasing thickness of the steel tube. The bearing capacity of the member improves while the ductility and energy dissipation performance slightly decreased with the increasing strength of the steel and concrete.
Keywords
lightweight aggregate concrete filled steel tube; horizontal cyclic test; hysteretic behaviour; concrete constitutive model;
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