Issue 46

W. Hao et alii, Frattura ed Integrità Strutturale, 46 (2018) 391-399; DOI: 10.3221/IGF-ESIS.46.36 391 Experimental study on the mechanical behavior of RPC filled square steel tube columns subjected to eccentric compression Wenxiu Hao*, Xiao Xu, Zhiqiang Niu Hebei Agricultural University, Baoding 071001, China * hwxansys@126.com A BSTRACT . In order to study the mechanical behavior of reactive powder concrete (RPC) filled square steel tubular columns, this paper designs an eccentric compression experiment for 12 specimens of RPC filled square steel tubular columns and studies the effects of failure form, load-displacement curve, slenderness ratio, steel ratio and eccentricity ratio of an eccentrically loaded columns on its mechanical behavior. At the same time, it also compares the experiment results with the bearing capacity calculated with relevant specifications and uses Abaqus to carry out numerical simulation of eccentrically loaded columns. The results show that, the failure form of the eccentrically loaded RPC filled square steel tubular column shows local buckling failure. Before the ultimate load is reached, there is no significant change on the surface of the specimen, and the yield stage of the load- displacement curve is not obvious, either. The results of the bearing capacity calculation formula recommended in CECS28-2012 are close to the experiment results and relatively conservative, so it is more applicable to the bearing capacity design of eccentrically loaded RPC filled square steel tubular columns. The results of the numerical simulation analysis are in good agreement with the experimental results, which can provide theoretical support for engineering practice. K EYWORDS . Square steel tube; Reactive powder concrete; Column; Eccentric compression; Mechanical behavior. Citation: Hao, W., Xu, X., Niu, Z., N., Experimental study on the mechanical behavior of RPC filled square steel tube columns subjected to eccentric compression, Frattura ed Integrità Strutturale, 46 (2018) 391-399. Received: 31.07.2018 Accepted: 17.09.2018 Published: 01.10.2018 Copyright: © 2018 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he concrete filled square steel tubular structure has advantages such as simple structure, convenient connection, high bearing capacity and good seismic performance, making it widely used in industrial premises, high-rise buildings, bridges and other structures. The building space is often limited, but it can be well utilized if the slenderness ratios of the columns are large, which requires the concrete-filled steel tubular columns to have not only high bearing capacity, but also strong lateral stiffness. To achieve these two requirements, we not only have to increase the steel T