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The labels, “Local Mechanism” indicate locations of local buckling of the axially compressed cylindrical shell.
This and the next image are from:
A.P.C. Duarte (1), B.A. Silva (2), N. Silvestre (1), J. de Brito (2), E. Julio (2) and J.M. Castro (3)
(1) IDMEC, LAETA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
(2) CEris/ICIST, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
(3) CONSTRUCT, Department of Civil Engineering, Faculty of Engineering (FEUP), University of Porto, Rua Doutor Roberto Frias, 4200-465 Porto, Portugal
“Tests and design of short steel tubes filled with rubberized concrete”, Engineering Structures, Vol. 112, pp 274-286, April 2016, https://doi.org/10.1016/j.engstruct.2016.01.018
ABSTRACT: An experimental investigation on the strength and ductility of short steel tubes filled with rubberised concrete (RuC), sourced from recycled scrap tyres, is presented in this paper. Firstly, a brief literature review on (i) concrete-filled steel tubes (CFST) and (ii) mechanical characterisation of rubberised concrete is presented. Then, the experimental investigation is described and test results are shown and discussed, namely, the assessment of (i) RuC and steel mechanical properties and (ii) RuCFST column structural properties. The influence of various parameters, such as the cross-section shape (square, rectangular, circular), steel grade, and concrete mix (standard concrete versus RuC), on the short column strength and ductility is analysed and discussed. Eurocode 4 is considered (i) to determine the strength of the tested columns and, in particular, (ii) to assess its applicability to RuCFST columns based on a comparison with the experimental results. The main conclusion of this research is that RuCFST short columns present higher ductility than those made of standard concrete, even though they also show lower strength. This improved ductility is noticeable in columns with circular sections, rather than in square and rectangular sections. From a practical viewpoint, this could be a major benefit for structures in seismic areas where energy dissipation is needed.
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