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The hybrid structural form made of the polyvinyl chloride (PVC) and lump-grout (LG) material, termed LGFPT column, was developed as the alternative standing support for deep underground mines. To explore the mechanical response of this structural form under the uniaxial compression, various critical parameters (i.e., the water-to-powder ratio of the cementitious grout material, length-to-diameter ratio of the PVC tube, loading mode and loading speed) were investigated. Test results showed that the LGFPT column had an excellent ductility (>30% of the column length) associated with the strain hardening behaviour. Compared to its counterparts, the effect of the water-to-powder ratio of the grout material is most significant when the peak load of the LGFPT is evaluated. In parallel, the compressive behaviour of the cementitious grout material-filled PVC tubular (GFPT) column was investigated. When the ultimate axial compressive strength of the LGFPT and the GFPT are compared, the streng ....
Abstract The combined use of a fiber-reinforced polymer (FRP) tube with steel and concrete to form hybrid structural members has attracted increasing research attention. Hybrid FRP-concrete-steel multitube concrete columns (MTCCs) are a new form of such members, comprising an external FRP tube and a number of internal steel tubes, with all the space inside the tubes filled with concrete. Hybrid MTCCs allow the use of small-scale standard steel tube products to construct large-scale columns, and these possess many advantages including excellent ductility, as demonstrated by recent studies. The existing studies on MTCCs, however, have been limited to the testing of small-scale specimens. For a new column form particularly suitable for large-scale construction, the potential size effect on the behavior of MTCCs needs to be clarified. This paper presents the first-ever experimental study on large-scale MTCCs through the testing of specimens with an outer diameter (for circular spe ....