Abstract
In this study, a novel form of tubular columns that is made of ultra-high-performance concrete (UHPC) internally reinforced with fiber-reinforced polymer (FRP) grid (herein referred to as FRP grid-UHPC tubular column) was developed. The axial compression test results of FRP grid-UHPC tubular columns with and without in-filled concrete are presented and discussed. Effects of the number of the FRP grid-reinforcing cages, the presence of in-filled concrete, and the presence of external FRP confinement were investigated. The test results confirmed that the FRP-UHPC tubular columns have a satisfactory compressive strength, and the strength and ductility of FRP-confined concrete-filled FRP grid-UHPC tube columns are enhanced due to the confinement from the FRP wrap. The proposed FRP grid-reinforced UHPC composite tubes are attractive in structural applications as pipelines or permanent formworks for columns, as well as external jackets (can be prefabricated in the form of two halves of tubes) for strengthening deteriorated reinforced concrete columns.
Highlights
Ultra-high-performance concrete (UHPC) has recently attracted increasing attention for structural applications [1,2,3,4,5,6,7,8,9,10]
Chen et al [28] conducted studies on the compressive behavior of concrete columns jacketed with basalt fiber textile-reinforced engineered cementitious composites (ECC) and found that the strength and ductility of the test columns were superior to those of columns confined with textile-reinforced plain mortar
The above existing studies on the compressive behavior of reinforced concrete (RC) columns jacketed with high-performance cementitious materials revealed that the load-carrying capacity of RC columns can be enhanced by the high-performance cementitious materials, while such strengthening technique led to little improvement of the column ductility due to Polymers 2022, 13, x FOR PEER REVIEWthe weak deformation capacity of the strengthening layer
Summary
Ultra-high-performance concrete (UHPC) has recently attracted increasing attention for structural applications [1,2,3,4,5,6,7,8,9,10]. Due to the excellent mechanical properties, UHPC with or without internal steel reinforcement has been used for strengthening existing reinforced concrete (RC) structures in the form of permanent formworks or jacketing materials (Figure 1). The above existing studies on the compressive behavior of RC columns jacketed with high-performance cementitious materials revealed that the load-carrying capacity of RC columns can be enhanced by the high-performance cementitious materials, while such strengthening technique led to little improvement of the column ductility due to Polymers 2022, 13, x FOR PEER REVIEWthe weak deformation capacity of the strengthening layer It is expected th3atomf 2o1re effective internal reinforcement should be included in the UHPC jacket for improvement of its deformation capacity. 30 column specimens were prepared, and the effects of the number of the FRP grid-reinforcing cages, the position of the FRP grid reinforcement, the presence of in-filled concrete, and the presence of external FRP confinement (Figure 1c) on the compressive behavior of the columns were investigated. For concrete-filled FRP gridUHPC tube columns, the ready FRP-UHPC tubes were subsequently filled with ready-mix commercial concrete provided by a local supplier
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