Abstract
To obtain the seismic behavior of glass fiber–reinforced polymer (GFRP) tube reactive powder concrete composite columns with encased steel (GRS), a total of 17 full-scale GRS columns were designed in this study. The parametric studies were conducted to explore the influence of factors such as the diameter of GFRP tube (D), thickness of GFRP tube (t), number of fiber winding layers (n), fiber winding angle (θ), axial compression ratio (λ), compressive strength of reactive powder concrete (fc), the area of encased steel (As), and strength of encased steel (fsy) on the seismic behavior of the composite columns. The finite element models of this kind of columns were established by ABAQUS finite element software, and the seismic behavior analysis for GRS composite columns was carried out. The results show that all the specimens exhibit good ductility and strong deformation ability. The stiffness degradation of specimens significantly slows down with the increase of D, fsy, and λ. The energy dissipation capacity of specimens can be improved by increasing D and λ, while the increase of As and fsy leads to the decrease of the energy dissipation capacity. By observing the failure mode of such composite columns, local bulging occurs in the foot area of the columns. Based on the statistical analysis of the calculated results, the restoring force models for GRS composite columns are proposed, which agree well with the simulated results. The restoring force models can provide reference for the elastic-plastic seismic response analysis of this kind of composite columns.
Highlights
The development of civil engineering depends largely on the development and application of novel structures composed of new materials and new components with excellent performance
The results showed that the bearing capacity of reactive powder concrete (RPC) columns increased with the increase of the axial compression ratio, longitudinal reinforcement ratio, and stirrup ratio, but the ductility of RPC columns decreased with the increase of the axial compression ratio (Ju et al, 2013)
In order to study the seismic behavior of glass fiber–reinforced polymer (GFRP) tube reactive powder concrete composite columns with encased steel (GRS), the numerical simulation analysis of GRS composite columns under low cyclic loading was carried out by ABAQUS finite element software
Summary
The development of civil engineering depends largely on the development and application of novel structures composed of new materials and new components with excellent performance. Based on the above advantages, a new type of columns composed of GFRP, RPC, and encased steel is proposed in this study, namely, GFRP tube reactive powder concrete. Eight reinforced concrete columns strengthened with FRP were designed by Shan et al, and the residual performance of FRP-retrofitted columns damaged after simulated seismic loading was studied. The quasi-static tests of 18 RPC columns were carried out by Ju et al, and the influence of axial compression ratio, longitudinal reinforcement ratio, stirrup ratio, and steel fiber volume content on the seismic behavior of RPC columns were studied. In accordance with the results of previous studies, the seismic behavior of the composite columns is related to some main factors, such as the diameter and thickness of GFRP tube, number and angle of fiber winding layers, axial compression ratio, compressive strength of reactive powder concrete, and the area and strength of encased steel. It is reasonable and feasible to carry out the study on seismic behavior of GRS columns based on the above modeling method
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