Seismic Performance of Recycled Concrete Filled Circular Steel Tube Columns

Dingyi Xu,Zongping Chen,Chunheng Zhou

doi:10.3389/fmats.2020.612059

Abstract

This study was conducted to experimentally investigate the behavior of recycled concrete-filled circular steel tube (RCFST) columns subjected to cyclic loading. Ten specimens were prepared and tested. Four parameters were used to characterize seismic behavior: the replacement percentage of recycled coarse aggregate, slenderness ratio, axial compression level, and steel ratio. A novel calculation method for the bearing capacity for RCFST columns is established. The failure processes and modes of RCFST columns are found to be similar to normal concrete-filled steel tube columns. Varying the replacement percentage of recycled coarse aggregate has little effect on the hysteresis curves of the RCFST columns. The RCFST columns also show seismic performance similar to that of concrete-filled steel tubes. The displacement ductility of all specimens is larger than 3.0 and the equivalent viscous damping coefficients corresponding to the ultimate load range from 0.305 to 0.460.

Highlights

The rapid and extensive development of construction projects across the globe accompanying urbanization and modern economic advancement has resulted in massive amounts of waste
The recycled coarse aggregate (RCA) replacement percentage, slenderness ratio, axial compression level, and steel ratio were tested in 10 circular recycled concretefilled circular steel tube (RCFST) columns to investigate the effects of these four parameters on seismic performance
A seismic performance test and bending bearing capacity calculation were performed in this study to analyze 10 circular RCFST columns with various design parameters

Summary

INTRODUCTION

The rapid and extensive development of construction projects across the globe accompanying urbanization and modern economic advancement has resulted in massive amounts of waste. Other studies have provided valuable information regarding the effects of eccentric loading performance (Yang and Han, 2006b), long-term sustained loading behavior (Yang and Han, 2006a; Yang et al, 2008; Yang, 2011; Geng et al, 2015), and design calculations (Yang and Hou, 2015) in RCFST and CFST columns. There has been one previous investigation targeting the seismic performance of circular RCFST columns with different concrete types and axial load levels. As the key factors, the effects of RCA replacement percentage, slenderness ratio, or steel ratio on the seismic behavior of RCFST columns were worthy of further study. The RCA replacement percentage, slenderness ratio, axial compression level, and steel ratio were tested in 10 circular RCFST columns to investigate the effects of these four parameters on seismic performance.

RESULTS AND DISCUSSION

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CONCLUSION

DATA AVAILABILITY STATEMENT