Earthquakes and Structures

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Seismic damage evaluation of steel reinforced recycled concrete filled circular steel tube composite columns

  • Hui, Ma (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology) ;
  • Xiyang, Liu (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Yunchong, Chen (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Yanli, Zhao (Research and Design Institute of Water Conservancy and Hydropower, Xi'an University of Technology)
  • Received : 2021.12.27
  • Accepted : 2022.11.08
  • Published : 2022.11.25
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Abstract

To investigate and evaluate the seismic damage behaviors of steel reinforced recycled concrete (SRRC) filled circular steel tube composite columns, in this study, the cyclic loading tests of 11 composite columns was carried out by using the load-displacement joint control method. The seismic damage process, hysteretic curves and performance indexes of composite columns were observed and obtained. The effects of replacement rates of recycled coarse aggregate (RCA), diameter thickness ratio, axial compression ratio, profile steel ratio and section form of profile steel on the seismic damage behaviors of composite columns were also analyzed in detail. The results show that the failure model of columns is a typical bending failure under the combined action of horizontal loads and vertical loads, and the columns have good energy dissipation capacity and ductility. In addition, the replacement rates of RCA have a certain adverse effect on the seismic bearing capacity, energy consumption and ductility of columns. The seismic damage characteristics of composite columns are revealed according to the failure modes and hysteretic curves. A modified Park-Ang seismic damage model based on the maximum displacement and cumulative energy consumption was proposed, which can consider the adverse effect of RAC on the seismic damage of columns. On this basis, the performance levels of composite columns are divided into five categories, The interlayer displacement angle and damage index are used as the damage quantitative indicators of composite columns, and the displacement angle limits of composite columns at different performance levels under 80% assurance rate are calculated as 1/105, 1/85, 1/65, 1/28, and 1/25 respectively. On this basis, the damage index limits corresponding to each performance level are calculated as 0.045, 0.1, 0.48, 0.8, and 1.0 respectively. Finally, the corresponding relations among the performance levels, damage degrees, interlayer displacement angles and damage indexes of composite columns are established. The conclusions can provide reference for the seismic design of SRRC filled circular steel tube composite columns, it fills the vacancy in the research on seismic damage of steel reinforced recycled concrete (SRRC) filled circular steel tube composite columns.

Keywords

Acknowledgement

The financial support of this work came from the project of National Natural Science Foundation of China (No. 51408485), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2022JM-258 and 2021JM-332), and thanks a lot for the financial support of the above institutions.

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