Earthquakes and Structures

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Seismic analysis of RC tubular columns in air-cooled supporting structure of TPP

  • Wang, Bo (School of Civil Engineering, Chang'an University) ;
  • Yang, Ke (School of Civil Engineering, Chang'an University) ;
  • Dai, Huijuan (School of Civil Engineering, Xi'an University of Science and Technology) ;
  • Bai, Guoliang (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Qin, Chaogang (School of Civil Engineering, Chang'an University)
  • Received : 2019.12.24
  • Accepted : 2020.04.21
  • Published : 2020.05.25
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Abstract

This paper aims to investigate the seismic behavior and influence parameters of the large-scaled thin-walled reinforced concrete (RC) tubular columns in air-cooled supporting structures of thermal power plants (TPPs). Cyclic loading tests and finite element analysis were performed on 1/8-scaled specimens considering the influence of wall diameter ratio, axial compression ratio, longitudinal reinforcement ratio, stirrup reinforcement ratio and adding steel diagonal braces (SDBs). The research results showed that the cracks mainly occurred on the lower half part of RC tubular columns during the cyclic loading test; the specimen with the minimum wall diameter ratio presented the earlier cracking and had the most cracks; the failure mode of RC tubular columns was large bias compression failure; increasing the axial compression ratio could increase the lateral bearing capacity and energy dissipation capacity, but also weaken the ductility and aggravate the lateral stiffness deterioration; increasing the longitudinal reinforcement ratio could efficiently enhance the seismic behavior; increasing the stirrup reinforcement ratio was favorable to the ductility; RC tubular columns with SDBs had a much higher bearing capacity and lateral stiffness than those without SDBs, and with the decrease of the angle between columns and SDBs, both bearing capacity and lateral stiffness increased significantly.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (NSFC, Grant No. 51708037 and 51978076), the Natural Science Foundation of Shaanxi Province (Grant No. 2019JQ-193) and the Fundamental Research Funds for the Central Universities, CHD (Grant No. 300102280202). In addition, special thanks to chief engineer Dr. Hongxing Li from Northwest Electronic Power Design Institute for helpful and valuable discussions on the experimental analysis

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