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Numerical analysis and horizontal bearing capacity of steel reinforced recycled concrete columns

  • Ma, Hui (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Xue, Jianyang (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Liu, Yunhe (School of Civil Engineering and Architecture, Xi'an University of Technology) ;
  • Dong, Jing (School of Civil Engineering and Architecture, Xi'an University of Technology)
  • Received : 2016.06.16
  • Accepted : 2016.10.30
  • Published : 2016.11.20

Abstract

This paper simulates the hysteretic behavior of steel reinforced recycled concrete (SRRC) columns under cyclic loads using OpenSees software. The effective fiber model and displacement-based beam-column element in OpenSees is applied to each SRRC columns. The Concrete01 material model for recycled aggregate concrete (RAC) and Steel02 material model is proposed to perform the numerical simulation of columns. The constitutive models of RAC, profile steel and rebars in columns were assigned to each fiber element. Based on the modelling method, the analytical models of SRRC columns are established. It shows that the calculated hysteresis loops of most SRRC columns agree well with the test curves. In addition, the parameter studies (i.e., strength grade of RAC, stirrups strength, steel strength and steel ratio) on seismic performance of SRRC columns were also investigated in detail by OpenSees. The calculation results of parameter analysis show that SRRC columns suffered from flexural failure has good seismic performance through the reasonable design. The ductility and bearing capacity of columns increases as the increasing magnitude of steel strength, steel ratio and stirrups strength. Although the bearing capacity of columns increases as the strength grade of RAC increases, the ductility and energy dissipation capacity decreases gradually. Based on the test and numerical results, the flexural failure mechanism of SRRC columns were analysed in detail. The computing theories of the normal section of bearing capacity for the eccentrically loaded columns were adopted to calculate the nominal bending strength of SRRC columns subjected to vertical axial force under lateral cyclic loads. The calculation formulas of horizontal bearing capacity for SRRC columns were proposed based on their nominal bending strength.

Acknowledgement

Supported by : National Natural Science Foundation of China, China Postdoctoral Science Foundation, Ministry of Housing and Urban-rural Development of China, Young Talent Fund of University Association for Science and Technology in Shaanxi of China

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