Damage plasticity model for passively confined concrete

¹ Department of Disaster Mitigation for Structures, College of Civil Engineering, Tongji University, Shanghai 200092, China
² School of Architecture Engineering, Nanjing Institute of Technology, Nanjing 211167, China.

^* Corresponding author: jfjiang@tongji.edu.cn

Abstract

This paper presents a modified concrete damage plasticity model (CDPM) for passively confined concrete within the concrete damage plasticity theory frame in ABAQUS. The modified CDPM can be used to simulate concrete under non-uniform passive confinement, for example, Fiber-reinforced polymer (FRP)-confined square concrete columns. The modification of CDPM includes a flow rule and a strain hardening/softening criterion in which dilation angle and yield stress are important parameters. Based on the true-triaxial experiment results of passively confined concrete, the dilation angle and yield stress were determined considering different confinement stiffness and non-uniform confinement stiffness ratio. Finally, the modified CDPM were incorporated in the ABAQUS model. The prediction of the finite element model of FRP-confined square concrete columns shows good prediction accuracy.