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Steel and Composite Structures
  Volume 17, Number 4, October 2014 , pages 371-386

Restoring force model for circular RC columns strengthened by pre-stressed CFRP strips
Changdong Zhou, Xilin Lu, Hui Li and Teng Tian

    This paper presents a tri-linear restoring force model based on the test results of 12 circular RC columns strengthened by CFRP strips under low cyclic loading. The pre-stress of CFRP strips and axial load ratio of specimens are considered as the affect parameters of the proposed model. All essential characteristics of the hysteretic behavior of the proposed model, including the hysteretic rules, main performance points, strength degradation, stiffness degradation and confinement effects are explicitly analyzed. The calculated results from the proposed model are in good agreement with the experimental results, which shows that the recommended model can be reliably used for seismic behavior predictions of circular RC columns strengthened by pre-stressed CFRP strips.
Key Words
    restoring force model; circular reinforced concrete column; pre-stressed fiber reinforced polymer; seismic behavior; active confinement
(1) Changdong Zhou, Hui Li, Teng Tian:
School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China;
(2) Xilin Lu:
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China.

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