Lateral response of HPC confined by both spiral stirrups and CFRP under axial compression

摘要

Lateral response is the lateral expansion deformation of confined concrete under axial compression which is used as an indicator to evaluate the lateral confinements of confining materials. In this paper, an axial compression test including twenty-four HPC specimens consisting 12 HPC columns confined by both CFRP and spiral stirrups and 12 HPC columns confined by spiral stirrups with compression strength up to 120.92 MPa was carried out. The axial stress-lateral strain curves and lateral strain-axial strain curves of specimens were evaluated and the lateral strain developments of CFRP and spiral stirrups were estimated. The models for predicting the lateral strain-axial strain curves of HPC confined by both CFRP and stirrups were established with good agreements with experimental results. In addition, the lateral strain in CFRP and spiral stirrups corresponding to peak stress were predicted. Based on the lateral strain prediction models, the peak stress and peak strain of HPC confined by CFRP and spiral stirrups were predicted with high accuracy in predicting experimental results.