Frontiers of Structural and Civil Engineering
>> 2019,
Volume 13,
Issue 6
doi:
10.1007/s11709-019-0557-z
RESEARCH ARTICLE
Truss-arch model for shear strength of seismic-damaged SRC frame columns strengthened with CFRP sheets
. Department of Civil Engineering, Wuhan University of Science and Technology, Wuhan 430065, China.. School of Architectural Enginieering, Weifang University of Science and Technology, Weifang 262700, China
Accepted: 2019-09-11
Available online: 2019-09-11
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Abstract
Carbon fiber reinforced polymer (CFRP) materials are important reinforcing substances which are widely used in the shear strengthening of seismic-damage steel reinforced concrete (SRC) frame structures. To investigate the shear strength of SRC frame columns strengthened with CFRP sheets, experimental observations on eight seismic-damaged SRC frame columns strengthened with CFRP sheets were conducted at Yangtze University and existing experimental data of 49 SRC columns are presented. Based on the existing experiments, the theories of damage degree, zoning analysis of concrete, and strengthening material of the column are adopted. To present the expression formula of the shear strength of SRC frame columns strengthened with CFRP sheets, the contributions of strengthening material and transverse reinforcement to shear strength in the truss model are considered, based on the truss-arch model. The contribution of arch action is also considered through the analysis of the whole concrete and that of the three zones of the concrete are also considered. The formula is verified, and the calculated results are found to match well with the experimental results. Results indicate that the proposed whole analysis model can improve the accuracy of shear strength predictions of shear seismic-damaged SRC frame columns reinforced with CFRP sheets.
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