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Retrofitting Seismically Damaged Steel sections encased Concrete Composite Walls using Externally Bonded CFRP Strips

Sun, F-J., Pang, S-H., Zhang, Z-W., Fu, F. ORCID: 0000-0002-9176-8159 and Qian, K. (2020). Retrofitting Seismically Damaged Steel sections encased Concrete Composite Walls using Externally Bonded CFRP Strips. Composite Structures, 236, 111927.. doi: 10.1016/j.compstruct.2020.111927

Abstract

Concrete shear wall encased with steel sections were widely used in high rise buildings due to its high lateral strength, ductility and energy dissipation capacity. However, to date, little studies were conducted on repairment of seismically damaged steel-concrete composite (SCC) walls to recover their lateral load resisting capacity. Thus, the efficiency of Carbon Fiber Reinforced Polymers (CFRP) strips to retrofit SCC walls after earthquake was unclear. For this purpose, four SCC walls were first tested to failure under cyclic lateral loads and thereafter repaired and re-tested. The first crack load, crack pattern, yield load, and peak load of tested specimens were measured and compared. It was found that replacing buckled rebar and applying proper CFRP repairing scheme could recover the seismic resistance of damaged SCC walls . However, if purely rely on CFRP repairing schemes without replacing of the buckled rebar, the yield load, peak load, and initial stiffness could not be properly recovered. However, as long as CFRP repairing schemes applied, the degradation of strength and stiffness of repaired specimens was slower than that of counterpart without retrofitting , which resulted in enhancement of relatively larger drift ratio.

Publication Type: Article
Additional Information: © Elsevier 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Steel-concrete composite, Structural wall, Seismic, CFRP, Repair
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Civil Engineering
URI: https://openaccess.city.ac.uk/id/eprint/23443
[img] Text - Accepted Version
This document is not freely accessible until 13 January 2021 due to copyright restrictions.
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