Experimental behavior of full-scale exterior beam-column space joints retrofitted by ferrocement layers under cyclic loading

Shaaban, Ibrahim and Seoud, Osama A (2018) Experimental behavior of full-scale exterior beam-column space joints retrofitted by ferrocement layers under cyclic loading. Case Studies in Construction Materials, 8. 61 - 78. ISSN 2214-5095

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Abstract

A majority of the traditional reinforced concrete frame buildings, existing across the Middle East, lack adequate con fi nement in beam-column joints, or in other words, are shear de fi cient because they were constructed before the introduction of seismic codes for construction. This research studies the experimental behavior of full-scale beam-column space (three-dimensional) joints under displacement-controlled cyclic loading. Eleven joint specimens, included a traditionally reinforced one (without adequate shear reinforcement), a reference one with su ffi cient shear reinforcement according to ACI 318, and nine specimens retro fi tted by ferrocement layers, were experimentally tested to evaluate a retro fi t technique for strengthening shear de fi cient beam column joints. The studied variables were the number of layers, orientation angle of expanded wire mesh per layer, and presence of steel angles in the corners of joint specimen prior to wrapping with ferrocement layers. The experimental results showed that proper shear re- inforcement for the test joints, according to ACI 318, enhanced the behavior of the specimen over that of the traditionally reinforced specimens without adequate shear reinforcement. The joints retro fi tted by ferrocement layers showed higher ultimate capacity, higher ultimate displacement prior to failure (better ductility), and they did not su ff er heavily damage as observed for the traditionally reinforced one. Increasing the number of ferrocement layers for retro fi tted speci- mens led to improving performance for such specimens compared to the traditionally reinforced ones in terms of enhancing the ultimate capacity and ultimate displacement. Specimens retro- fi tted by ferrocement layers reinforced by expanded wire mesh of 60° orientation angle showed slightly better performance than those of 45° orientation angles. Retro fi tting using steel angles in addition to ferrocement layers improves the seismic performance of the specimens, achieves better stability for sti ff ness degradation, attains higher capacity of the dissipated energy, and reduces the vulnerability of joints to excessive damage. Based on the experimental work in this study, it is recommended to retro fi t beam-column joint specimens by two ferrocement layers in addition to steel angles as sti ff eners taking the orientation angle of expanded wire mesh into consideration.

Item Type: Article
Uncontrolled Keywords: Retrofitting, Beam-column space joints, Ferrocement layers, Orientation of expanded wire mesh, Ultimate capacity Stiffness degradation, Cyclic loading, Shear deficient, Traditionally reinforced building
Subjects: Construction and engineering
Depositing User: Kevin Sanders
Date Deposited: 04 Dec 2017 09:06
Last Modified: 01 Apr 2019 09:46
URI: http://repository.uwl.ac.uk/id/eprint/5890

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