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Construction Engineering Department
Shear deficient beam-column joints in existing concrete buildings are believed to have caused partial or total structural collapses during past earthquakes. These joints primarily lack joint transverse reinforcement. A recent NEES grand challenge project resulted in detailed assessment tools for the seismic vulnerability of beam-column joints in existing buildings; however, retrofit strategies were not suggested. The literature body includes various retrofit solutions for interior and exterior joints. However, most of these solutions are either very expensive or highly invasive. The intent of retrofit is usually to have deficient joints to conform to ACI 352 to allow for flexural yielding in the beam using minimal joint alteration. This paper presents a simple retrofitting method for existing exterior beam-column joints that aims to transfer the mode of failure from joint shear failure to a weak-beam-strong column one with no shear degradation in the joint. The retrofit solution is validated through an experimental program that consists of testing four exterior beam-column joint sub-assemblages.
NCEE 2014 - 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering
Earthquake Engineering Research Institute
Hassan, W. M.
(2014).Seismic retrofit of shear critical beam-column joints in existing concrete buildings. Earthquake Engineering Research Institute. , 1-16
Hassan, Wael, et al.
Seismic retrofit of shear critical beam-column joints in existing concrete buildings. Earthquake Engineering Research Institute, 2014.pp. 1-16