Rapid Repair of Earthquake Damaged RC Interior Beam-Wide Column Joints and Beam-Wall Joints Using FRP Composites
This paper studies the seismic performance of FRP-strengthened RC interior non-seismically detailed beam-wide column and beam-wall joints after limited seismic damage. Four eccentric and concentric beam-wide column joints and two beam-wall joints, initially damaged in a previous study, were repaired and tested under constant axial loads (0.1 and 0.35 ) and lateral cyclic loading. The rapid repair technique developed, aimed to restore the original strength and to provide minimum drift capacity. The repair schemes were characterized by the use of : 1) epoxy injection and polymer modified cementitious mortar to seal the cracks and replace spalled concrete and 2) glass (GFRP) and carbon (CFRP) sheets to enhance the joint performance. The FRP sheets were effectively prevented against possible debonding through the use of fiber anchors. Comparison between responses of specimens before and after repair clearly indicated reasonable restoration in strength, drift capacity, stiffness and cumulative energy dissipation capacity. All specimens failed with delamination of FRP sheets at beam-column joint interfaces. The rapid repair technique developed in this study is recommended for mass upgrading or repair of earthquake damaged beam-column joints.
Jingsi Huo, Yan Xiao, Zongjin Li and Shuaib Ahmad
B. Li and H.Y.G. Chua, "Rapid Repair of Earthquake Damaged RC Interior Beam-Wide Column Joints and Beam-Wall Joints Using FRP Composites", Key Engineering Materials, Vols. 400-402, pp. 491-499, 2009