A Practical Method for Strengthening/Repairing Poorly Detailed RC Beam-Column Joints in Developing Countries: Installing Wing Walls To Existing Columns

Abstract eng:
This study develops a practical method for strengthening or repairing poorly detailed reinforced concrete (RC) beamcolumn joints which contain no transverse reinforcement, by installing RC wing walls beside existing columns. Such substandard beam-column joints were often observed in RC buildings after recent major earthquakes attacked developing countries. Three 1:2.5 scale partial frame specimens were prepared representing an exterior 1.5-story moment resisting frame with beam-column joint of a two-story RC building damaged in the 2013 Bohol earthquake, Philippines. One of them was for the benchmark specimen. Another was strengthened by the proposed strengthening method. The third one was repaired with the same details as the strengthened specimen after moderately damaged by a pre-loading simulating the seismic damage. Reversed cyclic loading tests were conducted. Consequently, the benchmark specimen suffered severe damage to the joint region with buckling of column longitudinal rebars; the strengthened specimen showed a ductile behavior with beam yielding; and for the repaired specimen, the beam yielded and the maximum strength was recorded approximately as high as that of the strengthened specimen, and the damage in joint region was more severe/slighter compared to the strengthened/benchmark one. The test results indicated that the developed method is practical for strengthening poorly detailed beam-column joints or repairing moderately damaged ones.

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