| Summary: | One-third scale single and double unit three-story tunnel form buildings (TFB) were designed, constructed and tested under quasi-static in-plane lateral cyclic loading. Both of the prototype specimens were designed using BS8110 to represent the state-of-the-art reinforced concrete tunnel form buildings in Malaysia. The aim of this paper is to compare the seismic performance of repaired single and double TFB in the laboratory using Carbon Fibred Reinforced Polymer (CFRP), steel angle and steel plate. The repair and retrofit technique is adopted herein to increase the lateral strength capacity, stiffness, ductility and equivalent viscous damping of the TFB so that it can withstand the earthquake excitations. Both specimens were tested starting from ±0.01%, ±0.1%, ±0.25%, ±0.5%, ±0.75%, ±1.0% and ±1.25% drifts until severe damage was observed. Then, the damage single unit TFB was repaired and strengthened using CFRP, steel angle and steel plate. Meanwhile, the damage double unit TFB was repaired and retrofitted using additional shear wall, steel angle and CFRP. In order to assess their seismic performance under in-plane cyclic loading, the experimental results from both specimens before and after repaired were compared with each other. Results show that the lateral strength capacity of repaired double unit TFB increases by 54% as compare to repaired single unit TFB and no significant damage was observed on failure mode for both specimens. The stiffness and ductility for repaired double unit TFB was increased by 4% and 2%, respectively as compared to repaired single unit TFB. It can be concluded that the proposed repaired and retrofitted technique and material used such as CFRP, steel plate, steel angle and additional of shear wall can be used for damaged tunnel form buildings after the moderate or strong earthquakes. © 2016, Construction Research Institute of Malaysia. All rights reserved.
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