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Repairing Seismic Damaged Concrete Frames of Intermediate Moment
Resistant by X Bracing

A. Vatani Oskouei, and M.H. Rafiee

Faculty of Civil Engineering, Shahid Rajaee University, Lavizan, Tehran, IRAN

Abstract: In the new generation of RC buildings, three performance levels, namely serviceability,life safety, and collapse
1605612112

, – ./ $ ** $ *
prevention, are accepted for designing the concrete structure. Depending on the magnitude of the earthquake, cracking and plastic deformations are permitted. In this study, 8 low- to mid-rise (one to eight stories) intermediate moment-resistant RC frames were chosen. The frames were analyzed and designed based on the current seismic design code. Using the nonlinear pushover analysis, strength/stiffness degradation and residual strain and deformation of the damaged frame at the performance point of the frames were studied. In this study, the damaged frames were modeled with respect to the damage level. The damage levels of the frames depended on height and the period of the frames. The stiffness of the damaged frame degraded by about 30% compared to the original but strength deteriorated by about 10%. The ultimate displacements of the damaged frames reduced by about 50% compared to the original. Xbracing system was used for repairing and rehabilitating the damaged frames for suitable performanceduring future earthquake events. The bracing increased stiffness and strength but decreased period and displacement of frames.

Keywords: Earthquake, Concrete, Damage, Repair, Performance Level, Brace, Plastic hinge.

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