Repairing and Strengthening of an Existing Reinforced Concrete Building: A North Cyprus Perspective

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Yalçıner H., Hedayat A.

AMERICAN JOURNAL OF ENGINEERING AND APPLIED SCIENCES, cilt.3, sa.1, ss.109-116, 2010 (Hakemli Dergi)

Özet

Inadequate attention during design and construction of some of

Reinforced Concrete (RC) buildings in North Cyprus has raised questions about the performance level

of these existing buildings under future earthquakes. Approach: Column jacketing, adding steel braces

and new shear walls to an existing building are common strengthening methods used by practical

engineers in North Cyprus to increase the performance level of an existing building. Results: The aim

of this study was to determine the most effective strengthening method among these three mentioned

techniques. As a case study, a four stories RC existing building was selected and assessed using finite

element method. To remodel of the existing building, the survey works done included three main

steps, detecting the reinforcement bars for beams and columns, actual used concrete strength and

soil type. The beams and columns reinforcement bars were determined using Ferro scan method and the

soil was sampled in Girne city to determine the soil type. The actual concrete strength was determined

using core test. Three common strengthening techniques mentioned above, were applied to the existing

building. Then the efficiency of each strengthening method was investigated on the basis of removing

of weak columns, not-safe beam-column joints in shear and performance levels based on the

FEMA356 and Turkish earthquake code. Conclusion/Recommendations: Results showed that column

jacketing is the most effective method to remove the weak columns and not-safe column-beam joints

in shear. Nonlinear static pushover results showed that despite that adding shear walls caused an

increase in the structural base shear and a reduction in the maximum roof displacement and the number

of collapsed elements at FEMA356 performance point, but it caused a remarkable reduction in the

building ductility ratio. Finally, results showed that the column jacketing is the most effective and the

most economic strengthening technique for the low-rise residential buildings in North Cyprus.