Strengthening of Reinforced Concrete Frames Not Designed According to TDY2007 with External Shear Walls

Abstract

Recently repair and strengthening of existing buildings become a popular research topic. The strengthening of buildings necessitates the evacuation of the structure. On the other hand, school, hospital type structures must continue their function. In this study exterior shear wall addition to the existing exterior frames is proposed. Since the application is applied to the exterior of the building, the structure can continue its function during the application. In this study, 1/3 scaled 4 specimens were tested under reversed cyclic loading simulating the seismic action. First reference specimen was the bare frame and didnt contain a strengthening and tested to see the reference behavior. Specimens have several design mistakes to represent the existing older structures. The other specimens retrofitted with different configurations. The second specimen was strengthened with exterior shear walls and contained a window opening. The last specimen was also retrofitted with exterior shear wall but the shear walls were divided into two pieces. The load-displacement curves, envelope curves, relative displacement curves, energy absorption curves and rigidity curves were presented and compared within the paper. In the conclusion, the capacity increase of the frame was discussed and several recommendations were presented.

Investigation of Short Column Behaviors at 1/5 Scaled Reinforced Concrete Frames Using Different Strengthening Methods

“…The lateral loading was continued as load controlled until the yield point. After the lateral loading was reached the yield point, it was continued the experiment as displacement controlled (Unal et al, 2014). The experiments were terminated by applying a load cycle at both directions, after the maximum load level decreased by 20% (0.8xV max ).…”

“…The experiments were terminated by applying a load cycle at both directions, after the maximum load level decreased by 20% (0.8xV max ). According to TEC-2007, at least 10% axial load of design compressive load should be applied for bearing system members that will be dimensioned as a column (Unal et al, 2014). Furthermore, according to TEC-2007, the maximum axial load level for the columns is limited to 50%.…”

“…At these RC frames, the columns were 60x90 mm and the beams were 90x90 mm. While determining the dimensions of columns and beams in reinforced concrete frames, size details of 1/3 scale specimens in the literature were taken into consideration (Altin et al, 2008;Anil and Altin, 2007;Unal et al, 2014). The maximum size of aggregates used in the production of concrete of Fatih Süleyman BALIK ve Fatih BAHADIR…”

Behaviour of 3D RC frames placed at different angles on shaking table

“…Test frames were deliberately detailed and constructed with some deficiencies such as low strength concrete, strong beamweak column formation, wide spacing of beam and column stirrups, no column stirrups at the beam-column joints, and no confinement zones at the end of the columns and beams [19][20][21]. In addition to these deficiencies, the stirrups were prepared with hooks placed at 90° at free ends of columns and beams of the test specimens [19][20][21]. The height of one storey was 500 mm (3000 mm at real-size 1:1 scale).…”

An Analytical Study About the Use of Steel Plate Shear Walls to Improve Lateral Rigidity of Reinforced Concrete Framed Structures

“…The author also included the contribution of the strengthening work and the added steel frame to the aesthetics of the building. Korkmaz (2012), Unal (2012) and Bahadir (2012) examined the strengthening of 1/3 scale reinforced concrete test frames with reinforced concrete walls added to the façade. In the analytical study by Dere (2016), finite element models of 2-story and single-span test frames, which had been tested by Korkmaz (2012), were formed in ABAQUS (2020, Computer software, Dassault Systèmes) environment.…”