Abstract
In recent years, a variety of strengthening methods have been developed to improve the seismic performance of reinforced concrete (RC) frame structures with non-seismic details. In this regard, this study proposes a new type of seismic strengthening method that compresses prefabricated precast concrete (PC) walls from the outside of a building. In order to verify the proposed method, a RC frame structure strengthened with precast walls was fabricated, and cyclic loading tests were performed. The results showed that specimens strengthened using the proposed method exhibited further improvements in strength, stiffness and energy dissipation capacity, compared to RC frame structures with non-seismic details. In addition, a nonlinear analysis method, capable of considering the flexural compression and shear behaviors of the walls, was suggested to analytically evaluate the structural behavior of the frame structures strengthened by the proposed method. Using this, an analysis model for frame structures strengthened with precast walls was proposed. Through the proposed model, the analysis and test results were compared in relation to stiffness, strength, and energy dissipation capacity. Then, the failure mode of the column was evaluated based on the pushover analysis. In addition, this study proposed a simplified analysis model that considered the placement of longitudinal reinforcements in shear walls.
Highlights
As a large number of reinforced concrete (RC) frame structures with non-seismic details have been severely damaged, many researchers [1,2,3,4,5,6] have investigated the infill wall-strengthening method to improve seismic performance by inserting cast-in-place concrete or precast (PC) walls inside the beam–column frame structure
This study proposes an advanced seismic strengthening usingproposes the externally anchored precaststrengthening wall panel (EPCW)
The analysis model proposed in this study provided relatively accurate predictions of the behavior of frame structures strengthened with precast walls
Summary
As a large number of RC frame structures with non-seismic details have been severely damaged, many researchers [1,2,3,4,5,6] have investigated the infill wall-strengthening method to improve seismic performance by inserting cast-in-place concrete or precast (PC) walls inside the beam–column frame structure. Frosch [2] presented the shear key connection details of PC panels to improve the infill wall-strengthening method, and Almusallam and Al-Salloum [3] proposed a strengthening method using the fiber reinforce polymer (FRP). This study proposes an advanced seismic strengthening usingproposes the externally anchored precaststrengthening wall panel (EPCW). This study an advanced seismic methodThe using the method proposed in this studywall can panel significantly shorten the construction period, because precast externally anchored precast (EPCW). The EPCW method proposed in thisthe study can wall panels are connected with the existing frames on the thepanels building. Is an advantage in internal specimens ofused, RC frame structures with non-seismic details that are strengthened by the EPCW space can be even during construction. The accuracy of the proposed model is verified by comparing the analytical and test results
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