Use of engineered cementitious composite panels for seismic strengthening

Ayatar, Mehmet Engin
Due to the massive number of deficient buildings in seismically active zones, the demolition and rebuilding of such structures is not a viable option. Instead, rehabilitation of seismically deficient buildings is commonly employed. Although, the most preferred rehabilitation approach has been the application of RC infills to the frames, this technique inevitably causes the evacuation of the structure. Therefore, there have been many studies on new occupant-friendly strengthening techniques. The aim of this study is to contribute to such retrofit alternatives, and to strengthen the masonry infill walls by means of Engineered Cementitious Composite (ECC) panels. ECC is a mortar based composite reinforced with fibers. The main components of ECC are Portland cement, fly ash, water, silica sand, PolyVinyl Alcohol (PVA) fiber, and superplasticizer. In this study, a strengthening technique with implementing engineered cementitious composite (ECC) panels bonded to hollow brick infill walls was investigated experimentally and analytically. Three test frames noncompliant according to the Turkish Seismic Resistant Design Code (2007), were constructed and tested during the course of the study. The test specimens were composed of three story, three bay, and ½ scaled frames. The first specimen was a bare frame, whereas the other two frames had hollow brick walls at the central bay. The third frame was strengthened with ECC panels on the infill walls. Specimens were tested by using a Pseudo Dynamic (PsD) loading scheme. Synthetic ground motions compatible with the Düzce city center response spectrum were used for the three PsD tests. The performance of the proposed strengthening technique was evaluated based on the comparison of experimental results and nonlinear time history analyses of frames.


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Citation Formats
M. E. Ayatar, “Use of engineered cementitious composite panels for seismic strengthening,” Ph.D. - Doctoral Program, Middle East Technical University, 2018.