Use of engineered cementitious composite panels for seismic strengthening

Download
2018
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.

Suggestions

Seismic vulnerability, behavior and design of tunnel form building structures
Balkaya, C; Kalkan, E (Elsevier BV, 2004-12-01)
Multi-story reinforced concrete tunnel form buildings are one of the common structural types in regions prone to high seismic risk due to the buildings inherent earthquake resistance and ease of construction. Despite their good performance during earthquakes in 1999 in Turkey, and abundance of such structures scattered worldwide, current seismic codes and design provisions provide insufficient guidelines for their seismic design. As a compensatory measure, a series of modal and nonlinear static analyses are...
Economic assessment of the seismic retrofitting of low-cost apartment buildings
Arıkan, Mehmet Fırat; Macit, G (Informa UK Limited, 2005-07-01)
When structural retrofitting of buildings is required due to seismic safety considerations, building owners or government officials are faced with a crucial decision whether to demolish and rebuild their buildings, or retrofit them. Simple decisions based on fixed proportions, such as demolish and rebuild if retrofit costs exceed 40% of the replacement cost, may be misleading. A financial analysis should be carried out considering all the revenues and costs of the building during its life time. A low-cost r...
Modelling of strengthened hollow brick infills
BARAN, MEHMET; Ozcelik, Ramazan; Sevil, Tugce; Canbay, Erdem (2013-02-01)
Strengthening the existing hollow brick infill walls by bonding high-strength precast concrete panels or applying steel fibre reinforced mortar was found to be an occupant-friendly seismic retrofitting technique for the buildings in use with deficient reinforced concrete structural systems. Both techniques convert the existing non-structural hollow brick infill walls into load-carrying structural members. To verify the effectiveness of the techniques, 20 reinforced concrete frames with hollow brick infill w...
The Effect of infill walls on the seismic performance of boundary columns in reinforced concrete frames
Fenerci, Aksel; Binici, Barış; Department of Civil Engineering (2013)
Reinforced concrete frames with unreinforced masonry infill walls constitute a significant portion of the building stock throughout the world. Infill walls in these buildings are generally considered as non-structural elements and neglected during design and assessment. On the other hand, observations after several earthquakes revealed that infill walls may have detrimental effects on the adjacent frame members. This observation brings out the requirement for further research on the effects of infill walls ...
Multistage seismic assessment methods for existing reinforced concrete buildings and their applicability for retrofitting cost estimation
Doğan, Onur; Yücemen, Mehmet Semih; Koçyiğit, Ali; Department of Earthquake Studies (2013)
When the huge building stock in Turkey is considered, it is practically impossible to carry out detailed structural analyses for all of the buildings. In order to cope with the seismic safety evaluation of a large number of existing buildings, it is necessary to use simplified techniques, which can predict the seismic vulnerability of the existing buildings in a relatively short time. The comprehensive structural data compiled for the 48 different reinforced concrete buildings contain full information on th...
Citation Formats
M. E. Ayatar, “Use of engineered cementitious composite panels for seismic strengthening,” Ph.D. - Doctoral Program, Middle East Technical University, 2018.