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Title: | Semi-Active Control of 3D- Vertically Isolated Buildings with Divided Skeleton into Inner and Outer Subsystems with MR- Dampers |
Authors: | Hosseini, Mahmood (Supervisor) Babaei, Sasan Eastern Mediterranean University, Faculty of Engineering, Dept. of Civil Engineering |
Keywords: | Civil Engineering Department Earthquake resistant design Earthquake engineering Vertical isolation, Semi-active control, MR damper, Performance-based design |
Issue Date: | Sep-2022 |
Publisher: | Eastern Mediterranean University (EMU) - Doğu Akdeniz Üniversitesi (DAÜ) |
Citation: | Babaei, Sasan. (2022). Semi-Active Control of 3D- Vertically Isolated Buildings with Divided Skeleton into Inner and Outer Subsystems with MR- Dampers. Thesis (M.S.), Eastern Mediterranean University, Institute of Graduate Studies and Research, Dept. of Civil Engineering, Famagusta: North Cyprus. |
Abstract: | In vertical isolation, the lateral load resisting system is divided into two substructures
which are stiff with less system mass and flexible with more system mass. As the
system experiences an earthquake, vertical isolation benefits from the prominent
difference between the periods of the two sub-systems and the damping mechanisms
placed between them across the height. Though effective passive isolation techniques
are still susceptible to seismic source characteristics. In this study, the semi-active
controlled strategy by using the magnetorheological dampers was investigated in a 3D
state in 6, 9, and 12- story buildings, with skeletons divided into two inner and outer
sub-systems as stiff and flexible parts. The lumped mass 3D models of the buildings
are introduced to MATLAB and subjected to 7 bidirectional ground motions. The
analysis results showed that the passive control of viscous dampers is only effective in
harnessing the stiff sub-system response to nearly half of the uncontrolled building.
However, in the soft sub-system, the inter-story drift on average is 16 percent greater
than the uncontrolled building. The semi-active control, however, at the stiff sub-system has a maximum roof displacement, acceleration, and inter-story rotation nearly
to 10, 40, and 14 percent of the uncontrolled ones. In addition, the average response
for the soft sub-system remained less than half. ÖZ:
Dikey izolasyonda, yanal yüke dayanıklı sistem; daha az sistem kütlesi ile sert ve daha
fazla sistem kütlesi ile esnek olmak üzere iki alt yapıya ayrılır. Sistem bir depreme
maruz kaldığında, iki alt sistemin periyotları arasındaki belirgin farktan ve yükseklik
boyunca sistemlerin aralarına yerleştirilen sönüm mekanizmalarından dikey izolasyon
yararlanır. Etkili pasif izolasyon teknikleri hala sismik kaynak özelliklerine duyarlıdır.
Bu çalışmada, iskeletleri rijit ve esnek olarak iki iç ve dış alt sisteme ayrıldığı 6, 9 ve
12 katlı 3 boyutlu binalarda manyetoreolojik sönümleyiciler kullanılarak yarı aktif
kontrollü strateji incelenmiştir. Binaların toplanmış kütleli 3 boyutlu modelleri
MATLAB'ta modellenmiş ve çift yönlü 7 yer hareketine tabi tutulmuştur. Analiz
sonuçları, viskoz damperlerin pasif kontrolünün, yalnızca kontrolsüz binanın
neredeyse yarısına karşı katı alt sistem tepkisinden yararlanmada etkili olduğunu
göstermiştir. Ancak, yumuşak alt sistemde, katlar arası göreli kat ötelenme, kontrolsüz
binaya göre, ortalama yüzde 16 daha fazla olmaktadır. Bununla birlikte, sert alt
sistemdeki yarı aktif kontrol, kontrol edilmeyenlerin yaklaşık yüzde 10, 40 ve 14'ine
eşit maksimum çatı yer değiştirmesi, ivmesi ve katlar arası dönmeye sahip olmaktadır.
Ek olarak, yumuşak alt sistem için ortalama tepki yarıdan daha az kalmaktadır. |
Description: | Master of Science in Civil Engineering. Institute of Graduate Studies and Research. Thesis (M.S.) - Eastern Mediterranean University, Faculty of Engineering, Dept. of Civil Engineering, 2022. Supervisor: Prof. Dr. Mahmood Hosseini. |
URI: | http://hdl.handle.net/11129/6086 |
Appears in Collections: | Theses (Master's and Ph.D) – Civil Engineering
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