Betonarme binaların deprem davranışlarının artımsal dinamik analiz yöntemiyle değerlendirilmesi

Yıl 2016, Cilt: 7 Sayı: 1, 23 - 31, 01.06.2016

Mehmet Emin Öncü Merve Şahin Yön

Öz

Bu çalışmada, betonarme binaların sismik davranışı artımsal dinamik analiz yöntemi kullanılarak
araştırılmıştır. Sayısal çalışma için betonarme çerçeve bir bina seçilmiştir. Seçilen bina için doğrusal
olmayan statik itme (Pushover) analizi ve artımsal dinamik analizler yapılmıştır. Doğrusal olmayan dinamik
analizler için seçilen dört deprem ivme kaydı Türk Deprem Yönetmeliğinde Z2 zemin sınıfına göre
tanımlanan spektruma ölçeklendirilmiştir. Analizler sonucunda binanın kapasite eğrisi, maksimum tepkileri
ve göreli kat ötelemeleri elde edilmiştir. Tepki değerleri kullanılarak binanın idealize edilmiş dinamik
pushover eğrisi belirlenmiştir. Elde edilen sonuçlara göre seçilen binanın artımsal dinamik analizlerinin
yapılmasının deprem davranışının daha doğru tespit edilebilmesi için uygun olacağı görülmüştür. Statik itme
analizinden elde edilen göreli kat ötelemelerinin 0.4g’ye kadar olan yer hareketine sahip depremlerin
dinamik analizlerinden elde edilen göreli kat ötelemelerinden daha büyük sonuçlar verdiği belirlenmiştir.

Anahtar Kelimeler

Artımsal dinamik analiz, Statik pushover analizi, Yayılı plastik mafsal.

Evaluation of seismic behavior of RC buildings using incremental dynamic analysis method

Öz

In this study, seismic behavior of reinforced
concrete buildings the pushover and incremental
dynamic analysis method was investigated.
For numerical application, 7 storeys and 4 bays
reinforced concrete frame with high ductility was
selected. The total height of the building is 23
meters. Height of the first story of the building is 5 m
and the upper story heights are 3 m. First and last
bays are 6 m, second and fourth bays are 5 m. It was
assumed that, the building importance coefficient
1.0.
For incremental dynamic analyses SeismoStruct
program which can simulate the inelastic response
of structural systems subjected to static and dynamic
loads was used. The selected earthquake records
were scaled according to the elastic design spectrum
for Z2 soil class defined in Turkish Seismic Code
(TSC).
A numerical study was performed for a reinforced
concrete frame building. Pushover analysis
according to triangular load shapes and incremental
dynamic analyses were performed for selected
building. For the nonlinear analysis, four ground
motion records were selected to ensure compatibility
with the design spectrum defined in the Turkish
Seismic Code. The maximum response, dynamic
pushover curve, capacity curves, interstorey drifts of
the selected building were obtained. Results were
compared each other and good correlation was
obtained between the dynamic analyses envelope
and static pushover curves for the building.
According to results;
Displacement increases depend on the increasing of
ground acceleration. Minimum displacements occur
at 0.1g ground accelerations while maximum values
occur at 0.5g ground accelerations for all
earthquakes.
The interstory drifts increases depend on increasing
of peak ground accelerations. For upper stories the
interstory drifts obtained from scaled Imperial
Valley and Kobe earthquakes exceed interstory
drifts of the triangular load shapes. But, at lower
stories, interstory drifts obtained from these
earthquakes are under the interstory drifts of the
lateral static load shapes except Kocaeli and Loma
Prieta earthquakes.
According to the findings, the lateral static loading
shows dynamic behaviour of the selected building
until 0.5g ground accelerations and lower staories.
To evaluate the accurate behaviour of reinforced
concrete buildings, the dynamic pushover envelopes
should be compared with static pushover curve.

Anahtar Kelimeler

Incremental dynamic analysis, pushover analysis, distributed plastic hinge.