Modeling Plastic Hinging Regions in Reinforced Concrete Bridge Columns

Yıl 2015, Cilt: 26 Sayı: 4, 7279 - 7286, 01.10.2015

Zeynep Fırat Alemdar

Öz

Examining the spread of
plastic deformations at various stages of loading is a complicated problem for
bridge structures under multi axial dynamic loading. A detailed three
dimensional nonlinear finite element model of a bridge column was developed
using the computer program ABAQUS and the model was compared with the measured
displacement results along the column of a bridge system subjected to dynamic
biaxial loadings in an earthquake simulator. The bridge system was subjected to
a series of test trials with increasing earthquake intensities. Computer
simulations were performed for complete trials in order to provide information
about the variation in the spread of plasticity. According to the results, it
was observed that changes in the length of plastic hinging regions on the
bridge column depend on the strain in the longitudinal reinforcement.

Anahtar Kelimeler

Reinforced concrete bridge column, FE modelling, photogrammetry, spread of plasticity

Betonarme Köprü Kolonlarında Plastik Mafsal Bölgelerinin Modellenmesi

Öz

Çok eksenli dinamik yükler etkisindeki betonarme
köprü yapılarında, yüklemenin farklı aşamalarında elastik olmayan şekil
değiştirmelerin dağılımının incelenmesi önemli ve zor bir problemdir. Betonarme
bir köprü kolonunun doğrusal olmayan 3 boyutlu detaylı bilgisayar modeli ABAQUS
sonlu elemanlar programında geliştirilmiş ve deprem sarsma tablalarında iki
eksenli dinamik yükler altında köprü kolonunda ölçülen deformasyon değerleri
model ile karşılaştırılmıştır. Yapılan deneysel çalışmalarda, betonarme köprü sistemine
şiddeti giderek artan bir seri deprem yüklemesi uygulanmıştır. Sonlu elemanlar
modelinde kolonlardaki plastikleşme bölgesinin yayılmasındaki değişiklikleri
incelemek için tüm deprem şiddetleri için analizler yapılmıştır. Değerlendirme
sonucu, kolonlarda oluşan plastikleşme bölgelerinin uzunluğunun kolondaki
boyuna donatının uzama miktarına bağlı olduğu görülmüştür.

Anahtar Kelimeler

Betonarme köprü kolonu, sonlu elemanlar modeli, fotoğrametrik ölçümler, plastikleşme boyu

Kaynakça

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• [9] Firat Alemdar, Z., Evaluation of Plastic Hinge Regions in Reinforced Concrete Bridge Systems, PhD. Thesis, University of Kansas, Lawrence, KS, 2010.
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