Investigation of infill wall modelling techniques on a substandard reinforced concrete frame

Year 2021, Volume: 36 Issue: 1, 147 - 162, 01.12.2020

İsmail Durğut Onur Tunaboyu Özgür Avşar

https://doi.org/10.17341/gazimmfd.673866

Abstract

Infill walls are mostly considered as distributed load only on the beams in the design and assessment of RC buildings. However, it has been emphasized by many researchers that the infill walls have a considerable impact on the seismic behavior of reinforced concrete frames. The infill walls can cause brittle shear damages at the ends of the boundary columns during the earthquake. The column shear damage can even lead to total collapse of reinforced concrete buildings. Therefore, considering the infill walls in analytical models is essential for achieving realistic structural design and assessment. Hence the infill wall modeling method should satisfactorily reproduce the internal forces that are developed in the frame columns. In this study, the experimental results of an infilled RC frame were used to investigate the effectiveness of infill wall modeling techniques by comparing with the analytically obtained cyclic response of the tested frame. Analytical modelling of infill walls was made by considering four different force-displacement relations and six different geometric modelling techniques. The most appropriate modelling technique is sought through the investigated ones that has the closest results with the cyclic response of the tested frame. Moreover, a parallel two-strut model was proposed as an original infill wall modelling technique.

Keywords

Infill wall modelling, pushover analysis, substandard, reinforced concrete, shear damage

Dolgu duvar modelleme tekniklerinin standart-altı betonarme bir çerçeve üzerinde irdelenmesi

Abstract

Dolgu duvarlar genellikle kirişlerin üzerindeki yayılı yük olarak betonarme hesaplara dahil edilmektedir. Ancak, dolgu duvarların betonarme çerçevelerin davranışına etkilerinin olduğu birçok araştırmacı tarafından vurgulanmıştır. İyi dayanımlı boşluksuz dolgu duvarlar deprem sırasında kenar kolonlarda gevrek kesme hasarları oluşturabilmektedir ve bu hasar betonarme yapının tamamen göçmesine dahi sebep olabilmektedir. Dolayısıyla, gerçekçi yapı davranışının elde edilebilmesi için dolgu duvarların analitik modele dahil edilmesi büyük önem arz etmektedir. Dolgu duvar modelleme yöntemi ile çerçeve kenar kolonlarda neden olacağı iç kuvvetlerin gerçeğe yakın bir şekilde hesaplanabilmesi gerekmektedir. Bu nedenle, bu çalışmada laboratuvar ortamında test edilmiş dolgu duvarlı standart-altı betonarme bir çerçevenin tersinir tekrarlı yükler altında elde edilen kapasite eğrisi ve çerçeve kolonlarında oluşan yapısal hasarları literatürde kullanılan dolgu duvar modelleme yöntemleriyle analitik olarak elde edilmeye çalışılmıştır. Bu kapsamda dört farklı duvar malzeme modeli ile altı farklı geometrik modelleme tekniği kullanılmıştır. Test edilen dolgu duvarlı betonarme çerçevenin davranışına en yakın sonucu veren dolgu duvar modelleme yöntemi belirlenmiştir. Ayrıca, yeni bir dolgu duvar modelleme tekniği olarak paralel iki basınç çubuklu dolgu duvar modeli önerilmiştir.

Keywords

Dolgu duvar modelleme, itme analizi, standart-altı, betonarme, kesme hasarı

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