Effects of Superstructure Properties on Pile Forces in Straight Integral Bridges under Live Load

Öz

In this study, the effects of truck loads on pile forces for straight integral bridges is investigated together with the variations in superstructure parameters. For this purpose, finite element models of numerous three-dimensional integral bridges are built and the analyses are conducted under AASHTO LRFD live loads. Truck loads are located in various longitudinal and transverse positions on the bridge in order to get the most critical loading. In the analyses, the superstructure parameters such as bridge length, girder type, girder spacing, number of girders, slab thickness and cantilever length are considered and the pile forces for all these bridges are obtained. The analyses results reveal that all the superstructure parameters except girder type and slab length have significant effect on pile forces. Additionally, in almost all bridges, for some load cases tension forces in piles are observed. 

Anahtar Kelimeler

• Integral bridge,Superstructure,Live load,Pile force

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

Öz

Bu çalışmada, integral köprülerin kazıklarında oluşan kuvvetlere hareketli yüklerin etkisi, çeşitli üstyapı parametrelerinin değişimleriyle birlikte incelenmiştir. Bu amaçla, birçok üç boyutlu integral köprünün sonlu elemanlar modelleri kurulmuştur. Bu modellerin analizleri AASHTO LRFD hareketli yükleri altında yapılmıştır. Hareketli yükler en kritik etkileri bulabilmek için köprüler üzerinde enine ve boyuna yönde farklı konumlara yerleştirilmişlerdir. Analizlerde köprü uzunluğu, kiriş boyutu ve aralığı, kiriş adedi, tabliye kalınlığı ve konsol uzunluğu gibi çeşitli üstyapı parametreleri ele alınmıştır. Sonlu elemanlar analizleri sonucunda farklı parametrelere bağlı kazık kuvvetleri elde edilmiştir. Analizler sonucunda, kiriş tipi ve tabliye kalınlığı dışındaki parametrelerinin kazık kuvvetlerini önemli ölçüde etkiledikleri gözlenmiştir. Ayrıca, ele alınan birçok köprüde yükleme durumlarına bağlı olarak bazı kazıklarda çekme kuvveti oluşmuştur.

Anahtar Kelimeler

• İntegral köprü,Üstyapı,Hareketli yük,Kazık kuvveti

Kaynakça

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