Live load distribution equations for integral bridge substructures

Erhan, Semih; Dicleli, Murat

doi:10.1016/j.engstruct.2009.01.020

Cited by 16 publications

(9 citation statements)

References 19 publications

(42 reference statements)

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“…In spite of a lot of numerical and experimental works in passive pressure evaluation, the behaviour of this type of bridges has not already been well defined (Dicleli, Erhan 2010;Erhan, Dicleli 2009;Fang et al 1994Fang et al , 2002Fang, Ishibashi 1986;James, Bransby 1970;Kim, Laman 2010b;Noorzaei et al 2010).…”

Section: Fig 2 a Schematic View Of Integral Bridges Abutmentmentioning

confidence: 97%

An Investigation on the Effect of Cyclic Displacement on the Integral Bridge Abutment

Movahedifar

Bolouri-Bazaz

2014

Journal of Civil Engineering and Management

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The integral bridge abutment, as a special type of retaining wall, is subject to cyclic displacement, which is due to the daily and seasonal temperature variations. The frame of this type of bridges is rigid and jointless. This requires that the slab of the bridge to be longitudinally continuous without expansion joints. This causes cyclic displacement to be imposed to the backfill material of integral bridge abutment. It should be pointed out that the omission of expansion joints helps to provide a fluent traffic and a reduction in maintenance and repair of the bridges. To investigate the impact of cyclic displacement on the loose backfill soil behaviour, an innovative laboratory retaining wall model has been designed and constructed to imitate the cyclic behaviour of backfill granular material. In addition, a numerical model, based on finite element method, has been developed to interpret the experimental results. This model was calibrated using the laboratory test data. The results indicate that the passive pressure, except for low amplitude displacement, escalates with progressive number of cycles and its distribution is not linear, which is due to the forming arch.

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Section: Fig 2 a Schematic View Of Integral Bridges Abutmentmentioning

confidence: 97%

An Investigation on the Effect of Cyclic Displacement on the Integral Bridge Abutment

Movahedifar

Bolouri-Bazaz

2014

Journal of Civil Engineering and Management

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“…Bu araştırmaların bir kısmında, üstyapı-uçayak sürekliliğinin ısıl yükler altındaki integral köprülerin performansı üzerine çalışmalar yapılmıştır [14,15]. İntegral köprülerde hareketli yük dağılımı ile ilgili çalışmalar yakın zamanda artış göstermiştir [16][17][18][19][20][21][22][23]. Bu çalışmalardan bazılarında Dicleli ve arkadaşları verevsiz integral köprülerin kirişleri ve altyapı elemanları için hareketli yük dağılım denklemleri geliştirmişlerdir [19,20].…”

Section: öNceki̇ çAlişmalarunclassified

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

Yalçin

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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

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“…This superstructure model is shown in Figure 3. Further details of this model and comparisons with other models (Imbsen and Nutt 1978;Brockenbrough 1986;Tarhini and Frederick 1992) available in the literature are summarized and discussed by Erhan and Dicleli (2009). Accordingly, the bridge slab is modeled using quadrilateral shell elements and the girders are modeled using 3-D frame elements as shown in the 3-D structural models presented in Figure 2.…”

Section: Superstructure Modeling For Iabs and Ssbsmentioning

confidence: 99%

“…In addition, to model the rigidity of the deck-abutment joint, the abutment's shell elements located within the joint area are assigned a large modulus of elasticity. Further details about these modeling techniques can be found in Erhan and Dicleli (2009). The abutment is divided into rectangular shell elements with a side length of 0.6 m in horizontal direction as compatible with the superstructure.…”

Section: Substructure Modeling For Iabsmentioning

confidence: 99%

Comparative Study on the Effect of Number of Girders on Live Load Distribution in Integral Abutment and Simply Supported Bridge Girders

Yalçin

Dicleli

2013

Advances in Structural Engineering

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In this study, the effect of the number of prestressed concrete girders on the distribution of live load effects among the girders of integral abutment bridges (IABs) and simply supported bridges (SSBs) is investigated. For this purpose, two and three dimensional finite element models (FEMs) of several single-span IABs and SSBs are built and analyzed. In the analyses, bridges with various superstructure properties, such as span length, girder type and size, slab thickness are considered. The finite element analyses (FEA) results are then used to calculate the live load distribution factors (LLDFs) for the girders of IABs and SSBs as a function of the number of girders. Comparison of the analyses results revealed that, LLDFs for SSBs vary slightly as the number of girders changes. However, in the case of IABs, it is found that while the LLDFs for the girder moments decrease significantly as the number of girders increases, the number of girders has a negligible effect on the LLDFs for the girder shear. Accordingly, the number of girders is added as a new parameter to the previously developed correction factors for AASHTO LRFD LLDFs for the girder moment. It is observed that the developed formulae yield a reasonably good estimate of live load effects in prestressed concrete IAB girders.

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Live load distribution equations for integral bridge substructures

Cited by 16 publications

References 19 publications

An Investigation on the Effect of Cyclic Displacement on the Integral Bridge Abutment

An Investigation on the Effect of Cyclic Displacement on the Integral Bridge Abutment

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

Comparative Study on the Effect of Number of Girders on Live Load Distribution in Integral Abutment and Simply Supported Bridge Girders

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