Finite-Element Analysis of Steel Girder Highway Bridges

Mabsout, Mounir; Tarhini, Kassim; Frederick, Gerald R.; Tayar, C.

doi:10.1061/(asce)1084-0702(1997)2:3(83)

Cited by 98 publications

(44 citation statements)

References 2 publications

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“…Basit mesnetli köprülerde hareketli yük dağılımları ile ilgili literatürde bulunabilen birçok çalışma yapılmıştır [8][9][10][11][12][13]. Bu çalışmalardan Zokaie ve arkadaşlarının [11] yaptığı çalışmaların sonuçları AASHTO LRFD standardında ilgili bölümün temelini oluşturmaktadır.…”

Section: öNceki̇ çAlişmalarunclassified

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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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Section: öNceki̇ çAlişmalarunclassified

“…Mabsout ve arkadaşları [13] [10] tarafından önerilen birinci modelleme tekniği, basit olmasına rağmen daha karmaşık olan diğer üç …”

Section: üStyapının Modellenmesiunclassified

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

Yalçin

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…One recent study ) compared actual load distribution factors of short and mid-span bridges (20-30 m) tested in Michigan to the 1998 LRFD Code (AASHTO 1998) prediction (with two lanes loaded), and revealed differences of up to 35%. Analytical results suggest that larger discrepancies exist for longer-span structures (Mabsout et al 1997;Eamon and Nowak 2002). Discrepancies exist primarily because traditional models do not account for features of actual bridges that may significantly affect load distribution.…”

Section: Introductionmentioning

confidence: 98%

Effect of Edge Stiffening and Diaphragms on the Reliability of Bridge Girders

Eamon

Nowak

2005

J. Bridge Eng.

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Secondary elements such as barriers, sidewalks, and diaphragms may affect the distribution of live load to bridge girders. The objective of this study is to evaluate their effect on girder reliability if these elements are designed to be sufficiently attached to the bridge so as not to It was found that typical combinations of secondary elements have a varying influence on girder reliability, depending on secondary element stiffness and bridge geometry. Suggestions are presented that can account for secondary elements and that provide a uniform level of reliability to bridge girders.

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“…AASHTO provisions tend to either over-estimate or underestimate the bending moment due to live loads when compared with the resulting maximum bending moment obtained using finite element analysis. In addition, finite element analyses show that by alternating the position of the truck loads transversely, the resulting bending moments tend to increase as the applied live loads come closer to the transverse edge of a bridge (Mabsout et al, 1997;Mabsout et al, 2004). [3]- [4] Reliability analysis is an effective tool for developing and assessing new and existing design codes.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, finite element analyses show that by alternating the position of the truck loads transversely, the resulting bending moments tend to increase as the applied live loads come closer to the transverse edge of a bridge (Mabsout et al, 1997;Mabsout et al, 2004). [3]- [4] Reliability analysis is an effective tool for developing and assessing new and existing design codes. AASHTO LRFD code was calibrated to create new load and resistance factors to reach a preselected safety target based on a reliability analysis using the basic design Eq.…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Reinforced Concrete Slab Bridges

Mahmoud¹

2017

GEOMATE

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Empirical expressions for estimating the wheel load distribution and live-load bending moment are typically specified in highway bridge codes such as the AASHTO procedures. The objective of this paper is to assess the reliability levels that are inherent in concrete slab bridges that are designed based on the simplified empirical live load equations in the AASHTO LRFD procedures. To achieve this objective, typical one and two-lane straight bridges with different span lengths were modeled using finite-element analysis (FEA) subjected to HS20 truck loading, tandem loading, and standard lane loading per AASHTO LRFD procedures. The FEA results were compared with the AASHTO LRFD moments in order to quantify the biases that might result from the simplifying assumptions adopted in AASHTO. A reliability analysis was conducted to quantify the reliability index for bridges designed using AASHTO procedures. To reach a consistent level of safety for one lane and two lane bridges, the live load factor in the design equation proposed by AASHTO LRFD needs to be revised by increasing the live load factor to 2.07 for one lane and 1.8 for two lanes. The results will provide structural engineers with more consistent provisions to design concrete slab bridges or evaluate the load-carrying capacity of existing bridges.

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Finite-Element Analysis of Steel Girder Highway Bridges

Cited by 98 publications

References 2 publications

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

İntegral Köprülerde Hareketli Yükler Altında Üstyapı Özelliklerinin Kazık Kuvvetlerine Etkisi

Effect of Edge Stiffening and Diaphragms on the Reliability of Bridge Girders

Reliability Analysis of Reinforced Concrete Slab Bridges

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