Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges
The main objective of this study is to make a comparison between calculating live load distribution factors using AASHTO-LRFD equations and the finite element analysis of precast concrete U-girder bridges. The AASHTO-LRFD specifications provide empirical equations for calculating the distribution fa...
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Semnan University
2024-11-01
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| Series: | Journal of Rehabilitation in Civil Engineering |
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| Online Access: | https://civiljournal.semnan.ac.ir/article_8674_26256f7b70ace531bbceaed5a24d910a.pdf |
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| author | Kamel Kamel Ahmed Amer Ahmed Hanafi |
| author_facet | Kamel Kamel Ahmed Amer Ahmed Hanafi |
| author_sort | Kamel Kamel |
| collection | DOAJ |
| description | The main objective of this study is to make a comparison between calculating live load distribution factors using AASHTO-LRFD equations and the finite element analysis of precast concrete U-girder bridges. The AASHTO-LRFD specifications provide empirical equations for calculating the distribution factors. Little information is available regarding the accuracy of these equations for this kind of bridge girder. As a result, an extensive parametric study was carried out using finite element modelling to evaluate the parameters that influence the live load distribution factors and to verify the accuracy of the AASHTO-LRFD equations to calculate these factors. The parameters considered in this study were bridge span, girder spacing, number of girders, and number of lanes. 52 prototype bridges were analysed using CSI Bridge software to determine moment and shear distribution factors due to the effect of the AASHTO-LRFD live load model (HL-93). All of the bridges studied were assumed to have straight and simply supported spans. According to the study''s results, the length of the girder does not affect the LLDF, while the parameters of the distance between girders, girder count, and lane count have a significant impact. In most cases, the AASHTO equations overestimate the calculated moment and shear distribution factors. Especially for wide bridges, the parametric study found that the difference between AASHTO equations and FEA results for calculating shear distribution factors was 87%. Consequently, it is best to avoid using these equations on wide bridges. |
| format | Article |
| id | doaj-art-5929eb11c4c84971bdb19a8a72be57eb |
| institution | Kabale University |
| issn | 2345-4415 2345-4423 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Semnan University |
| record_format | Article |
| series | Journal of Rehabilitation in Civil Engineering |
| spelling | doaj-art-5929eb11c4c84971bdb19a8a72be57eb2025-01-21T20:47:45ZengSemnan UniversityJournal of Rehabilitation in Civil Engineering2345-44152345-44232024-11-0112410311510.22075/jrce.2024.32025.19118674Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder BridgesKamel Kamel0Ahmed Amer1Ahmed Hanafi2Department of Civil Engineering, Obour High Institute for Engineering and Technology, Cairo, EgyptDepartment of Civil Engineering, Elgazeera High Institute for Engineering, Cairo, EgyptDepartment of Civil Engineering, Faculty of Engineering, Cairo University, Giza, EgyptThe main objective of this study is to make a comparison between calculating live load distribution factors using AASHTO-LRFD equations and the finite element analysis of precast concrete U-girder bridges. The AASHTO-LRFD specifications provide empirical equations for calculating the distribution factors. Little information is available regarding the accuracy of these equations for this kind of bridge girder. As a result, an extensive parametric study was carried out using finite element modelling to evaluate the parameters that influence the live load distribution factors and to verify the accuracy of the AASHTO-LRFD equations to calculate these factors. The parameters considered in this study were bridge span, girder spacing, number of girders, and number of lanes. 52 prototype bridges were analysed using CSI Bridge software to determine moment and shear distribution factors due to the effect of the AASHTO-LRFD live load model (HL-93). All of the bridges studied were assumed to have straight and simply supported spans. According to the study''s results, the length of the girder does not affect the LLDF, while the parameters of the distance between girders, girder count, and lane count have a significant impact. In most cases, the AASHTO equations overestimate the calculated moment and shear distribution factors. Especially for wide bridges, the parametric study found that the difference between AASHTO equations and FEA results for calculating shear distribution factors was 87%. Consequently, it is best to avoid using these equations on wide bridges.https://civiljournal.semnan.ac.ir/article_8674_26256f7b70ace531bbceaed5a24d910a.pdflive load distribution factorsaashto specificationsfinite element analysisu-girder bridges |
| spellingShingle | Kamel Kamel Ahmed Amer Ahmed Hanafi Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges Journal of Rehabilitation in Civil Engineering live load distribution factors aashto specifications finite element analysis u-girder bridges |
| title | Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges |
| title_full | Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges |
| title_fullStr | Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges |
| title_full_unstemmed | Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges |
| title_short | Comparison between Calculating Live Load Distribution Factors by AASHTO-LRFD Equations and Finite Element Method of Precast Concrete U-Girder Bridges |
| title_sort | comparison between calculating live load distribution factors by aashto lrfd equations and finite element method of precast concrete u girder bridges |
| topic | live load distribution factors aashto specifications finite element analysis u-girder bridges |
| url | https://civiljournal.semnan.ac.ir/article_8674_26256f7b70ace531bbceaed5a24d910a.pdf |
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