Evaluation of bridge exterior girder rotation during construction

2019 ◽  
Vol 187 ◽  
pp. 149-160
Author(s):  
Faress Hraib ◽  
Li Hui ◽  
Miguel Vicente ◽  
Riyadh Hindi
Keyword(s):  
Exterior Girder

INFLUENCE OF SPAN LENGTH AND CROSSBEAM ON LOAD DISTRIBUTION FACTOR FOR GIRDER BRIDGES

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Hyo-Gyoung Kwak ◽  
Joungrae Kim
Keyword(s):  
Finite Element ◽  
Load Distribution ◽  
Span Length ◽  
Distribution Factor ◽  
Steel Girder ◽  
Girder Bridges ◽  
Load Distribution Factor ◽  
Exterior Girder ◽  
Grillage Method ◽  
Concrete Girder

Load distribution factor at concrete girder bridges and steel girder bridges are analyzed with finite element method to see effect of span length and cross beam to load distribution factor. Span lengths of analyzed bridge models are 30m, 40m, 50m and 60m. The number of intermediate cross beam is increased from one to until distance between cross beams becomes 5m. The finite element analysis results show that concrete girder and steel girder can use same load distribution factor and span length doesn’t affect to load distribution factor. Even though load distribution factor in interior girders is not influenced by cross beam, in exterior girders it is influenced by cross beam. Effect of cross beam in exterior girder is influenced by the number of lanes and distance from exterior girder to curb. Since design code introduces conservative load distribution factor, economically improved load distribution factor is proposed. The proposed load distribution factor includes cross beam effect with the number of lanes and distance from exterior girder to curb. The proposed equation is compared with AASHTO code and grillage method which is well-known method to calculate load distribution. The comparison results showed that the proposed equation is more efficient and useful than AASHTO and safer than the grillage method.

A Simplified method to minimize exterior girder rotation of steel bridges during deck construction

2019 ◽  
Vol 183 ◽  
pp. 84-93 ◽  
Author(s):  
Li Hui ◽  
Faress Hraib ◽  
Brandon Gillis ◽  
Miguel Vicente ◽  
Riyadh Hindi
Keyword(s):  
Steel Bridges ◽  
Simplified Method ◽  
Exterior Girder

Effect of Inconsistent Diaphragms on Exterior Girder Rotation During Overhang Deck Construction

Structures ◽  
2016 ◽  
Vol 8 ◽  
pp. 25-34 ◽  
Author(s):  
Md Ashiquzzaman ◽  
Li Hui ◽  
Ahmed Ibrahim ◽  
Will Lindquist ◽  
Mark Thomson ◽  
...  
Keyword(s):  
Exterior Girder

Exterior girder rotation of skew and non-skew bridges during construction

2020 ◽  
Vol 24 (1) ◽  
pp. 134-146
Author(s):  
Md Ashiquzzaman ◽  
Li Hui ◽  
Ahmed Ibrahim ◽  
Will Lindquist ◽  
Nader Panahshahi ◽  
...  
Keyword(s):  
Detailed Comparison ◽  
Construction Operations ◽  
Steel Girder ◽  
Factors Affecting ◽  
Girder Bridges ◽  
Steel Girder Bridges ◽  
Live Loads ◽  
Construction Loads ◽  
Unbalanced Loads ◽  
Exterior Girder

In bridge design, bridge decks regularly overhang past the exterior girders in arrange to extend the width of the deck whereas constraining the specified number of girders. The overhanging part of the deck comes about in uneven eccentric loads to the exterior girders which are by and large most prominent. These eccentric loads are primarily a result of bridge construction operations as well as the weight of new concrete and other construction live loads. These unbalanced loads can lead to a differential edge deflection of overhang deck and a rotation of the exterior girders. The girder rotation or differential deck deflection can also affect local and global stability of the entire bridge. The objective of this study is to enhance the knowledge and understanding of external girder behavior due to unbalanced eccentric construction loads and to identify the critical factors affecting their rotation. In this article, field data obtained during the construction of two skewed (one with a small skew (3.8°) and the second with a severe skew (24°)) and one non-skewed steel girder bridges are described, and a detailed comparison is presented. The three bridges experienced maximum outward exterior girder rotation during construction which subsequently decreased following construction operations. The field results were used to validate and calibrate the finite element models. The numerical and field-monitored data showed good agreement and can be used to assist bridge designers and construction engineers to design appropriate systems to limit girder rotation during construction.

scholarly journals Analysis and Design of Fly Over

2021 ◽  
Vol 1197 (1) ◽  
pp. 012048
Author(s):  
G Harsha Vardhan ◽  
A. Venkateswara Rao
Keyword(s):  
Prestressed Concrete ◽  
Bending Moment ◽  
Concrete Bridges ◽  
Background Information ◽  
Infrastructure Development ◽  
Analysis And Design ◽  
Aesthetic Appearance ◽  
Bridge Structures ◽  
Grillage Analysis ◽  
Exterior Girder

Abstract Bridges remain the key components in any road network for infrastructure development. For use of prestress girder type bridges become popular for the reason that of its stability, economy, serviceability, aesthetic appearance and structural competence. The grillage analysis method for analysing bridge structures has been in use. In this work, an attempt is made to provide advise on grillage idealisation of the structure, as well as background information. The mesh layout is explained in detail. Analysis of proposal of prestressed concrete bridges are carried out using relevant IRC codes and IS codes. The bridge deck is analysed by grillage analysis. The present work was accepted out to exterior girder of span 28.2 m, width 12.5 m and with thickness of slab as 0.225m. The members are designed for maximum shear forces & bending moment. Losses of stress due to friction, anchorage slip, elastic shortening concrete & relaxation of stress in steel are also considered. The analysis has analysed by STAAD PRO software

Effectiveness of different bracing systems to prevent exterior girder rotation during bridge deck construction

2017 ◽  
Vol 142 ◽  
pp. 272-289 ◽  
Author(s):  
Md Ashiquzzaman ◽  
Carlos Merino Calvo ◽  
Li Hui ◽  
Ahmed Ibrahim ◽  
Will Lindquist ◽  
...  
Keyword(s):  
Bridge Deck ◽  
Exterior Girder

scholarly journals Analytical Solutions for Girder Distribution Factor in Steel-Concrete Composite Girders with the Effect of Parapets

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Zejun Zhang ◽  
Yongjian Liu ◽  
Bowen Feng ◽  
Yinping Ma ◽  
Guojing Zhang
Keyword(s):  
Field Test ◽  
Great Influence ◽  
Fe Model ◽  
Distribution Factor ◽  
Continuous Layer ◽  
Composite Girder ◽  
Simplified Method ◽  
Girder Bridge ◽  
Aashto Lrfd ◽  
Exterior Girder

The existing studies have shown that parapets have great influence on the girder distribution factor (GDF) of bridges. However, there is no method in the design guide to estimate the GDF considering the effect of parapets. This research aims to develop a simplified method for estimating the GDF by considering the effect of parapets. First, a simply supported steel-concrete composite girder bridge was tested to investigate the effect of parapets on the GDF. Then, finite-element (FE) model was established and verified by the field test data of strain and deflection. In addition, error study showed that the bending stiffness of the bridge was increased by about 92% and 19.1%, respectively, due to the effects of parapet and continuous layer. As the effect of the continuous layer on each girder was relatively uniform, the simplified method was optimized only considering the effect of the parapet. Finally, the effect of the parapet on the GDF was compared and discussed. Considering the effect of the parapet, the GDF of the exterior girder calculated by the simplified method and FE analysis decreased by about 26.92% and 23.53%, respectively, and the adjacent interior girder decreased by about 15.22% and 12.77%, respectively. Comparing the GDF calculated by the AASHTO LRFD specifications, the GDF calculated by the simplified method decreased by about 30.77% in the exterior girder and 41.30% in the interior girder, respectively. The results indicate that the method of calculating the GDF without considering the effect of the parapet in AASHTO LRFD specifications is conservative. The GDF calculated by the simplified method was basically close to the field test results, meaning that the proposed simplified method considering the effect of the parapet was relatively accurate.

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