Live-Load Moment-Distribution Factors for an Adjacent Precast Prestressed Concrete Box Beam Bridge with Reinforced UHPC Shear Key Connections

Semendary, Ali A.; Steinberg, Eric P.; Walsh, Kenneth K.; Barnard, Elné

doi:10.1061/(asce)be.1943-5592.0001127

Cited by 19 publications

(12 citation statements)

References 20 publications

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“…Gheitasi and Harris [8] show an overestimation of the stresses obtained when using the LDF quantified as 125% for interior girders and greater than 300% for exterior girders. Likewise, Huang, Semendary and Razzaq [10][11][12][13][14][15][16][17][18][19][20][21][22] quantify the overestimation of the longitudinal bending stresses experienced by the girders obtained using the LDF method as 150%.…”

Section: Discussionmentioning

confidence: 99%

“…Structural grillage models [2][3][4] are commonly used to calculate the cross-sectional distribution of live loads between the different girders making up the cross section of the deck [5][6][7]. Another way to approach the design and calculation of such decks would be to apply different formulations [8][9][10] contained in the bridge design standards that approximate the cross-sectional distribution of the bending moment and shear stress caused by live loads through what is known as the load distribution factor (LDF) [11][12][13]. The LDF associated with each case study is conditioned by the type and number of girders, their spacing and length, and whether there are transverse diaphragms that provide the deck with transverse rigidity [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Gaute-Alonso

Calderon-Uriszar-Aldaca

Castillo

2022

Civ Eng J

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One of the main goals in the design of girder bridge deck systems is to determine the cross-sectional distribution of live loads across the different girders that make up the cross-section of the deck. Structural grillage models and current bridge design standards based on a Load Distribution Factor (LDF) provide oversized designs, as demonstrated in this paper. This research introduces a novel method that allows the cross-sectional distribution of live loads on girder bridge decks to be calculated by applying a matrix formulation that reduces the structural problem to 2 degrees of freedom for each girder: the deflection and the rotation of the deck-slab at the centre of the girder’s span. Subsequently, a parametric study is presented that analyses the structural response of 64 girder bridge decks to a total of 384 load states. In addition, the authors compare the outputs of the novel method with those obtained using traditional grillage calculation methods. Finally, the method is experimentally validated on two levels: a) a laboratory test that analyses the structural response of a small-scale girder bridge deck to the application of different load states; b) a real full-scale girder bridge load test that analyses the structural response of the bridge over the Barbate River during its static load test. Based on this analysis, the maximum divergence of the proposed method obtained from the experimental structural response is less than 10%. The use of the proposed novel analysis method undoubtedly provides significant savings in material resources and computing time, while contributing to minimizing overall costs. Doi: 10.28991/CEJ-2022-08-03-01 Full Text: PDF

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Gaute-Alonso

Calderon-Uriszar-Aldaca

Castillo

2022

Civ Eng J

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“…By determining the right side of equations (7) and (8) for the relative displacement, the tangent sti ness is as follows:…”

Section: Bonding Model Of Reinforcedmentioning

confidence: 99%

“…Box girder is an important type of bridge structure. For box girder, many scholars have conducted research on shear lag, effective width [1][2][3][4][5], and live load distribution factors [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Distribution Laws of Shear Force in Box Girder Webs

Xue

Zang

Zhou

et al. 2019

Advances in Materials Science and Engineering

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To study the shear force distribution laws of a box girder with a single-box multichamber (SB-MC) configuration for different supporting conditions, numbers of webs, stiffness of end diaphragm, and web thickness values, a box girder with SB-MC was numerically simulated using three-dimensional finite element model. According to the comparison results of web shear force, the concept of η, a shear-increased coefficient for webs, was introduced. The results show that supporting conditions and chambers have a significant impact on the shear-increased coefficient η, and end diaphragm must be set up in the 3D finite element model when calculating η. Nonlinear analysis shows that in the elastic phase, the shear-increased coefficient η basically does not change, but in the cracking stage, the coefficient η of each web changes with the degree of web cracking, and side-webs (S-Webs) reach the ultimate load first. The variation of the web thickness hardly affects the distribution of the shear force, so the method to adjust the web thickness of S-Web was proposed according to the result of shear-increased coefficient η to improve the shear resistance of the box girder.

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“…It is very common to use structural grillage models [2][3][4][5][6][7][8][9][10] to calculate the cross-sectional distribution of live loads between the different beams that make up the cross section of the deck. Another way to deal with the design and calculation of such decks would be to apply different formulations contained in the bridge design standards that allow approximating the cross-sectional distribution of the bending moment and shear stress caused by live loads through what is known as the load distribution factor "LDF" [11][12][13][14][15][16][17][18][19][20][21][22][23]. The "LDF" associated with each case study is conditioned by the type and number of beams, their spacing and length, as well as the existence or not of transverse diaphragms that bring transverse rigidity to the deck.…”

Section: Introductionmentioning

confidence: 99%

Perspective Chapter: Simplified Matrix Calculation for Analysis of Girder-Deck Bridge Systems

Gaute-Alonso¹

2022

Applied Methods in Design and Construction of Bridges, Highways and Roads - Theory and Practice

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In the design of girder-deck bridge systems, it is necessary to determine the cross-sectional distribution of live loads between the different beams that make up the cross section of the deck. This article introduces a novel method that allows calculating the cross-sectional distribution of live loads on beam decks by applying a matrix formulation that reduces the structural problem to 2 degrees of freedom for each beam: the deflection and the rotation of the deck slab at the center of the beam’s span. To demonstrate the proposed method, the procedures are given through three different examples by applying loads to a bridge model. Deflection, bending moment, and shear force of the bridge girders are calculated and discussed through the given examples. The use of the proposed novel method of analysis will result in significant savings in material resources and computing time and contributes in the minimization of total costs, and it contributes in the smart modeling process for girder bridge behavior analysis allowing to feed a bridge digital twin (DT) model based on Inverse Modeling holding the latest updated information provided by distributed sensors. The presented methodology contributes also to speed up real-time decision support system (DSS) demands.

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Live-Load Moment-Distribution Factors for an Adjacent Precast Prestressed Concrete Box Beam Bridge with Reinforced UHPC Shear Key Connections

Cited by 19 publications

References 20 publications

Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Numerical Investigation of Distribution Laws of Shear Force in Box Girder Webs

Perspective Chapter: Simplified Matrix Calculation for Analysis of Girder-Deck Bridge Systems

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