Live Load Distribution Factors for Skew Stringer Bridges with High-Performance-Steel Girders under Truck Loads

Mohseni, Iman; Cho, Yong; Kang, Junsuk

doi:10.3390/app8101717

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The results of studies carried out by Hughs & Idriss [13] showed that LLDFs calculated by the equations given in AASHTO are conservative compared to the results of FE analyses. More recently, research on LLDF has considered specific bridge systems with longitudinal beams [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A New Proposal for Live Load Distribution Factors of Bridges with Transverse Beams

Abrishamkar¹,

Kholghi²,

Maleki³

2022

J. Civ. Eng. Constr.

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Many bridge superstructures use transverse beams as load carrying components. In these systems, usually the transverse beams are connected to the main longitudinal girders or trusses on the two sides of the bridge. Such systems are commonly used in plate girder, box girder, cable-stayed and truss bridges. The live load distribution factor (LLDF) for bridge superstructures with transverse beams in AASHTO-LRFD bridge design specification has remained unchanged for decades and is prescribed as a function of the distance between the transverse beams. However, for slab-beam superstructures in which longitudinal beams at close spacing carry the loads to the substructure, the LLDFs have gone through many changes throughout the years and in their current forms depend on many parameters such as concrete slab thickness, beam span, longitudinal beam stiffness as well as the distance between the longitudinal beams. This study investigates the factors affecting the LLDF for transverse beams and intends to obtain new equations similar to AASHTO’s longitudinal beam equations. For this purpose, 3D finite element models of different sample bridges were developed and critical parameters affecting the LLDF were identified and varied. Accordingly, the LLDFs for moment and shear forces of transverse beams were obtained through regression analyses. The proposed equations have less than 3.1% of average error for the cases considered.

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Section: Introductionmentioning

confidence: 99%

A New Proposal for Live Load Distribution Factors of Bridges with Transverse Beams

Abrishamkar¹,

Kholghi²,

Maleki³

2022

J. Civ. Eng. Constr.

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“…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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