Grillage analogy applications in analysis of bridge decks

Sadeghi, Javad; Fathali, Masoud

doi:10.7158/c10-670.2012.10.1

Cited by 4 publications

(4 citation statements)

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“…The distributions of the shear forces, moment and torques are distributed in two directions, as the deck plane is continuous in two dimensions. Since these distributions are complex in nature, it is simpler to simplify this distributing into one-dimensional beams, as shown in Figure 2.11 (Sadeghi & Fathali, 2012).…”

Section: Grillage Methodsmentioning

confidence: 99%

Structural Behaviour of Shear-Connected Adjacent Precast Concrete Box Beam Bridges Subjected to AASHTO Truck Loading

Sennah

2023

Preprint

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<p>Shear-connected box beam bridges have been extensively used in North America for their reduction in construction times and life cycle cost. Literature review revealed that the applied transverse vertical shear force, Vy, required to design the shear keys between beams subjected to AASHTO truck loading is yet unavailable. As such, a parametric study was carried out, using the Orthotropic Plate Theory, to obtain reliable Vy to design the shear keys. Although AASHTO-LRFD Bridge Design Specifications provide equations for the fraction of truck loading carried by box beams, these equations do not cover the case of one-lane bridge cross-section, nor the effect of the concrete traffic barrier, built integrally with the exterior box beams. Therefore, a parametric study was conducted to determine the fraction of truck loading carried by the beams to evaluate such equations. The key parameters in the parametric study included bridge span and width, cross-sectional geometric properties, truck loading conditions and barrier stiffness. Results led to the development of design charts for Vy values in addition to alternative empirical equations. The study on the fraction of truck loading carried by beams showed that AASHTO-LRFD equations are conservative for bridges of two and more traffic lanes but not for one-lane bridges. As such, an empirical equation was developed for such bridge configuration. The study also showed that the fraction of truck loading carried by beams decreases significantly due to barrier stiffness. Thus, empirical equations for the effect of the barrier were deduced to assist engineers in economical design of new bridges and bridge rating.</p>

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Section: Grillage Methodsmentioning

confidence: 99%

Structural Behaviour of Shear-Connected Adjacent Precast Concrete Box Beam Bridges Subjected to AASHTO Truck Loading

Sennah

2023

Preprint

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“…Due to the diversity of bridge structure and support forms, it is difficult to generalize the unified principle for all types of bridge grillage division. For box girder bridge grillage division, domestic and foreign researchers have done a lot of research, and obtained the corresponding division principle, summarized as follows [7][8][9]:…”

Section: Basic Principles Of Grillage Division With Non-standard Bmentioning

confidence: 99%

Numerical Simulation Study of Non-standard Prestressed Concrete Continuous Box Girder Bridge

Xu¹,

Gu²,

Fu³

2019

Proceedings of the 2019 International Conference on Mathematics, Big Data Analysis and Simulation and Modelling (MBDASM 2019)

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This paper summarizes the stress characteristics of non-standard box girders and the grillage method, and according to the engineering practice experience, summarizes the characteristics of the grillage method in the stress analysis of nonstandard box girders, and draws the corresponding conclusions. On this basis, the finite element models of the special-shaped bifurcated box girder and the widened box girder are established respectively. According to the analysis results and the operation of the bridge after completion, the grillage model can meet the needs of design checking calculation, provide theoretical basis for bridge construction, and it is worthy of reference for similar projects.

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“…Lu et al [5] validated the grillage model of a T-frame bridge using results obtained from field testing. Sadeghi and Fathali [6] compared vibration parameters of a grillage theoretical model with the experimental data and concluded that GA has a satisfactory degree of accuracy when the bridge loads do not exceed the allowable amount. Also, other similar studies collated grillage results with field testing data for bridge assessment [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modelling techniques for structural evaluation for bridge assessment

Jamali

Chan

Thambiratnam

2018

J Civil Struct Health Monit

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Load assessment of existing bridges in Australia is evaluated mainly using beam line model and the grillage analogy to examine the structural integrity of bridge components due to live loadings. With the majority of existing bridge networks designed for superseded design vehicular loading, the necessity to utilise more rigorous analysis methods to assess the load effects of bridges is indispensable. In this paper, various vehicular loading cases on a grillage model of a box girder bridge and its equivalent finite element model (FE) are considered, and their applicability for bridge assessment using structural health monitoring (SHM) as defined in the new revision of AS 5100.7 is studied. Based on numerical analyses, it was observed that component-level load effects in the two models have notable differences, irrespective of vehicle speed, position and loading. However, when global-level load responses are compared, the discrepancy in analysis outputs drops dramatically. The modelling ratios developed in this paper are practical and will be applicable with any modelling techniques for bridge assessment under vehicular loading on both a global and component-response basis. It was also observed that FE is more efficient in terms of model updating and damage simulation, and hence more appropriate for implementation of SHM techniques. The proposed flowchart suggested for heavy load assessment incorporates detailed and simple modelling approaches aligned with experimental data obtained by SHM techniques, which can be used for periodic and long term monitoring of bridges. It can enhance the proper determination of bridge condition states, as any conservative estimation of bridge capacity may result in unnecessary load limitations.

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Grillage analogy applications in analysis of bridge decks

Cited by 4 publications

References 0 publications

Structural Behaviour of Shear-Connected Adjacent Precast Concrete Box Beam Bridges Subjected to AASHTO Truck Loading

Structural Behaviour of Shear-Connected Adjacent Precast Concrete Box Beam Bridges Subjected to AASHTO Truck Loading

Numerical Simulation Study of Non-standard Prestressed Concrete Continuous Box Girder Bridge

Modelling techniques for structural evaluation for bridge assessment

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