Procedures for the assessment of highway structures

O’Brien, Eugene J.; ?nidari?, A.; Brady, K C; Gonz�lez, A.; O’Connor, Alan

doi:10.1680/tran.158.1.17.57832

Cited by 5 publications

(8 citation statements)

References 5 publications

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“…These factors are derived from a probability-based analysis, thus the method is considered semiprobabilistic. 19,21 An advantage of this method is that it is simple to use, and is usually applied to the design of bridges, as well as assessment using the initial level of structural analysis. However, the PSFs for assessment must be taken from assessment codes, with calibration for existing bridges to the desired level of safety, because improved information about uncertainties is not always equivalent to that used by design standards.…”

Section: Psf Methodsmentioning

confidence: 99%

“…As well as the structural analysis, verification of the required level of structural safety can be carried out at several levels of increasingly complex approximation. [19][20][21] The general condition to determine the load-carrying capacity is given by:…”

Section: Safety Verificationmentioning

confidence: 99%

“…However, before progressing from an initial level to enhanced levels of structural analysis or from a concept based on PSFs to a full probabilistic analysis, assessment using in situ tested material properties is recommended. Such parameters are required for these improved analyses; see Bagge et al 14 and O'Brien et al, 21 respectively. • The PSFs can be used at initial level of structural assessment (and for comparison at enhanced level) and can be used for the actions in combination with the GRSF method or the full probabilistic method for resistance.…”

Section: Successively Improved Assessmentmentioning

confidence: 99%

“…Analysis with site-specific loads can also be an intermediate step before proceeding from a concept, based on PSFs applied to actions (regardless the safety concept used for the resistance), to the full probabilistic analysis including both resistance and actions. 21 • The actual bridge geometry and eventual defects should be taken into account, regardless of the level of structural analysis and the method of safety verification. • It is important to verify assumptions in the structural analysis (e.g., associated with boundary conditions), and thus testing of the bridge's structural behavior is relevant for all levels of structural assessment.…”

Section: Successively Improved Assessmentmentioning

confidence: 99%

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Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

Bagge

2019

Structural Concrete

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Assessing the load‐carrying capacity of existing bridges is an important infrastructure management task. In order to support the structural assessment of concrete bridges better, a procedure has been proposed, based on successively improving the bridge analysis. A multilevel strategy for structural analysis has been combined with concepts for verification of the desired safety margin, thus providing tools for engineers to model the structural behavior of bridges more accurately when necessary. This paper describes the procedure as applied to a prestressed concrete girder bridge, with use of experiences from the previous failure tests and associated evaluations of the bridge. Initial structural assessment indicated the critical failure mode to be due to shear in one of the girders; however, the enhanced analysis showed a complex failure involving both the girder and the bridge deck slab. Improving the structural analysis using nonlinear FE analysis for the loading initially identified as critical, increased the permitted axle loads on the bridge to 12 to 14 times those given by traditional and standardized assessment methods, depending on the concept used for safety verification. The model uncertainty was crucial for the verification of the structural safety and has to be properly taken into account. However, there are few recommendations, with regard to model uncertainties, on the application of nonlinear FE analysis, and detailed guidelines should be used for the modeling procedure in order to reduce analyst‐dependent variability in the results. The presented study demonstrates the applicability and the advantages of using the proposed procedure for successively improved analysis for bridge assessment.

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Section: Psf Methodsmentioning

confidence: 99%

Section: Safety Verificationmentioning

confidence: 99%

Section: Successively Improved Assessmentmentioning

confidence: 99%

Section: Successively Improved Assessmentmentioning

confidence: 99%

See 2 more Smart Citations

Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

Bagge

2019

Structural Concrete

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“…This theory becomes more likely to be applied by the end of 1970s thanks to the pioneering work of Cornell et al [2]. Structural reliability analysis is now the most sophisticated level of assessment of highway structures [3].…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Reliability Analysis of Reinforced-Concrete Bridges Under the Combined Effect of Corrosion, Creep and Shrinkage

Chehade

Younès

Mroueh

et al. 2017

WIT Transactions on the Built Environment

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This paper proposes a methodology for the time-dependent reliability assessment of reinforced-concrete bridges, taking into account the combined effect of steel corrosion due to the aggressive environment, creep and shrinkage under realistic traffic. For this purpose, traffic is simulated over time according to weight in motion, data recorded in Europe, then time-dependent deflection is calculated by considering the cyclic creep effect due to traffic load in addition to shrinkage and tension stiffening. So, the time-dependent bending moment can be deduced using the finite element method; this moment is then introduced into the limit state function with the nominal resistance (flexure) which decreases over time due to the reduction of steel section under corrosion, the reliability index and the probability of failure are then calculated using the first-order reliability method. This procedure is illustrated through an example for a simply supported reinforced-concrete bridge.

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Damage detection and calibration from beam–moving oscillator interaction employing surface roughness

Jaksic

Connor

Pakrashi

2014

Journal of Sound and Vibration

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The possibility of employing bridge deck surface roughness for Structural Health Monitoring (SHM) under operational conditions is proposed in this paper. A bilinear breathing crack in a damaged Euler Bernoulli beam traversed by a moving oscillator is considered in this regard. The Road Surface Roughness (RSR) of the beam is classified as per ISO 8606:1995(E). The interaction of the moving oscillator with surface roughness is exploited to define simple, consistent, easy to implement and robust statistical descriptors to detect and calibrate the existence, the location and the extent of damage. The effects of vehicle speed and variable RSR profiles for such detection are investigated and preferable conditions for detection are identified. The proposed method is also 2 suitable for experimental analysis where a theoretical model is not available or is not credibly ascertained.

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Procedures for the assessment of highway structures

Cited by 5 publications

References 5 publications

Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges

Time-Dependent Reliability Analysis of Reinforced-Concrete Bridges Under the Combined Effect of Corrosion, Creep and Shrinkage

Damage detection and calibration from beam–moving oscillator interaction employing surface roughness

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