Response of Continuous System with Stochastically Varying Surface Roughness to Moving Load

Schenk, Christian A.; Bergman, Lawrence A.

doi:10.1061/(asce)0733-9399(2003)129:7(759)

Cited by 21 publications

(11 citation statements)

References 11 publications

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Section: Flatnessmentioning

confidence: 99%

“…Flatness is a condition where a surface has all its elements in one plane [94], which indicates a condition of being completely a planar surface. When a flatness control is applied to a surface, it demonstrates the amount of deviation in flatness that a surface is allowed to have [94]. When the flatness of a component is critical, such as the whole or part of a floor surface, the flatness control is applied [92], regardless of the thickness, the size dimension, or other features that may also be specified [17].…”

Section: Flatnessmentioning

confidence: 99%

See 1 more Smart Citation

Deploying Geometric Dimensioning and Tolerancing in Construction

Talebi¹,

Koskela²,

Tzortzopoulos³

et al. 2020

Buildings

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No standardised approach appears to exist in the architecture, engineering, and construction (AEC) industry for the communication of tolerance information on drawings. As a result of this shortcoming, defects associated with dimensional and geometric variability occur with potentially severe consequences. In contrast, in mechanical engineering, geometric dimensioning and tolerancing (GD&T) is a symbolic language widely used to communicate both the perfect geometry and the tolerances of components and assemblies. This paper prescribes the application of GD&T in construction with the goal of developing a common language called geometric dimensioning and tolerancing in construction (GD&TIC) to facilitate the communication of tolerance information throughout design and construction. design science research is the adopted methodological approach. Evidence was collated from direct observations in two construction projects and two group interviews. A focus group meeting was conducted to evaluate whether the developed solution (GD&TIC) fulfilled its aim. The contribution of this paper to designers, to organisations involved in developing AEC industry standards, and to the scholarly community is twofold: (1) It is an attempt to develop a standardised approach (GD&TIC) for the communication of tolerance information in AEC, and (2) it identifies discrepancies between GD&TIC rules and some of the commonly used American and British standards on tolerances.

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Section: Flatnessmentioning

confidence: 99%

Section: Flatnessmentioning

confidence: 99%

Deploying Geometric Dimensioning and Tolerancing in Construction

Talebi¹,

Koskela²,

Tzortzopoulos³

et al. 2020

Buildings

View full text Add to dashboard Cite

show abstract

“…When a vehicle traverses a short-to mid-span highway bridge, which is usually rather rigid with, for example, concrete box-girders, the bridge-vehicle system can be sufficiently decoupled to a beam moving-force model (Cebon, 1999;Pan and Li, 2002;Pesterev et al, 2003;Pesterev et al, 2004;Schenk and Bergman, 2003;Yang et al, 2000), i.e., the bridge (modeled as an elastic beam) is subjected to a time-variant tire force ( ) P t moving across it. In this paper, ( ) P t is taken as a constant P for each of the passing vehicles, which accounts for the static tire force, or the weight of the vehicle.…”

Section: Modeling and Problem Formulationmentioning

confidence: 99%

A video assisted approach for structural health monitoring of highway bridges under normal traffic

et al. 2006

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Structural condition assessment of highway bridges is traditionally performed by visual inspections or nondestructive evaluation techniques, which are either slow, unreliable or detects only local flaws. Instrumentation of bridges with accelerometers and other sensors, however, can provide real-time data useful for monitoring the global structural conditions of the bridges due to ambient and forced excitations. This paper reports a video-assisted approach for structural health monitoring of highway bridges, with results from field tests and subsequent offline parameter identification. The field tests were performed on a short-span instrumented bridge. Videos of vehicles passing by were captured, synchronized with data recordings from the accelerometers. For short-span highway bridges, vibration is predominantly due to traffic excitation. A stochastic model of traffic excitation on bridges is developed assuming that vehicles traversing a bridge (modeled as an elastic beam) form a sequence of Poisson process moving loads and that the contact force of a vehicle on the bridge deck can be converted to equivalent dynamic loads at the nodes of the beam elements. Basic information of vehicle types, arrival times and speeds are extracted from video images to develop a physics-based simulation model of the traffic excitation. This modeling approach aims at circumventing a difficulty in the system identification of bridge structural parameters. Current practice of system identification of bridge parameters is often based on the measured response (or system output) only, and knowledge of the input (traffic excitation) is either unknown or assumed, making it difficult to obtain an accurate assessment of the state of the bridge structures. Our model reveals that traffic excitation on bridges is spatially correlated, an important feature that is usually incorrectly ignored in most output-only methods. A recursive Bayesian filtering is formulated to monitor the evolution of the state of the bridge. The effectiveness and viability of this video-assisted approach are demonstrated by the field results.

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“…It has been shown that, for short-to mid-span concrete highway bridges, in the normal range of vehicle speeds, large dynamic tire forces are due mainly to road surface irregularity, rather than bridge-vehicle interactions (Schenk and Bergman, 2003;Yang et al, 2000;Pesterev et al, 2003;Pesterev et al, 2004). As a result, decoupling the bridge-vehicle system leads to the moving load model, i.e.…”

Section: Beam-moving Load Modelmentioning

confidence: 99%

Physics-based traffic excitation models for highway bridges

Chen

Tan

Feng

2004

Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

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For long-term bridge health monitoring, structural dynamic properties are usually obtained by system identification based only on the system output (bridge vibration responses), because the system input (traffic excitation) is difficult to measure. To facilitate such identification the excitation is commonly assumed as spatially uncorrelated white noise. However, when physically modeling it as a stationary stream of moving forces traversing the bridge, whose arrivals at the bridge are in accordance with a Poisson process, the traffic excitation is found to be spatially correlated. In this paper a procedure for formulating the traffic excitation model based on its physics is proposed, which involves first converting the moving forces into equivalent nodal excitation time-histories by the dynamic nodal loading approach, and then applying the Campbell's theorem for the filtered Poisson processes. By this procedure, a non-diagonal frequency-variant excitation spectrum density matrix (SDM) is obtained. This does not conform to the conventional white noise excitation model. One of the output-only identification techniques based on the conventional excitation model, the frequency domain decomposition technique is implemented to demonstrate that direct application of the technique to traffic-induced vibrations can lead to misleading results. The proposed procedure for formulating the traffic excitation SDM provides a way to describe primary knowledge of the traffic excitation in frequency domain even for complicated bridges, which will potentially enable improvement in output-only identification techniques with unknown but spatially correlated excitation.

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Response of Continuous System with Stochastically Varying Surface Roughness to Moving Load

Cited by 21 publications

References 11 publications

Deploying Geometric Dimensioning and Tolerancing in Construction

Deploying Geometric Dimensioning and Tolerancing in Construction

A video assisted approach for structural health monitoring of highway bridges under normal traffic

Physics-based traffic excitation models for highway bridges

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