Field Measurements of Muskwa River Bridge

Dilger, Walter H.; Ghali, Amin; Cheung, Mo Shing; Beauchamp, J.C.

doi:10.1061/jsdeag.0005814

Cited by 9 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Churchward and Yehuda (1981) continuously recorded the temperature of a post-stressed twin box concrete bridge and presented an analytical expression of the vertical temperature profile as a function of the maximum differential temperature and environmental parameter insolation. A long-term field measurement was conducted by Dilger et al (1981) to investigate the thermal effects on a continuous, steel-concrete composite box girder bridge during its construction and its first three years of operation.…”

Section: Introductionmentioning

confidence: 99%

Temperature Analysis of a Long-Span Suspension Bridge Based on Field Monitoring and Numerical Simulation

et al. 2016

View full text Add to dashboard Cite

Structural temperature is an important form of loading for bridges, particularly for long-span steel structures. In this study, the temperature distribution of the Humber Bridge in United Kingdom is investigated based on numerical simulation and field measurements. A 2D fine finite element (FE) model of a typical section of the box girder of this long-span suspension bridge is constructed. The time-dependent thermal boundary conditions are determined based on the field meteorological measurements with external surface heat convection coefficients varying according to differing local wind speeds they experience. Pre-analysis is adopted to determine the initial thermal condition of the model, then transient heat-transfer analysis is performed and the time-dependent temperature distribution of the bridge is obtained leading to numerical temperature data at different locations in different time that are in good agreement with the measured counterparts. The vertical and transversal temperature differences of the box girder are also investigated. Both measured and numerical results show that the transversal temperature variation across the streamlined girder is significant. The effects of the box girder shape, pavement of the upper webs, and bridge orientation on the transversal temperature difference are finally investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Temperature Analysis of a Long-Span Suspension Bridge Based on Field Monitoring and Numerical Simulation

et al. 2016

View full text Add to dashboard Cite

show abstract

Experimental and finite element investigation of temperature distributions in concrete-encased steel girders

Abid

Mussa

Tayşi

et al. 2017

Struct Control Health Monit

View full text Add to dashboard Cite

SummaryThe structural performance of bridge structures is temporal and is mainly controlled by the types of the applied loads. To continuously observe the structural performance of bridges, structural health monitoring sensors that include among many temperature sensors are used. The impact of nonuniform temperature distributions in bridge girders due to the environment thermal loads has been recognized by former researchers and bridge design codes. To evaluate these and other effects on the structural behavior of bridge structures, many field and experimental structural health monitoring studies were carried out. However, more researches are required to investigate the temperature distributions in other girder configurations. This work is directed to investigate the impact of air temperature and solar radiation on temperature gradient distributions in concrete-encased composite girders. For this purpose, an experimental concrete-encased steel girder segment was instrumented with thermocouples and other sensors. The experimental data recording continued for 6 months during the hot and cold seasons. Furthermore, a thermal finite element (FE) parametric study was conducted to investigate the effect of the girder size. The test results showed that the vertical and lateral temperature gradient distributions and the variation of the temperature gradients with time are controlled by the amount and location of the received solar radiations. The FE analysis showed that the daily temperature variations are higher in smaller girders, whereas the temperature gradients are smaller than in larger girders. Moreover, the FE results showed that the thickness of the girder's concrete members has an important impact on temperature gradients and temperature distributions.

show abstract

Environmental-effects-embedded model updating method considering environmental impacts

Zhou

Song

2017

Struct Control Health Monit

View full text Add to dashboard Cite

Summary In structural health monitoring, one practical challenge is to separate the change of structural characteristics (e.g., natural frequency and mode shape) due to environmental impacts from those induced by actual damage. Generally, data‐driven regression models are applied to remove the environmental impacts before model updating takes place. Model selection and training procedures are required in constructing these regression models, which are often subjective, prone to overfitting issue, and human errors. This paper proposes a novel physics‐based Environmental‐Effects‐Embedded model updating method. By embedding physical mechanisms of environmental impacts into the formulation of the finite element model, the proposed method is capable of considering these impacts during the finite element model updating. A comparative numerical study is performed by applying both the Environmental‐Effects‐Embedded model updating method and traditional method on a pedestrian bridge model subjected to structural damage, temperature variation, and boundary condition change. Comparison between the proposed and traditional methods has demonstrated that the proposed method can offer more accurate results in localizing and quantifying the structural damage under environmental impacts.

show abstract

Field Measurements of Muskwa River Bridge

Cited by 9 publications

References 0 publications

Temperature Analysis of a Long-Span Suspension Bridge Based on Field Monitoring and Numerical Simulation

Temperature Analysis of a Long-Span Suspension Bridge Based on Field Monitoring and Numerical Simulation

Experimental and finite element investigation of temperature distributions in concrete-encased steel girders

Environmental-effects-embedded model updating method considering environmental impacts

Contact Info

Product

Resources

About