scholarly journals Temperature Field Boundary Conditions and Lateral Temperature Gradient Effect on a PC Box-Girder Bridge Based on Real-Time Solar Radiation and Spatial Temperature Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5261
Author(s):  
Xiao Lei ◽  
Xutao Fan ◽  
Hanwan Jiang ◽  
Kunning Zhu ◽  
Hanyu Zhan
Keyword(s):  
Temperature Distribution ◽  
Temperature Gradient ◽  
Solar Radiation ◽  
Prediction Model ◽  
Monitoring Data ◽  
Radiation Boundary Condition ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Lateral Temperature

Climate change could impose great influence on infrastructures. Previous studies have shown that solar radiation is one of the most important factors causing the change in temperature distribution in bridges. The current temperature distribution models developed in the past are mainly based on the meteorological data from the nearest weather station, empirical formulas, or the testing data from model tests. In this study, a five-span continuous Prestressed-concrete box-girder bridge was instrumented with pyranometers, anemometers, strain gauges, displacement gauges, and temperature sensors on the top and bottom slabs and webs to measure the solar radiation, wind speeds, strain, displacement, and surface temperatures, respectively. The continuously monitoring data between May 2019 and May 2020 was used to study the temperature distributions caused by solar radiation. A maximum positive lateral temperature gradient prediction model has been developed based on the solar radiation data analysis. Then, the solar radiation boundary condition obtained from the monitoring data and the lateral temperature gradient prediction model were utilized to compute the tensile stresses in the longitudinal and transverse directions. It was demonstrated in this study that the tensile stress caused by the lateral temperature gradient was so significant that it cannot be ignored in structural design.

Research of Temperature Field of Long Span Concrete Box Girder Bridge Caused by Solar Radiation

2012 ◽  
Vol 256-259 ◽  
pp. 1635-1639
Author(s):  
Cun Ren Jiang ◽  
Jian Min Ren ◽  
Zhuo Ling Wang
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Solar Radiation ◽  
Structure Design ◽  
Box Girder ◽  
Qinghai Province ◽  
Long Span ◽  
Concrete Box Girder ◽  
Girder Bridge ◽  
Bottom Slab

When stimulate temperature field of concrete box girder caused by solar radiation with ANSYS, it’s feasible to turn boundary conditions to third boundary condition. Taking Ping'an Huangshui River Super-large Bridge in Qinghai Province for example, the research analyzes box girder temperature field distribution and deduces realistic temperature gradient mode by comparing calculations with measurements. Calculations show that bottom slab of box girder also has quite big temperature gradient which should be taken seriously in bridge structure design.

Effect of encased concrete on section temperature gradient of corrugated steel web box girder

2021 ◽  
pp. 136943322199249
Author(s):  
Feng Zhang ◽  
Jia Shen ◽  
Jinyi Liu
Keyword(s):  
Temperature Gradient ◽  
Solar Radiation ◽  
Maximum Temperature ◽  
Daily Maximum ◽  
Box Girder ◽  
Structural Temperature ◽  
Corrugated Steel Web ◽  
Maximum Temperature Gradient ◽  
Lateral Temperature ◽  
Concrete Section

Thirty-two temperature sensors, a solar radiation sensor, wind speed, and direction sensor were installed on the bridge for the field monitoring of structural temperature, solar radiation, and wind. The frequency was set at 60 min for 211 days. Empirical equations were used to predict the maximum vertical and lateral temperature gradients, and the daily maximum and minimum mean temperatures of the corrugated steel web box girder. The results showed that the temperature gradient of the corrugated steel web box girder was closely related to the temperature gradient of air. The vertical maximum temperature gradient occurred at 4 pm. The height of the box girder had a significant effect on the accuracy of the predicted vertical maximum temperature gradient. Compared with the section without encased concrete, the maximum temperature gradient of the encased concrete section was reduced by 10.48%. Encased concrete showed minimal effect on both the vertical and lateral temperature gradient of the top plate part, however, the effect on the vertical temperature gradient of the haunch reduced by 17.19%. The maximum temperature gradient of corrugated steel with a composite encased concrete section was 4.12°C, which was less than that of the section without encased concrete at 5.06°C. The encased concrete had a significant effect on the maximum temperature gradient of corrugated steel web with a 26.99% deviation.

scholarly journals Temperature Field and Gradient Effect of a Steel-Concrete Composite Box Girder Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Haoxu Li ◽  
Zhiguo Zhang ◽  
Nianchun Deng
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Element Model ◽  
Local Temperature ◽  
Measured Temperature ◽  
Box Girder ◽  
Measuring Point ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Gradient Mode

To study the effect of the temperature field and gradient of a steel-concrete composite box girder bridge, a 5 × 35 continuous composite box girder bridge is used as the research object. The temperature measuring point is set by selecting a typical cross section, and the temperature change data are measured. The temperature field of the different positions in the composite box girder bridge is studied, the global and local temperature differences are compared, and the law of temperature distribution and the main factors affecting the temperature field are formulated. The most unfavourable expression function of the vertical temperature gradient of the section is simulated using the measured data, the existing standard temperature gradient mode is compared, the finite element model of the bridge is established, and the influence of the actual temperature gradient mode on the stress and deformation of the composite girder is further analysed. The conclusions show that the temperature differences of different azimuth sections and the local temperature differences between the steel and concrete joint parts of the steel-concrete composite box girder bridge are not significant. The temperature gradient heating and cooling model fitted by the measured temperature field can be used as a reference for the structural design of similar local bridges.

scholarly journals Temperature Gradient and Its Effect on Long-Span Prestressed Concrete Box Girder Bridge

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
B. Gu ◽  
F. Y. Zhou ◽  
W. Gao ◽  
F. Z. Xie ◽  
L. H. Lei
Keyword(s):  
Temperature Distribution ◽  
Temperature Gradient ◽  
Prestressed Concrete ◽  
Longitudinal Direction ◽  
Measured Data ◽  
Box Girder ◽  
Long Span ◽  
Concrete Box Girder ◽  
Girder Bridge ◽  
Gradient Models

Temperature variations in the girder at two cross-sections of a long-span prestressed concrete box girder bridge (PCBG) were analysed based on measured data. The results show that the temperature distribution in the concrete box girder (CBG) is strongly influenced by its size, and the temperature distribution in the girder changes along the longitudinal direction of the bridge. To clarify the temperature distribution in the long-span PCBG bridge, a two-dimensional (2D) temperature prediction model, validated by the measured data, was proposed, and the effect of the girder size on the temperature distribution of the CBG was studied using the model. Based on the results of the studies, simplified vertical and transverse temperature gradient models that could consider changes along the longitudinal direction of the bridge were proposed and validated by using the measured data and three-dimensional (3D) mechanical finite element model (FEM) of the bridge. Then, the deformations and stresses derived from the proposed temperature gradient models and the models according to different codes were studied and compared. Finally, conclusions and recommendations for future bridge design are provided.

Rehabilitation of the Boivre Viaduct - A Multispan Prestressed Box Girder Bridge

PCI Journal ◽  
1986 ◽  
Vol 31 (3) ◽  
pp. 22-47 ◽  
Author(s):  
Charles C. Zollman ◽  
Serge H. Barbaux
Keyword(s):  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge
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