Temperature Gradients in Bridge Concrete I-Girders under Heat Wave

Hagedorn, Ryan; Martí‐Vargas, José R.; Dang, Canh N.; Hale, William; Floyd, Royce W.

doi:10.1061/(asce)be.1943-5592.0001454

Cited by 47 publications

(18 citation statements)

References 11 publications

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“…13 The temperature gradients of concrete bridge girders under natural environmental conditions have been obtained based on temperature experiments. 14 The temperature gradients of concrete box girders have been studied based on long-term temperature experiments and high moment theory. 15 Moreover, the temperature distributions of concrete box girder bridges induced by cold wave processes differ from those induced by solar radiation or nighttime radiation cooling, proving environmental factors influence the temperature fields of box girder bridges.…”

Section: Introductionmentioning

confidence: 99%

Time-varying non-uniform temperature distributions in concrete box girders caused by solar radiation in various regions in China

Sheng

Shi

Zheng

et al. 2022

Advances in Mechanical Engineering

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Non-uniform temperature distributions of concrete box girders are induced by solar radiation depending on the structural shapes and shadows cast on them. Using a real-time shadow-selection algorithm and finite element method, the thermodynamic analysis of concrete box girders is carried out to simulate their time-varying temperature distributions. The theoretical results of the finite element model (FEM) are verified by measured data. Based on this, a series of FEMs of concrete box girders are established considering regional influences, and the temperature gradients of concrete box girders in different climatic zones in China are studied. The most unfavorable temperature gradient of concrete box girders in China is obtained, and it is important for design and not only for health monitoring. Moreover, comparing the temperature gradient modes in the specifications of various countries, the temperature gradient of concrete box girders in the China Highway Bridges Design Code is conservative for structural design. Furthermore, the influences on structural temperature distributions of varying environmental factors induced by regional influences are explored, including atmospheric transparency coefficient (ATC) and solar radiation absorptivity (SRA).

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Section: Introductionmentioning

confidence: 99%

Time-varying non-uniform temperature distributions in concrete box girders caused by solar radiation in various regions in China

Sheng

Shi

Zheng

et al. 2022

Advances in Mechanical Engineering

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“…17,18 Peiretti et al 19 conducted temperature measurements on the solid prestressed concrete bridge deck for 4 years and found that the maximum daily temperature change value of the bridge was 18°C, which proved that the 10°C specified in Eurocode 1 still needs a further supplement. Hagedorn et al 20 performed experimental investigations on I-shaped concrete girders under solar radiation and addressed that the current design specifications do not accurately estimate the temperature gradient of the wide bottom flange girders. The above research mainly investigated the temperature distribution law or simulation method under solar radiation, but the actual environment is complicated and uncertain.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and numerical simulation of temperature gradient effect for steel-concrete composite bridge deck

Wang

Tan

Wang

et al. 2021

Measurement and Control

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The temperature distribution of the bridge and its thermal effect has always been an important issue for researchers. To investigate the temperature distribution and thermal stress in the steel-concrete composite bridge deck, a 1:4 ratio temperature gradient effect experimental study was carried out in this paper. First, a set of experimental equipment for laboratory temperature gradient loading was designed based on the principle of temperature gradient caused by solar radiation, the temperature gradient obtained from the measurements were compared with the specifications and verified by the FE method. Next, the loading of the steel-concrete composite deck at different temperatures was performed. The thermal stress response and change trend of the simply supported and continuously constrained boundary conditions under different temperature loads were analyzed. The experimental results show that the vertical temperature of steel-concrete composite bridge deck is nonlinear, which is consistent with the temperature gradient trend of specifications. The vertical temperature gradient has a great influence on the steel-concrete composite bridge deck under different constraints, and the extreme stress of concrete slab and steel beam is almost linear with the temperature gradient. Finally, some suggestions for steel-concrete composite deck design were provided based on the research results.

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“…However, only a few focused on the influence of geometrical aspects and girder superstructure configuration. Hagedorn et al [30] constructed three experimental concrete I-girders. The three girders were AASHTO Type-I girders, but with different top flange configurations.…”

Section: Introductionmentioning

confidence: 99%

Geometrical Parametric Study on Steel Beams Exposed to Solar Radiation

et al. 2021

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A finite element thermal analysis was conducted in this study with the aim of evaluating the influence of the geometrical parameters of steel sections on their thermal response under solar radiation. Four W12 and W24 standard steel beams were investigated under the solar irradiation conditions of a sunny summer day. The finite element analysis was carried out using COMSOL Multiphysics considering the Sun’s movement from sunrise to sunset, reflected radiation from the ground, surface convection of air and long wave radiation as the main boundary thermal loads. The temperature-time variation at different locations in the sections, vertical temperature distributions, temperature gradient distributions and thermal stress distributions were investigated. The results showed that the daily maximum temperatures, temperature variation, temperature and temperature gradient distributions and thermal stresses are influenced by the geometry of the steel section. The flange width and flange thickness were found to be the controlling parameters during the noon hours, while these parameters in addition to web depth control the shading effect during the afternoon. On the other hand, web thickness affects the temperature of webs at sunrise and sunset times. Geometrical ratios like Wf/H, Wf/tf2 and 2Wf/Htf were the most influential parameters on temperatures, temperature gradients and thermal stresses of steel beams subjected to solar radiation. The investigated section with the maximum Wf/tf2 value of 0.96 (W12 × 58) recorded the highest top-surface noon temperature, while section W24 × 84 with the lowest Wf/tf2 value of 0.60 exhibited the lowest temperature.

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Temperature Gradients in Bridge Concrete I-Girders under Heat Wave

Cited by 47 publications

References 11 publications

Time-varying non-uniform temperature distributions in concrete box girders caused by solar radiation in various regions in China

Time-varying non-uniform temperature distributions in concrete box girders caused by solar radiation in various regions in China

Experimental study and numerical simulation of temperature gradient effect for steel-concrete composite bridge deck

Geometrical Parametric Study on Steel Beams Exposed to Solar Radiation

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