Research of Thermal Effect of Cable‐Stayed Bridge with a Separated Side‐Box Steel‐Concrete Composite Girder under Solar Radiation

Zhang, Hanhao; Wang, Pei-zhi; He, Shuanhai; Li, Yuan; Chen, Kefan; Sun, Nannan

doi:10.1155/2021/8812687

Cited by 4 publications

(4 citation statements)

References 12 publications

(24 reference statements)

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“…Figure 6 shows the temperature-time curves of the two representative points, from which we could know the following: (1) e temperature on the downstream surface was significantly influenced by the air temperature variation, and its variation law was consistent with that of air temperature, presented as a cosine curve, but the peak time of the dam surface temperature had an obvious hysteresis effect compared with that of the air temperature, about 2 hours lagging behind. is is consistent with the research rule in reference [1,23]. (2) Under the same action of air temperature variation law, values of temperature variation at P1 and P2 were basically consistent with the variation law.…”

Section: Results Analysis Of Ermal Fieldsupporting

confidence: 90%

“…From Figure 10, it could be known that the change law of Z-direction stress-time curves of the arch dam at P1 and P2 was consistent with that of temperature-time curves, both of which varied as cosine curve, which indicated that the stress state of concrete was greatly affected by the air temperature. e same rule was found in reference [23]. e Z-direction stress calculation results of both points at special moments are shown in Table 4.…”

Section: Results Analysis Of Ermal Stresssupporting

confidence: 65%

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FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

et al. 2021

Advances in Civil Engineering

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In order to make clear the cracking reasons in arch dam of Xiaowan Hydropower Station during operation period, the approach to combine ANSYS with finite element program COCE-3D is adopted. Firstly, the influence by element type and mesh size for the temperature field simulation result is analyzed. Subsequently, the three typical dam segments cut from Xiaowan arch dam are selected and the relevant finite element model is established; the effect of the measured diurnal air temperature on temperature field and temperature stress of arch dam is analyzed thoroughly. The results indicate that the temperature gradient in mass concrete becomes lower, whereas the affecting depth becomes deeper when the mesh size is too large. Therefore, it is advisable to use smaller size mesh to study the influence of the measured diurnal air temperature on the surface temperature distribution in mass concrete. The temperature of downstream zone in arch dam is significantly affected by air temperature; the changing laws of temperature field and temperature stress with the air temperature are basically consistent, which is sensitive to lower temperature. When the temperature sharply decreased, the temperature stress in the downstream zone is mainly in tensile stress state. The calculated results are basically consistent with the measured results, and the temperature stress induced by the day-night temperature difference is the important reason for the horizontal cracks on the downstream surface. The submodel analysis method is an important alternative approach to study the changing laws of temperature field of arch dam. The research results not only provide an evidence for temperature control and crack prevention of Xiaowan arch dam but also provide a reference for temperature field simulation of similar projects.

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Section: Results Analysis Of Ermal Fieldsupporting

confidence: 90%

Section: Results Analysis Of Ermal Stresssupporting

confidence: 65%

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

et al. 2021

Advances in Civil Engineering

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“…The optimal deployment of thermometers was discussed to more accurately estimate the bridge responses. Zhang et al (2021b) numerically studied the temperature effects on a cable-stayed bridge with a separated sidebox steel-concrete composite girder. The bridge was separately simulated by two models with different element compositions.…”

Section: Cable-stayed Bridgementioning

confidence: 99%

Thermal behaviors of bridges — A literature review

Chen

Zhou

et al. 2023

Advances in Structural Engineering

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This work provides a comprehensive review of previous studies concerning the static thermal behaviors of various types of bridges, including beam bridges, arch bridges, cable-stayed, and suspension bridges. Given that thermal behaviors are closely associated with the temperature distribution of bridges, the basis of the heat transfer analysis is briefly introduced first. The studies of the temperature distribution and the temperature actions of each type of bridge are then reviewed from the perspective of theoretical analysis, numerical simulation, experimental tests, and field monitoring. Finally, some existing problems are discussed, and future research topics are recommended.

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“…The temperature distribution of concrete box girders and its influencing factors under cold wave conditions have been a prominent research focus in the field of engineering. Previous studies have examined the impact of key factors, such as solar radiation and air temperature changes, on the structural behavior of concrete box girders [10][11][12]. They have also proposed models to predict temperature gradients under ambient thermal loads.…”

Section: Introductionmentioning

confidence: 99%

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

Li,

Ba,

Zhang

et al. 2024

Applied Sciences

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In regions with severe cold and high latitudes, concrete structures are susceptible to cracking and displacement due to uneven temperature stress, which directly impacts their normal utilization. Therefore, to investigate the temperature distribution characteristics of concrete box girders under the combined influence of low temperatures and cold waves, a temperature test was conducted on a model of concrete box girders in Xinjiang Province, China. Based on the measured data, the distribution pattern of the most unfavorable negative temperature differential observed in high-latitude regions was determined. Long-term numerical simulation and extreme value analysis were performed using historical meteorological data, revealing that the vertical negative temperature gradient in the concrete box girder structures follows a composite exponential distribution. The temperature differential at the top complies with Chinese code requirements, while at the bottom, it aligns more closely with British standard BS5400. Statistical analysis of historical meteorological data predicts that the 50-year temperature differential will result in a drop amplitude of 26.42 °C, which is 1.44 times higher than measured values obtained from experiments. The proposed negative temperature gradient pattern for concrete box girders presented in this study can encompass general design codes and provide guidance for designing concrete bridges in severe cold areas.

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Research of Thermal Effect of Cable‐Stayed Bridge with a Separated Side‐Box Steel‐Concrete Composite Girder under Solar Radiation

Cited by 4 publications

References 12 publications

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

FEA of Effects Induced by Diurnal Temperature Variation on Downstream Surface of Xiaowan Arch Dam

Thermal behaviors of bridges — A literature review

Temperature Distribution Characteristics and Action Pattern of Concrete Box Girder under Low-Temperature and Cold Wave Conditions

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