Research on temperature action and cracking risk of steel–concrete composite girder during the hydration process

Liu, Jiang; Liu, Yongjian; Zhang, Ning; Ma, Zhiyuan; Bai, Yongxin

doi:10.1007/s43452-020-00050-0

Cited by 17 publications

(9 citation statements)

References 23 publications

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“…Another temperature study on steel-concrete compositing beams is cracking risk of steel-concrete composite girder during the hydration process. Liu et al (2020) reported a simplified method for the thermal stress calculation of composite girders. The measurements showed that temperature differences in the concrete deck varied and were below 5°C, and was less than that in the entire composite section.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Shen

Liu

2021

Advances in Structural Engineering

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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.

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Section: Introductionmentioning

confidence: 99%

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

Zhang

Shen

Liu

2021

Advances in Structural Engineering

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“…The strain distribution along the longitudinal axis of the raft, as depicted in Figure 8, was predominantly instigated by temperature fluctuations during the thermal accumulation phase (Liu et al, 2020). As discernible from Section 3.1, the temperature in the central region was typically superior to the surface and bottom, inducing a more pronounced expansion of its concrete volume.…”

Section: Principle Of Strain Distributionmentioning

confidence: 89%

Investigation into the seamless construction for hundred-meter scale super-length raft structure based on magnesia expansive agent concrete

Han,

Wang,

Liao

et al. 2024

Front. Mater.

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This research introduces an innovative construction method based on magnesia expansive agent concrete for the seamless construction of hundred-meter scale super-length raft structures, corroborated by the on-site test. The basic principle of this construction method is to use the pre compression stress generated by magnesia expansive agent to offset temperature and shrinkage stress. A temperature-strain monitoring system was employed to gather data, affirming the technique’s applicability and safety. Through the examination of temperature and strain dispersion trends in super-length raft structure, recommendations for the configuration of temperature-strain sensors have been put forth. Through the scrutiny of the temporal evolution pattern of temperature, the specific temporal and spatial coordinates that warrant particular vigilance during the surveillance of the raft’s inner-surface temperature difference were identified. Upon evaluating the correlation between strain dispersion and strain-temperature differential in the raft’s thickness dimension, a novel temperature control index (the bottom-surface temperature difference) was introduced. The threshold for this metric was established at 30°C, derived from empirical test outcomes conducted on-site. Furthermore, the critical regions for monitoring the bottom-surface temperature difference were specified.

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“…Chen et al (2000) studied the temperature field of CFST columns and pointed out the size of the tube would affect the temperature evolutions. Liu et al (2020) analyzed the temperature field of two CFST columns subject to solar radiation. It was found that the temperature field of the concrete was unsymmetrical, and the temperature at the centroid was apparently higher than the mean temperature of the whole cross-section.…”

Section: Introductionmentioning

confidence: 99%

In-situ measurements of temperature and strain fields of large-diameter concrete-filled steel tube columns and the refined finite element modeling

Liu,

Wang,

Bai

et al. 2024

Advances in Structural Engineering

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Concrete-filled steel tube (CFST) columns are prevalent in transmission towers and arch bridges due to their cost-effectiveness and superior mechanical performance. The growing megastructures lead to large-diameter CFST components, which are exposed to the risk of early-age thermal concrete cracking. In this study, temperature and strain fields of two 2.1 m-dia. CFST columns were monitored in-situ. Within 30 h, the peak temperature and tensile strain at the centroid reached 97.0°C and 400 με, respectively. Meanwhile, temperature fields of eight scaled CFST columns were also monitored and compared. In addition, ultrasonic pulse velocity test was performed to detect the early-age thermal cracking. To predict the temperature and strain evolutions accurately, a refined numerical model is proposed, considering coupled mechanical, hydration and thermal processes. It is revealed that the model could accurately predict the temperature and strain evolutions of CFST columns. Furthermore, experiments and numerical simulations illustrate that thermal cracking would likely be triggered in CFST components with diameter greater than 1.2 m.

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Research on temperature action and cracking risk of steel–concrete composite girder during the hydration process

Cited by 17 publications

References 23 publications

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

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

Investigation into the seamless construction for hundred-meter scale super-length raft structure based on magnesia expansive agent concrete

In-situ measurements of temperature and strain fields of large-diameter concrete-filled steel tube columns and the refined finite element modeling

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