自密实混凝土高温强度智能预测与机理解释模型研究
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1.河南科技大学;2.四川省建筑设计研究院有限公司;3.广州大学风工程与工程振动研究中心;4.河南科技大学土木建筑学院

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TU528

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国家重点研发计划


Intelligent Prediction and Mechanism Explanation Model for High Temperature Strength of Self-Compacting Concrete
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1.School of Civil Engineering and Architecture,Henan University of Science and Technology;2.Sichuan Provincial Architectural Design and Research Institute Co,Ltd;3.Research Center for Wind Engineering and Engineering Vibration,Guangzhou University

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    摘要:

    为明晰自密实混凝土高温抗压强度劣化规律,本研究采用集成机器学习模型构建可解释预测框架,实现自密实混凝土高温后残余抗压强度预测,并揭示其强度损失机理。结果表明:麻雀搜索优化的XGBoost模型对自密实混凝土高温后抗压强度具备优异预测能力,精度可达98.0%。整体特征重要性分析结果显示,受火温度是影响高温残余抗压强度的主控因素,其次为细骨料掺量和水胶比。通过特征交互网络分析表明,受火温度与水胶比、细骨料掺量呈负向交互作用,而与补充胶凝材料掺量呈正向交互作用,掺入补充胶凝材料可有效改善其高温抗压性能。此外,本研究开发了在线智能预测工具,不仅可实现高温抗压强度快速精准预测,还能从整体和个体尺度可视化表征高温强度损失的关键驱动因素及其贡献程度。研究成果可为自密实混凝土构件火灾后性能评估与精准修复提供理论支撑和智能决策支持。

    Abstract:

    In order to clarify the deterioration law of high-temperature compressive strength of self-compacting concrete, an integrated machine learning model was employed in this study to construct an interpretable prediction framework for forecasting the residual compressive strength of self-compacting concrete after high-temperature exposure, whereby the intrinsic mechanism of strength loss was revealed. The results show that the XGBoost model optimized by the sparrow search algorithm exhibits outstanding predictive performance for the residual compressive strength of self-compacting concrete following high-temperature treatment, with a prediction accuracy of 98.0%. The overall feature importance analysis demonstrates that fire exposure temperature serves as the dominant factor affecting the high-temperature residual compressive strength, followed by fine aggregate dosage and water-binder ratio. The feature interaction network analysis indicates that fire exposure temperature presents negative interactive effects with both water-binder ratio and fine aggregate dosage, while a positive interactive correlation is found between fire exposure temperature and supplementary cementitious material dosage. The addition of supplementary cementitious materials can effectively improve the high-temperature compressive performance of self-compacting concrete. Furthermore, an online intelligent prediction tool was developed in this study. This tool enables the rapid and accurate prediction of high-temperature compressive strength and the visual characterization of core driving factors for high-temperature strength loss as well as their corresponding contribution degrees at both global and individual scales. The research outcomes can provide solid theoretical support and intelligent decision-making guidance for the post-fire performance evaluation and precise remediation of self-compacting concrete components.

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权超超,罗麒锐,黄 鹏,等. 自密实混凝土高温强度智能预测与机理解释模型研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2026-04-11
  • 最后修改日期:2026-06-09
  • 录用日期:2026-07-31
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