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考虑冻融和紫外线双因素影响寒区混凝土坝抗震性能研究
Considering the effects of freeze-thaw and ultraviolet rays on the seismic performance of concrete dams in cold regions
投稿时间:2022-01-02  修订日期:2022-05-10
DOI:
中文关键词:  寒区  混凝土坝  紫外线  冻融循环  抗震性能
英文关键词:cold area  concrete dam  ultraviolet light  freeze-thaw cycle  seismic performance
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);东北石油大学人才引进科研启动经费资助项目(1305021827)
作者单位邮编
张宇 东北石油大学 163318
张雪 东北石油大学 
李黄河 东北石油大学 163318
宋业传 东北石油大学 163318
王铭明 昆明理工大学 
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中文摘要:
      为分析冻融循环和紫外线对寒区混凝土坝抗震性能的影响,进行了双因素下坝体材料动力性能试验研究和高坝动力特性分析。本文考虑寒区紫外线辐射量及冻融循环次数,使用紫外线老化箱和冻融循环试验机模拟实际工况,得出紫外线辐照时间及冻融循环次数与寒区混凝土材料动态性能的规律,并基于试验结果利用数值方法分析双因素对大坝动力特性影响。结果表明:与理想环境比,紫外线能加快混凝土质量下降,降低抗压强度和弹性模量;与单一冻融循环因素相比,紫外线加剧了混凝土劣化。试验结果有助于更好的研究多因素对混凝土高坝动态力学性能的影响,对寒区大坝抗震设计提供有益参考。
英文摘要:
      In order to analyze the effects of freeze-thaw cycles and ultraviolet rays on the seismic performance of concrete dams in cold regions, a dual-factor experimental study of the impact of dam materials on the dynamic performance and analysis of the dynamic characteristics of high dams were carried out. Based on the number of freeze-thaw cycles and ultraviolet radiation in cold areas, this paper uses ultraviolet aging box and freeze-thaw cycle testing machine to simulate actual working conditions, and obtains the law of ultraviolet radiation time and freeze-thaw cycle times and the dynamic performance of concrete materials in cold areas. Based on the test results, numerical simulation methods are used to analyze the influence of dual factors on the dynamic characteristics of the dam. The results show that: compared with the ideal environment, ultraviolet rays can accelerate the deterioration of concrete quality and reduce the compressive strength and elastic modulus; compared with a single freeze-thaw cycle factor, ultraviolet rays aggravate the deterioration of concrete. The test results help to study the influence of multiple factors on the dynamic mechanical properties of high concrete dams, and provide a useful reference for the seismic design of dams in cold areas.
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