| 张宇*,张雪,李黄河,宋业传,王铭明*.考虑冻融和紫外线双因素影响的寒区混凝土坝抗震性能研究[J].实验力学,2023,38(1):101~108 |
| 考虑冻融和紫外线双因素影响的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：10.7520/1001-4888-22-001 |
| 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(51969010)；东北石油大学人才引进科研启动经费资助项目(1305021827) |
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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。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影响规律；基于试验结果，利用数值方法分析了双因素对大坝动力损伤的影响。结果表明：与理想环境相比，紫外线辐射会降低混凝土的抗压强度和弹性模量；与单一冻融循环因素相比，紫外线与冻融循环双因素加剧了混凝土劣化；强震时，冻融和紫外线对混凝土的劣化影响，增加了大坝的损伤破坏程度。上述试验结果有助于更好地研究多因素对混凝土高坝动态力学性能的影响，可为寒区大坝抗震设计提供参考。 |
| 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 used an ultraviolet aging box and freeze-thaw cycle testing machine to simulate actual working conditions, and obtained 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, the numerical method was used to analyze the influence of dual factors on the dynamic damage of the dam. The results show that: compared with the ideal environment, ultraviolet rays can reduce the compressive strength and elastic modulus of concrete; compared with a single freeze-thaw cycle factor, the dual factor of ultraviolet light and freeze-thaw cycle aggravates the deterioration of concrete; during strong earthquakes, the effects of ultraviolet rays and freeze-thaw degradation increase the degree of damage to the dam. The test results provide the reference for studying the influence of multiple factors on the dynamic mechanical properties of high concrete dams, and the seismic design of dams in cold areas. |
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