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  • Important Date
  • August 8, 2025

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  • August 12, 2025

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  • August 15, 2025

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  • August 16, 2025, morning

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  • August 16, 2025, afternoon

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[Oral Presentation]寒区圆钢管微膨胀混凝土加固钢管约束混凝土柱拟静力试验研究

寒区圆钢管微膨胀混凝土加固钢管约束混凝土柱拟静力试验研究
ID:62 View Protection:ATTENDEE Updated Time:2025-08-02 20:51:30 Hits:184 Oral Presentation

Start Time:2025-08-15 20:50 (Asia/Shanghai)

Duration:10min

Session:[S1] 8月15日晚上 研究生分会 » [S1-2] 研究生分会场二

Presentation File

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Abstract
为研究高寒地区震损钢管约束混凝土柱加固后的抗震性能,设计6根圆钢管约束混凝土柱试件,通过低周往复加载至破坏后,采用不同壁厚(2 mm、3 mm)的外包圆钢管夹层灌注高强微膨胀混凝土对试件进行加固,并开展不同环境温度下的加固后试件拟静力试验,探究寒区采用外包圆钢管夹层灌注高强微膨胀混凝土加固钢管约束混凝土柱的抗震性能,揭示外包钢加固震损钢管约束混凝土柱在不同环境温度下的震损机理。结果表明:常温工况下,采用圆钢管夹层灌注高强微膨胀混凝土加固后,钢管约束混凝土柱受损截面处加固效果显著,塑性铰区域由柱脚部位移至外包钢顶部,加固柱较原柱水平承载力提高19.8%,延性提高8%,验证了该加固方法的可靠性;加固后试件在不同环境温度下的破坏形态均为压弯塑性铰破坏,在距离外包钢上部约3 cm位置发生鼓曲破坏;环境温度越低,加固柱越易发生破坏,且破坏程度较常温试件更严重;低温工况下,加固柱较常温柱水平承载力最大提升22.7%,而位移延性系数显著降低,最大降低达38.3%。
 
Keywords
钢管约束混凝土柱;抗震性能;加固;拟静力试验;环境温度
Speaker
张杰
学生 兰州交通大学

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