| 冻融后预应力混凝土构件疲劳损伤模型 |
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| 引用本文： | 刘荣桂,张益多,陈妤,刘涛.冻融后预应力混凝土构件疲劳损伤模型[J].江苏大学学报(自然科学版),2012,33(1):115-119. |
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| 作者姓名： | 刘荣桂 张益多 陈妤 刘涛 |
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| 作者单位： | 1. 江苏大学 理学院,江苏镇江,212013
2. 江苏大学 理学院,江苏镇江212013;江苏科技大学 土木建筑学院,江苏镇江212003 |
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| 基金项目： | 国家自然科学基金，江苏省博士创新工程基金 |
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| 摘 要： | 通过7根预应力混凝土梁进行不同冻融循环次数后的疲劳试验,研究冻融环境下构件由于疲劳累积损伤而造成的刚度衰减规律,试验结果表明冻融作用对构件在疲劳荷载下挠度的发展起加剧作用,且随着冻融次数增多作用愈明显.在冻融循环和疲劳荷载的共同作用下,试验梁的剩余刚度在弯曲疲劳过程中呈现三阶段衰减规律,并且在第2阶段近似呈线性衰减,构件发生疲劳破坏时,其剩余刚度衰减至初始刚度的66%左右.根据损伤理论得到试验梁基于刚度衰减的累积损伤值D与循环寿命比n/Nf之间的关系模型,该模型考虑了冻融效应对疲劳累积损伤的影响,可为寒区预应力混凝土梁疲劳寿命预测提供有价值的参考.
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| 关 键 词： | 预应力混凝土 刚度 冻融 疲劳 累积损伤 |
Fatigue damage model of prestressed concrete beams suffered freeze-thawing |
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| Liu Ronggui
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Zhang Yiduo
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Chen Yu
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Liu Tao.Fatigue damage model of prestressed concrete beams suffered freeze-thawing[J].Journal of Jiangsu University:Natural Science Edition,2012,33(1):115-119. |
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| Authors: | Liu Ronggui Zhang Yiduo Chen Yu Liu Tao |
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| Institution: | 1(1.Facuty of Science,Jiangsu University,Zhenjiang,Jiangsu 212013,China;2.School of Civil Engineering and Architectural,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu 212003,China) |
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| Abstract: | In order to inverstigate the rigidity deterioration regulation of the accumulative fatigue damage under freeze-thaw enviorment,a fatigue experiment of seven prestressed concrete beams was conducted for different freeze-thawing times.The experiment results indicate that freeze-thawing effect can aggravate the deflection development of test beams in fatigue experiment.The remaining rigidity of test beams shows a course of a three-stage deterioration characteristic,and displays a linear deterioration during the second stage with 66% initial rigidity at fracture.A model was proposed to describe the relation between accumulative damage of D and cycling life ratio of n/Nf.The freeze-thawing effect on accumulative damage was considered to provide valuable reference in fatigue life prediction of prestressed concrete beams in cold region. |
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| Keywords: | prestressed concrete rigidity freeze-thaw fatigue accumulative damage |
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