中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

重庆交通大学学报(自然科学版) ›› 2010, Vol. 29 ›› Issue (2): 190-193.

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混凝土在持续荷载下的强度

郑丹1,2,李鑫鑫1   

  1. 1.重庆交通大学河海学院,重庆 400074;2.中国长江三峡工程总公司,湖北 宜昌 443002
  • 收稿日期:2009-09-05 修回日期:2009-12-01 出版日期:2010-04-15 发布日期:2015-01-22
  • 作者简介:郑丹(1979—),男,重庆市人,副教授,主要从事混凝土性能方面的工作。E-mail:zhengdan@cquc.edu.cn。
  • 基金资助:
    中国博士后科学基金项目(20080440979);国家自然科学基金项目(50809079)

Concrete Strength under Sustained Loading

ZHENG Dan1,2,LI Xin-xin1   

  1. 1.School of River & Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China; 2.China Three Georges Project Corporation,Yichang 443002,Hubei,China
  • Received:2009-09-05 Revised:2009-12-01 Online:2010-04-15 Published:2015-01-22

摘要: 通过比较混凝土在持续荷载的损伤与疲劳损伤的联系,假定在持续荷载下混凝土的损伤速率和应变增长速 率成正比;分析了混凝土在持续荷载下的变形行为和损伤机理,及混凝土在不同荷载历史情况下的破坏边界面;建 立了荷载水平和临界损伤应变之间的关系;研究了不同荷载水平下混凝土的真实强度以及不同强度混凝土在持续 荷载下的性能。与试验结果对比,建立的模型可以较好地反映混凝土在持续荷载下的性能。

关键词: 混凝土, 强度, 损伤, 持续荷载, 徐变

Abstract: Concrete strength under long-term sustained loading was investigated in this paper. By analyzing deformation behavior and damage evolution mechanism of concrete under sustained loading,and by comparing concrete creep and fatigue behavior similarity,the damage evolution ratio was assumed in proportion to strain increasing ratio. The envelope of concrete stress-strain relationship was analyzed with consideration of microcracks evolution in concrete material. The relationship between stress level and critical damage strain was then established. Concrete real strength under sustained loading was achieved. Comparing with existed experiments shows a good correlation.

Key words: concrete, strength, damage, sustained loading, creep

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