| 钢筋混凝土界面疲劳裂纹扩展模拟研究 |
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| 引用本文： | 陈艳华,朱庆杰,石志飞. 钢筋混凝土界面疲劳裂纹扩展模拟研究[J]. 北京交通大学学报(自然科学版), 2003, 27(4): 36-40 |
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| 作者姓名： | 陈艳华 朱庆杰 石志飞 |
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| 作者单位： | 北方交通大学土木建筑工程学院，河北理工学院土建系，北方交通大学土木建筑工程学院 北京100044，河北唐山063009，北京100044 |
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| 基金项目： | 国家自然科学基金资助项目(59778034) |
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| 摘 要： | 界面脱粘是钢筋混凝土材料与结构的主要失效形式之一.基于剪切筒模型和常用疲劳加载方式,首先建立了循环荷载作用下钢筋与混凝土界面脱粘应力的计算模型;然后根据断裂脱粘准则,借助描述疲劳裂纹扩展的Paris公式,得到了脱粘界面疲劳裂纹扩展速率、扩展长度以及脱粘界面上摩擦系数与循环加载次数的关系;最后对处于循环荷载作用下的钢筋与混凝土界面进行裂纹扩展的模拟计算与分析.结果表明,摩擦系数的衰减程度是影响界面脱粘应力大小及裂纹扩展快慢的主要因素,而且材料的尺寸效应对界面疲劳特性的影响也不容忽视.
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| 关 键 词： | 建筑材料 钢筋混凝土 界面疲劳 脱粘 裂纹扩展 |
| 文章编号： | 1000-1506(2003)04-0036-05 |
| 修稿时间： | 2002-03-27 |
Simulative Investigation of Fatigue Crack Growth at Steel-Concrete Interface |
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| Abstract: | Interfacial debonding is one of the main damage form for steel-concrete and its structure. Based on the shear-lag model and the usual loading way, the computation model of interfacial debonding stress under tension-tension cyclic loading is established first. Then, according to the debonding criterion and the Paris formula, the relationship among the interfacial debonding rate, debonding length, coefficient of friction and the number of cyclic loading is obtained. At last, the interfacial fatigue crack growth is simulated and analyzed by an example. Results indicate that degradation of frictional coefficient is the main factor to influence the debond stress and crack growth during the fatigue loading. Also the effect of the geometric size should be considered to interfacial fatigue crack growth. |
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| Keywords: | building material steel-concrete interfacial fatigue debonding crack growth |
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