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	不同加载速率下饱和混凝土的劈拉试验研究及强度变化机理
	王海龙 ; 李庆斌 ; WANG Hai-long ; LI Qing-bin
	2010-06-10 ; 2010-06-10
关键词	饱和混凝土 劈拉强度 自由水 裂纹 机理 saturated concrete tensile strength free water cracking mechanism TU528
其他题名	EXPERIMENTS ON SATURATED CONCRETE UNDER DIFFERENT SPLITTING TENSILE RATE AND MECHANISM ON STRENGTH CHANGE
中文摘要	利用大型液压伺服试验机研究了不同加载速率下饱和混凝土与干燥混凝土的劈拉强度变化情况,试验研究表明:在准静态加载时,与干燥的混凝土相比饱和混凝土的劈拉强度有所降低,随着加载速率的升高,饱和混凝土的的动态劈拉强度有较大的提高。通过对干、湿混凝土强度变化的比较表明:孔隙及裂缝中的自由水对混凝土强度有所影响。根据细观层次上、不同加载速率下裂纹中孔隙水压力的作用形式(即低加载率时孔隙水的“楔入”作用和高加载率时的“Stefan效应”),利用断裂力学来探讨不同加载速率下饱和混凝土劈拉强度的变化机理。结果表明:提出的机理可以较好地解释饱和混凝土强度的变化情况。; The tensile strengths of saturated and dry concrete under different loading rates were studied by splitting tensile tests. The experimental results show that the tensile strength of saturated concrete was lower than that of the dry concrete under low loading rate but was larger under high loading rate. The comparison between dry and saturated concretes indicates that the free water in the pores and cracks affects the mechanical properties of concrete. The mechanisms of these changes are analyzed in terms of the acting modes of pore water on the saturated concrete under different loading rates. The free water in the cracks acts as a wedge, which decreases the strength of saturated concrete under quasi-static loading, but it acts as opposite force, which increases the strength of saturated concrete under high loading rate according to the Stefan effect in physics. The fracture mechanics based on these mechanisms are used to discuss these changes and the results show that these mechanisms can explain the mechanical properties of saturated concrete well.; 国家自然科学基金项目(50225927;90210010); 国家973项目(2002CB412709); 教育部科技创新工程重大项目(704003)
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/59776]
专题	清华大学
推荐引用方式 GB/T 7714	王海龙,李庆斌,WANG Hai-long,等. 不同加载速率下饱和混凝土的劈拉试验研究及强度变化机理[J],2010, 2010.
APA	王海龙,李庆斌,WANG Hai-long,&LI Qing-bin.(2010).不同加载速率下饱和混凝土的劈拉试验研究及强度变化机理..
MLA	王海龙,et al."不同加载速率下饱和混凝土的劈拉试验研究及强度变化机理".(2010).

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