| 吴智敏,徐世烺,刘佳毅.光弹贴片法研究混凝土裂缝扩展过程及双K断裂参数的尺寸效应[J].水利学报,2001,32(4):0034-0040 |
| 光弹贴片法研究混凝土裂缝扩展过程及双K断裂参数的尺寸效应 |
| Study on crack propagation process of concrete and size effect of double-K fracture parameter by means of photoelastic coatings |
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| DOI： |
| 中文关键词: 混凝土 裂缝 断裂参数 光弹贴片 |
| 英文关键词: concrete crack fracture parameter photoelastic coating |
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| 中文摘要: |
| 本文采用最大尺寸为1200mm×1200mm×200mm的楔入劈拉试件，利用光弹贴片法对混凝土预制缝的起裂、稳定扩展直至失稳破坏全过程进行了系统的研究。采用照相机及数码摄像机拍摄了光弹贴片所显示的裂缝扩展全过程，获得了各级荷载下各试件裂缝的亚临界扩展量。在此基础上，根据试验测得的起裂荷载Pini及最大荷载Pmax计算了混凝土起裂断裂韧度KICini及失稳断裂韧度KICun。结果表明，混凝土KICini与试件高度无关，而当试件高度大于600mm时，所测得的KICun也与试件高度无关，这说明混凝土双K断裂参数(KICini及KICun)可以作为混凝土的材料参数。 |
| 英文摘要: |
| The wedge splitting specimens with maximum size 1200mm×1200×200mm are utilized to systematically investigate the crack initiation,stable propagation and unstable failure of concrete by means of photoelastic coatings.Using camera and digital video camera,the complete crack propagation process of concrete that appeared as interference fringes on the photoelastic coatings was recorded.On this basis,the propagation lengths under various loads are obtained.The crack initiation fracture toughness KICini and the unstable fracture toughness KICun are determined according to the crack initiating load and the maximum load measured in the experiment.The result shows that the ＫICini is independent of the specimen height and so the ＫICun when the specimen height reaches 600mm.Therefore,the double-K fracture parameter can be utilized as concrete material constant to describe the crack initiation,stable propagation and unstable failure of concrete structure. |
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