| 吴智敏,徐世烺,王金来.基于虚拟裂缝模型的混凝土双K断裂参数[J].水利学报,1999,30(7):0012-0017 |
| 基于虚拟裂缝模型的混凝土双K断裂参数 |
| Fracture Parameters of Concrete Basedon the Ficititious Crack Model |
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| DOI： |
| 中文关键词: 混凝土 断裂参数 临界裂缝 虚拟裂缝模型 |
| 英文关键词: concrete fracture parameters crtical crack tip opening displacement fictitious crack model |
| 基金项目: |
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| 摘要点击次数: 1991 |
| 全文下载次数: 120 |
| 中文摘要: |
| 本文将虚拟裂缝模型与线弹性断裂力学相结合，利用楔入劈拉试件在实验中测得的最大荷载Pmax及对应的裂缝口张开位移CMODc，求得了混凝土裂缝亚临界扩展量Δac的解析解，据此计算了最大尺寸为700×700×200mm的楔入劈拉混凝土试件的起裂断裂韧度,失稳断裂韧度及临界裂缝尖端张开位移CTODc，并与试验结果进行了比较。研究结果表明，当试件高度h＞400mm时，、，CTODc是一个与试件高度无关的断裂参数 |
| 英文摘要: |
| The pre-critical crack propagation length Δac of concrete is analytically evaluated by using the maximum load and critical crack mouth opening displacement measured in experiments by means of wedge splitting specimens.According to the analytical solution of Δac,the initiation fracture toughness KiniIc,unstable fracture toughness KunIc and the critical crack tip opening displacement CTODc of the wedge splitting concrete specimens are analytically determined and compared with the test data.The results show that the KiniIc,KunIc and CTODc are size-independent when the specimen height is larger than 400mm,and the double-K fracture criterion can well describe the cracking initiation and unstable fracture of cncrete structure. |
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