| 采用峰值荷载法确定全级配水工混凝土断裂参数 |
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| 引用本文： | 管俊峰,李庆斌,吴智敏.采用峰值荷载法确定全级配水工混凝土断裂参数[J].工程力学,2014,31(8):8-13. |
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| 作者姓名： | 管俊峰 李庆斌 吴智敏 |
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| 作者单位： | 1.华北水利水电大学土木与交通学院,河南,郑州 450011; |
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| 基金项目： | 国家自然科学基金青年基金项目(51209094,51009020);国家重点基础研究发展计划(973)项目(2013CB035902);海岸和近海工程国家重点实验室基金项目(LP1211);华北水利水电学院高层次人才科研启动项目(201064) |
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| 摘 要： | 该文采用峰值荷载法研究了全级配水工混凝土试件的断裂参数。通过有限元方法,得到了适用于全级配水工混凝土的非标准楔入劈拉试件的应力强度因子K、裂缝嘴张开口位移CMOD计算公式以及裂缝张开位移COD与CMOD比值COD/CMOD的相关曲线。基于相关断裂试验,通过该文所提公式得到了全级配水工混凝土的等效断裂韧度与临界裂缝尖端张开口位移CTODc等断裂参数。研究结果表明:峰值荷载法可应用于截面尺寸不同而缝高比相同的全级配水工混凝土试件,峰值荷载法只需实测各试件的峰值荷载,就可方便确定全级配水工混凝土的断裂参数。
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| 关 键 词： | 水工结构 断裂性能 峰值荷载法 全级配水工混凝土 楔入劈裂试件 等效断裂韧度 |
| 收稿时间： | 2013-03-14 |
DETERMINATION OF FULLY-GRADED HYDRAULIC CONCRETE FRACTURE PARAMETERS BY PEAK-LOAD METHOD |
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| Affiliation: | 1.School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450011, China;2.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;3.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Based on the peak-load method, a simple way for getting fracture parameters of the fully-graded hydraulic concrete of a super-high arch dam is proposed. Using the finite element method, the formulas of stress intensity factors K, crack mouth opening displacement CMOD and crack opening displacement COD profile were determined for the non-standard wedge splitting specimens of fully-graded hydraulic concrete. The effective fracture toughness and critical crack tip opening displacement CTODc were experimental determined by proposed formulas. The successful use of non-standard wedge splitting specimens with different size but same in ratios of notch length and effective height reveals a great potential of the peak-load method in fully-graded hydraulic concrete. One only needs to measure the peak loads of distinctive specimens, and the fracture parameters of the fully-graded hydraulic concrete can be easily determined. |
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