Fracture Energy Analysis of Concrete considering the Boundary Effect of Single-Edge Notched Beams
|Médium:||article de revue|
|Publié dans:||Advances in Civil Engineering, 2018, v. 2018|
The method of determining concrete fracture energy recommended by RILEM has an obvious size effect, so determining fracture energy that is unaffected by size of the test specimen is difficult. In this study, 60 high-strength concrete single-edge notched beams (SENBs) of different sizes, crack length-to-depth ratios, and span-to-depth ratios were subjected to the three-point loading test as recommended by RILEM. Then, the influences of the boundary effect on the fracture energy were identified. Based on the SENB boundary effect model, a piecewise function of the interrelationships between the experimental test fracture energy , the local fracture energy , and the fracture energy unaffected by specimen size was established. The applicability of the boundary effect model was verified using the test results from this study and from the previously published research. The results show that the local fracture energy distribution in the boundary influence region was nonuniform. The smaller the local fracture energy was, the closer it was to the rear boundary of the specimen. The influence length of the boundary increased with the increasing specimen size. Based on the bilinear distribution model of the local fracture energy , the fracture energy unaffected by beam size can be obtained according to the fracture energy measured for laboratory-scale small-sized SENB specimens. Furthermore, the model predictions are in good agreement with experimental observations.
|Copyright:||© 2018 Ping Xu et al.|
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