We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
自重对混凝土三点弯曲梁断裂性能的影响.
- Authors
尹阳阳; 胡少伟; 王宇航
- Abstract
Self-weight has a significant influence on the fracture properties of beams under three-point bending (TPB). However, the influence of initial crack mouth opening displacement (CMODini) caused by self-weight was rarely considered in previous research on concrete fracture properties based on TPB beams. To investigate the influence of CMODini on the fracture properties of TPB beams, a calculation formula of CMODini, effective crack length (ac) and unstable fracture toughness ( KunIC )considering the influence of CMODini are presented. The calculated results of the formula were compared with the experimental data of specimens of different sizes and initial crack-depth ratios. The results indicate that CMODini is slightly influenced by the specimen sizes. The influence of the self-weight on CMODini, ac and KunIC is less than 5% even if the specimen size is 2200 mm×550 mm×240 mm and the initial crack-depth ratio is 0.4. CMODini is greatly influenced by the initial crack-depth ratio. The influence increases with the increase of the initial crack-depth ratio. Moreover, the influences of the self-weight on CMODini, ac and KunIC are 24.26%, 1.73% and 17.31%, respectively, when the specimen size is 1143 mm×305 mm×76 mm and the initial crack-depth ratio is 0.818. Therefore, the influence of CMODini caused by the self-weight of TPB beams should be taken into account when both the specimen size and the initial crack-depth ratio are large.
- Publication
Engineering Mechanics / Gongcheng Lixue, 2019, Vol 36, Issue 7, p48
- ISSN
1000-4750
- Publication type
Article
- DOI
10.6052/j.issn.1000-4750.2018.08.0458