Influence of self-weight on the fracture properties of three-point bending concrete beams

被引：0
|
作者：
Yin Y.-Y. [1 ]
Hu S.-W. [2 ,3 ]
Wang Y.-H. [2 ]
机构：
[1] College of Civil and Transportation Engineering, Hohai university, Nanjing
[2] College of Civil Engineering, Chongqing university, Chongqing
[3] Nanjing Hydraulic Research Institute, Nanjing
来源：
Gongcheng Lixue/Engineering Mechanics | 2019年 / 36卷 / 07期
关键词：
Concrete; Double-K fracture model; Initial crack mouth opening displacement; Self-weight; Three-point bending beam; Unstable fracture toughness;
D O I：
10.6052/j.issn.1000-4750.2018.08.0458
中图分类号：
学科分类号：
摘要：
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 (KIC un)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 KIC un 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 KIC un 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. © 2019, Engineering Mechanics Press. All right reserved.
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页码：48 / 56and108
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