Influence of Crack-depth Ratio on Fracture Features of Different Strength Grade of Concrete

胡少伟; 范向前; 陆俊

doi:10.13409/j.cnki.jdpme.2013.02.007

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Influence of Crack-depth Ratio on Fracture Features of Different Strength Grade of Concrete

更新时间：2025-12-11

- Influence of Crack-depth Ratio on Fracture Features of Different Strength Grade of Concrete
- Vol. 33, Issue 2, Pages: 162-168(2013)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2013.02.007
  CLC： V431
- Published：2013
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[1]胡少伟,范向前,陆俊.缝高比对不同强度等级混凝土断裂特性的影响[J].防灾减灾工程学报,2013,33(02):162-168.

胡少伟, 范向前, 陆俊. Influence of Crack-depth Ratio on Fracture Features of Different Strength Grade of Concrete[J]. 2013, 33(2): 162-168.
[1]胡少伟,范向前,陆俊.缝高比对不同强度等级混凝土断裂特性的影响[J].防灾减灾工程学报,2013,33(02):162-168. DOI： 10.13409/j.cnki.jdpme.2013.02.007.

胡少伟, 范向前, 陆俊. Influence of Crack-depth Ratio on Fracture Features of Different Strength Grade of Concrete[J]. 2013, 33(2): 162-168. DOI： 10.13409/j.cnki.jdpme.2013.02.007.

摘要

采用我国水工混凝土断裂试验规程推荐的双K断裂模型

确定C25、C35在缝高比0.2～0.5范围内的断裂参数

研究了两种强度等级下缝高比对混凝土断裂特性的影响。试验结果表明

试件的荷载值随着缝高比的增加而逐渐降低;缝高比为0.3或0.4的三点弯曲梁混凝土试件相对韧度较好;缝高比从0.2变化到0.5的范围内

混凝土试件起裂韧度值、失稳韧度值变化不大

起裂韧度和失稳韧度均可认为是一个常数;强度等级越高

断裂能越大

且断裂能随缝高比的变化而变化

缝高比为0.3或0.4时

混凝土试件的断裂能最大。

Abstract

Double-K fracture model which is recommend by Norm for fracture test of hydraulic concrete of China was used for determining the fracture parameters of concrete specimens（C25

C35）

when the initial crack-depth ratios ranging from 0.2 to 0.5 and the influence of different crack-depth ratios on fracture features for two strength grade concrete was studied.The results show that the initial load and the maximum load of concrete decrease with the increase of initial crack-depth ratios

the toughness of three-point bending beam′s concrete specimen is better when the initial crack-depth ratio is 0.3 or 0.4

the values of initiation toughness and unstable toughness change little and both can be considered as constant.The higher the strength grade

the greater the fracture energy.The fracture energy varies with the crack-depth ratio

and gets a maximum when crack-depth ratio is 0.3 or 0.4.

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references

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