用RILEM方法得到混凝土断裂韧度的尺度律

黄杨; 王启智; 徐进

doi:10.13204/j.gyjz200808015

用RILEM方法得到混凝土断裂韧度的尺度律

doi: 10.13204/j.gyjz200808015

1.
1. 四川大学土木工程及应用力学系,成都 610065;
2.
2. 四川大学水利系,成都 610065

基金项目:

国家自然科学基金资助项目(10472075)

详细信息

作者简介:
黄杨男 1984年1月出生硕士.E-mail:qzwang2004@163.com

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- 文章访问数: 55
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- PDF下载量: 49
- 被引次数: 0
出版历程
- 收稿日期: 2007-11-14
- 刊出日期: 2008-08-20

THE SIZE EFFECT LAW OF FRACTURE TOUGHNESS FOR CONCRETE OBTAINED FROM RILEM METHOD

1.
1. Dept.of Civil Eng.and Applied Mechanics,Sichuan University Chengdu 610065;
2.
2. Dept.of Water Resource,Sichuan University Chengdu 610065

摘要

摘要: 用两种不同配合比的混凝土制作了几何相似的直裂缝矩形截面三点弯曲梁,在MTS 815材料试验机上测试这两种混凝土的力学参数并记录了三点弯曲试件的荷载-加载点位移和荷载-裂缝端口张开位移的全过程曲线。用最大荷载和初始裂缝长度求得的断裂韧度KIC存在明显的尺寸效应,对此问题,用材料与结构研究实验所国际联合会(RILEM)推荐的方法分别得到两种混凝土材料的真实断裂韧度和有效断裂过程区长度,从而确定了混凝土断裂韧度的尺度律公式。从该公式能直接得到材料大尺寸试件的断裂韧度和断裂过程区长度,还能预测同材料的试验室尺寸下几何相似试件的断裂韧度测试值。
- 混凝土 /
- 三点弯曲梁 /
- 断裂韧度 /
- 断裂过程区 /
- 尺度律
Abstract: Geometrically similar three-point bending beams with straight-through crack were prepared for concrete of two compositions.Through MTS 815 material test machine,mechanical parameters of two concretes were tested,and load vs.LPD(load point displacement) curves and load vs.CMOD(crack mouth opening displacement) curves of entire process were recorded for three-point bending specimens.There is a distinct size effect for fracture toughness K_(IC) calculated with maximum load and initial crack length.To cope with this problem,using the size-effect method recommended by RILEM(Runion Internationale des Laboratoires et Experts des Matriaux),the material true fracture toughness and effective length of the fracture process zone were obtained.The size effect law of fracture toughness for the two concrete materials is thus determined respectively.Fracture toughness and fracture process zone length can be seen from this formula for large-sized specimens of the same material.It can also be used to predict the fracture toughness for geometrically similar specimens to be tested in laboratory.
- concrete /
- three-point bending beam /
- fracture toughness /
- fracture process zone /
- size effect law

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参考文献(14)

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