混凝土断裂能的尺寸效应及测定方法研究  

On Size Effect and Determining Method of Concrete Fracture Energy

作　　者：杨松森[1] 郑少瑛[1] 赵铁军[1] 徐菁[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《水运工程》2008年第7期19-22,49,共5页Port & Waterway Engineering

基　　金：国家自然科学基金项目(50378045)

摘　　要：从局部断裂能分布的双直线模型出发,给出了混凝土真实断裂能和受尺寸影响的断裂能的关系式,进行了4组不同尺寸试件的楔形劈裂实验,求得不受尺寸影响的混凝土真实断裂能,从而为确定混凝土的断裂能提供了一种实践可行的测试方法。实验结果同时也表明,断裂能属于混凝土本身的材料特性,对于同一材料,断裂能值是恒定的,而断裂能之所以具有尺寸效应,是由于局部断裂能在断裂韧带上的非均匀分布引起的。Based on a bilinear model for the local fracture energy distribution along the concrete ligament, the expression reflecting side-independent fracture energy and size-dependent fracture energy is proposed. Wedge splitting test for four sets of concrete specimen with different size is carried out. Side-independent fracture energy is finally obtained. Thus a practicable method for determining fracture energy is proposed. Experiment results also show that the fracture energy, which belongs to material character, is virtually constant for the same material, whereas the non-constant local fracture energy distribution is the main reason for the size effect in fracture energy.

关 键 词：断裂能 断裂韧带 尺寸效应 楔形劈裂实验 方法 

分 类 号：TU502.6[建筑科学—建筑技术科学]