非标准混凝土楔入劈拉试件断裂参数试验研究与尺寸效应分析  

Experimental Research and Size Effect Analysis of Fracture Parameter of Nonstandard Wedge Splitting Tensile Specimen

作　　者：胡少伟[1] 谢建锋[1] 

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210024

出　　处：《水电能源科学》2015年第5期105-108,共4页Water Resources and Power

基　　金：国家高技术研究发展计划(863计划)课题(2012AA112510)

摘　　要：采用跨高比和初始缝高比恒定的非标准混凝土楔入劈拉试件,按照改进的试验加载装置进行试验可抵消竖向力的作用。以双K断裂理论为基础,采用紧凑拉伸试件的断裂韧度公式计算得到非标准楔入劈拉试件的断裂参数,并利用通用有限元软件ANSYS对试验计算结果进行验证。结果表明,采用紧凑拉伸试件计算公式和有限元方法均能准确计算非标准楔入劈拉试件的断裂韧度,两种方法误差仅为3%;在截面高度300~600mm范围内,起裂断裂韧度基本不随试件截面高度的变化而变化,失稳韧度在截面高度大于500mm时不具有明显尺寸效应。Non-standard wedge splitting tensile specimens with the same span and initial crack-depth ratios were fin- ished using the improved test loading device, which can offset the effects of the vertical force. The non-standard wedge splitting tensile specimen fracture parameters were calculated by using the compact tension specimen＇ s formula, and the general finite element software ANSYS is used to validate the result of the test. It shows that using compact tension spec- imen calculation formula and finite element method can accurately calculate the fracture toughness of the non-standard wedge splitting tensile specimens, and the error is only 3; ; in the cross section height 300 mm to 600 mm range, the in- itial fracture toughness show little change, the unstable fracture toughness increases with the grow of specimen height when the depth of section is less than 500 mm, hut it appears no size effect when the cross section height is greater than 500 mm.

关 键 词：楔入劈拉试件 不同截面高度 双K断裂韧度 有限元方法 尺寸效应 

分 类 号：TV313[水利工程—水工结构工程]