摘要
为研究混凝土的楔入劈拉断裂特性,采用扩展有限元法数值模拟了不同缝高比、不同截面高度的混凝土楔入劈拉试件断裂过程,研究了混凝土楔入劈拉试件裂缝扩展特性和尺寸效应。结果表明,起裂韧度受初始缝高比和试件截面高度的影响较小,但不具有明显的尺寸效应;当缝高比大于0.5或截面高度大于500mm时,失稳韧度才不具有尺寸效应。结果可为混凝土断裂特性研究提供参考。
In order to study on the fracture characteristics of concrete＇s wedge splitting tensile test,the extended finite element method（XFEM）had been used to simulate cracking process of concrete wedge splitting tensile specimen under the conditions of different seam height ratio and section height.The fracture characteristics and size effect of concrete wedge splitting tensile specimen were studied.The results show that the height of the initial seam height ratio and specimen height has little impact on the fracture toughness,but the size effect phenomenon is not obvious;when the seam height ratio is greater than 0.5or the cross section height is greater than 500 mm,its instability toughness has not the size effect.The results of the study provide reference for the fracture properties analysis of concrete.
出处
《水电能源科学》
北大核心
2016年第5期120-123,共4页
Water Resources and Power
基金
国家杰出青年科学基金项目(51325904)
国家自然科学基金项目(51279111)
江苏省第四期"333工程"培养资金资助项目(BRA2014324)
