摘要
为了研究疲劳荷载作用下砼裂缝扩展过程 ,本文采用光弹贴片法对尺寸为2 0 0 mm× 2 0 0 mm× 2 0 0 mm的楔入劈拉试件预制裂缝稳定扩展直至失稳破坏全过程进行了系统的研究 ,并采用照相机拍摄了光弹贴片所显示的裂缝扩展全过程 ,得到了砼裂缝长度随疲劳次数的增加而稳定扩展的完整而直观的观测结果 .根据光弹贴片所显示的彩色条纹序列 ,还测得了疲劳荷载作用下砼裂缝尖端附近的主剪应变差分布 .试验表明 ,采用光弹贴片法可有效地测定疲劳荷载作用下砼裂缝扩展过程 .
Photoelastic coating method was used to investigatioe the propagation process of a crack in concrete under fatigue loading. Wedge splitting specimens with dimension of 200mm×200mm×200mm are employed. The whole process of stable propagation and unstable development of the main crack was recorded by photographic pictures, and based on the coloured striae sequence, the strain distribution around the crack tip were also obtained. Test results demonstrated that photoelastic coating method was effective for this research.
出处
《实验力学》
CSCD
北大核心
2000年第3期286-292,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金资助项目!( No. 5960 90 0 2 )
关键词
砼
疲劳
断裂
裂缝
光弹贴片法
concrete
fatigue
fracture
crack
photoelastic coating
