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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 .
In order to study the crack propagation process under the fatigue load, the optical crack propagation method was used to stabilize the prefabricated cracks in the wedge splitting specimens with dimensions of 200 mm × 200 mm × 200 mm until the failure instability The whole process of a systematic study and the use of a camera filming the whole process of crack propagation shown by the photoelastic patch has been a complete and intuitive observation results of the concrete crack length increases steadily with the increase of the number of fatigue.According to the light bomb paste The results also show that the main shear strain distribution near the crack tip of the concrete under the fatigue load is measured.The results show that the crack propagation of the concrete under the fatigue load can be effectively measured by the photoelastic patch method.