（1 河北工业大学土木与交通学院， 天津 300401； 2 天津市华水自来水建设有限公司， 天津 300122）

［摘要］受弯状态下植筋结构疲劳损伤影响其失效机理的研究相比于静载拉拔试验方面的研究明显不足。通过比较3组不同植筋深度的受弯植筋梁疲劳试验结果，分析了疲劳与静载试验现象的异同。疲劳试验采用的应力比为0-56，试件经200万次循环加载后静力加载至破坏。分析疲劳试件挠度与循环加载次数的关系，得出不同锚固深度试件的疲劳变形计算式。研究试件应力-循环加载次数曲线，得到不同锚固深度试件经疲劳加载后的应力计算式。结果表明：随植筋深度增加，疲劳加载对试件变形、应力的不利影响在逐渐减小；疲劳加载对植筋梁造成的损伤集中在前50万次循环加载。与静载试验相比，疲劳加载会使试件破坏形态发生改变，疲劳荷载使得植筋端头处成为新的薄弱位置。疲劳加载时，植筋深度达到25d时钢筋才会屈服，试件发生塑性破坏。

［关键词］植筋； 疲劳损伤； 锚固深度

中图分类号：TU375文献标识码：A文章编号：1002-848X(2018)01-0058-04

Experimental study on fatigue damage of flexural rebar-planting beams

Yan Xikang1, Liang Linxiao1, Zhang Yucong2, Wei Xinglei1, Tao Jianwei

(1 School of Civil and Transportation Engineering， Hebei University of Technology， Tianjin 300401，China; 2 Tianjin Huashui Water Supply Construction Co.， Ltd.， Tianjin 300122， China)

Abstract:The study on the failure mechanism of rebar-planting structure impacted by fatigue damage under the bending condition is obviously less than that under the static load pullout test. By comparing the fatigue test results of 3 groups of rebar-planting beams under different planting depths, the similarities and differences between fatigue and static loading tests were analyzed. The stress ratio of fatigue test was 0-56, and the specimens were subjected to static loading to failure after 2 million cycles. The relationship between the deflection of fatigue specimens and the number of cyclic loading was analyzed, and the formulas for calculating the fatigue deformation of  specimens with different anchorage depths were obtained. The stress-cyclic loading frequency curve of specimens was studied, and the fatigue stress calculation formula of  specimen by fatigue loading with different anchorage depths was obtained. The results show that the adverse effects of fatigue loading on the deformation and stress of the specimens decrease gradually with the increase of the depth of the rebar-planting; the damage caused by fatigue loading on the rebar-planting beams is concentrated in the first 500 thousand cycles. Compared with the static load test, the fatigue loading changes the failure mode of the specimens, and the fatigue load makes the end of the planting rebar become a new weak position. When the rebar-planting depth reaches 25d, the rebar yields and the specimen has plastic failure under fatigue loading.

Keywords:rebar-planting; fatigue damage; anchorage depth

*河北省建设科学技术研究计划（2014-124）。

作者简介：阎西康，博士，教授，博士生导师，Email:tjsyxk@163.com。