Abstract: The testing technology of parallel grooving method to test the existing stress of concrete was studied. The influence of different initial stress, cutting mode, cutting depth and other parameters on the stress release efficiency were theoretically simulated and analyzed, and the specimen test experiments were carried out. Through the loading test of the removed 20 m post tensioned prestressed concrete slab beam, the existing prestressed condition of the member was measured. The stress release test of grooving method was carried out to obtain the surface compressive stress test value of grooving method. The research results show that: through the grooving method to test the surface stress of concrete members, when the cutting depth reaches 1/3 of the groove spacing, the normal stress on the member surface can be released, and the maximum normal stress release test value of the solid beam members can reach about 80% of the actual normal stress value.

Key words: bridge engineering; grooving method; existing stress of concrete members; loading test; test parameters

摘要： 针对平行切槽法测试混凝土构件现存应力的测试技术开展研究，理论模拟分析了不同初始应力、切槽方式、切槽深度等参数对应力释放效率的影响，并进行试件测试实验。利用拆除下的20 m后张预应力混凝土板梁构件进行加载试验，测得构件现存预应力状况，进行切槽法应力释放测试试验，获取切槽法表面压应力测试值。研究结果表明：利用切槽法进行混凝土构件表面应力测试，切槽深度达到切槽间距的1/3时，可完成构件表面正应力的释放，实梁构件的最大正应力释放测试值可达到实存正应力值的80%左右。

关键词: 桥梁工程;切槽法；混凝土构件现存应力；加载试验；测试参数