关键词: 混凝土环片, 循环载重试验, 振弦式钢筋计

Abstract: This study is used to verify the suitability of conventional rebar strain meter to monitor the behaviour of shield segment. Four vibrating wire rebar strain meters and thermistors are installed in a steel cage of test segment before concrete placement, steam and water curing. Both temperature and strain of rebar are recorded through out the manufacturing process. The results indicate that the variation of rebar strain is consistent with the temperature. Then, this test segment is tested by cyclic two points loading, in which the strains of rebar and deflections at center point on both sides of test segment are also monitored. The samples of rebar and concrete cylinder are tested in lab to produce the stress-strain relations, respectively. The comparison of moments and deflections of segment during cyclic loading between analytical solutions and measured results are presented in this paper. The results indicate that the conventional rebar strain meters are not only intact after extreme curing processes but also functioning well during cyclic loading.

Key words: precast reinforced concrete segment, cyclic loading, vibrating wire rebar strain meter