Effect of sustained load on the bond performance between GFRP bars and marine concrete
In order to study the bond performance between GFRP bar and marine concrete under sustained load,16 GFRP bar-marine concrete beam specimens were designed and fab-ricated.The 120-day sustained load test was carried out under different sustained load levels(0%Pu,25%Pu,45%Pu and 65%Pu).The instantaneous slip and time-varying slip be-tween GFRP bar and marine concrete during the loading process were analyzed,and the time-varying slip models under different load levels were established.The size and variation of the slip between GFRP bar and concrete and of the slip between ordinary rebar and con-crete under continuous load were compared and analyzed.The test results show that the in-stantaneous slip increases with the increase of sustained load level,and the slip at the loading end is greater than that at the free end;the time-varying slip increases nonlinearly with time;the slip increases rapidly in the early stage and tends to be stable in the later stage;the laws of change of time-dependent slips between the two reinforcement materials and concrete are similar,but the slip between GFRP bar and concrete is much greater than that between ordinary rebar and concrete.
NETL
NSTL
万方数据
维普
