Experimental Research On Fatigue Of Concrete Beams With Adgesive Reinforcement At Different Fatigue Loading Frequency

There are three experimental beams using the same material in this test and all of the planting depths are 20d(=500mm). First, conduct the static test of a rebar-planting beam, then get the ultimate bearing capacity in the middle of the test beam at the situation that withstand bending moment and shearing force simultaneously, and make a comparison with the calculation formula of the specification, checking whether the formula of cast-on-site concrete beam is suitable for rebar-planting beam. Then according to the ultimate load of static load test to study the two same rebar-planting beam on fatigue test, analysis the change regulation of the material performance in different stages, comparing the change regulation of ultimate bearing capacity, deflection and stiffness after fatigue cyclic loading in the different frequencies. The study conclusions are as follows:1.By comparing the ultimate bearing capacity of static load test with the design values of whole-cast reinforcement beam, conclude that when the anchorage depth is 20 d, the bending capacity of anchorage beams meet the requirements.2.Fatigue loading has little effect on the ultimate bearing capacity of anchorage beams, but it change the faliure mechanism from cross-sectional bending failure to oblique section bending-shear failure at the ends of anchorage beams. So when calculate the bending capacity of anchorage beams, we should put sufficient attention on bending-shear failure at the ends of anchorage beams, besides the anti- uprooted capacity.3. Fatigue load anchorage beam fatigue cumulative damage caused by fatigue loading on the former’s 500,000 times.4.Within a certain frequency range, low- load on the beam anchorage cumulative damage caused slightly greater than the frequency of fatigue loading fatigue cumulative damage caused by the beam anchorage.