Research on Mechanical Properties of Cast-in-place Reinforced Concrete Beams Affected by Vibration
In order to study the influences of vibration on the load-bearing capacity,stiffness,form of cracking,stress state of rebar and tension and compression stress state of concrete during the widening of bridge without interruption of traffic,the experiment and theoretical study are carried out.The test of reinforced concrete beams with different length of post-cast section is carried out under vibration conditions,and the bond slip relationship between rebar and concrete is obtained,then the finite element numerical simulation is carried out.The results show that the decrease of bond performance in the post-cast section has no impact on the bearing capacity and stiffness of reinforced concrete beams.With the increase of the post-cast section lengths,the cracking area becomes smaller,the number of cracks are reduced,the length of rebar with same stress are longer in mid-span,the concrete compression area are increased,and the concrete tension areas are reduced.
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