Experimental study and numerical analysis of the flexural performance of key-tooth assembled prestressed concrete cap beam

The application of segmental precast assembled concrete cover beams in bridge construction is beneficial to promote low carbon, green and sustainable development of construction projects. To investigate the influence of the fabrication process of large key tooth joints on the shear performance of precast assembled concrete cover girders, the damage process of large key tooth assembled prestressed concrete cover girder specimens was investigated by using ABAQUS finite element analysis (FEA). The results show that: the section precast assembled concrete beams under four-point bending loading conditions, it is in the key tooth joint area that obvious cracking occurs; the finite element model of the large key tooth assembled prestressed cover beams can be effectively used to simulate the overall stress behavior of the beams; as the key tooth depth-to-height ratio increases, the stronger the connecting effect between the damaging key tooth and the positive key tooth is, and the load carrying capacity of the assembled beams is increased by 20% compared with the single key tooth, and ductility is increased by 30%; in the range of suitable reinforcement, the change of reinforcement rate does not have a significant effect on the stress performance of the beam.