POLYURETHANE CEMENT REINFORCEMENT FOR SEISMIC TESTING OF CURVED BEAM BRIDGES PIERS

Due to the "bending and torsion coupling" effect of curved bridges, the shear fracture and bending collapse of curved girder bridge piers and columns under the action of earthquakes are more likely to occur, resulting in the serious consequences of the overall collapse or overturning of the bridge structure. Polyurethane cement is a kind of reinforcement material used for structural seismic reinforcement in this case, which has excellent reinforcement performance. In this paper, based on the three-way shaking table test of curved girder bridge, OpenSees finite element software is used to establish the fiber unit model of the abutment specimen, and the model is used to carry out the parameter sensitivity analysis to investigate the influence of the height of abutment and polyurethane reinforcement on the seismic performance of polyurethane cement-reinforced abutment specimen, and it is known that, the higher the abutment is, the worse is the reinforcing effect of polyurethane cement; the higher is the thickness of polyurethane cement, the better is the reinforcing performance of polyurethane cement. The higher the abutment is, the worse the reinforcing effect of polyurethane cement is; the higher the thickness of polyurethane cement reinforcement is, the more obvious the effect of polyurethane cement reinforcement is. Based on the data of parameter sensitivity analysis, the parameters are optimized, and the most economical parameters are derived, thus providing sufficient theoretical basis for polyurethane cement reinforcement of curved beam bridge piers.