Performance enhancement analysis of seismically isolated continuous bridge with shape memory alloy friction pendulum bearings
To improve the seismic performance of seismically isolated continuous bridge with friction pendu-lum(FP)bearings,a shape memory alloy friction pendulum(SMAFP)and multi-objective parameter optimi-zation method for seismically isolated continuous bridges were proposed.The mechanical model of SMAFP was derived.The numerical models of FP bearings and shape memory alloy(SMA)cables were created based on the OpenSees platform,and the accuracy of the numerical models were verified based on the test results.The numerical model of SMAFP was further achieved.Based on the verified numerical model,by selecting a three-span seismically isolated continuous bridge,the optimal design of isolation parameter for seismically iso-lated continuous bridge with SMAFPs was conducted based on the proposed optimization method.The applica-bility of the optimization method and the seismic performance of seismically isolated continuous bridge with SMAFPs were further investigated based on the optimum isolation parameters.Results show that the bearing residual displacements of seismically isolated continuous bridge with SMAFPs using optimum parameters are significantly reduced by 47.1％and 44.7％under two groups of earthquakes,respectively.The peak dis-placements of the main girder are reduced by 7.8％and 11.4％,respectively.The maximum increments of the base shear force and bending moment of the piers reach 8.8％and 9.6％,respectively.
万方数据
维普
