【摘要】 为了研究高墩隔震连续梁桥的抗震及减震性能,以某实际跨海高墩连续梁桥为试验研究对象,设计制作与原模型同材料1∶10的试验模型,分别采用铅芯橡胶隔震支座、高阻尼橡胶隔震支座和摩擦摆隔震支座3种减震方式,进行高墩隔震连续梁桥的地震模拟振动台试验,设计了拼接式桥墩拼接处剪力测试方法,研究了该实际跨海大桥所在场地120年一遇、600年一遇、1 200年和2 400年一遇地震的地震波输入时,不同隔震方式对桥墩墩顶加速度、桥面加速度、桥墩墩顶剪力、桥墩拼接处剪力、墩底混凝土应变、墩底钢筋应变的影响。试验结果表明:只要隔震支座参数设计合理,3种减震方式均能有效减小桥梁的动力响应,隔震后在2 400年一遇地震时整个桥墩处于弹性状态;摩擦摆隔震支座屈服前刚度最大,需根据地震波输入强度合理设计屈服力才能起到减震作用;设计的拼接式桥墩拼接处剪力测试方法可有效测试拼接处的剪力,为拼接处拼接件的设计提供了设计依据。更多还原

【Abstract】 In order to investigate the seismic and energy dissipation performance of continuous isolation girder bridge with high piers,an actual continuous girder bridge with high piers was taken as the subject of experimental study and an experimental model of 1∶10 was designed and made with the same material as the actual bridge.Then shaking table tests for seismic simulation on the continuous isolation girder bridge with lead laminated rubber bearings(LRB),highdamping rubber bearings(HDRB)and friction pendulum bearings(FPB)were carried out,and the measurement for shear at connection of piers was presented.The effects of different isolation strategies on the acceleration on the top of the pier,acceleration of superstructure,shear on the top of the pier,shear at the connection of piers,concrete stain and rebar strain at the bottom of the pier were studied under different seismic wave inputs with 120 years,600years,1200 yearsand 2400 years frequency.The results show that three isolation strategies can all obtain outstanding damping effects and decrease the responses of bridge when parameters of isolation devices were designed reasonably.Furthermore,the pier remains elastic state under earthquake with 2 400 years frequency after isolation.The stiffness of friction pendulum bearing is largest before yield.Therefore,the yield force of friction pendulum bearing should be reasonably designed according to the strength of seismic wave input,and then the energy dissipation adopting friction pendulum bearing will be of good effect.The designed measurement for shear at the connection of piers can effectively obtain the shear,which provides the basis for the design of components at the connection of piers.更多还原