Abstract: Relying on the engineering example of Xinjin River Bridge seismic design, the design process of seismic damping and isolation was elaborated. In the design process, the program of pot bearing + friction pendulum bearings and the program of pot bearing + friction pendulum bearings + viscous damping were successively proposed and the nonlinear time-history analysis of two programs was respectively carried out by Midas civil. The analysis results show that for small and medium multi-span continuous bridge, the seismic damping and isolation of friction pendulum can effectively reduce the seismic internal force response in the lower part of the structure, which makes the main components of the bridge still remain flexible under earthquake. However, the displacement of bearings of seismic isolation bridge was often larger under earthquake, so viscous dampers were added in seismic isolation design and the appropriate design parameters were selected. The calculation results show that the displacement response of bearing is significantly reduced after the use of viscous damper. Comprehensive calculation results show that the combination use of friction pendulum together with viscous dampers can achieve good seismic damping and isolation effect.

Key words: bridge engineering, seismic isolation design, friction pendulum, viscous dampers, nonlinear dynamic time-history analysis

摘要： 依托新津河大桥抗震设计工程实例，阐述了减震和隔震的设计过程。在设计过程中，先后提出了盆式支座+摩擦摆支座方案和盆式支座+摩擦摆支座+黏滞阻尼方案，并用Midas Civil分 别对两种方案进行了非线性时程分析，分析表明：对于中小跨度多跨连续梁桥，摩擦摆减隔震可以有效降低下部结构的地震内力响应，使得桥梁的主要构件在大震作用下仍保持弹性。然而， 隔震桥梁在地震作用下支座位移往往较大，因此在隔震设计中增加了黏滞阻尼器，并选择了恰当的设计参数，计算表明使用黏滞阻尼器支座后位移响应降低明显。综合计算结果表明：摩擦摆 支座配合使用黏滞阻尼器，能够达到较为理想的减震、隔震效果。

关键词: 桥梁工程, 减隔震设计, 摩擦摆支座, 黏滞阻尼器, 非线性动力时程分析