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依托新津河大桥抗震设计工程实例,详细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。结果表明,对于中小跨度多跨连续梁桥,采用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,但支座位移较大。文中随后在减隔震设计中增加了黏滞阻尼器,并选择了恰当的设计参数,计算结果表明,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。
Based on the seismic design project of Xinjinhe Bridge, the design process of shock absorption and isolation is elaborated. In the process of design, the program of basin bearing + friction pendulum support and the solution of basin bearing + friction pedestal + viscous damping were put forward, and the nonlinear time history analysis of two schemes was carried out respectively by Midas Civil. The results show that the seismic response of the substructure can be effectively reduced by the frictional reduction of the seismic isolation for the small span multi-span continuous girder bridges, so that the main components of the bridge remain elastic under the action of large earthquake but the displacements of the bearing are larger. Then, the viscous damper is added to the seismic isolation design and the proper design parameters are selected. The calculation results show that the displacement response of the viscous damper support is obviously reduced. The comprehensive calculation results show that the friction pendulum bearing with the use of viscous damper, can achieve a more ideal damping, isolation effect.