设置摩擦摆隔震支座的中小跨径桥梁抗震计算研究  

Research on Seismic Calculation of Small and Medium Span Bridges with Friction Pendulum Seismic Isolation Bearing

作　　者：马力雄 MA Li-xiong(China Design Group Co.Ltd.,Nanjing 210014,China)

机构地区：[1]华设设计集团股份有限公司,南京210014

出　　处：《工程建设与设计》2024年第19期85-88,共4页Construction & Design for Engineering

摘　　要：为研究设有摩擦摆隔震支座中小跨径桥梁的抗震性能,基于Midas软件建立跨径25 m、墩高7 m的现浇梁桥模型。采用不同的支座模拟方式,分别计算E1地震下的支座水平力、柱桩强度,E2地震作用下支座工作状态、隔震性能。结果表明:E1地震作用下,设有固定、横向滑动支座的桥墩承担较大水平力,支座横向水平承载力需提高,达到“抗小震”目标;E2地震作用下,支座螺栓剪断,支座、墩柱承受的水平力减小,达到“减大震”的目标;宜设置强度较高、刚度较大的桥墩用于抵抗支座螺栓剪断力。In order to study the seismic performance of small and medium span bridges with friction pendulum seismic isolation bearing,a cast-in-place girder bridge model with span of 25 m and pier height of 7 m was established based on Midas software.Using different bearing simulation methods,this paper calculates the horizontal force of the bearing and the strength of the pier pile foundation under E1 earthquake,and the working state and isolation performance of the bearing under E2 earthquake.The results show that under E1 earthquake,piers with fixed and lateral sliding bearings bear larger horizontal forces,and the lateral horizontal bearing capacity of the bearings should be improved to achieve the goal of“small earthquake resistance”.Under the action of E2 earthquake,the bearing bolt is cut,the horizontal force borne by the bearing and pier column is reduced,and the goal of“reducing large earthquake”is achieved.Piers with high strength and stiffness should be set up to resist the shear force of bearing bolts.

关 键 词：中小跨径桥梁 摩擦摆支座 抗震性能 支座螺栓剪断力 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]