宽幅无风撑中承式连续梁拱组合桥总体设计

Overall Design of Wide Windless Bracing Half-through Continuous Beam Arch Composite Bridge

摘要:

重点介绍嘉峪关市金港路上跨清嘉高速公路桥梁的总体设计和技术特色。该桥采用宽幅无风撑中承式连续梁拱组合桥结构体系，桥位处地震烈度高，为有效减小地震作用对桥梁结构的影响，在拱脚处设置摩擦摆减隔震支座，与传统中承式无铰拱桥有较大区别，为国内首座无风撑中承式连续梁拱组合桥。主桥跨径布置为（22+65+22）m，桥宽36 m，主梁采用钢-混凝土组合梁，拱肋采用矩形薄壁钢箱，桥墩采用锥形实体墩，基础采用钻孔灌注桩基础。

Abstract:

Focus is on the overall design and technical characteristics of the bridge crossing the Qingjia Expressway in Jingang Road in Jiayuguan City. The bridge is a wide windless bracing half-through continuous beam arch composite structural system. The seismic intensity is high at the bridge location. In order to effectively reduce the impact of earthquake on the bridge structure, the friction pendulum seismic isolation bearings are installed at the arch feet, which is significantly different from the traditional half-through hinge free arch bridges. It is the first windless bracing half-through continuous beam arch composite bridge in China. The layout of the main bridge span is (22+65+22) m and the bridge is 36 m wide. The main girder is a steel-concrete composite girder. The arch ribs are thin-walled rectangular steel boxes. The bridge piers are the conical solid piers. And the foundation is a drilled cast-in-place pile foundation.