国道105东阿黄河大桥总体设计

Overall Design of Dong'e Yellow River Bridge in National Highway 105

摘要:

国道105东阿黄河大桥跨越黄河主桥采用（60+190+328+278+180+60）m多塔非对称混合梁部分斜拉桥，主梁采用单箱三室大悬臂截面，悬臂板下设置隔板加劲，桥面全宽35 m，在328 m中跨设置84 m长的钢箱梁段，钢梁与混凝土梁之间设置钢混结合段连接；桥塔采用纵向分叉的人字形独塔，塔梁固结；主桥墩柱采用箱型墩，顶部纵向设置双排支座，墩柱迎水面设置破冰体，基础采用直径2.0 m钻孔灌注桩；斜拉索采用平行钢绞线，中央索面双排布置，塔顶设置可换索式鞍座，梁端锚固采用齿块锚固于中间箱室。静力计算结果表明，该桥各构件变形、应力、裂缝宽度以及斜拉索安全系数等指标均满足规范要求。比较了3种减隔震体系的地震效应，选定弹性约束支座体系作为该桥的减隔震体系，动力计算结果均满足规范要求。

Abstract:

The main bridge of Dong'e Yellow River Bridge across the Yellow River in National Highway 105 is a (60+190+328+278+180+60) m multi-pylon asymmetrical composite beam partial cable-stayed bridge. The girder is a single-box three-chamber large-cantilever section, and a partition plate is set under the cantilever plate for reinforcement. The total width of bridge deck is 35 m. An 84 m-long steel box girder segment is set at the 328 m mid span. A steel-concrete composite segment is connected between the steel beam and the concrete beam. The bridge pylon is a vertically branched herringbone-shaped single pylon, and the pylon and the girder are consolidated. The main bridge piers are the box-type piers. The double-row supports are set longitudinally at the top. The ice breaking bodies are set on the upstream face of the pier columns. The diameter-2.0 m cast-in-site pile is used for the foundation. The stayed cable is the parallel steel strands. The central cable plane is arranged in double rows. A replaceable cable saddle is installed at the top of the pylon. The beam end is anchored to the middle box chamber with toothed blocks. The static calculation results show that the deformation, stress and crack width of each component, the safety factor of stayed cable and the other indexes of this bridge all meet the standard requirements. After comparing the seismic effects of three types of seismic isolation systems, the elastic constrained support system is selected as the seismic isolation system of this bridge. The dynamic calculation results all meet the standard requirements.