乌海甘德尔黄河大桥主桥设计

Design of Main Bridge of Huhai Gandeer Yellow River Bridge

乌海甘德尔黄河大桥主桥为跨径布置(80+5×120+80)m的单索面预应力混凝土梁部分斜拉桥。主梁采用带大挑臂的单箱双室截面,桥宽37 m。主梁悬臂板每隔3.5 m设置一道加劲板,箱室内部与此对应设置一道横隔梁。斜拉索采用环氧钢绞线拉索体系,索塔锚固区采用分丝管式索鞍。主塔为菱形截面,塔身为纵向A字型。结合平面和空间静力分析,对全桥的抗弯、抗剪、抗裂性能及应力进行检算,结果满足规范要求。项目处于地震高烈度带,结构中采用纵向速度锁定器+横向耗能减震装置作为组合减隔震方案,动力分析表明其抗震性能满足规范要求。主墩采用翻模法施工,主梁节段采用悬浇法施工。

The main bridge of Huhai Gandeer Yellow River Bridge is a single-plane pre-stressed concrete partial stable-stayed bridge with the span layout of(80+5 × 120+80)m.The long cantilever single-box double-chamber section is used for the main girder.The bridge is 37 m wide.The cantilever plate of the main girder is constructed with a stiffened slab every 3.5 m.A diaphragm is constructed corresponding to the inner of box and chamber.The stayed cable is the epoxy steel strand cable system.The wire tube type cable saddle is used in the cable pylon anchorage zone.The main pylon is the diamond section.The pylon body is the longitudinal shape A.Combined with the plane and spatial static analysis,the bending resistance,shear resistance,anti-split performance and stress are checked up.The results satisfy the norm requirements.The project is located in the high intensity seismic belt.The longitudinal velocity lock + transverse energy dissipation shock absorbers are taken as the combined isolation scheme for the structure.The dynamic analysis shows that its seismic performance can satisfy the norm requirements.The main pier is constructed by the turnover formwork method,and the main girder is constructed by the cast-in-place cantilever method.