淡江大桥主桥设计

淡江大桥主桥跨越淡水河口,主桥采用单塔不对称半飘浮体系斜拉桥,全长920 m,跨径布置为(2×75+450+175+75+70)m,主跨450 m,桥面净宽44.7 m,桥下通航净高20 m,倒Y形桥塔高200 m。在桥塔及两端伸缩缝处的桥墩设置减隔震阻尼器,主梁采用钢箱梁(长660 m)及钢-混结合梁(长260 m),斜拉索按扇形双索面布置,共94根斜拉索。桥梁设计寿命为120年,依据基于性能的设计规范AASHTO LRFD及性能化抗震设计,结构强度满足规范要求。采用风洞试验与数值风力分析验证主桥结构的气动稳定性,结果表明当风速达100 m/s时,结构仍然稳定。

Designing the Main Bridge of Danjiang Bridge

The main bridge of Danjiang Bridge crossing the mouth of Tamsui river in Taiwan.The main bridge is an asymmetric cable-stayed bridge with a single pylon and semi-floating system,total length of 920 m and span arrangement(2×75+450+175+75+70)m,which has a main span of 450 m,net deck width of 44.7 m,navigation clearance of 20 m,and an inverted-Y pylon of 200 m.Seismic isolation damping devices are provided in pylon and both piers at expansion joint.Main girder consists of steel box girder(660 m)and steel-concrete composite girder(260 m),and cable-stayed system is a double-plane fan layout with total 94 No.stay cables.The service life of 120 years is designed for the bridge.Following the performance-based design code(AASHTO LRFD)and performance-based seismic design,the strength of structure is to meet the requirement of code.Wind tunnel test and numerical analysis are adopted to verify aerodynamic stabilities,and the structure is still stable when wind speed reaches up to 100 m/s.