拉日铁路年楚河特大桥V形刚构加拱组合结构设计

拉日铁路年楚河特大桥主桥采用(60+148+60)m V形刚构加钢管混凝土拱组合结构,桥型结构新颖,详细介绍该桥型的设计特点,对主桥进行静力及动力分析,对承载能力、抗震、车桥动力响应等方面进行了详细计算。该桥将V形连续刚构和钢管混凝土拱桥2种体系有机结合在一起,使V构与拱在受力方面的优点得以充分发挥,既能保证安全舒适的行车,又满足了景观造型要求。

Design for Hybrid Structure of V-shaped Rigid-Frame plus Arch of Nianchu River Bridge on Lhasa-Shigatse Railway

The Nianchu River Bridge,a super major bridge with a novel style structure,perches on the Lhasa-Shigatse Railway.Its main bridge is made up of a hybrid structure of V-shaped rigid frame plus concrete-filled steel tube arch with a span arrangement of(60+148+60) meters.The paper elaborates the design features of this bridge type,carrying out static and dynamic analysis for the main bridge,and calculating the load capacity,seismic resistance,vehicle-bridge dynamic response and other structural factors in detail.This bridge is an organic integration of V-shaped continuous rigid frame with concrete-filled steel tube arch,making full use of the advantages on structural behaviors of both the V-shaped rigid frame and the arch.Thus this bridge not only can meet the requirements on safety and on riding comfort of the train,but can be harmonious with the natural landscape around as well.