复杂艰险山区高速铁路桥梁设计创新

Design Innovations of High-speed Railway Bridge in Complex and Dangerous Mountain Area

复杂艰险山区地形险峻、地质复杂、交通不便、施工场地狭窄,且高速铁路技术标准高、曲线半径大,给艰险山区高速铁路桥梁设计带来了巨大挑战。本文针对艰险山区高速铁路桥梁亟需解决的高墩大跨桥梁刚度控制标准,桥墩抗震延性分类标准、抗剪设计和桥梁减隔震设计方法,厚壁空心混凝土结构温度场和徐变,桥墩泥石流冲击力等关键技术问题开展研究,提出了艰险山区大跨梁桥、拱桥、斜拉桥刚度控制标准和混凝土桥梁收缩徐变改进预测模型,建立了铁路桥墩抗震延性分类标准、铁路桥梁减隔震设计体系,桥墩延性抗剪设计、厚壁空心结构温度场和桥墩泥石流冲刷力的计算方法。以上研究成果为艰险山区高速铁路桥梁修建提供了重要的技术支撑。

The complicated and dangerous mountainous area is characterized by steep terrain,complicated geology,inconvenient traffic and narrow construction site,in addition the technical standard for high-speed railway is high and the curve radius is large,which brings great challenges to the design of high-speed railway bridges in complicated and dangerous mountainous areas.In this paper,key technical problems urgently needed to be solved for high-speed railway bridges are studied,such as high pier and long span bridge rigidity control standard,pier ductility classification standard,shear design and bridge isolation design method,temperature field and creep of thick-walled hollow concrete structure and pier impact resistance to debris flow in complicated and dangerous mountainous areas,the stiffness control standards are put forward for long-span beam bridges,arch bridges and cable-stayed bridges in mountainous areas and the improved prediction model of shrinkage and creep of concrete bridges are developed and the classification standards of seismic ductility of railway piers,seismic isolation design system of railway bridges,the ductility shear design of piers and calculation methods of temperature field of thick-walled hollow structures and the piers scouring resistance to debris flow are established.The above study achievements has provided significant technical supports for the design and construction of high-speed railway bridges in complicated and dangerous mountainous area.