高速铁路低高度系杆拱桥设计研究

为解决高速铁路在跨度及高度同时受限情况下,跨越既有建筑物的难题,文章结合津秦客运专线戴河桥设计实例,对跨度56 m、梁高1. 4 m的低高度简支系杆拱,在结构选择、变形刚度、系梁强度、拱肋强度、吊杆强度、动力仿真适应能力等方面进行了研究,研究结果表明结构可满足高速铁路运营要求。同时解决了低高度结构在箱梁截面矮梁高、小吊杆间距密情况下的横梁施工难题,梁端预应力张拉空间受限问题以及无砟轨道相邻梁端横向变形控制等问题。建议在高速、大跨条件下,桥梁可采用更加实用的低高度结构进行设计。

Design and Research on Low-height Tied Arch Bridge in High-speed Railway

In order to solve the problem of high-speed railway crossing over buildings under both span and height constraints, based on the design example of Daihe railway bridge on Tianjin-Qinhuangdao Passenger Dedicated Line,this paper studies structure selection, deformation rigidity, tie beam strength, arch rib strength, suspender strength and dynamic simulation adaptability of the low-height simply-supported tied arch bridge with a span of 56 m and a girder height of 1.4 m. The results show that the structure can meet operation requirements of high speed railway. Simultaneously it resolves beam construction of low-height structure under the condition of high short girder and close spacing between small suspenders in girder cross section, the limitation of prestressed tension space at the end of beam and lateral deformation control of adjacent beams of ballastless track. It is suggested that under the condition of high speed and large span, the bridge can be designed with more practical low height structure.