摘要
宜昌长江铁路大桥主桥采用 130m +2× 2 75m +130m预应力混凝土连续刚构与钢管混凝土柔性拱组合桥式结构 ,大桥全长 2 4 4 6m ,桥型与跨度在世界铁路桥梁中均居领先地位。研究了 130m +2× 2 75m +130m刚构拱受力特性、承载能力、非线性、抗震、车桥动力响应等结构特性。研究结果表明 ,该新型组合桥梁结构 ,梁拱共同受力 ,结构弯矩效应主要表现为拱受压、梁受拉的受力特性 ,主梁承受弯矩及截面尺寸显著减小 ,拱的水平推力与梁的轴向拉力相互平衡 ,使拱与梁在受力方面的优点得以充分发挥 ,结构竖向刚度大 。
The Yangtze River Bridge in Yichang is a railway bridge with a total length of 2 446 m, which is unique in the style and greatest span in the world. The main bridge with the spans arranged as (130+2×275+130) m is a combined structure composed of prestressed concrete continuous rigid frame and concrete-filled steel tubular flexible arch. The paper summarizes the systemic analysis and research results on continuous rigid frame-arch bridge, which is the study of the performance of the structure against forces, ultimate carrying capacity, nonlinear analysis, seismic resistance, coupled vibration of vehicle and bridge. As a new combined bridge, it has the following features:Girder and arch resisting forces together;Moment and size of girder decrease dramatically due to the arch under compression and the girder under tension;The bridge type brings the girder and arch on resisting forces into full play, because the forces are balanced between the horizontal thrusts of the arch and axial tension of girder;Great in vertical stiffness and slender in appearance; The adoption of the new bridge type will promote the development of technology for long span railway bridge.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2004年第2期57-62,共6页
Journal of Railway Science and Engineering
