铁路纵向Y型桥墩设计关键技术研究  

Research of Key Technologies of Railway Longitudinal Y-type Bridge Pier Design

作　　者：仝波 陈杰[1] Tong Bo;Chen Jie(China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《铁道勘察》2020年第4期120-122,129,共4页Railway Investigation and Surveying

摘　　要：为解决某高速铁路联络线桥梁孔跨调整的问题,设计采用纵向Y型桥墩,避免了重要管线迁改。通过查阅文献,采用杆系单元和实体单元的数值模拟方法,分析了纵向Y型桥墩的受力特点,包括纵向线刚度、立柱疲劳应力、墩顶受拉区应力以及对两侧简支梁挠度的影响等。研究表明:通过增加桩基的纵向间距来提高基础的抗弯刚度是提高桥墩纵向线刚度的主要措施,亦能保证两边简支梁的竖向静活载挠度满足规范要求;Y型墩的内侧倒角部位为主要的应力集中区,应从外形和钢筋布置两方面来保证应力的合理过渡。In order to solve the problem of bridge span adjustment of a high-speed railway connecting line,the longitudinal Y-shaped bridge pier was designed to avoid important pipelines relocation.By reviewing the literature and using numerical simulation method of the rod element and solid element,the mechanical characteristics of the longitudinal Y-shaped pier including the longitudinal stiffness,the pillar fatigue stress,the stress in the tensile zone at the pier top and the influence on the deflection of the simple beam on both sides are analyzed.The research shows that increasing the longitudinal spacing of the pile foundation to improve the flexural rigidity of the foundation is the main measure to improve the longitudinal stiffness of the pier,and to ensure the live load deflection of the simply supported beams on both sides meets the requirements from codes.Since the inner chamfer parts of Y-shaped pier are main stress concentration area,reasonable transition of the stress should be adopted by arranging pier shape and reinforcement properly.

关 键 词：高速铁路 纵向Y型墩 刚度分析 疲劳控制 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]