铁路三拱肋简支系杆拱桥设计参数研究  

Research on Design Parameters of Simply Supported Tied-Arch Railway Bridge with Three-arch Ribs

作　　者：李方柯 苏国明 LI Fang-ke;SU Guo-ming(China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道标准设计》2018年第6期61-65,共5页Railway Standard Design

摘　　要：为了解三片拱肋设计对铁路简支系杆拱桥受力性能的影响,结合某铁路1-80 m三拱肋简支系杆拱桥的结构选型和设计,建立有限元模型,对边中拱梁截面尺寸、拱梁刚度比、合理拱形、横撑布置、吊杆力等主要设计参数进行研究,提出各设计参数的取值建议。研究结果显示:边中拱、梁宜采用相同的截面尺寸;拱梁刚度比宜取1/12~1/4;合理拱形的矢跨比宜采用1/5~1/6,拱轴线宜采用1.8~2次抛物线;加强跨中和1/4跨位置的横撑布置有利于提高结构的整体稳定性;中、边吊杆的成桥索力比值为1.15左右较为合理。For better understanding of the influence of the three-arch ribs on the mechanical performance of simply supported ties-arch railway bridge,this paper analyzes the main design parameters such as section size of mid-side arches and tie beams,stiffness ratio of the arches and tie beams,reasonable arch shape,brace allocation,tensile force of rod by Finite Element Method with reference to the structural selection and design of a 80 m railway bridge of the same structural system,and suggestions for design parameters values are presented. The results show that the middle arch and tie beam should adopt the same section size; the appropriate value of stiffness ratio of arches to tie beams is 1/12 to 1/4; the reasonable rise-span ratio of arch should be 1/5 to 1/6,and the arch axis should be 1. 8 to 2 times of parabola.; the overall structural stability can be benefitted from strengthening braces of mid span and 1/4 span,and the ratio of the tensile force between the middle and the side rods should be reasonably about 1. 15.

关 键 词：铁路桥梁 系杆拱 三拱肋 刚度比 矢跨比 拱轴线 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.225[交通运输工程—道路与铁道工程]