高速铁路大跨度简支系杆拱桥设计研究  

Design Research on Simply Supported Tied-Arch Bridge with Long-Span in High Speed Railway

作　　者：沙培洲[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道标准设计》2012年第7期60-64,共5页Railway Standard Design

摘　　要：针对高速铁路128 m简支系杆拱桥的设计,采用BSAS程序和MIDAS程序建模计算分析,重点对矢跨比、梁拱刚度比、吊杆初张力、屈曲稳定和动力特性进行分析研究。分析表明:矢跨比取1/5时,拱肋和系梁设计时构造更易处理,更为安全、经济。拱肋与系梁的刚度比对结构竖向刚度影响最大,选取合适的刚度比便能方便快捷地确定、优化拱肋截面尺寸。结构失稳主要是拱肋的面外屈曲,设计中应加强拱肋间的横向连接。增加吊杆刚度,加强拱肋、系梁及吊杆协同工作的能力,将有助于提高结构的整体刚度。The article,aiming at the design of 128-m simply supported tied-arch bridge in high speed railway,using BSAS program and MIDAS program for modeling calculation and analysis,analyzes and researches emphatically the rise-span ratio,rigidity ratio of beam arch,initial tension of suspender,buckling stability and the dynamic characteristics.The analysis results show that: when the rise-span ratio is 1/5,the structure designs for the arch rib and tie beam are easier to be dealt with,more secure and economic.It is the rigidity ratio between the arch rib and the tie beam that creates the greatest influence on the vertical rigidity of the structure.If the rigidity ratio is selected appropriately,then the arch rib's section size will be quickly determined and optimized.Structure instability is mainly because of the out-of-plane buckling of arch rib,so the transverse connection should be strengthened in design.The overall rigidity of the structure can be improved by means of increasing the suspender rigidity and enhancing the ability of cooperative work among the arch rib,tie beam and the suspender.

关 键 词：高速铁路 系杆拱桥 设计研究 矢跨比 刚度比 屈曲稳定 动力特性 

分 类 号：U44[建筑科学—桥梁与隧道工程]