摘要
Abstract
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Key words
high speed railway/ tied arch bridge/ design research/ rise-span ratio/ stiffness ratio/ buckling stability/ dynamic characteristics分类
交通工程
