摘要
为研究新型索辅梁桥在设计时如何使用恰当的缆索承载比、何种缆索类型及布置方式来辅助梁体受力,以索辅梁拱塔斜拉桥—眉山岷江大桥为例,采用数值分析法及有限元计算对拱塔及辅塔的受力进行影响分析。主要结论为:缆索对跨度的提升作用随着其承载比的增大而增加,且当混凝土梁体采用斜拉索辅助时,对跨度的提升作用更为有效;当双肢钢拱塔间夹角约44°时,可运用“3段平衡式拉索”实现梁体和钢拱塔受力最佳的设计目的;辅塔设置斜拉索对边跨梁体受力改善明显;研究得出索辅梁跨度经验公式L辅=K 1/ηL梁可用于指导索辅梁桥设计。
To study how to adopt proper cable bearing ratio and proper cable type and arrangement mode to support the stress on the beam body in the design of new bridge-cable auxiliary beam bridge,with auxiliary arch tower cable-stayed Minjiang Bridge in Meishan as an example,the numerical analysis and finite element calculation are used in targeted research,and the influence on the stress of arch tower and auxiliary tower is analyzed.It is concluded that the lifting effect of the cable on the span increases with the increase of its bearing ratio;it is more effective to lift the span when the concrete beam is assisted by stay cables;when the angle between the two-limb steel arch towers is about 44°,"three segmented balanced cables"can be used to achieve the optimal design of the beam body and the steel arch tower under the stress;the stress of the beam with opposite side of the cable set in the auxiliary tower is obviously improved;and the empirical formula for the span of cable auxiliary beam is obtained L Auxiliary=K 1/ηL beam which can be used for guiding the design of cable auxiliary beam bridge.
作者
马振栋
陈家勇
赖亚平
MA Zhendong;CHEN Jiayong;LAI Yaping(T.Y.Lin International Engineering Consulting(China)Co.,Ltd.,Chongqing 401121,China)
出处
《公路交通技术》
2021年第2期71-77,共7页
Technology of Highway and Transport
基金
重庆市院士牵头科技创新引导专项项目(CSTC2017zdcy-yszxX0003)。
关键词
索辅梁桥
缆索承载比
拱塔斜拉桥
3段平衡式拉索
同步对称竖转
cable auxiliary bridge
cable bearing ratio
arch tower cable-stayed bridge
three segmented balanced cables
synchronous symmetric vertical rotation
