摘要
以水平转体施工的大跨径钢管混凝土劲性骨架拱桥的转体系统为研究对象,根据其构造和受力特点,建立力学模型;通过对力学模型的受力分析,可知转体系统存在两种不同的倾覆模式,即滑动倾覆模式和支点倾覆模式;基于弹性力学半空间体边界作用集中力理论,求解出球铰接触面上的应力分布;经进一步推导得出两种倾覆模式各自的临界力矩表达式,揭示出转体系统倾覆模式与摩擦系数、球铰几何参数的关系.结合成贵铁路西溪河大桥工程实例,对应用摩擦系数、球铰几何参数判别转体系统倾覆模式做了具体分析.
The study is based on the swivel system of horizontal Swivel large span concrete filled steel reinforced tube arch bridge, with consideration of its structure and stress characteristic, and establishes a mechanical model through the analyses of the mechanical models ：there are two overturning models of the swivel system, sliding overturning model and supporting point overturning mode. They are based on the theory of rational mechanics and concentration effect on half-space boundary of elastic mechanics,on the condition that the stress distribution on the contact surface is solved,and a further derivation has been made, so the critical moments expression formula of the two overturning modes have been derived, which have revealed the relationship between the swivel system overturning mode with coefficient of friction and geometrical parameters of spherical hinge. This paper has made a concrete analysis that how to discriminate overturning model of swivel system by friction coefficient and geometrical parameters of spherical hinge with the engineering example of Xi xi River Great Bridge.
作者
李全乐
黄欣
李自林
韦有波
LI Quanle HUANG Xin LI Zilin WEI Youbo(Tianjin Chengjian University, Tianjin 300384, China The 2nd Engineering, Co., Ltd., China Railway No. 18th Construction Bureau Group, Tangshan 063000, China)
出处
《天津城建大学学报》
2017年第2期96-100,共5页
Journal of Tianjin Chengjian University
基金
天津市自然科学基金(13JCYBJC19600)
住建部科学技术项目(2015-k3-021)
关键词
钢管混凝土拱桥
水平转体
倾覆性能
临界力矩
CFST arch bridge
horizontal swivel
overturning performance
critical moment
