摘要
为研究混合-组合梁斜拉桥结构支撑体系的适用性,以澜沧江大桥为工程背景,建立了漂浮、半漂浮和刚构3种支撑体系的有限元模型,对比分析了不同结构支撑体系下结构的静动力特性。结果表明,半漂浮体系结构的梁端和塔顶位移与刚构体系相差不大,但主梁内力明显小于刚构体系;除塔底弯矩略大于漂浮体系外,半漂浮体系结构的静力学性能均优于漂浮体系;不同支撑体系对结构的动力特性影响较小,三者之间的差异可以忽略不计。综合考虑3种支撑体系对桥梁静动力性能的影响可知,依托工程采用半漂浮体系设计更为合理。
In order to study the applicability of structural support system of hybrid-composite girder cable-stayed bridge, the finite element models of floating, semi-floating and rigid frame support systems are established according to the Yongjiang Bridge, and the static and dynamic characteristics of structures under different structural support systems is compared. The results show that the displacement of beam-end and top of the semi-floating structure is not different from that of the rigid frame system, but the main beam internal force is much smaller than that of the rigid frame system. The performance of the semi-floating system is superior to that of the floating system except that the bending moment at the tower bottom is slightly larger than that of the floating system. The three structural systems have little effect on the structural dynamic characteristics and can be considered equally. Considering the impact of three structural systems on the static and dynamic forces of the bridge, the semi-floating system design is more reasonable.
作者
杨子先
余永亮
张建东
刘朵
王贤强
YANG Zixian;YU Yongliang;ZHANG Jiandong;LIU Duo;WANG Xianqiang(Civil Engineering, Nanjing Tech University, Nanjing 211800, China;Construction Headquarters of Lancang River Bridge, Jinghong 666100, China;JSTI GROUP, Nanjing 211112, China)
出处
《交通科技》
2019年第5期37-41,共5页
Transportation Science & Technology
基金
云南省交通运输科技计划项目（2017-26）
江苏省博士后科研资助计划项目（2018-286）资助
关键词
斜拉桥
混合-组合梁
有限元分析
支撑体系
影响分析
cable-stayed bridge
mixed-composite beam
finite element analysis
support system
impact analysis
