摘要
[目的]研究独塔混合梁斜拉桥在成桥状态下受温度影响的力学性能。[方法]以香炉洲大桥为工程背景,建立有限元模型,基于对结构应力、位移和索力的分析,引入不同温度作用为指标,选取体系温差、索梁(塔)温差及梯度温差为控制目标,对桥面混凝土梁段、钢混结合段、钢箱梁梁段及斜拉索进行参数化研究。[结果]钢-混结合梁梁段通过改变梁段的质量和刚度分布,对斜拉桥的应力和竖向位移造成影响。[结论]分析结果表明,在成桥状态下,整体温差和梯度温差对梁段应力、竖向位移影响较小,而整体温差较梯度升温对斜拉索索力变化影响明显;桥梁结构的力学性能受索梁(塔)温差变化影响较大,在斜拉桥结构设计、施工过程监控和成桥状态监测时都应给予充分关注。
[Purposes]In order to study the mechanical properties of hybrid girder cable-stayed bridge with single-tower under the influence of temperature.[Methods]The finite element model is established based on Xiangluzhou Bridge.Based on the analysis of structural stress,displacement and cable force,different temperature effects are introduced as indicators,and the system temperature difference,cable-girder(tower)temperature difference and gradient temperature difference are selected as control objec-tives.Therefore the parametric study of concrete beam section,steel-concrete composite section,steel box girder section and stay cable is carried out.[Findings]Steel-mixed girder segments affect the stresses and vertical displacements of cable-stayed bridges by changing the mass and stiffness distribu-tion of the girder segments.[Conclusions]The analysis results show that in the finished dead state,the overall temperature difference and gradient temperature difference have little effect on the stress and verti-cal displacement of the beam section,while the overall temperature difference has a more obvious effect on the cable force than the gradient temperature rise.The mechanical properties of the bridge structure are greatly affected by the temperature difference of the cable beam(tower).Full attention should be paid to the structural design,construction process monitoring and bridge state monitoring of the cable-stayed bridge.
作者
刘亮
余洋
LIU Liang;YU Yang(School of Physics,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《河南科技》
2024年第16期51-57,共7页
Henan Science and Technology
关键词
斜拉桥
温度效应
成桥状态
力学性能
有限元分析
cable-stayed bridge
temperature effect
finished dead state
mechanical properties
finite el-ement analysis
