摘要
基于连续梁拱组合体系桥各构件的受力特点,采用产生单位变形所需抵抗力的力学概念定义结构刚度和拱梁相对刚度,以在建的国内最大跨径高速铁路连续梁拱桥为工程背景,通过调整拱肋和主梁的截面形式和尺寸,详细分析了不同拱梁竖向刚度比结构的结构性能。研究结果表明:拱肋对主梁中跨受力和变形性能具有良好的辅助作用;随着拱梁竖向刚度比的增大,主梁边跨受力和刚度可能成为控制结构设计的重要因素;拱梁竖向刚度比达到1.0以上时,其对结构性能的影响程度降低。
Based on the performance of structure and components of continuous beam-arch hybrid bridges,structural stiffness and stiffness ratio are redefined by the concept of mechanical concept of resistance to unit deformation.Taking the longest railway continuous beam-arch hybrid bridge as engineering background,properties of structures with different stiffness ratios are analyzed by adjusting the type and size of beam and arch sections.The results show that the arch has an obvious effect on stress and deformation of girder.Stress and stiffness of side span will become the key factors in designing with stiffness ratio increasing.When the vertical stiffness reaches above 1.0,stiffness ratio shows less influence on structure properties.
作者
郝礼增
马坤全
郭玉坤
Hao Lizeng;Ma Kunquan;Guo Yukun(Department of Bridge Engineering,Fongji University,Shanghai 200092,China;Construction Management Office,Shanghai Railway Bureau,Shanghai 200071,China)
出处
《石家庄铁道大学学报（自然科学版）》
2019年第4期8-15,共8页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
关键词
高速铁路
大跨度连续梁拱桥
拱梁竖向刚度比
结构性能
high-speed railway
long-span continuous beam-arch hybrid bridge
arch-beam stiffness ratio
structure property
