摘要
为了给公路正交异性钢桥面板的设计提供建议,基于热点应力法,通过建立精细化有限元模型,分析了焊缝细节的疲劳应力幅,计算结果表明U肋与横梁切口处、顶板与U肋焊缝处为疲劳开裂的薄弱环节。探讨了这两类细节易于开裂的内在原因,并通过参数对比发现:增大截面尺寸和顶板厚度、增设U肋内隔板有利于缓解切口处U肋疲劳应力;而横梁间距由3 m增大到4.5 m后,切口处沿肋壁竖向的疲劳应力幅增幅为109%;增加顶板厚度和减少U肋开口宽度能改善顶板与U肋焊接处疲劳应力幅。
In order to provide a reference for design of orthotropic steel deck in highway bridge,based on hotspot stress approach,the fatigue stress range of weld detail is analyzed by using the built refined finite element models. The result indicates that both U-rib at the floor beam web cut-out and deck-to-U-rib weld are more prone to fatigue failure. The internal causes of the above 2 kinds of fatigue details are explored. It is found out through comparing the results of different parameters that（ 1） enlarge U-rib＇s dimensions,increase deck thickness,and place diaphragm in U-rib can relieve the fatigue stress of U-rib at the cut-out（ 2） when the distance between 2 floor-beams increased from 3 m to 4. 5 m,the vertical fatigue stress range of U-rib at FB web cut-out increased 109%;（ 3） increase deck thickness and decrease open mouth＇s width of U-rib also can improve fatigue stress range of deck-to-U-rib weld.
出处
《公路交通科技》
CAS
CSCD
北大核心
2016年第1期76-81,共6页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
疲劳
热点应力法
正交异性钢桥面板
焊缝细节
bridge engineering
fatigue
hot-spot stress approach
orthotropic steel deck
weld detail
