摘要
为研究正交异性钢桥面板纵肋对接焊缝的疲劳敏感区域,确定合理的构造参数,设计制作2个带纵肋对接焊缝的钢桥面板模型试件进行疲劳试验,采用ANSYS软件建立钢桥面板有限元模型计算纵肋对接焊缝截面的纵向应力,建立纵肋对接焊缝子模型分析焊缝宽度、形状和纵肋厚度对焊缝截面纵向应力的影响。结果表明:2个试件的疲劳裂纹均出现在纵肋对接焊缝外侧圆弧过渡区,然后向纵肋底部和腹板延伸;纵肋对接焊缝截面的纵向应力在底部水平段和圆弧过渡区较大,且在外侧圆弧过渡区存在应力集中,为疲劳敏感区域;减小焊缝宽度、优化焊缝形状、增大纵肋厚度均能减小焊缝截面的纵向应力,提高疲劳性能,其中增加纵肋厚度效果最显著。
To study the fatigue sensitivity areas of the butt weld joints for the longitudinal ribs of orthotropic steel bridge deck and determine the relevant reasonable structural parameters, 2 deck model specimens with the butt weld joints for the longitudinal ribs were designed, fabricated and the fatigue tests were made. The finite element model for the deck was established, using the software ANSYS and the longitudinal stresses in the sections of the weld joints were calculated. The submodel for a butt weld joint was established as well and the influences of the weld joint width and shapes and the longitudinal rib thickness on the longitudinal stresses in the sections of the weld joints were analyzed. The results reveal that the fatigue cracks of the 2 specimens all ini-tially start in the outer round-arc transition areas of the weld joints for the longitudinal ribs and then extend towards the bottom and webs of the ribs. The longitudinal stresses in the sections of the weld joints are great at the bottom horizontal sections and in the round-arc transition areas, the stress concentration exists in the outer round-arc transition areas and the areas are deemed to be the fatigue sensitivity areas. The decrease of the weld joint width, optimization of the weld joint shapes and increase of the longitudinal rib thickness can reduce the longitudinal stresses in the sec-tions of the weld joints and improve their fatigue performance, of which the effect of the increase of the longitudinal rib thickness is most significant.
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第1期48-53,共6页
Bridge Construction
基金
国家自然科学基金项目(51578407)~~
关键词
正交异性钢桥面板
纵肋
焊缝
疲劳性能
疲劳裂纹
应力
模型试验
有限元法
orthotropic steel bridge deck
longitudinal rib
weld joint
fatigue performance
fatigue crack
stress
model test
finite element method
