带过焊孔焊接细节疲劳性能优化及试验研究

发布时间：2018-06-23 07:30

本文选题：钢桁梁桥 + 焊接　；参考：《桥梁建设》2017年02期

【摘要】：为了提高带过焊孔焊接细节的疲劳寿命,以某钢桁梁桥为背景,针对其翼缘板和斜腹杆的焊接构造,通过在过焊孔处填半圆弧板和焊缝错开的形式对其疲劳性能进行优化,制作带过焊孔焊接细节和优化模型的试件,进行疲劳试验测试其疲劳寿命,并结合有限元分析对比各模型的疲劳性能,验证优化措施对疲劳性能的改善效果。结果表明:在过焊孔处填半圆弧板可有效改善带过焊孔焊接细节的局部应力集中现象,提高其疲劳寿命,在高应力幅作用时效果更加显著;对接焊缝错开可显著提高带过焊孔焊接细节的疲劳寿命,其改善效果优于在过焊孔处填半圆弧板,在实际工程结构中推荐优先采用。
[Abstract]:In order to improve the fatigue life of welding details with overwelded holes, the fatigue performance of a steel truss bridge was optimized by filling semi-circular plate and staggered weld seam in the form of overwelding hole, aiming at the welding structure of flange plate and inclined web bar. The fatigue life of the specimen with overwelded hole welding details and optimization model was tested by fatigue test. The fatigue performance of each model was compared with finite element analysis to verify the improvement effect of optimization measures on fatigue performance. The results show that filling semi-circular arc plate in overwelded hole can effectively improve the local stress concentration phenomenon with welding details of overwelded hole and increase its fatigue life, and the effect is more obvious when the stress amplitude is high. Staggered butt welds can significantly improve the fatigue life of welding details with overwelded holes, and the improvement effect is better than that of filling semi-circular arc plates in over-welded holes, which is preferred in practical engineering structures.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51308467、51378431) 中国铁路总公司科技研究开发计划项目(2013G001-A-2)~~
【分类号】：U441.4

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