基于缺口应力的波形钢腹板结构疲劳分析研究

Study on fatigue analysis of beam with corrugated steel webs using notch stress method

基于现行规范对波形钢腹板结构的疲劳问题没有明确的规定,为了研究这种结构的疲劳设计及评估方法,对试验模型梁进行等幅疲劳荷载试验,得到波形钢腹板梁典型疲劳细节和基础疲劳数据。应用有限元软件建模,采用子模型法计算细节处缺口应力,并采用缺口应力法对试验梁的疲劳性能进行评估。研究结果表明:缺口应力法评估波形钢腹板疲劳性能是可行的。波形钢腹板典型疲劳细节的缺口应力集中系数受腹板转角半径和波折角度影响较大,随腹板转角半径的增大而减小,随腹板波折角度的增大而增大。

There are no standards to guide the design of fillet weld’s fatigue behavior of beam with corrugated steel webs.In order to study its fatigue design and assessment methods,fatigue test was performed,and the typical fatigue detail and basic fatigue data were obtained from the test.FEM beams were established and the sub model method was adopted to calculate the stress of welding detail.The notch stress concentration factor of model beams was calculated using the method recommend by the IIW.The fatigue performance of test beams was assessed by the notch stress method,and it could be concluded that the notch stress method was a feasible method in fatigue performance assessing of the corrugated steel web beam.The parameter analysis shows that:the largest notch stress and its concentration factor will be greatly influenced by corner radius and corrugation angle and they will decrease with the increment of corner radius and increase with the increment of corrugation angle.