CAJ | 학술논문

为验证有效缺口应力法在正交异性钢桥面板疲劳评价中的适用性,开展了横隔板弧形切口2种不同过渡形式的局部应力研究。采用 Ansys 分别计算 U 肋与横隔板连接处焊趾和焊根处的有效缺口应力,并加以比较,表明焊趾处更易萌生裂纹。采用 S-N 曲线评估其疲劳寿命,表明有效缺口应力法可以应用于正交异性桥面板的疲劳评价。有限元分析假定缺口的真实半径为0,这可能导致试验结果的保守性。基于不同 U 肋厚度的比较,发现 U 肋厚度的增加将导致 U 肋与横隔板端焊缝处更易产生疲劳裂纹。相关研究结果可为正交异性钢桥面板的设计和疲劳评价提供参考。
위험증유효결구응역법재정교이성강교면판피로평개중적괄용성,개전료횡격판호형절구2충불동과도형식적국부응력연구。채용 Ansys 분별계산 U 륵여횡격판련접처한지화한근처적유효결구응력,병가이비교,표명한지처경역맹생렬문。채용 S-N 곡선평고기피로수명,표명유효결구응역법가이응용우정교이성교면판적피로평개。유한원분석가정결구적진실반경위0,저가능도치시험결과적보수성。기우불동 U 륵후도적비교,발현 U 륵후도적증가장도치 U 륵여횡격판단한봉처경역산생피로렬문。상관연구결과가위정교이성강교면판적설계화피로평개제공삼고。
In order to confirm that the effective notch stress method is applicable to the fatigue assess-ment of orthotropic steel bridge deck,the local stress characteristics of two different transition forms in the arc notch details of diaphragm was studied.The effective notch stress in the weld toe and the weld root of the rib-to-diaphragm was computed separately and compared.The result has shown that the crack is easier to generate in the weld toe.The experiment result was assessed by S-N curve,and the result has shown that the effective notch stress method is suitable for assessing orthotropic steel bridge deck.The notch radius was assumed to be zero and it would result in conservative results.Based on the comparison of different rib thickness,it is found that the crack initiation in the rib-to-diaphragm seems to be easier to generate with the increase of rib thickness.This study can provide important information for design of or-thotropic steel bridge deck,as well as for the evaluation of the fatigue performance of orthotropic steel bridge deck.