湖南大学学报（自然科学版）2016，Vol.43Issue(9)：82-87,6.
基于断裂力学的锚拉板疲劳寿命评估
Assessment of Fatigue Life for Anchor Plates Based on Fracture Mechanics
摘要
Abstract
To investigate the fatigue performance of anchor plates,a composite beam cable-stayed bridge was taken for example in this study.A loading model in the new standard for steel bridge and the rain-flow method were applied to gain fatigue load spectrum,combined with a three dimensional finite ele-ment model to identify the typical structural details and fatigue stress spectrum of anchor plates.Initial surface cracks were imported in the typical details,and stress intensity factors of crack tips were calculat-ed.The stress intensity factor and crack size were regressed by substituting in Paris formula,which were integrated to gain the fatigue life of typical structural details.The assessment of fatigue life for anchor plates based on fracture mechanics was then established.The results show that the fatigue life for anchor plate based on fracture mechanics is over 100 years,satisfying the requirement of design and utilization;the crack is developed very slowly in the early time,but when it reaches 10 millimeters,50% to 80 % of its fatigue life is consumed.Therefore,reinforcement should be timely applied to the anchor plates.关键词
断裂力学/锚拉板/疲劳寿命/应力强度因子/Paris公式Key words
fracture mechanics/anchor plate/fatigue life/stress intensity factor/Paris formula分类
交通工程引用本文复制引用
李立峰,唐武,唐金良..基于断裂力学的锚拉板疲劳寿命评估[J].湖南大学学报（自然科学版）,2016,43(9):82-87,6.基金项目
国家自然科学基金资助项目（51278183），National Natural Science Foundation of China（51278183）；贵州省交通厅科研课题（201412202）；交通运输部建设科技项目“大跨径钢桁加劲梁悬索桥关键技术研究”（2013318798320）；湖南省交通科技项目 （）
