运营状态下悬索桥钢桥面板疲劳效应监测与分析  

MONITORING AND ANALYSIS OF FATIGUE EFFECTS ON STEEL DECK OF A SUSPENSION BRIDGE IN WORKING CONDITIONS

作　　者：宋永生[1] 丁幼亮[1] 王晓晶[2] 李爱群[1] 李万恒[2] 闫昕[2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]交通运输部公路科学研究院,北京100088

出　　处：《工程力学》2013年第11期94-100,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51178100);交通运输部"十二五"重大科技专项项目(2011318223190);江苏省高校"青蓝工程"优秀青年骨干教师资助计划项目(1105000214);江苏省研究生创新计划项目(CXZZ-0162);东南大学优秀博士学位论文基金项目(YBJJ-1122)

摘　　要：基于润扬大桥悬索桥7个月的长期疲劳效应监测结果,建立了铺装层-钢桥面板一体化疲劳分析模型,并研究了两类关键焊接细节的疲劳效应与车流量、环境温度间的相关性关系。结果表明,两类焊接细节的应力循环次数与车流量线性相关而与环境温度无关,等效应力幅与环境温度线性相关而与车流量无关。由疲劳设计指南推荐的疲劳效应计算模型得到的应力循环次数较监测结果偏低,顶板-纵肋焊接细节的等效应力幅与监测结果吻合良好而纵肋对接焊接细节的结果较为保守。上述分析结果为疲劳设计指南的进一步改进和完善提供参考和依据。One integrated fatigue analytical model consisting of asphalt pavement layer and orthotropic steel bridge deck was established based on long-term fatigue effect monitoring results of Runyang Suspension Bridge in seven months. The correlations between fatigue effects of two pivotal welded joints and traffic flow as well as ambient temperature were then investigated respectively. The investigation results show that the number of stress cycles is merely in linear correlation with traffic flow, and is irrelevant with ambient temperature, in addition, the calculated number of stress cycles according to the fatigue computation model recommended by design code is lower than that by monitoring results. The equivalent stress amplitude of deck-rib is coincident with monitoring results while the equivalent stress amplitude of rib-rib welded joint is relatively conservative. The above results are beneficial and referential for further improvement and completion of design code.

关 键 词：疲劳效应 正交异性钢桥面板 沥青铺装层 环境温度 车流量 有限元 结构健康监测 

分 类 号：TU318[建筑科学—结构工程]