环氧沥青铺装对钢桥面板受力影响试验研究  

EXPERIMENTAL STUDY ON THE EFFECT OF AN EPOXY ASPHALT CONCRETE PAVEMENT ON AN ORTHOTROPIC STEEL DECK

作　　者：王石磊 齐法琳 柯在田 高岩 WANG Shi-lei;QI Fa-lin;KE Zai-tian;GAO Yan(Infrastructure Inspection Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司基础设施检测研究所,北京100081

出　　处：《工程力学》2020年第10期145-154,共10页Engineering Mechanics

摘　　要：某悬索桥钢箱梁采用正交异性钢桥面板,运行数年后钢桥面板构件连接部位出现了4种疲劳裂纹,为考察新换环氧沥青混凝土铺装对疲劳敏感部位受力影响,建立了有限元模型,开展了长达6年的现场试验,试验涵盖原铺装、铺装铲除、新铺装三种状态,测试了疲劳敏感部位的受力及构件变形规律,开展了考虑温度影响的疲劳寿命改善效果分析研究。结果表明:6年试验期内环氧沥青混凝土铺装与钢桥面板组合受力处于稳定状态,在低温环境下,疲劳敏感部位1~4应力改善效果分别为80%、14%、32%、46%;4个疲劳敏感部位应力与温度线性关联,线性速率分别为-4.00、0.64、1.89、1.91;将实测应力统一至年均温度后,新铺装对部位1疲劳寿命相对改善较大,约提高了2.95倍,对部位4疲劳寿命改善次之,约提高1.64倍,对于部位2、3疲劳寿命改善效果不明显,高温环境下部位2、3开裂可能性仍较大。The steel orthotropic deck was used in the steel box girder of a suspension bridge.Four types of fatigue cracks were discovered at some connections of the orthotropic deck during service.Subsequently the pavement on the deck was replaced with epoxy asphalt concrete.To analyze the effect of the new pavement on the fatigue sensitive regions,a finite element model was established and field bridge tests were conducted at three states,namely,original pavement,surfacing,and new pavement.The test lasted for 6 years under the new pavement state.The stress and deformation of the fatigue sensitive regions were measured.The fatigue life improvement was analyzed considering the temperature based on the measured data.The results show that the epoxy asphalt concrete pavement was in a stable working state during the test period,that the stress improvement effects in the fatigue sensitive regions 1 to 4 were 80%,14%,32%,46%in a low temperature environment,respectively.The stresses of the four fatigue sensitive regions were linearly correlated with the temperature,and the linear ratios are−4.00,0.64,1.89,1.91,respectively.After normalizing the measured stress by the average annual temperature,the fatigue life was improved by 2.95 times in region 1,and by 1.64 times in region 4.The fatigue lives in regions 2 and 3 were not improved obviously,and the cracking probabilities of regions 2 and 3 were still high in a high temperature environment.

关 键 词：正交异性钢桥面板 环氧沥青混凝土铺装 试验 温度 疲劳寿命分析 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]