摘要
为确定浇注式沥青铺装施工对钢桁梁正交异性钢桥面板受力状态的影响,以杨泗港长江大桥为背景,采用自主搭建的物联云平台实时监测,并结合节段有限元分析方法,对铺装施工期桥面板温度场特征进行研究。在数值分析的基础上,确定测点位置,实测得到铺装施工期正交异性桥面板横隔板和U肋等的竖、横向温度传递规律及应力分布特性。结果表明:测点处温度达到最大值的时间平均滞后于摊铺时间(时滞)约30 min,温度沿横隔板竖向呈梯度分布,且升温快降温慢;铺装温度影响时长约6 h,铺装温度在横隔板竖向影响范围从其顶部向下约60 cm;沥青温度242℃时,摊铺后的桥面板底面升温最大值为98.1℃(均值约93.3℃),铺装温度影响下的横隔板横桥向拉、压应力分界线距离横隔板顶部约30 cm,应力最大值约113 MPa。
To examine the influence of gussasphalt placement on the load bearing behavior of orthotropic steel deck plates in the steel truss girder,the Yangsigang Changjiang River Bridge is taken as a study case.Data from the real-time cloud-based monitoring system were used and finite element analysis was carried out,to study the characteristics of temperature field in the steel deck during asphalt placement.On the basis of the numerical analysis,the monitoring points were determined.The measured data were used to analyze the vertical and transverse temperature transfer law and stress distribution characteristics of both the diaphragms and U ribs in the orthotropic steel deck during the placement of gussasphalt.The results indicate that peak temperature at the measurement points appeared 30 minutes after the gussaphalt placement(time delay),temperature gradient was observed along the vertical direction of the diaphragm,with the speed of temperature rising faster than falling.The influence of temperature on the gasssphalt placement lasted 6 hours,and the temperature effect extended 60 cm depth along the vertical direction and from the top of the diaphragm.When the temperature of asphalt was 242℃,the maximum temperature rising value in the base surface of the deck plate was 98.1℃(about 93.3℃on average).Due to the influence of the pavement temperature,the separation line between the tensile and compressive stresses in the diaphragm along bridge width was about 30 cm from the top of the diaphragm,with a maximum stress of 113 MPa.
作者
朱世峰
罗国耀
张毅
梁金宝
付琼
ZHU Shi-feng;LUO Guo-yao;ZHANG Yi;LIANG Jin-bao;FU Qiong(CCCC Road & Bridge Special Engineering Co. , Ltd. , Wuhan 430071, China;China Railway Siyuan Survey and Design Group Co. , Ltd. , Wuhan 430063, China;Chongqing Zhixiang Paving Technology Engineering Co. , Ltd. , Chongqing 401336, China)
出处
《桥梁建设》
EI
CSCD
北大核心
2021年第3期77-84,共8页
Bridge Construction
基金
国家重点研发计划项目(2017YFC0806000)
国家自然科学基金项目(51608080)
湖北省技术创新专项项目(2018AAA031)。
关键词
钢桥
钢桁梁
正交异性桥面板
铺装
浇注式沥青
温度分布
实时监测
监测技术
steel bridge
steel truss girder
orthotropic steel deck plate
pavement
gussaphlat
temperature distribution
real-time monitoring
monitoring technique
