摘要
因动载反复作用,钢筋混凝土桥梁疲劳状况越来越引起人们的高度重视,为了评估服役中钢筋混凝土桥梁的疲劳状态,提出了基于受压区混凝土破坏准则的服役桥梁实时疲劳状态评估方法。首先,根据反复循环加载疲劳破坏时的最大总应变与单调加载软化段中最大应力对应的应变相当这一规律,明确了受压区混凝土疲劳破坏准则;其次,在制定阈值的基础上,借助MATLAB编程,实现了实时监测数据的统计和实时监测数据概率密度函数的获取;最后,基于提出的方法,对高黎贡山大桥进行了疲劳状态评估,针对966180测点,给出了产生某一应变的疲劳失效概率。
Under repeated dynamic loads, fatigue conditions of the reinforced concrete bridge arouse more and more people＇s attention recently. The real-time fatigue state assessment method of existing bridge was proposed, based on the failure criterion of concrete in compression zone. Firstly, according to the rule that the fatigue damage maximum total strain under repeated cyclic loads equals to the strain corresponding to the softening period maximum stress under monotonic loads, the failure criterion of concrete in the compression zone was clearly illustrated. Secondly, with the aid of the MATLAB programming and based on the setting threshold, the statistics and the acquisition of probability density function of real-time monitoring data were realized. At last, based on the method proposed, the fatigue state of Bridge Gaoligong mount was evaluated. According to 966180 measuring points, the fatigue failure probability was put forward when a particular strain is produced.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2014年第1期108-111,134,共5页
Journal of Wuhan University of Technology
基金
教育部博士点学科专项基金(20115522110001)
重庆市百名高端人才基金
关键词
服役桥梁
疲劳破坏
实时监测
状态评估
失效概率
existing bridge
fatigue failure
real-time monitoring
state assessment
failure probability
