服役混凝土桥梁实时疲劳状态评估

发布时间：2018-02-20 14:33

本文关键词： 服役桥梁疲劳破坏实时监测状态评估失效概率　出处：《武汉理工大学学报》2014年01期 　论文类型：期刊论文

【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。
[Abstract]:In order to evaluate the fatigue status of reinforced concrete bridges in service, people pay more and more attention to the fatigue status of reinforced concrete bridges due to repeated dynamic loads. A real-time fatigue state evaluation method for bridges in service based on concrete failure criterion in compression zone is proposed. According to the law that the maximum total strain of fatigue failure under repeated cyclic loading is equivalent to the strain corresponding to the maximum stress in the monotone loading softening section, the fatigue failure criterion of concrete in compression zone is defined. With the help of MATLAB programming, the statistics of real-time monitoring data and the acquisition of probability density function of real-time monitoring data are realized. Finally, based on the proposed method, the fatigue state of Gaoligongshan Bridge is evaluated. The fatigue failure probability of a strain is given.
【作者单位】：重庆交通大学土木建筑学院;重庆市建筑科学研究院;
【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
【分类号】：U448.33;U441.4

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