基于热点应力法的正交异性钢箱梁疲劳评估

发布时间：2018-02-21 23:47

本文关键词： 热点应力法疲劳评估钢箱梁应力谱有限元分析健康监测　出处：《合肥工业大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

【摘要】：文章运用健康监测系统实测应力数据,采用热点应力法对正交异性钢箱梁进行疲劳评估;并建立了局部有限元模型,计算了疲劳危险焊缝连接部位的应力集中系数。通过实桥健康监测系统采集钢箱梁危险部位的应力时程,运用求出的应力集中系数计算相应的热点应力时程,采用雨流计数法对热点应力进行统计分析得出结构每天的日应力谱,将多天的日应力谱进行统计平均定义为结构标准日应力谱。基于线性累积损伤准则和热点应力疲劳强度曲线对钢箱梁进行疲劳寿命评估,将提出的方法应用于安装了健康监测系统的实桥分析。结果表明,在钢箱梁U肋和横隔板连接的部位会产生疲劳破坏,因此应加强该部位的维修和养护。
[Abstract]:In this paper, the stress data measured by health monitoring system are used to evaluate the fatigue of orthotropic steel box girder, and the local finite element model is established. The stress concentration factor of the joint of the fatigue dangerous weld is calculated. The stress time history of the dangerous part of the steel box girder is collected by the real bridge health monitoring system, and the corresponding hot stress time history is calculated by using the calculated stress concentration factor. The daily stress spectrum of the structure is obtained by statistical analysis of hot spot stress by rain flow counting method. The daily stress spectrum of many days is defined as the standard daily stress spectrum of the structure. The fatigue life of steel box girder is evaluated on the basis of linear cumulative damage criterion and hot stress fatigue strength curve. The proposed method is applied to the analysis of the actual bridge installed with the health monitoring system. The results show that fatigue damage will occur in the part of the steel box girder where the U-rib and the transverse partition are connected, so the maintenance and maintenance of this part should be strengthened.
【作者单位】：华中科技大学土木工程博士后流动站;中铁大桥局集团武汉桥梁科学研究院有限公司;
【基金】：国家杰出青年科学研究基金资助项目(50925828)
【分类号】：U448.213;U441.4

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