基于WIM数据的上海长江隧桥锚固结构寿命评估

发布时间：2018-01-07 13:04

本文关键词：基于WIM数据的上海长江隧桥锚固结构寿命评估　出处：《南京航空航天大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文结合上海长江隧桥的动态称重系统（WIM）所采集的车辆信息数据，以索梁和索塔锚固区的钢锚箱作为研究对象，采用名义应力法评估其疲劳寿命，并对结构所能承受最大疲劳载荷时的车流量做了预测。具体来讲，在此过程中所做工作包括如下几方面：（1）对斜拉桥以及锚固结构做了系统的介绍，并对钢桥疲劳问题所研究的内容、未来的发展方向做了详细阐述。另外，介绍了名义应力法、断裂力学方法和疲劳可靠性方法三种结构疲劳寿命评估的方法，对两种累积损伤理论进行比较分析，结合钢桥疲劳问题的分析方法确定了本文所研究钢锚箱的疲劳寿命评估的方法和主要步骤。（2）整理WIM采集的三个具有代表性月份的车辆轴重及轴距信息，根据汽车相关手册和车辆分类标准对通过大桥的所有车辆进行分类，，根据等效轴重和等效轴距公式对每一类车辆载荷等效处理得到整桥模型的载荷，对整桥模型分步加载之后提取本文所分析的钢锚箱所对应的拉索的索力变化历程。（3）分别建立索梁和索塔锚固区钢锚箱的ANSYS模型，加载索力的设计值和多倍值对其进行静力计算分析。根据钢锚箱的整体应力云图和单独板件的应力云图确定应力集中部位和易发生疲劳破坏的位置。（4）分别计算不同轴型的汽车加载时钢锚箱的应力变化历程，采用雨流计数法建立疲劳细节的应力谱，参考BS5400确定疲劳细节的S-N曲线，结合线性累积损伤准则公式计算钢锚箱的疲劳寿命，并对该结果做出分析和说明。根据计算所用车流量和疲劳寿命预测值估算钢锚箱发生破坏前大桥可以通车的车流总量。
[Abstract]:Based on the vehicle information data collected by the dynamic weighing system of Shanghai Yangtze River Tunnel, this paper takes the steel anchor box in the cable beam and cable tower Anchorage area as the research object, and uses the nominal stress method to evaluate its fatigue life. The traffic flow is predicted when the structure can withstand the maximum fatigue load. Specifically, the work done in this process includes the following aspects: 1) the cable-stayed bridge and anchoring structure are introduced systematically, and the research contents and future development direction of steel bridge fatigue are described in detail. In addition, nominal stress method is introduced. Fracture mechanics method and fatigue reliability method are used to evaluate the fatigue life of structures. The two cumulative damage theories are compared and analyzed. Combined with the analysis method of steel bridge fatigue problem, the method and main steps of fatigue life evaluation of steel anchor box studied in this paper are determined. (2) sorting out the information of vehicle axle load and wheelbase collected by WIM in three representative months, and classifying all vehicles passing through the bridge according to the vehicle related manual and vehicle classification standard. According to the equivalent axle load and the equivalent wheelbase formula, the load of the whole bridge model is obtained by the equivalent treatment of each kind of vehicle load. After the whole bridge model is loaded step by step, the cable force change history of the steel anchor box is extracted. (3) the ANSYS model of steel anchor box in cable beam and cable tower Anchorage zone is established respectively. The static calculation and analysis of the design value and multi-fold value of the loading cable force are carried out. According to the integral stress cloud diagram of the steel anchor box and the stress cloud diagram of the individual plate, the stress concentration position and the position where fatigue failure is easy to occur are determined. (4) the stress variation history of steel anchor box under different axle loading is calculated, the stress spectrum of fatigue details is established by rain flow counting method, and the S-N curve of fatigue detail is determined by referring to BS5400. The fatigue life of steel anchor box is calculated with linear cumulative damage criterion formula. According to the calculated vehicle flow and fatigue life prediction value, the total traffic volume of the bridge can be opened to traffic before the failure of the steel anchor box.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U441.4

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