[1]黄侨,朱志远,任远,等.基于车辆荷载模型的斜拉索索力随机模拟及疲劳分析[J].长安大学学报(自然科学版),2021,41(2):12-22.
　HUANG Qiao,ZHU Zhi yuan,REN Yuan,et al.Cable force simulation and fatigue analysis for staycable based on traffic load model[J].Journal of Chang’an University (Natural Science Edition),2021,41(2):12-22.
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基于车辆荷载模型的斜拉索索力随机模拟及疲劳分析()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年2期
页码:
12-22
栏目:
桥梁与隧道工程
出版日期:
2021-03-15

文章信息/Info

Title:
Cable force simulation and fatigue analysis for staycable based on traffic load model
作者:
黄侨; 朱志远; 任远; 樊梓元; 章世祥
(1. 东南大学 交通学院，江苏 南京 211189； 2. 华设设计集团股份有限公司，江苏 南京 210014)
Author(s):
HUANG Qiao1;  ZHU Zhiyuan1;  REN Yuan1;  FAN Ziyuan1;  ZHANG Shixiang2
(1. School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China;2. China Design Group Co., Ltd., Nanjing 210014, Jiangsu, China)
关键词:
桥梁工程; 疲劳性能; 荷载流模拟; 车辆荷载模型; 斜拉索; 腐蚀
Keywords:
bridge engineering;  fatigue property;  simulation of traffic load flow;  traffic load model;  stay cable;  corrosion
文献标志码:
A
摘要:
为了满足斜拉索状态评估和养护管理的需求，提出基于车辆荷载模型的斜拉索疲劳寿命分析方法。以桥梁收费站的静态称重数据和桥面监控资料为依据，采用极大似然估计和最大期望（EM）算法，建立了12类车型及车重、轴重、车速等相关参数的车辆荷载统计模型。基于MonteCarlo方法、泊松过程理论和车辆跟驰模型，编写计算程序进行随机车流仿真分析，随机生成车辆荷载的作用位置和大小，并在影响线上加载得到活载索力时程，将其与长期监测系统得到的实测活载索力时程进行对比分析，验证了该模型的有效性。然后，考虑车辆荷载模型的长期趋势，结合腐蚀斜拉索的应力疲劳寿命（SN）曲线和Miner线性累积损伤理论，分别对未腐蚀和腐蚀2种情况的斜拉索长期性能进行了分析与预测。研究结果表明：各车型质量统计数据呈现多峰分布特征，建立随机车辆荷载模型时，宜采用混合分布模型，并考虑车重与轴重之间的相关性；建立的随机车流仿真模型计算得到的活载索力与实测活载索力具有较高的相似度，相对熵（KL）散度在0.1左右，证明该模型能较为准确地模拟实际的交通荷载流，可用于进一步的分析和预测；腐蚀是影响斜拉索疲劳寿命的重要因素，根据试验桥的分析结果，未腐蚀的斜拉索基本不存在疲劳问题，但腐蚀使斜拉索的疲劳寿命迅速降低，甚至会发生早期断裂。
Abstract:
In order to meet the demands of assessment and maintenance for stay cables, the fatigue analysis of stay cables based on traffic load model was proposed. According to the weighing data from toll station and monitoring video of bridge, the maximum likelihood estimation and EM algorithm were used to establish vehicle load statistical models with 12 types of vehicle and other parameters, such as gross weight, wheel weigh, and velocity. A program was developed based on the MonteCarlo method, the Poisson process theory and the vehicle following method. This program was used to randomly generate the position and magnitude of the traffic load. The cable force time history was obtained by conducting the established traffic model with influence line. A comparison with the data that separated from monitoring system measurements was also adopted to verify its effectiveness. Then, considering the longterm trend of the traffic load model, the SN curve of corroded stay cables and Miners linear damage accumulating theory were used to analyze and predict the longterm performance of the undamaged and corroded stay cables. The results show that the weight of vehicles are subject to the multipeak distributions. When establishing the traffic load model, the mixed distribution model and the correlation between the vehicle weight and the wheel weight should be considered. The cable force calculated by the traffic load model was line to the measured cable force while the KullbackLeibler (KL) divergence is about 0.1, which proves the established model can simulate the actual traffic flow accurately, thus can be used for further analysis and prediction. Corrosion is an important factor that influences the fatigue life of stay cables. According to the analysis results of the background bridge, fatigue damage will not occur in the undamaged stay cables. However, corrosion significantly decreases the fatigue life of stay cables, and even causes early fracture. 6 tabs, 9 figs, 26 refs.

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更新日期/Last Update: 2021-04-02