新型元胞自动机交通流荷载模型及其应用
发布时间：2018-10-11 12:44
【摘要】：探索符合实际交通现状的汽车荷载模型,对桥梁设计,可靠性评估和维修加固决策等均具有十分重要的现实意义。随着大跨径桥梁的不断修建,其汽车荷载不再适合用传统的静态车队模型去模拟。工程界对动态车流荷载模型的需求越来越迫切。现有的元胞自动机交通流模型(CA)能出色地完成对动态车流的模拟。如何将传统的CA模型运用到车流荷载的模拟中是本文研究的主要内容。首先,在前人研究成果的基础上,本文得出了将汽车荷载融入到CA模型中是可行的这一结论。然后,简述了已有成果的待改进之处,指出要在几个关键的问题上有所突破,才能彻底将汽车荷载和CA模型结合起来。为了达到这个目的,本文对传统CA模型的元胞长度,边界条件进行了修改,并重新推导了车辆的状态更新公式。尤其提出了一种新的荷载加载方式,使得利用CA模型进行影响线加载成为了可能,并且这种加载能在任意精度上进行控制。经过一系列改造后,本文对改造后的新程序进行了试验验证。验证结果表明,新程序能准确模拟交通状况和汽车荷载。最后,将本程序分别应用到了简支梁桥和斜拉桥中。应用到简支梁桥中,既计算了几座标准跨径简支梁桥在1个月实测车流荷载作用下的响应,并与JTG D60-2004规范和JTG B01-2014规范中公路Ⅰ级标准值产生的效应做了对比;又通过与静态荷载结果对比验证了程序的正确性。在应用到斜拉桥时,对比分析了索力和关键截面处的效应在随机车流荷载和公路Ⅰ级荷载下的区别,为斜拉桥的优化设计提供了一些参考。
[Abstract]:It is very important for bridge design, reliability evaluation and maintenance and reinforcement decision to explore the vehicle load model which accords with the actual traffic situation. With the continuous construction of long span bridges, the vehicle loads are no longer suitable to be simulated by the traditional static motorcade model. The demand of dynamic vehicle load model is more and more urgent in engineering field. The existing Cellular Automata (CA) traffic flow model (CA) can do well in simulating the dynamic traffic flow. How to apply the traditional CA model to the simulation of vehicle flow load is the main content of this paper. Firstly, on the basis of the previous research results, this paper draws the conclusion that it is feasible to incorporate the vehicle load into the CA model. Then, the improvement of the existing achievements is briefly introduced, and it is pointed out that some breakthroughs should be made on several key issues before the vehicle load and CA model can be thoroughly combined. In order to achieve this goal, the cell length and boundary conditions of the traditional CA model are modified, and the vehicle state update formula is rededuced. In particular, a new loading mode is proposed, which makes it possible to use the CA model to load the influence line, and the load can be controlled with arbitrary precision. After a series of revamping, the new program is tested and verified in this paper. The results show that the new program can accurately simulate traffic conditions and vehicle loads. Finally, the program is applied to simply supported beam bridge and cable-stayed bridge respectively. Applied to simply supported beam bridge, the response of several standard span simple supported beam bridges under one month traffic load is calculated, and compared with the effect of highway grade I standard value in JTG D60-2004 code and JTG B01-2014 code. The correctness of the program is verified by comparing with the static load results. When applied to cable-stayed bridge, the difference between cable force and effect at key section under random traffic load and highway first class load is analyzed, which provides some references for the optimum design of cable-stayed bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2
本文编号：2264239
[Abstract]:It is very important for bridge design, reliability evaluation and maintenance and reinforcement decision to explore the vehicle load model which accords with the actual traffic situation. With the continuous construction of long span bridges, the vehicle loads are no longer suitable to be simulated by the traditional static motorcade model. The demand of dynamic vehicle load model is more and more urgent in engineering field. The existing Cellular Automata (CA) traffic flow model (CA) can do well in simulating the dynamic traffic flow. How to apply the traditional CA model to the simulation of vehicle flow load is the main content of this paper. Firstly, on the basis of the previous research results, this paper draws the conclusion that it is feasible to incorporate the vehicle load into the CA model. Then, the improvement of the existing achievements is briefly introduced, and it is pointed out that some breakthroughs should be made on several key issues before the vehicle load and CA model can be thoroughly combined. In order to achieve this goal, the cell length and boundary conditions of the traditional CA model are modified, and the vehicle state update formula is rededuced. In particular, a new loading mode is proposed, which makes it possible to use the CA model to load the influence line, and the load can be controlled with arbitrary precision. After a series of revamping, the new program is tested and verified in this paper. The results show that the new program can accurately simulate traffic conditions and vehicle loads. Finally, the program is applied to simply supported beam bridge and cable-stayed bridge respectively. Applied to simply supported beam bridge, the response of several standard span simple supported beam bridges under one month traffic load is calculated, and compared with the effect of highway grade I standard value in JTG D60-2004 code and JTG B01-2014 code. The correctness of the program is verified by comparing with the static load results. When applied to cable-stayed bridge, the difference between cable force and effect at key section under random traffic load and highway first class load is analyzed, which provides some references for the optimum design of cable-stayed bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2
【参考文献】
相关期刊论文 前1条
1 陈向东;金先龙;张晓云;李政;;基于元胞自动机的路面车流荷载[J];上海交通大学学报;2008年06期
，本文编号：2264239
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