基于行人流仿真模型的人群荷载研究

发布时间：2018-06-23 22:37

本文选题：元胞自动机 + 行人流　；参考：《昆明理工大学》2014年硕士论文

【摘要】：人群动荷载是大跨度人行桥、大跨度楼板及大型建筑物的连廊与过道等结构振动的主要原因。目前,单人行人荷载的研究已经相当成熟,众多学者对行人动荷载进行了大量的测试并在此基础上构建了多种步行力荷载模型。对于人群研究,由于存在行人与行人之间的相互作用以及行人与结构之间的相互影响问题,一直都是研究的难点和重点。到目前为止,建立的人群荷载模型还比较少。因此,本文利用行人流仿真模拟结合单人动荷载模型,在考虑了行人之间、行人与结构之间的相互作用的基础上,对六种不同行人流比例关系在不同人群密度下,结构所承受的竖向动荷载和横向动荷载进行分析研究。主要的研究方法和成果如下： 1)建立了基于元胞自动机的行人流动态仿真模型,模型在充分考虑行人微观特征的基础上,以对向行人流为仿真对象,分析研究了行人流速度-密度、流量-密度的曲线关系,并与其他研究者的视频观测结果进行了对比分析,证明了仿真模型在仿真行人流行为特征方面具有一定可靠性。并分析研究了对行人流仿真模型中,多种不同移动方式、不同移动轨迹行人分别占行人总数的比例。 2)基于仿真模型中行人的不同移动方式,结合单人动荷载模型,研究了作用于结构上人群竖向、横向动荷载。单人动荷载模型是在充分考虑了行人步行参数统计特征的基础上建立起来的概率性模型。行人在行走过程中,由于受到其他行人和周围环境的影响,行人步频和相位都表现出不同程度的同步现象,因此,对行人步频和相位的同步调概率需要按照不同人群密度分别取值。本论文利用计算机仿真模拟求解人群荷载的方法,为实际工程中结构的人致振动荷载研究提供了一种新的思路,在对人群荷载的基础研究和考虑人群荷载的结构设计方面具有一定的理论和工程意义。本论文属于国家自然科学基金项目(编号：51168021)的组成部分。
[Abstract]:Crowd dynamic load is the main reason of vibration of long span footbridge, long span floor slab and corridor of large building. At present, the research of single pedestrian load has been quite mature. Many scholars have carried out a lot of tests on pedestrian dynamic load and constructed a variety of walking force load models on this basis. Because of the interaction between pedestrian and structure, the study of crowd is always difficult and important. Up to now, few crowd load models have been established. Therefore, based on the simulation of pedestrian flow and the dynamic load model of single person, taking into account the interaction between pedestrian and structure, the paper studies the relationship between six different pedestrian flows under different population density. The vertical dynamic load and transverse dynamic load on the structure are analyzed and studied. The main research methods and results are as follows: 1) the simulation model of pedestrian flow based on cellular automata is established. The relationship between the velocity density and flow density curves of pedestrian flow is analyzed and compared with the video observation results of other researchers. It is proved that the simulation model is reliable in simulating the characteristics of pedestrian flow behavior. The paper also analyzes and studies the proportion of pedestrians with different moving modes and different trajectory in the pedestrian flow simulation model. 2) based on the different moving modes of pedestrians in the simulation model, combined with the single person dynamic load model, The vertical and transverse dynamic loads acting on the structure are studied. The single person dynamic load model is a probabilistic model based on the full consideration of the statistical characteristics of pedestrian walking parameters. In the course of walking, due to the influence of other pedestrians and the surrounding environment, the pedestrian walking frequency and phase show different degrees of synchronization, so, The synchronization probability of pedestrian step frequency and phase should be determined according to different population density. In this paper, the computer simulation method is used to solve the crowd load, which provides a new way of thinking for the study of the human vibration load of the structure in the actual engineering. It has certain theoretical and engineering significance in the basic research of crowd load and the structural design considering crowd load. This thesis belongs to the project of National Natural Science Foundation (No.: 51168021).
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU312.1

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