大跨楼盖结构人群荷载模拟及振动响应分析

发布时间：2018-06-12 02:30

本文选题：大跨楼盖结构 + 步行特征参数　；参考：《东南大学》2015年硕士论文

【摘要】：随着大跨楼盖结构建设量的日益增多,超过人体舒适度限值要求的工程案例时有发生,此类结构越来越引起人们的关注。目前对于这类大跨楼盖结构的振动响应规律研究工作开展较少,工程设计实践尚缺乏理论的指导,特别是在人群荷载激励下的振动响应和控制研究还尚未完善,主要集中表现在对人群步行规律的不确定性上,因此建立合理的人行荷载荷载模型对于大跨楼盖结构的合理设计与正常使用具有重要的理论意义和工程实践意义。本文以高铁站房大跨楼盖结构人群为主要研究对象,主要研究工作和成果如下：1,人群步行特征参数的统计分析。本文利用MATLAB视频分析程序对南京南站、上海虹桥站、北京南站、武汉站和广州南站候车大厅内的人群步行特征参数进行了统计分析,得到了这五大高铁站房人群步行特征参数的分布规律；统计得出总体人群自由行走时步频服从f～N(1.8811,0.17662)的正态分布,相位角服从φ～U(0,2π)之间的均匀分布：同时对影响人群行走的因素进行了统计分析,利用随机概率分布的方法统计得出进站大厅人群步行同步调概率服p～N(0.2516,0.06722)的正态分布,候车大厅人群步行同步调概率服从p～N(0.1880,0.05712)的正态分布；最后利用不同人群密度之间的统计参数,拟合得到了人群步行特征参数与人群密度之间的关系。2.随机人群荷载的模拟。基于统计得到的步行特征参数,参考IABSE建议的单人步行荷载模型,利用MATLAB自编程序生成了随机人群步行荷载时程曲线。3.对闵行博物馆大跨悬挑楼盖结构进行了振动响应分析及计算,得到了在确定性荷载、随机荷载和同步调概率三种情况下悬挑楼盖结构的人致振动响应,并对三者的计算结果进行对比分析,分析表明了本文所提随机人群荷载模拟方法的合理性以及人群步行同步调概率统计的准确性。4.进行了大跨楼盖结构的现场测试及理论分析。以闵行区生态博物馆大跨悬挑楼盖为工程背景,进行了现场动力特性测试、减振前后人群步行荷载激励下的振动响应测试；同时采用与现场测试时相同的荷载工况进行了人致振动的有限元计算分析,计算结果与现场测试结果基本吻合,为后续计算分析奠定了基础。5.对大跨楼盖结构进行了振动响应控制。现场测试与理论计算表明,闵行区生态博物馆大跨悬挑楼盖结构在人群行走激励下的加速度响应峰值超过了规范限值,应进行振动控制。通过优化计算,决定采用6套TMD-黏滞流体阻尼器消能减振系统对结构竖向振动响应进行控制,理论计算与实测结果都表明振动控制效果非常明显。
[Abstract]:With the increasing amount of construction of long-span floor structure, the engineering cases which exceed the limit of human comfort occur from time to time, and more people pay attention to this kind of structure. At present, there are few researches on the vibration response law of this kind of long-span floor structure, and the engineering design practice is still lack of theoretical guidance, especially the research on vibration response and control under crowd load is not perfect. The main focus is on the uncertainty of the walking law of the crowd, so it is of great theoretical and engineering significance to establish a reasonable pedestrian load model for the rational design and normal use of the long-span floor structure. This paper takes the large span floor structure of high-speed railway station as the main research object. The main research work and results are as follows: 1. Statistical analysis of the walking characteristic parameters of the crowd. In this paper, the characteristic parameters of walking in the waiting halls of Nanjing South Station, Shanghai Hongqiao Station, Beijing South Station, Wuhan Station and Guangzhou South Station are analyzed by MATLAB video analysis program. The distribution law of the walking characteristic parameters of the five high-speed railway stations is obtained, and the normal distribution of the walking characteristics of the whole population is obtained from fen Nu 1.8811 ~ 0.17662). The uniform distribution of phase angle suit from 蠁 ~ (2 蟺): at the same time, the factors affecting the walking of people were statistically analyzed, and the normal distribution of synchronously adjusting probability of walking in the lobby was obtained by using the method of random probability distribution. The normal distribution of the synchronous adjustment probabilistic clothing of the waiting hall was obtained from pHN 0.1880 0. 05712). Finally, the relationship between the walking characteristic parameters and the population density was obtained by using the statistical parameters of different population densities, and the relationship between the walking characteristic parameters and the population density was obtained. Simulation of random crowd loads. Based on the characteristic parameters of walking, and referring to the single person walking load model suggested by IABSE, the time-history curve of walking load of random population is generated by MATLAB program. The vibration response of the long-span cantilevered floor structure of Minhang Museum is analyzed and calculated, and the human-induced vibration response of the cantilever floor structure under deterministic load, random load and synchronous adjustment probability is obtained. The results show that the method proposed in this paper is reasonable and accurate. Field test and theoretical analysis of long span floor structure are carried out. Taking the long-span cantilevered floor of Minhang Ecological Museum as the engineering background, the field dynamic characteristics were tested, and the vibration response of the crowd under the excitation of walking load before and after the vibration reduction was tested. At the same time, the finite element analysis of human-induced vibration is carried out under the same load condition as in the field test. The calculated results are in good agreement with the field test results, which lays a foundation for the subsequent calculation and analysis. The vibration response of long span floor structure is controlled. The field test and theoretical calculation show that the acceleration response peak of the long-span cantilevered floor structure of Minhang Eco-Museum under the excitation of the crowd walking exceeds the standard limit, so vibration control should be carried out. Through optimization calculation, it is decided to adopt six sets of TMD-viscous fluid damper energy dissipation system to control the vertical vibration response of the structure. The theoretical calculation and the measured results show that the vibration control effect is very obvious.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311.3

【参考文献】