摘要
伴随城市规模的不断扩大和人口的日益增加,越来越多的高层建筑在铁路边缘建立。随着人们对生活质量要求的日渐提高,轨道交通系统对人们的生活环境及工作环境的影响引起了公众的重视。交通荷载引起的环境振动和噪声影响目前已经被列为世界七大环境公害之一。因此极有必要对列车运行引起的振动及减隔振措施展开深入研究。
在列车运行引起的建筑物振动这一研究领域中,各学者提出不同的方法来计算列车激振荷载,正确的荷载输入机制存在很大争议。在本文中,通过对以往研究成果的分析研究,针对其不足加以改进,提出一个相对简单、实用的方法来确定列车荷载。通过数值模拟的方法,对比两种加载机制作用下建筑物反应差别从而提出何种加载模式更为合理,为进一步研究提供基础。
对于交通荷载引发的建筑物振动减隔振措施,六十年代就有学者开始研究,如利用空沟、地下连续墙等减弱振动对建筑的影响。在铁路沿线建立隔离沟能有效降低列车振动对周围建筑的影响,针对影响隔振沟隔振效果的多参数效应,将正交实验法的概念引入以期用较少计算次数综合分析各因素的影响。本文先介绍了隔振沟阻断机理,并通过数值模拟分析了沟的各参数变化对其隔振效果的影响,最后对传统隔振沟加以改进提出了几种新型隔振形式并分析其隔振效果。
将结构优化设计的概念首次引入到列车运行引起建筑物振动领域中,用ANSYS参数化设计语言APDL编程并开发,在保证隔振效果满足标准要求的前提下,寻求隔振沟的最佳参数组合,使隔振沟所需填充材料最省,体积最小。
More and more buildings are established next to railways because of the expansion of city size and population. As the life quality requirements of residents rises every day, we pay more attention to environment influence caused by rail traffic system. The invironmental vibration and noise caused by traffic have been listed as one of the Seven Wonders of the World environmental ahzards. So it's extremely necessary to further study structural vibration caused by traffic and effective vibration isolation measures.
In the research field ofbuilding-vibrations caused by railway traffic, there are many different methods to calculate the train vibratoty lods, besides, correct load input mechanism has a lot of controversy. In this paper, one relatively simple and practical way is introduced based on the modification of previous study; With the help of numerical simulation, the author determine a reasonable input method based on the structural reaction differences and provide a basis for further research.
Many scholars began to research measures of vibration isolation early in60s, such as empty ditch, underground continuous wall, etc. Setting up isolation groove along the railway can effectively reduce the train vibration effects on surrounding buildings. In view of the multiparameter effect isolation ditch, this paper adopts orthogonal experiment to research the influences of each parameter. This paper introduces the block mechanism of isolation trench firstly, with the help of numerical simulation analysis to analys the effect of every parameter, finally, the author proposes several new form isolation gloves and analyzes its isolation effect.
This paper introduces the structure optimization design concept to the field of building vibrations caused by railway traffic for the first time, the author use APDL to programme in order to seek the best combination of each trench parameter.
引文
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