大跨屋盖结构风振分析及等效静风荷载研究

发布时间：2018-07-07 12:51

本文选题：大跨屋盖结构 + 风振　；参考：《哈尔滨工业大学》2010年硕士论文

【摘要】：近几十年来,大跨屋盖结构得到了前所未有的发展,被广泛用于体育场馆、会议展览中心、机场航站楼等大型公共建筑中。随着大跨屋盖结构向长大化和轻质化的方向发展,结构对风荷载的敏感性日益增强,风荷载已成为该类结构设计中的主要控制荷载。与此同时,关于大跨屋盖结构的抗风设计理论还相当薄弱,这已成为制约这种结构类型进一步发展的瓶颈。因此对大跨屋盖结构的抗风设计理论和方法进行系统研究,具有十分重要的理论意义和工程价值。本文主要采用风洞试验的数据结果,并通过ANSYS有限元程序和MATLAB等编程程序对大跨屋盖结构的风振响应和等效静力方法进行了研究和分析。本文首先简要介绍了近地风的特性,以及目前对于大跨屋盖结构的风振分析及等效静风荷载研究的一些国内外研究现状,然后介绍了目前应用的一些风洞试验的方法,并分别简要介绍了不同的风洞试验的优缺点。通过在ANSYS中对三个实验模型的建模,分析了大跨屋盖结构的自振的特性。然后在ANSYS中对其在时域范围内的计算来确定了模型的安全性已经得到了保障。通过MATLAB编程在频域范围内对结构的风振响应进行计算,通过采用不同的模态对模型计算和分析,并分别采用了考虑模态耦合项和没有考虑模态耦合项的影响对其模型进行了计算。对于大跨屋盖结构的频域范围内的计算,一定要考虑高阶模态的影响,而且模态耦合项对于大跨计算精度的影响是比较严重的。对等效静风荷载的研究和分析,分别通过LRC法和基于LRC法的改进型计算方法对模型进行了计算分析。通过对不同模型的计算和分析,发现LRC法是一种精确的计算等效静风荷载的计算方法。
[Abstract]:In recent decades, the long-span roof structure has been an unprecedented development, widely used in sports venues, convention and exhibition center, airport terminal and other large-scale public buildings. With the development of long-span roof structure in the direction of growing up and light weight, the sensitivity of the structure to wind load is increasing, and wind load has become the main control load in the design of this kind of structure. At the same time, the wind-resistant design theory of long-span roof structure is still weak, which has become a bottleneck restricting the further development of this type of structure. Therefore, it is of great theoretical significance and engineering value to systematically study the wind-resistant design theory and method of long-span roof structures. In this paper, the results of wind tunnel test are adopted, and the wind-induced vibration response and equivalent static method of long-span roof structures are studied and analyzed by ANSYS finite element program and MATLAB program. In this paper, the characteristics of near-ground wind and the research status of wind vibration analysis and equivalent static wind load of long-span roof structures at home and abroad are briefly introduced in this paper. Then, some wind tunnel test methods used at present are introduced. The advantages and disadvantages of different wind tunnel tests are also briefly introduced. By modeling three experimental models in ANSYS, the characteristics of natural vibration of long span roof structure are analyzed. Then the security of the model is ensured by the calculation in time domain in ANSYS. The wind-induced vibration response of the structure is calculated by MATLAB programming in frequency domain, and the model is calculated and analyzed by using different modes. The model is calculated by considering the modal coupling term and not considering the influence of the modal coupling term. For the calculation of long-span roof structures in frequency domain, the influence of high-order modes must be taken into account, and the influence of modal coupling term on the accuracy of long-span calculation must be serious. For the study and analysis of equivalent static wind load, the model is calculated and analyzed by the LRC method and the improved calculation method based on LRC method respectively. Through the calculation and analysis of different models, it is found that the LRC method is an accurate method for calculating the equivalent static wind load.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TU312.1;TU399

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