【作者】 梁佶；

【导师】 高博青；

【作者基本信息】 浙江大学 ， 结构工程， 2005， 硕士

【摘要】 斜拉网格结构是由塔柱，网格结构和斜拉索协同工作的空间组合结构，其造型简洁、受力合理。许多学者对斜拉网格结构已经做了很多研究，但对其风振响应的研究涉及不多，而且都没有考虑拉索风振的影响。本文考虑了拉索风振的效应，对斜拉网格结构的风振响应进行了深入研究。 脉动风的模拟是本文风振分析的前提。在总结结构风工程的基本理论和脉动风模拟方法(AR法)原理的基础上，运用AR法建立考虑空间相关性的脉动风模拟程序。算例结果表明，程序能够快速、有效的模拟脉动风速时程。 本文首先研究了单索的静力性能，自振特性和风振特性。采用拉索多单元模拟法分析拉索，将静力分析结果与悬链线理论解进行了对比，并将自振频率与琴弦理论解进行了对比。数值计算表明，本文采用的拉索多单元模拟法是可行的。在此基础上，分析拉索在不同的倾角和预应力水平下的风振响应，并分析索与风速的耦合效应的影响。结果表明，风对拉索的位移和内力影响都较小，索与风速的耦合效应的影响不明显。 为了研究拉索的自振和风振对斜拉网格结构的动力性能的影响，本文考虑了三种模型：无拉索的网格结构、拉索用拉杆模拟的斜拉网格结构(不考虑索自振，风振)、拉索用多单元模拟的斜拉网格结构(考虑索自振，风振)，比较这三种模型的静力特性、自振特性和风振特性。 从静力分析结果看，设置拉索后结构的变形减小，结构内力分布更为合理，拉索用拉杆模拟和多单元模拟的静力分析结果基本一致。 从结构自振特性分析的结果看，设置斜拉索后结构的基频得到提高。拉索的自振对结构的前20阶频率影响较小，拉索主要以第一振型参与结构振动。 从结构的风振分析结果看，设置斜拉索后结构的风振响应减小。拉索风振对结构的整体风振响应影响较小，只有当索力较小时才对部分拉索的内力有一定的影响。更多还原

【Abstract】 The cable-stayed spatial latticed structures were assembly structure, which combined towers, spatial latticed and cables. A lot of research on cable-stayed space spatial latticed structures had been carried out, but only a few studies involved the wind-excited vibration, and the influence of wind-excited vibration of cables was never considered. So some research on the performance of cable-stayed space was carried out in this thesis.Generation of wind speed records was the premise for the analysis of the wind-excited vibration in time history. According to autoregressive-type simulation methods, a program considering spatial correlativity was completed. Some numerical examples were illustrated to show the efficiency of the program.Firstly, the study on the static and dynamic behaviors of single cable was carried out in the paper. The cable was analyzed by multi-element in FEM, its static results were compared with catenary theory, its natural frequency was compared with the chord vibration theory. The examples were showed that this method was feasible. Based on the above research, the wind-excited vibration of the single cable in different inclination and the value of pre-stressed force was analyzed, and the wind coupling effect of the vibration was studied. As a result, the wind-excited vibration of the cable was relative small, the influence of the wind coupling effect was not evident either.For carrying on thorough research of the dynamic behavior of the structure, three model were concerned: a spatial latticed structure, a cable-stayed spatial latticed structure(the free vibration and wind-excited vibration of the cables were ignored), a cable-stayed spatial latticed structure(the free vibration and wind-excited vibration of the cables were considered).From the analysis of the static behavior of three models, the results revealed that the mechanics characteristic of the cable-stayed spatial latticed structure were more reasonable than the spatial latticed structure, and the static behavior of two kind of cable-stayed spatial latticed structure models were almost the same.From the analysis of the free vibration of the three models, the results revealed that the basic frequency of the cable-stayed spatial latticed structure was higher than the spatial latticed structure, and the free vibration of cables had only tiny influence on the ex-20 stages frequency of the structure.From the analysis of wind-excited vibration of the three models, the results revealed that the wind-excited vibration of the cable-stayed spatial latticed structure was smaller than the spatial latticed structure , and the wind-excited vibration of cables had only little influence on the structure. The wind just had slight influence on the cables, only when the force of cables was small.更多还原