微波塔水平抗震性能分析

【作者】 吴建光；

【导师】 舒兴平；

【作者基本信息】 湖南大学 ， 结构工程， 2003， 硕士

【摘要】 对于高耸钢结构，多年来人们一致认为风荷载对结构的设计起着控制作用，而着重研究其抗风性能，较少考虑结构的地震作用。对工程中常用的微波塔的抗震性能，近年来仅对其中的屋面塔进行过少量的研究，本文对微波塔水平抗震性能及几种主要因素的影响进行了分析研究。 本文共计六章。第一章对国内外在高耸结构的抗震这一领域所做的研究工作进行了综合的评述；第二章系统地介绍了高耸结构的动力分析方法以及本文的模型；第三章分析了微波塔在水平地震荷载作用下的动力响应的基本特征，分析了平台、地基刚度、避雷针等对微波塔水平抗震性能的影响，结果表明地基刚度对微波塔的动力响应影响很小，平台和避雷针对微波塔的抗震有一定程度的影响。第四章分析了平台的质量变化、高度变化和避雷针的质量变化、刚度变化对微波塔抗震性能的影响，结果表明微波塔的内力和位移随平台质量和高度的增加先增加，后减小，随避雷针刚度和质量的增加而不断减小。第五章依次分析了斜杆与主杆截面积比、下部杆件与上部杆件截面积比、结构的高宽比这几个参数变化对微波塔在水平地震作用下的内力、应力和位移的影响规律和影响范围，结果表明这些参数对微波塔的地震响应影响很大，而且影响规律比较明确和一致：斜杆截面积越大，主杆应力越大，斜杆应力越小，位移越大；下部杆件增大，使杆件截面突变处产生很大的应力；结构高宽比越大，杆件应力越小，位移越大。第六章根据前面各章的分析和结果，推导和回归了微波塔在水平地震作用下的应力和位移响应的经验公式，该公式计算简便，避免了计算地震作用的通常做法，可用于手算，对于设计工作有一定的实际意义。结论部分对全文进行了总结，并提出了一些建议。更多还原

【Abstract】 To the high-rise steel structure, it is consistently thought that the structure’s design is controlled by the wind load, so the wind-resistance characters are detailedly researched and the structure’s earthquake load is neglected. To the communication tower in common use in engineering, only the housetop tower’s horizontal vibration-resistance characters is studied in few literatures. The communication towers’ horizontal vibration-resistance characters and some main influence factors are studied in this thesis.There are 6 chapters in this thesis. Chapter 1 is a review of the research works of high-rise structures. In chapter 2, the methods to analyses the high-rise structure and the model in this thesis are formulated. In chapter 3, the communication tower’s basic characters under horizontal earthquake effect is analyzed, and the flat form, the groundsill, the lighting rod’s effect is considered. The result shows us that the groundsill’s stiffens has little infection, but the flat form and the lighting rod have more infection. In chapter 4, the influence by the changing of the plat form’s mass, height and the lighting rod’s mass, stiffness is considered. The result shows us that the structure’ s internal force and displacement increases, then descends when the fiat form’s mass or height is added, and are added all along with the lighting rod’s stiffness and mass’s enhance. In chapter 5, the infections by the changing of the ratios of titled pole section vs. the vertical pole section, of the pole section lower part vs. upside, of structure’s height vs. width are analyzed one by one. The result shows us that the first ration’s incensement brings that the vertical poles’ stress becomes greater and the titled poles’ stress becomes less and the displacement becomes greater; the first ration’s incensement brings the larger stress in section break; the last ration’s decline brings the less stress and greater displacement. In chapter 6, the experience formulas about stress and displacement are inferred. These formulas are very simple, and can be used in hand. In these formulas, the process to calculate the load of earthquake as common is not needed. In last part of this thesis, the conclusions of the whole researcher works are reached and some suggestion is put forward.更多还原