【作者】 王占国；

【导师】 鲍文博；

【作者基本信息】 沈阳工业大学 ， 固体力学， 2009， 硕士

【摘要】 风荷载是高层建筑主要侧向荷载之一,结构在风荷载作用下动力学分析能为高层建筑设计提供科学依据。目前顺风向风荷载的研究相对比较成熟,通常应用谱分析方法来描述脉动风压,以平均风压与脉动风压的共同作用来分析结构风荷载下的结构动力响应。各国规范对风荷载计算一般都作了相应简化,以简化公式的形式应用于工程实践。对于结构在风荷载作用下横风向上的动力响应,由于来风受到顺风向壁面的阻挡,发生漩涡破碎和风向改变,与顺风发生剪切撞击使得风力结构进一步复杂。目前我国在横风向风载计算上只对圆形截面结构作了工程上简化计算叙述,对其它界面形式未作详细描述。日本和加拿大规范对矩形截面结构横风向风荷载作用做了相应简化计算。本文在对前人研究成果学习总结基础上,利用随机振动理论以及科学计算软件模拟工程结构在风荷载作用下响应结果,通过非耦合作用与耦合作用的对比分析,得出相应的风与高层高耸结构耦合作用的动力学分析结果。本文仿真模拟了脉动风荷载,并以此荷载施加于多个建筑结构,当考虑风与结构耦合作用时,其位移和加速度峰值都有所减小,当采用同样平面形式、改变结构总体高度或构件尺寸耦合作用与非耦合作用作对比,结果显示,随高度增加,结构频率降低,耦合作用有所增强,因此在结构设计中今后应考虑风与高层高耸结构耦合作用的影响。横风向风荷载作用机理较为复杂,本人在总结前人工作的基础上,利用简化公式得到不同高度结构横风向响应数据,并与顺风向响应比较,计算结果表明,结构随高度增加,其风振响应中横风向响应有增大趋势。更多还原

【Abstract】 Wind load is one of high-rise construction main lateral loads, under the structure wind load function dynamics analysis provides scientific basis for the high-rise construction design. At present the running free windward load research relative quite mature, The usual application spectrum analysis method describes the pulsation wind pressure, does together by the average wind pressure and the pulsation wind pressure uses for to analyze the structure power response under the structure wind load. The various countries’ standard all has made the corresponding simplification , the reduction formula form applies in the project practice. Regarding structure under wind load function crosswind upward power response, because comes the wind to receive running free to the wall surface impediment, has the vortex tattered and wind direction change, with the running free wind cutting hit ,the wind power become further complex. At present our country in the computation in the structure crosswind only to make in the project to the circular section structure to simplify the computation narration, has not made the detailed description on other contact surface form. description on other contact surface form. Japanese and the Canadian standard has made the corresponding simplification computation to the rectangular section structure by crosswind windward load function.This article to predecessor research results study summary, we use random vibration theory as well as the science computation software simulation engineering structure responds the result under the wind load function, through the non-coupling function and the coupling function contrast analysis, obtains the corresponding wind and high-level stands tall and erect the structure coupling function dynamics analysis result.This article simulation pulsation wind load, and exerts by this load to many constructs, when consideration wind and structure coupling function, its displacement and the acceleration peak value all have reduce, when uses the similar plane form, the change structure overall highly or the component size coupling function makes the contrast with the non-coupling function, finally demonstrated, along with increases highly and the structure frequency reduces the coupling function to have the enhancement, therefore in the structural design will be supposed to consider from now on the wind and high-rise structure coupling function influence. The crosswind windward load action mechanism complexity, In work foundation of predecessor works, obtains the response data on different highly structure by used the reduction formula of crosswind, and with compares the response of running free, the computed result indicated, the structure along with increases highly, The response of crosswind has increases tendency.更多还原