良态风及台风不同风谱对结构风雨振反应对比分析  

Comparative analysis for wind and rain-induced responses of structures with normal wind and typhoon spectra

作　　者：付兴[1] 李宏男[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《振动与冲击》2015年第11期7-10,22,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金创新研究群体项目(51121005);国家自然科学基金重大国际合作项目(51261120375);国家重点基础研究计划(973计划)(2011CB013605)

摘　　要：为了比较良态风及台风风场对结构风雨耦合作用的影响,利用良态风及台风风谱生成风雨荷载时程曲线进行时程反应分析。首先介绍了常用的良态风和台风的不同风谱以及雨荷载计算模型,采用谐波叠加法生成脉动风速以及风雨荷载时程曲线,将风雨荷载施加在输电塔上进行分析,得到了不同情况下的输电塔顶点加速度均方根。计算结果表明,在风单独作用下或风雨共同作用下,由台风风谱计算的输电塔顶点加速度均方根大于良态风风谱的计算结果,良态风下的风雨振加速度均方根增大百分比大于台风的计算结果,最大达到了24.43%。因此在台风登陆期间应重视台风的高湍流度和降雨对结构的撞击作用。Normal wind and typhoon spectra were used to generate time history curves of wind and rain loads in order to compare the influences of normal wind and typhoon fields on wind and rain induced responses of structures.The harmonic superposition method was used to generate fluctuating wind speeds and time history curves of wind and rain loads with different spectra of normal wind and typhoon and the computing model of rain load.The responses of a transmission tower to wind and rain loads were calculated.Then,the RMSs of the acceleration at the top of the tower were obtained under different conditions.The calculation results showed that the root mean squares of the acceleration at the top of the tower obtained with typhoon spectra are bigger than those with normal wind spectra;the increasing percentage of the root mean squares of the acceleration with typhoon spectra is smaller than that with normal wind spectra,the maximal increasing percentage with normal wind spectra reaches 24.43%;so it＇s necessary to pay attention to the high turbulence intensity and the impact between structures and raindrops during typhoon.

关 键 词：台风 良态风 雨荷载 风速谱 输电塔 

分 类 号：TM753[电气工程—电力系统及自动化]