雷达塔频率控制和地震反应分析
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摘要
为了避免周围建筑对雷达工作的影响,雷达塔通常高达100 m左右,由于雷达工作性能的要求,雷达塔的基频不得小于1.0 Hz,对于如此高大的结构,如何控制其频率,是值得研究的问题。通过大量计算和分析,得出了一些可以显著提高雷达塔的基本频率的规律。同时,应用反应谱法、时程分析法和随机振动法,分析了雷达塔的地震反应。计算结果表明,雷达塔能够满足中国地震规范对层间位移的要求。
For the sake of avoiding the impact of surrounding buildings on the radar,radar tower is usually high,generally up to 100 meters.As the radar performance reasons,the required fundamental frequency of radar tower should not be less than 1 Hz.For such a tall building,how to control the frequency of radar tower is an issue worth studying.Through a lot of calculations and analyses,paper reaches a number of laws to increase frequency.In the above structural frequencies adjustment methods,setting leaning bracing and reducing the top mass of the structure are the most obvious effects of all.At the same time,paper also discusses on the seismic response of radar tower.Analyses used for earthquake are response spectrum method,time history analysis method and random vibration analysis.Three methods of calculation results show:radar tower performance meets China's seismic code to regulate specifications of the story drift limits.
For the sake of avoiding the impact of surrounding buildings on the radar,radar tower is usually high,generally up to 100 meters.As the radar performance reasons,the required fundamental frequency of radar tower should not be less than 1 Hz.For such a tall building,how to control the frequency of radar tower is an issue worth studying.Through a lot of calculations and analyses,paper reaches a number of laws to increase frequency.In the above structural frequencies adjustment methods,setting leaning bracing and reducing the top mass of the structure are the most obvious effects of all.At the same time,paper also discusses on the seismic response of radar tower.Analyses used for earthquake are response spectrum method,time history analysis method and random vibration analysis.Three methods of calculation results show:radar tower performance meets China's seismic code to regulate specifications of the story drift limits.
引文
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[2]李杰,李国强.地震工程学[M].北京:地震出版社,1992:84-90.
[3]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:42-45.
[4]吴泽玉.基于结构安全性的自振频率控制方法的研究[D].郑州:郑州大学,2004.
[5]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]张治勇,孙柏涛,宋天舒.新抗震规范地震动功率谱模型参数的研究[J].世界地震工程,2000,16(3):33-38.
[7]欧进萍,牛荻涛.地震地面运动随机过程模型的参数及其结构效应[J].哈尔滨建筑工业大学学报,1990,23(2):24-33.
[8]孙景江,汪近仁.与规范反应谱对应的金井清谱的谱参数[J].世界地震工程,1990,8(1):42-48.
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