110kV双回路窄基角钢塔结构抗震分析
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摘要
本文以安徽宿州某一输电线路双回路窄基角钢塔SJZJT为研究背景,建立了合理的力学模型,利用有限元法研究了该塔的动力特性。通过对窄基塔的模态振型分析,得到结构前若干阶自振周期,其第一阶周期与来自试验的经验公式和《建筑结构荷载规范》(GB 50009-2012)中的规范值相比较,前者结果与本文结果相比吻合,后者偏差较大。通过输入了垂直于导线方向的El-Centro波和Kobe波,对该塔进行了动力时程分析,分析对比了地震工况下塔顶处位移时程曲线和4个横担处最大位移值,其中Kobe地震波工况对窄基塔的影响较大。对比分析了不同横隔面输电塔模型在Kobe波作用下的位移响应,得到在输电塔底部增加横隔面会提高输电塔的抗震性能。本文结果为窄基角钢塔的研究提供了参考。
In this paper,the dynamic characteristics of a double-loop narrow-base angle steel tower were studied from the transmission power engineering in Suzhou of Anhui. The reasonable mechanical model of the tower was established.The useful several natural periods of vibration of the tower is achieved by modal analysis with the finite element method. Then compared the first natural period from the present approach with the computed values of the empirical formula from the test of typical angle steel tower and high building design code,the result of the former agrees with one of the present paper and one of the latter is wrong. Then the seismic time-history analysis of the narrow-base angle steel tower is done by inputting the El-Centro wave and Kobe wave along X direction which is perpendicular to the transmission line. The displacement of time-history curve at the top of the tower and the maximum displacement of the four cross arms are given. The computed results demonstrate that Kobe wave has a much greater influence for the tower. The displacement response of different transversal transmission tower model under Kobe wave is analyzed,and the seismic performance of the transmission tower is improved by increasing the transverse plane at the bottom of the transmission tower. The results of the present paper provide some references for the research of the angle steel tower.
In this paper,the dynamic characteristics of a double-loop narrow-base angle steel tower were studied from the transmission power engineering in Suzhou of Anhui. The reasonable mechanical model of the tower was established.The useful several natural periods of vibration of the tower is achieved by modal analysis with the finite element method. Then compared the first natural period from the present approach with the computed values of the empirical formula from the test of typical angle steel tower and high building design code,the result of the former agrees with one of the present paper and one of the latter is wrong. Then the seismic time-history analysis of the narrow-base angle steel tower is done by inputting the El-Centro wave and Kobe wave along X direction which is perpendicular to the transmission line. The displacement of time-history curve at the top of the tower and the maximum displacement of the four cross arms are given. The computed results demonstrate that Kobe wave has a much greater influence for the tower. The displacement response of different transversal transmission tower model under Kobe wave is analyzed,and the seismic performance of the transmission tower is improved by increasing the transverse plane at the bottom of the transmission tower. The results of the present paper provide some references for the research of the angle steel tower.
引文
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[12]傅鹏程,邓洪洲,吴静.输电塔结构动力特性研究[J].特种结构,2005(01):47-49.
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[15]中国电力工程顾问集团西北电力设计院.电力设施抗震设计规范[S]GB 50260-2013.北京:中国计划出版社,2013.
[2]罗玉鹤.110kV窄基钢管塔的研究设计[J].电力建设,2010,31(08):25-28.
[3]吴昊亭.轻型落地式回转双平臂钢抱杆的特殊环境组塔施工应用[J].电力建设,2010,31(08):32-37.
[4]邓洪洲,吴昀,刘万群,等.大跨越输电塔结构风振系数研究[J].特种结构,2006(03):66-69.
[5]李宏男,白海峰.高压输电塔-线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007(02):39-46.
[6] Ghobarah A,Aziz T S, EI-AttarM. Response of transmission lines to multiple support excitations[J].Engineering Structures,1996,18(2):936-946.
[7] Zheng H D,Fan J,Long X H. Analysis of the seismic collapse of a high-rise power transmission tower structure[J]. Journal of Constructional Steel Research,2017,134:180-193.
[8]杜伟,罗正帮,杨雪峰,等.高压输电铁塔结构强度和稳定性分析与加固[J].合肥工业大学学报(自然科学版),2015,38(1):69-74.
[9]盛宏玉.结构动力学[M].合肥:合肥工业大学出版社,2007:63-85.
[10]葛俊颖.桥梁工程软件Midas civil使用指南[M].北京:人民交通出版社,2013:358-384.
[11]中国建筑科学研究院.建筑抗震设计规范:GB 50011-2010[S].北京:中国建筑工业出版社,2010.
[12]傅鹏程,邓洪洲,吴静.输电塔结构动力特性研究[J].特种结构,2005(01):47-49.
[13]中国建筑科学研究院.建筑结构荷载规范:GB 50009-2012[S].北京,中国建筑工业出版社,2012.
[14]王亚勇,戴国莹.建筑抗震设计规范算例[M].北京:中国建筑工业出版社,2005:18.
[15]中国电力工程顾问集团西北电力设计院.电力设施抗震设计规范[S]GB 50260-2013.北京:中国计划出版社,2013.