大跨越输电塔线体系地震反应分析
|
摘要
以广东省汕头市的500 kV榕江大跨越输电塔为背景,建立了塔线体系的空间有限元模型,采用振型分解反应谱法和时程分析法对其三向输入时的多遇地震反应进行了计算。对塔线体系动力特性进行了分析总结,对两种计算方法的结果进行了比较,并对大跨越输电塔中的控制杆件在地震作用下的内力和设计控制内力进行了对比研究。结果发现,单塔的频率大于塔线体系中塔的频率,但两者较为接近;塔线体系的地震响应小于单塔,导地线对输电塔抗震是有利的;地震效应在该塔设计中不起控制作用,但下横担拉杆和塔身二次变坡以下的K型支撑在地震作用下的设计轴力为设计控制轴力的90%,是结构抗震设计中的相对薄弱部位。对于大跨越高塔来说,抗震设计时考虑地震工况对横担主材拉杆、横担处塔身上横隔面主材和部分塔身斜材的影响是很有必要的。
Under the background of 500kV Rongjiang large crossing transmission tower-line system in Shantou,Guangdong province,a spatial finite element model of the system was established,its seismic responses were computed by using the mode-decomposition method and the time-history analysis method,respectively.Its dynamic characteristics were summarized and comparisons of the results of the two methods were conducted.Moreover,contrastive analysis of the internal forces and the designed critical forces of the key members was performed.It was found that the frequencies values of the single tower is larger than those of the tower in the system,but they are close to each other;the responses of the system are smaller than those of the single tower;the lines is benefit for the tower when considering earthquake action and seismic effects are not a critical factor for tower design;however,tensile members in cross arm and K bracing under the second slope are weak sections,the ratio of whose axial forces and critical forces approximately is 90%.So,it was necessary to consider the effects of earthquake actions on tensile members in cross arm and bracing members of tower body for large crossing transmission tower designs.
Under the background of 500kV Rongjiang large crossing transmission tower-line system in Shantou,Guangdong province,a spatial finite element model of the system was established,its seismic responses were computed by using the mode-decomposition method and the time-history analysis method,respectively.Its dynamic characteristics were summarized and comparisons of the results of the two methods were conducted.Moreover,contrastive analysis of the internal forces and the designed critical forces of the key members was performed.It was found that the frequencies values of the single tower is larger than those of the tower in the system,but they are close to each other;the responses of the system are smaller than those of the single tower;the lines is benefit for the tower when considering earthquake action and seismic effects are not a critical factor for tower design;however,tensile members in cross arm and K bracing under the second slope are weak sections,the ratio of whose axial forces and critical forces approximately is 90%.So,it was necessary to consider the effects of earthquake actions on tensile members in cross arm and bracing members of tower body for large crossing transmission tower designs.
引文
[1]李宏男,石文龙.大跨越高压输电塔体系抗震分析几个关键问题研究[C].防震减灾工程研究与进展—全国首届防震减灾工程学术研讨会论文集,2004:1-6.
[2]李宏男,陆鸣,王前信.跨越浑河输电塔电缆体系的简化抗震计算[J].沈阳建筑工程学院学报.1997,30(5):28-36.
[3]瞿伟廉,殷惠君,陈波.输电线路动力分析的多质点模型研究[J].华中科技大学学报,2003,20(2):1-5.
[4]邓洪洲,朱松晔,王肇民.大跨越输电塔线体系动力特性及风振响应[J].建筑结构,2004,34(7):25-28,10.
[5]全伟,李宏男,岳茂光.多点激励下输电塔-导线体系纵向地震反应分析[J].振动与冲击,2008,27(10):75-80.
[6]沈国辉,孙炳楠,何运祥,等.大跨越输电塔线体系的地震响应研究[J].工程力学,2008,25(11):212-217.
[7]闫祥梅,何敏娟,马人乐.高压输电塔同步环境脉动实测分析与对比[J].振动与冲击,2010,29(3):77-80.
[8]付鹏程,邓洪洲,吴静.输电塔动力特性研究[J].特种结构,2005,22(1):47-49.
[9]电力设施抗震设计规范(GB50260-96).
[10]建筑抗震设计规范(GB 50011-2001)(2008年版).
[11]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992.
[12]110 kV～750 kV架空输电塔线路设计规范(GB 50545-2010).
[13]唐国安.浅析输电塔设计中的埃菲尔效应[J].电力建设,1999,8:30-32.
[2]李宏男,陆鸣,王前信.跨越浑河输电塔电缆体系的简化抗震计算[J].沈阳建筑工程学院学报.1997,30(5):28-36.
[3]瞿伟廉,殷惠君,陈波.输电线路动力分析的多质点模型研究[J].华中科技大学学报,2003,20(2):1-5.
[4]邓洪洲,朱松晔,王肇民.大跨越输电塔线体系动力特性及风振响应[J].建筑结构,2004,34(7):25-28,10.
[5]全伟,李宏男,岳茂光.多点激励下输电塔-导线体系纵向地震反应分析[J].振动与冲击,2008,27(10):75-80.
[6]沈国辉,孙炳楠,何运祥,等.大跨越输电塔线体系的地震响应研究[J].工程力学,2008,25(11):212-217.
[7]闫祥梅,何敏娟,马人乐.高压输电塔同步环境脉动实测分析与对比[J].振动与冲击,2010,29(3):77-80.
[8]付鹏程,邓洪洲,吴静.输电塔动力特性研究[J].特种结构,2005,22(1):47-49.
[9]电力设施抗震设计规范(GB50260-96).
[10]建筑抗震设计规范(GB 50011-2001)(2008年版).
[11]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992.
[12]110 kV～750 kV架空输电塔线路设计规范(GB 50545-2010).
[13]唐国安.浅析输电塔设计中的埃菲尔效应[J].电力建设,1999,8:30-32.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心