双回路直线输电塔(SZ451)空间抗震性能分析
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摘要
采用时程分析方法,运用通用有限元分析软件ANSYS研究了7度罕遇地震作用下,地震波输入维数以及频谱特性对SZ451型双回路直线型圆管角钢组合型输电塔地震反应的影响,通过对罕遇地震作用下输电塔导线、地线挂点位移的一维与三维输入和二维与三维输入的对比分析,以及采用快速傅里叶变换法对罕遇地震作用下的三维地震波输入时地震波的频谱特性分析。研究表明:该圆管角钢组合型输电塔在7度罕遇地震作用下的应力值仍然在弹性范围内,反映了该型塔良好的抗震性能;有无导线时,在用集中质量单元考虑导线影响后,挂点及塔架顶点的位移的分量变化主要体现在垂直于线路走向,顶点竖向位移会有增大;采用I类场地三种地震波作用,挂导线后,输电塔架的振动均有减弱;塔架顶点竖向位移要比导线和地线位移要小;地震波的频谱特性直接影响到输电塔的振动反应。
The 500kV double circuit intermediate tower consists of steel tubes and angel steels.Its earthquake resistance is rarely analyzed at present.In this paper,time history analysis is performed to investigate the earthquake resistance of the tower constructed in Guangzhou using general software ANSYS.Multi-dimension and power spectrum density of earthquake waves are considered.Fourier transform is used to perform the transform between time domain and frequency domain.The weights are calculated according to the span length of the transmission lines.Using mass elements,effects of wires on earthquake resistance are also studied.Some conclusions are drawn as follows:under 7 degree rarely-occurred earthquakes,the structural members are still in elastic;the additional displacements of suspension points and top point of the tower are mainly in Y direction that is perpendicular to the transmission line;reactions of the tower become smaller when the role of wires is considered in I-type area;considering the role of conducting and ground wires,vertical displacement of the top point of the tower is smaller than the displacements of suspension points of conducting and ground wires;considering the role of conducting and ground wires,vertical displacement of the top point of the tower is smaller than the displacements of suspension points of conducting and ground wires.
The 500kV double circuit intermediate tower consists of steel tubes and angel steels.Its earthquake resistance is rarely analyzed at present.In this paper,time history analysis is performed to investigate the earthquake resistance of the tower constructed in Guangzhou using general software ANSYS.Multi-dimension and power spectrum density of earthquake waves are considered.Fourier transform is used to perform the transform between time domain and frequency domain.The weights are calculated according to the span length of the transmission lines.Using mass elements,effects of wires on earthquake resistance are also studied.Some conclusions are drawn as follows:under 7 degree rarely-occurred earthquakes,the structural members are still in elastic;the additional displacements of suspension points and top point of the tower are mainly in Y direction that is perpendicular to the transmission line;reactions of the tower become smaller when the role of wires is considered in I-type area;considering the role of conducting and ground wires,vertical displacement of the top point of the tower is smaller than the displacements of suspension points of conducting and ground wires;considering the role of conducting and ground wires,vertical displacement of the top point of the tower is smaller than the displacements of suspension points of conducting and ground wires.
引文
[1]尹荣华,李东亮,刘戈林,等.高压输电塔震害及抗震研究[J].世界地震工程,2005,21(1):51-54.
[2]田利,李宏男.地震动差动下高压输电塔-线体系的纵向反应[J].地震工程与工程振动,2008,28(1):117-122.
[3]岳茂光,李宏男,王东升,等.行波激励下输电塔,导线体系纵向地震反应分析[J].中国电机工程学报,2006,26(23):145-150.
[4]朱碧蕾,胡文悌,李春祥.基于有限元分析高压输电塔结构的地震反应[J].地震工程与工程振动,2006,26(5):161-166.
[5]李睿,叶燎原,杨智本,等.曲线桥的空间地震响应分析[J].公路工程,2007,32(6):27-29.
[6]GB 50011—2001建筑抗震设计规范[S].
[2]田利,李宏男.地震动差动下高压输电塔-线体系的纵向反应[J].地震工程与工程振动,2008,28(1):117-122.
[3]岳茂光,李宏男,王东升,等.行波激励下输电塔,导线体系纵向地震反应分析[J].中国电机工程学报,2006,26(23):145-150.
[4]朱碧蕾,胡文悌,李春祥.基于有限元分析高压输电塔结构的地震反应[J].地震工程与工程振动,2006,26(5):161-166.
[5]李睿,叶燎原,杨智本,等.曲线桥的空间地震响应分析[J].公路工程,2007,32(6):27-29.
[6]GB 50011—2001建筑抗震设计规范[S].
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