输电塔在线路断线作用下的动力响应  

DYNAMIC RESPONSE OF TRANSMISSION TOWER WITH RUPTURED WIRES

作　　者：夏正春[1] 李黎[1] 梁政平[1] 段松涛[2] 

机构地区：[1]华中科技大学土木工程与力学学院 [2]中南电力设计院,武汉430071

出　　处：《振动与冲击》2007年第11期45-49,共5页Journal of Vibration and Shock

基　　金：国家"十一五"特高压输电工程关键技术研究

摘　　要：目前采用的拟静力法考虑线路的断线不平衡张力不能反映出输电塔受到的断线动力响应。针对这一问题,利用有限元程序ANSYS/LS-DYNA,建立导地线模型和以等效弹簧代替导地线对输电塔作用的塔-弹簧模型,将导地线模在断线作用下悬垂点的支座反力反向施加在塔-弹簧模型上,数值仿真了输电塔在导地线断线作用下的动态响应。研究表明,线路断线对输电塔的动力效应不可忽视。At present the imbalance tension of suddenly ruptured wire is asually calculated approximately with pseudo-static method, which could not indicate the dynamic response of tower under the case of broken wire.To solve the problem, electric wires and tower-spring models are established respectively by use of ANSYS/LS-DYNA. The action of transmission lines to tower is substituted with equivalent spring in tower-spring model. In ground wire and conductor wire models the dynamic force at overhung point under the action of ruptured wire is taken as shock excitation load, then the dynamic responses of tower can be obtained by finite element calculation. Results show that dynamic effection of transmission tower induced by broken wires cannot be ignored.

关 键 词：输电塔 断线 等效弹簧 动力响应 ANSYS/LS-DYNA 

分 类 号：TU311.3[建筑科学—结构工程]