强风作用下高压输电塔线体系耦联振动及动力破坏机理研究

Collapses of high voltage and extra-high voltage transmission towers caused by strong wind storms frequently occur in China recently. Due to the complexity of wind-induced vibration of transmission tower-line coupling system, as well as the unclear understanding on the character and mechanism for this kind of strongly nonlinear coupled vibration, the failure mechanism for the transmission tower-line system remains a challenging research issue..Based on the field investigation on some typical collapse accidents of 500kV transmission tower happened in the past few years, the in-situ monitoring on wind-induced vibration of 500kV transmission tower as well as wind tunnel tests on aeroelastic model of tower-line coupling system would be conducted in this subject. The stochastic nonlinear dynamic responses under strong wind and the analysis method for wind-induced vibration of high-voltage transmission tower-line system would be concerned. Also, the aerodynamic damping character for the coupling system, tension stiffness and the dynamic tension of the conductors would be studied. The wind load formation mechanism, its transfer path as well as the energy transferring among conductors, insulator, and tower structures would be examined. The dynamic failure mechanism for transmission tower structures caused by nonlinear coupled vibration would be investigated. In addition, the transition of failure modes owing to adding diaphragms on the tower body would be emphasized. According to the research work hereinbefore, the suggestion on wind-resistant design and calculation method considering dynamic interaction between tower and conductors would be put forward for the transmission tower structures.

近些年来，由于强风暴所造成的高压以及超高压输电塔倒塌事故在我国时有发生。由于输电塔线体系之间风振的复杂性以及塔线之间的强非线性耦联振动的特征和机理并不明朗，输电线路塔线体系的风致破坏机理仍是一个难题。.本课题拟以几次典型的500kV输电塔风致倒塌事故现场调研资料为基础，以500kV输电线路风振的现场监测和输电塔线耦联体系完全气弹模型风洞实验为实验手段,研究强风作用下高压输电塔-线耦联体系非线性随机动力响应特征和风振分析方法、输电塔线耦联体系的气动阻尼特性、导线的张力刚度特性以及动张力的形成机理和特征、风荷载在导线-绝缘子-输电塔之间的传递途径和能量转移特性，研究导线与输电塔间的非线性耦联振动所导致的输电塔动力破环机理以及塔身结构不同横隔面配置方式下输电塔破坏机制转移。在此基础上，给出考虑塔线耦联体系动力耦联作用的输电塔结构抗风设计计算方法建议。

近年来，我国沿海地区不断有强台风登陆所导致的高压及超高压输电塔的倒塌事故发生。由于输电塔线体系之间风振的复杂性以及塔线之间的强非线性耦联振动的特征和机理并不明朗，输电线路塔线体系的风致破坏机理仍是一个难题，同时，倒塔事故后的电力系统快速恢复工作也对输电塔加固环节提出了需求。.本项目以某典型500KV输电塔风致倒塌事故现场调研资料为基础，以该500kV输电线路风振输电塔线耦联体系完全气弹模型风洞实验为实验手段，研究强风作用下高压输电塔-线耦联体系非线性随机动力响应特征和风振分析方法、输电塔线耦联体系的气动阻尼特性、导线的气动特性以及导线屏蔽效应特性、风荷载在导线-绝缘子-输电塔之间的传递途径和能量转移特性，研究导线与输电塔间的非线性耦联振动所导致的输电塔动力破环机理。在此基础上，给出考虑塔线耦联体系动力耦联作用的输电塔结构抗风设计计算方法建议。