This paper takes an all around test to the crack in the concrete foundation of the Luo huai high voltage line iron towers.

Dynamic behavior and stability of transmission tower-line system under wind (rain) forces;

The dynamic model and analytical method for analyzing transmission tower-line system incorporated with MR dampers are provided for in-plane/out-of-plane vibration.

The wind-induced vibration control of transmission tower-line system is carried out in this study.

Advances in research of wind-induced vibration of long-span high-voltage transmission line system;

EHV transmission system consisting of long span transmission lines and towers is an integrity as a structure,in the process of design,the strength calculation of the conductor and the tower is independent,it is difficult to compute the longitudinal unbalanced tension of the tower.

Being the vital lifeline system, the destruction of transmission system is destroyed will lead to the damage of power system, which cause fire disaster and property loss.

Based on finite element analysis method,this paper establish whole element model of 500kv jiangcheng line 1625#～1627#transmission system,which used the beam element and the cable element.

In this paper,the freezing-rain-ice and wind loads on the transmission tower-line system are simulated with consideration of the model of freezing-rain-ice and the rain classification according to the theory of fluid induced vibration.

Considering the influences of height difference,ice increasing,asymmetrical distribution of ice on conductors and wind load,nonlinear buckling analysis of transmission tower-line system under ice load and wind load was carried out.