Experimental investigation on refurbishment of transmission line tower leg member

摘要

Experiments were conducted to investigate the static response of Transmission Line Tower during Refurbishment of Tower Leg work. A full scale 66 kV double circuit tower of 26.84 m tall and base width equal to 4.1 m x 3.05 m was investigated at Tower Testing and Research Station, SERC, Chennai, India. A special grip system with counter weights base reaction was applied on the structure. The foundations were simulated to actual field conditions by reconstructing reinforced concrete foundations. Three directional namely, Transverse, vertical and Longitudinal loads were applied through high strength steel wire ropes which are connected to sophisticated mechanical actuators. The tower was loaded for normal condition with 20 hour waiting period, earth wire and top conductor broken wire condition with one hour waiting period. The structural deflection response at peak was observed by simulating loading conditions and compared with the deflection obtained while gas cutting one tension leg just above the ground level position. The investigation showed that the structure would be stable with reasonable deflection and no permanent distortion had occurred in any of the tower members during retro-fitting of the leg member using the above experimental methodol-ogy.