Study on looseness characteristics of bolted joints of transmission towers under lateral vibration

transmission towers have been subjected to alternating loads caused by the galloping of iced conductors for a long time, and their fastening bolts are easy loosen or break, which seriously threatens safe operation lines. Through transverse vibration test M20 commonly used in towers, frequency amplitude changed, change law preload bolt joints is studied. The results show that with increase initial preload, decline speed clamping force decreases significantly; drop curve fitted shivakumar crews model, very consistent actual curve.