Study on the influence of structural type of suspension tower on the first-order vibration mode of tower in light and medium ice area
The force of the suspended tower in the light and medium ice area is mainly controlled by the wind load,and the wind-induced effect is mainly affected by the direction of the first-order vibration mode of the tower.When the first-or-der vibration mode is transverse vibration in the direction of the cross arm,it conforms to the calculation assumption of the standard equivalent static load,and the calculated wind load effect is the most unfavorable.On the contrary,the calculat-ed wind-induced effect is not the most unfavorable,which may make the design unsafe.Therefore,it is very important to study the natural vibration characteristics of the transmission tower for its force.Based on the basic principle of structural mechanics and numerical simulation,the vibration mode characteristics of different structural types of suspension tower are studied.The research shows that when the suspension tower is drum-shaped,due to the short cross-arm,the mass of the cross-arm is relatively small,the torsion effect is weak,and the first-order vibration mode is transverse vibration.When the overhanging tower is arranged in the horn type(DC bipolar tower),due to the long cross arm,the mass of the cross arm is relatively large,the torsion effect is obvious,and the first-order vibration mode is torsion.When the suspended tower is a wine cup tower and a cat's head tower,the first-order vibration mode is mainly controlled by the relative speci-fication ratio of the tower window profile;combined with the conclusion of parameter analysis,the measures to ensure the first-order transverse vibration of suspended tower under different layout types are put forward.The research conclusion has certain guiding significance for engineering practice.
light to medium ice areasuspension towerstructure typefirst order modenumerical simulation
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