Dynamic Analysis of 110 kv Double-circuit Compound High-strength Hollow Mezzanine Concrete-filled Steel Tube Pole

Abstract

Combined with the simplified mechanical model of the pole-line system, the dynamic stability of 110kV hollow mezzanine concrete pole is analyzed and its dynamic equation is established. The main resonance mode in the plane is analyzed by the approximate analytical method, and the stability is determined and solved by the stability theory. The characteristics of wind-induced vibration are revealed from the perspective of nonlinear dynamics. Based on Hamilton principle, the partial differential equation of motion of the simplified dynamic analysis model of the tower column is established, and it is discretized into ordinary differential equation by Galerkin method. Finally, the critical frequency equation is established according to the method proposed by Bolotin, so as to obtain the dynamic stability region and instability region of the tower column. Based on the B-R motion criterion, the nonlinear dynamic stability of the pole-line system is studied, and the initial pretension, wind direction angle and span of the cable are selected for parameter analysis. The influence of these parameters on the nonlinear dynamic stability critical load of the hollow mezzanine concrete pole line system is investigated.