Method for determining inherent frequency of reinforced concrete-steel combined fan tower frame

The invention discloses a method for determining the inherent frequency of a reinforced concrete-steel combined fan tower frame. The method comprises the steps that 1, the bottom cylinder wall outer circle radius r1, the top cylinder wall outer circle radius r2 and the total height h1 of a reinforced concrete tower frame are determined; 2, the bottom cylinder wall outer circle radius r3, the top cylinder wall outer circle radius r4 and the total height h2 of a steel tower frame are determined; 3, the equivalent wall thickness t of the tower frame or the equivalent wall thickness t1 of the reinforced concrete tower frame and the equivalent wall thickness t2 of the steel tower frame are calculated; 4, the total mass m of fan equipment on the top of the combined fan tower frame is determined;5, when the reinforced concrete tower frame is made of reinforced concrete, the elasticity modulus of the material is determined as Ec, and when the steel tower frame is made of steel, the elasticitymodulus of the material i