Influence of shaft on wind-induced response of super-long span transmission tower
The numerical simulation method was used to study the influence of the shaft on the wind-induced response of the super-long span transmission tower.The equivalent modeling method of the concrete-filled steel tube rod using the steel tube rod was proposed.The time domain and frequency domain methods were used to study the wind-induced response of the transmission tower with or without wellbore in the direction of the line and the transverse line.Finally,the wind vibration coefficient results were compared with the specified values in the specification.The research shows that it is feasible to use the equivalent principle of section stiffness to equivalent the concrete filled steel tube rod to the steel tube rod.Considering that the first two natural frequencies of the transmission tower after the shaft are significantly reduced,the displacement and acceleration of the transmission tower are increased.The calculation results of time domain method and frequency domain method are close.The overall wind vibration coefficient of the transmission tower with shaft is 11％～15％larger than that of the transmission tower without shaft.The calculation results of the wind vibration coefficient are close to the specified values of the Load code for the design of overhead transmission line(DL/T 5551-2018).
super-long span transmission towershaftwind-induced responsefinite element methodtime domain method
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