Dynamic Response of a QLY Tower Crane under Pulsating Wind Loads in the Wind Direction

Abstract

This study investigates the dynamic response of the QLY tower crane under pulsating wind loads. An autoregressive model was employed to simulate pulsating wind speeds. A finite element model of the entire crane was established and subjected to modal analysis, determining its fundamental structural period to be 2.77 seconds. Transient dynamic analysis at four working radii revealed: - The middle boom section exhibited the most sensitive response. - Pulsating wind loads significantly amplified dynamic responses compared to static wind loads, with displacement errors exceeding 178% at specific nodes. - Stress fluctuations were severe during short-radius operations, while long-radius operations primarily exhibited low-frequency vibrations. Results indicate static analysis severely underestimates actual wind-induced vibrations. It is recommended to implement vibration reduction measures in flexible regions of the boom and tower to enhance safety.