NONLINEAR CHARACTERISTIC ANALYSIS OF BLASTING VIBRATION SIGNALS IN THE DEMOLITION OF URBAN VIADUCTS

To study the dynamic mechanism of the blasting vibration response of viaduct demolition and analyze the dynamic factors of the time series of blasting vibration and collapse vibration, the phase space of the time series of blasting vibration response was reconstructed, and the chaotic characteristics of the vibration response signal of viaduct demolition were analyzed through the calculation of core parameters such as the attractor, Lyapunov index, correlation dimension, Kolmogoro entropy. The phase space reconstruction of vibration response signal under the action of blasting seismic waves and collapse shock has a strange attractor, and the Lyapunov index and Kolmogoro entropy are greater than 0. The result shows that the vibration signal of viaduct demolition blasting has typical chaotic characteristics, which lays a theoretical foundation for the introduction of the chaos nonlinear theory into the field of the damage effect analysis of blasting vibration.