城市高架桥拆除爆破振动信号的非线性特征分析

为研究高架桥拆除爆破振动响应动力学机制，分析爆破振动、塌落振动时间序列的动力学因素，将拆除爆破振动响应时间序列进行相空间重构，通过吸引子、Lyapunov指数、关联维数、Kolmogoro熵等核心参量计算，分析高架桥拆除爆破振动响应信号混沌特征。经过计算，爆破振动及桥体塌落冲击作用下振动响应信号相空间重构后具有奇怪吸引子，且Lyapunov指数、Kolmogoro熵均大于0。研究表明：高架桥拆除爆破振动信号具有典型的混沌特征，为混沌非线性理论引入爆破振动危害效应分析领域奠定了理论基础。

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.