Research Of Existing Bridge Structure Status Monitoring Methods Based On Complex System Theory

With Bridge Structural Health Monitoring technology widely used,analysis of the structure state based on existing bridge structure dynamic response theory and technical has benn widely applied.In this paper,exploring the bridge structure characteristics of complex systems in service combining the theory of complex systems,and focusing on the analysis of nonlinear complex system dynamic behavior and its generating mechanism and evolution mode,forming the research of existing bridge structure status monitoring methods based on the theory of complex system.and Combining with the scale model test and ASCE Benchmark structure model validation.Main contents of this paper include:?Exploring the existing bridge structure complex systems characteristics and the complex systems dynamic behavior.Analyzing the characteristic of the bridge structure of complex systems based on the bridge structural system elements,functional,environmental and other factors.Combined with nonlinear properties of the bridge structure and nonlinear restoring force vibration model and analysis the bridge structure complex systems dynamic behavior mechanism.With single degree of freedom of duffing equation,two degrees of freedom with a square nonlinear Hamiltonian system as an example,further analysis of the structure system nonlinear chaotic dynamic behavior evolution mode and analysis of bridge structure systems dissipative,fractals,soliton complex system dynamics behavior and so on.?Study the existing bridge structure complex systems dynamic behavior evolution model.Introdcing the nonlinear complex systems dynamics theory,combined with the non-linear restoring force with structure damage evolution of a single degree of freedom structure vibrating beam model,simulating the structural damage evolution,and analysis of Phase Space,Lyapunov Exponent,Poincare Section Radius R of complex system dynamics behavioral characteristics indexs to characterize of the structure state evolution model.?Study the existing bridge structure complex systems dynamic behavior evolution model based on scale model.By obtaining scale model No.1,7,10 measuring point acceleration response signal time series,using the Fast Fourier Transform,Phase Space Reconstruction,C-Cmethod,maximum Lyapunov exponent extracted Wolf method.Analysis of the structure Non-destructive and with the crack occurrence and development four different degrees of damage cases.In the percussion and axle vibration coupling and extracted complex systems dynamic behavior cycle,Time Delay,Embedding Dimension,Largest Lyapunov Exponent,Poincare Section Radius R characteristic indicators and analyzing the characteristics indicators to assess structure state evolution patterns.?Study the complex systems dynamical behavior model evolution based on ASCE Benchmark structure model.Select ASCE Benchmark structure model of five kinds of the operation condition of the damage degree increased gradually,obtaining the No.6,9,12,15 measuring point's dynamic response acceleration time series signals,and extraction five indicators to verify the validity and sensitivity of each index,forming a multi-dynamic behavior of complex systems characterized indicators and collaborative to assess existing bridge structure state evolution model.