Complexity Theory Analysis of Bridge Structure System

This paper explores the complexity of the bridge structure system, and proposes definition of bridge structure system's complexity and theoretical research methods about characteristics of bridge structure system's complexity. The features of bridge structure system's complexity include: openness, giant, emergence, uncertainty, hierarchy. And bridge structure has nonlinear complexity, such as dissipation, chaos, and fractal. Thus, a state evolution model for bridge structure system can be established through dimensionality reduction, entropy reduction, chaotic bifurcation, self-similarity dimension, solitary, then implementing assessment of in-service bridges' condition based on Complex System theory.