Research Of Applicable And Durable Configurations Of Concrete Bridge

Configurations played important roles in durability and mechanical performance of concrete bridges, but had not been taken sufficiently. Supported by the science and technology project of ministry of communication, several key configurations of concrete bridges in this paper had been studied, the main contents were as follows:1. Based on the impacts of service performance and durability of concrete bridges by configurations, the concept "applicable and durable configuration" was proposed, the meaning and impact factors of it were analysised. The proportions of main structures and weights of impact factors were analyzed by using AHP. The research methodology of applicable and durable configuration was also proposed, which laid a foundation of study of applicable and durable configurations of concrete bridge.2. The thickness of reinforcement covers were researched from three aspects:based on the autogenous shrinkage of concrete during condensation and hardening, corrosion of reinforcements caused by carbonization, corrosion of reinforcements caused by chloride. Compared with thickness of cover in criterions of bridge and concrete structure, the minimum thickness of reinforcement cover and the minimum strength of concrete on the specific design reference period were recommended.3. Based on the theory research and numerical analysis, the configurations of diaphragm plate of T beam and connection configurations of diaphragm plate were studied. The suitable construction size and the connection configurations of diaphragm plate were determined, and the applicability and durability of these configurations were also verified.4. Based on the theory research and numerical analysis, the configurations and reinforcement arrangements of bridge deck of concrete T beam were studied. The suitable width and thickness of bridge decks and the appropriate diameter and spacing of reinforcements were determined, and the applicability and durability of these configurations were also verified.5. Based on the experiments of hinge joints under static and fatigue loads, the mechanisms of hinge joints damage were analysised, the effects on the hinge joints performance by fatigue loading were definited. Based on the comparison and analysis of measurement data through the grating, the resistance strain gage and the numerical results, the validity of Fiber Bragg Grating Strain measuring device were verified, strain measurement methods and means of detailed configuration of the concrete bridge were innovated. 6. Combined with hinge joints experiments, through numerical analysis, the integral mechanical behaviors of hinged plates and stress performances in hinge joints were studied, which were impacted by depth of hinge joints and thickness of concrete deck pavement. The reason of hinge joints destroy was definited, the applicable and durable configurations of hinged plate bridges were proposed.7. Based on the research and summary of applicability and durability of the main configurations of concrete bridge, the design principles and main contents of applicable and durable configurations of concrete bridge were proposed, which laid a foundation of design manual compilation of applicable and durable configurations of concrete bridge.