Concrete Encasement Stress for Steel-reinforced Composite Structure
To make up for the blank of concrete encasement stress analysis for composite structure in the current highway or construction industry specifications,solve the cracking problem of concrete encasement in steel-reinforced concrete composite structure in the bridge engineering,and ensure the bridge structure safety and durability,the key to solve the problems is to understand the concrete encasement stress distribution rule for steel-reinforced concrete composite structure,and the influencing factors of concrete encasement maximum stress.The classical elasticity theory was used to derive the analytical expressions for stress distribution in the encased concrete with cylindrical steel tube-concrete composite structure under internal expansion or internal pressure,as well as the steel-concrete interface stress.The results were compared with the numerical analysis results,showing small errors.The finite element modeling was also used to analyze the stress distribution rule of square column steel tube-concrete composite structure under internal expansion force.The result indicates that the maximum hoop stress on the encased concrete with cylindrical steel tube-concrete composite structure appears at steel tube outer wall,decreasing as it goes outward.The hoop stress decreases with the increase of wall thickness and encased concrete thickness.It increases with the increase of encased concrete elastic modulus.Compared with cylinders,the maximum hoop stress distribution on the encased concrete with square column steel tube-concrete composite structure is more complex due to the influence of cross-sectional dimensions.When the encased concrete is thin,the hoop stress shows the nonlinear distribution.When the encased concrete is thick,the distribution is similar to that with cylindrical shape.The study result provides the reference for effectively controlling the stress on encased concrete with steel-reinforced concrete composite structure in design,avoiding the encased concrete cracking.
bridge engineeringclassical elasticityfinite element methodsteel-reinforced composite structurestressconcrete encasement
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