Fiber reinforce plastic (FRP)-rubber-steel composite pipe concrete structure

Abstract

The invention discloses a fiber reinforce plastic (FRP)-rubber-steel composite pipe concrete structure. The structure is characterized by comprising an FRP layer (1), a rubber layer (2), a steel pipe (3) and core concrete (4) from outside to inside, wherein the FRP layer (1), the rubber layer (2) and the steel pipe (3) are stuck by resins to form an integral composite pipe; the core concrete (4) is filled in the composite pipe; and the composite pipe applies constraint enhancement effect on the internal core concrete (4). The invention overcomes the defects of the known steel pipe concrete and FRP pipe concrete structure, has the advantages of large bearing capability, high ductility, devisable yield platform and post-yield enhanced secondary rigidity, large bearing capability reserve, high damping performance and high durability, particularly has perfect earthquake resistance and good capability of absorbing vibration load energy under seldom occurred earthquakes, and can be applied as components of columns, piers and the like in the field of civil construction structure.

Description

technical field [0001] The invention relates to a concrete structure, in particular to a composite tubular concrete structure, which belongs to the technical field of civil engineering structures. Background technique [0002] The traditional steel pipe concrete structure has the advantages of convenient construction, good energy dissipation performance, and high rigidity. Under the constraints of steel pipes, the core concrete has greatly improved bearing capacity and deformation capacity, especially its good ductility. Applied to high-rise, long-span and bridge structures. However, due to the elastic-plastic stress-strain relationship of steel, once the steel pipe yields, its restraint force will be limited to a fixed value, and the restraint effect on concrete will no longer increase, and the strength of the steel pipe is low. For large concrete structures with high axial force, it is necessary to use Thick-walled steel pipes use a large amount of steel. In addition, ste...

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Problems solved by technology

Under the action of rare earthquakes, the ordinary concrete-filled steel tube structure will inevitably enter the plastic stage, the secondary stiffness after yielding is close to zero, and the bearing capacity reserve is low; although the FRP tube concrete structure has a strengthened stress-strain relationship, it will fail The model is brittle and the residual bearing capacity is low; simply wrapping FRP around the steel pipe to form composite tubular concrete, due to the low ultimate strain capacity of FRP, the FRP will break shortly after the steel pipe yields, which cannot meet the requirements of the current seismic code in my country The purpose of "multi-level fortification" and performance-based design, what's more, in the traditional view, FRP is used to apply prestress to restrain concrete columns, which will lead to the destruction of FRP and reduce the ductility of the structure

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