Concrete-filled steel tubes are concrete poured into steel tubes and compacted to increase the strength and stiffness of the tubes. In general, we call Concrete Filled-Filled Concrete (CFST) with a concrete strength rating below C50 as ordinary CFST; concrete-filled CFST (Concrete-Structured Concrete-Filled Steel Tube) is known as high-strength steel-concrete-concrete; concrete-strength-graded CFST (C100) or more is known as CFRP (Ultra High-Strength Concrete). .
Concrete-filled steel tube refers to the structural members that are formed by filling concrete in steel tubes and the steel tubes and their core concrete can jointly bear external loads. According to different cross sections, they can be divided into round steel tube concrete, square, rectangular steel tube concrete and polygonal steel tube concrete, etc. .
In the concrete-filled steel tube column, the confinement effect of the steel tube on its internal concrete makes the concrete in the three-direction compressive state, which improves the compressive strength of the concrete. The concrete inside the steel tube can effectively prevent local buckling of the steel tube. Studies have shown that the bearing capacity of concrete-filled steel tubular columns is higher than the sum of the corresponding bearing capacity of steel tubular columns and the bearing capacity of concrete columns. The interaction between the steel pipe and the concrete causes the failure of the concrete inside the steel pipe to change from brittle failure to plastic failure. The ductility of the component is obviously improved, the energy dissipation capacity is greatly improved, and the seismic performance is superior.
Plasticity refers to the plastic deformation ability under static load. The axial compression test of the short column of concrete-filled steel tube shows that when the specimen is compressed to 2/3 of the original length and the longitudinal strain is more than 30%, the specimen still has bearing capacity. After peeling off the steel pipe, although the internal concrete has a large bulge and fold, it remains intact, not loose, and still has about 5% of the bearing capacity. It is crushed and shed after being hammered with a hammer. Seismic performance refers to good ductility and energy absorption under dynamic load or earthquake. In this regard, concrete-filled steel tubular members are much stronger than reinforced concrete members. The hysteresis curve of bending moment curvature under cyclic bending loads indicates that the energy absorption performance of the structure is particularly good, no stiffness is degraded, and there is no falling section, which is the same as the steel column without losing local stability, but in some buildings, Steel columns often use very thick steel plates to ensure local stability. However, local stability is also lost after plastic bending. Therefore, the seismic behavior of concrete-filled steel tubular columns is also superior to that of steel columns.
Concrete-filled steel tube refers to the structural members that are formed by filling concrete in steel tubes and the steel tubes and their core concrete can jointly bear external loads. According to different cross sections, they can be divided into round steel tube concrete, square, rectangular steel tube concrete and polygonal steel tube concrete, etc. .
In the concrete-filled steel tube column, the confinement effect of the steel tube on its internal concrete makes the concrete in the three-direction compressive state, which improves the compressive strength of the concrete. The concrete inside the steel tube can effectively prevent local buckling of the steel tube. Studies have shown that the bearing capacity of concrete-filled steel tubular columns is higher than the sum of the corresponding bearing capacity of steel tubular columns and the bearing capacity of concrete columns. The interaction between the steel pipe and the concrete causes the failure of the concrete inside the steel pipe to change from brittle failure to plastic failure. The ductility of the component is obviously improved, the energy dissipation capacity is greatly improved, and the seismic performance is superior.
Plasticity refers to the plastic deformation ability under static load. The axial compression test of the short column of concrete-filled steel tube shows that when the specimen is compressed to 2/3 of the original length and the longitudinal strain is more than 30%, the specimen still has bearing capacity. After peeling off the steel pipe, although the internal concrete has a large bulge and fold, it remains intact, not loose, and still has about 5% of the bearing capacity. It is crushed and shed after being hammered with a hammer. Seismic performance refers to good ductility and energy absorption under dynamic load or earthquake. In this regard, concrete-filled steel tubular members are much stronger than reinforced concrete members. The hysteresis curve of bending moment curvature under cyclic bending loads indicates that the energy absorption performance of the structure is particularly good, no stiffness is degraded, and there is no falling section, which is the same as the steel column without losing local stability, but in some buildings, Steel columns often use very thick steel plates to ensure local stability. However, local stability is also lost after plastic bending. Therefore, the seismic behavior of concrete-filled steel tubular columns is also superior to that of steel columns.
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