Assembly type multicavity concrete-filled steel tubular member and preparation method thereof

Abstract

The invention discloses an assembly type multicavity concrete-filled steel tubular member and a preparation method thereof. The assembly type multicavity concrete-filled steel tubular member comprisesan inner steel tube and concrete, wherein a plurality of stiffening rib steel plates are fixedly connected to the outer wall of the inner steel tube around the axis of the inner steel tube, connecting steel plates which are arranged in the radial direction of the inner steel tube are fixedly connected to the stiffening rib steel plate respectively, the adjacent connecting steel plates are connected by virtue of channel steel which is fixedly connected to the outer ends of the connecting steel plates, side legs of the channel steel are butted with the side surfaces of the connecting steel plates in parallel, the stiffening rib steel plates, the connecting steel plates and the channel steel are arranged along the full length of the axis of the inner steel tube, and the concrete is poured into a cavity enclosed by the inner steel tube, the connecting steel plates and the channel steel. According to the assembly type multicavity concrete-filled steel tubular member, the cross section is unfolded, the flexural rigidity is large in the condition of the same self weight, and therefore, the mechanical properties of materials can be preferably played in the condition of large bending moment; the assembly type multicavity concrete-filled steel tubular member has the advantages of high bearing capacity, good plasticity, toughness and fire resistance, easiness in manufacturing, convenience in transportation and less construction process, the construction speed is increased, and the economic benefits are increased.

Description

technical field [0001] The invention relates to the technical field of building structural components, in particular to an assembled multi-cavity steel pipe concrete component and a preparation method thereof. Background technique [0002] Concrete-filled steel pipe refers to the structural member formed by filling concrete in the steel pipe, and the steel pipe and its core concrete can bear the external load together. . Concrete is known to have high compressive strength. However, the bending resistance is very weak, while steel, especially section steel, has strong bending resistance and good elastic-plasticity, but it is easy to lose stability and lose axial compression resistance when it is compressed. Concrete-filled steel pipe can combine the advantages of the two in structure, which can make the concrete in a state of lateral compression, and its compressive strength can be doubled. At the same time, due to the existence of concrete, the rigidity of the steel pipe i...

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Problems solved by technology

[0004] 1. Reinforced concrete columns or reinforced concrete piers are self-heavy, resulting in poor seismic performance, high foundation cost, and poor shear resistance, resulting in shear failure prior to ductile bending failure, resulting in brittle failure of the column or pier

[0005] 2. The traditional steel pipe concrete is heavy, the foundation cost is high, and the flexural bearing capacity is insufficient. Under the action of axial load, the steel pipe and the core concrete bear the longitudinal load at the same time, and the restraining effect of the steel pipe on the core concrete has not been fully exerted. The core concrete In the process of stress, it is easy to produce shear crushing failure

[0006] 3. Ordinary hollow interlayer concrete-filled steel tubes overcome the shortcomings of ordinary concrete-filled steel tubes, such as self-heavy weight and insufficient flexural bearing capacity, but due to the circumferential tension generated by the core concrete expansion on the inner steel tubes, the inner steel tubes are prone to local buckling, resulting in Void between the core concrete

[0007] 4. Ordinary hollow interlayer concrete-filled steel tubes have weak restraint on the core concrete. Most of the core concrete cannot be under three-dimensional compression, and the concrete often suffers from brittle failure, which makes its components unable to fully utilize the combination of the two. effect, which further leads to the reduction of its bearing capacity, ductility and plastic deformation capacity, and the energy dissipation capacity of ordinary hollow sandwich concrete-filled steel tube concrete is poor, which leads to the poor seismic capacity of ordinary hollow sandwich sandwich concrete-filled steel tube components

[0008] 5. In the existing steel pipe concrete, the steel pipes have weak binding ability to the core concrete, and cannot give full play to the performance of the concrete itself. Concrete-filled steel tubes are difficult to transport and construction is difficult, resulting in slow construction speed and affecting economic benefits

[0009] 6. The cross-section of the existing steel pipe concrete is fixed than the rule, which is not suitable for some large-scale and complex structures such as large-span space structures, super high-rise buildings, and super-large bridges, thus limiting the use of such components

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