Large square concrete filled steel tube member with multiple cavities

Abstract

The invention relates to a large square concrete filled steel tube member with multiple cavities. The large square concrete filled steel tube member is mainly applied to a huge building, and includessquare steel tubes, connecting steel plate strips, cavity division steel plates, steel reinforcement cages, steel tie bars, studs, circumferential ribbed plates and concrete, the inner parts of the square steel tubes are divided into the multiple cavities by the cavity division steel plates, the connecting steel plate strips are arranged at the joints of the cavity division steel plates and the joints of the cavity division steel plates and the inner walls of the steel tubes, and the connecting steel plate strips are welded to the inner walls of the steel tubes and the cavity division steel plates which are in contact with the connecting steel plate strips as a whole; the steel reinforcement cages are arranged in the cavities correspondingly, the evenly distributed horizontal steel tie bars tie and fix the adjacent steel reinforcement cages, and circular holes are formed in the positions where the steel tie bars pass through the cavity division steel plates to ensure the smooth passageof the steel tie bars; the studs are evenly welded to the inner walls of steel tie plates and the square steel tubes, and the circumferential ribbed plates are additionally welded to the inner wallsof the square steel tubes every 3-5 m; and other spaces inside the square steel tubes are filled with the concrete. The member has good bonding performance, restraint effect and integrity, and hydration heat of mass concrete can be lowered.

Description

technical field [0001] The invention is a multi-cavity giant square steel pipe concrete member, which belongs to a steel-concrete composite member with improved bonding performance and restraint effect. Background technique [0002] Concrete-filled steel tube components are widely used in load-bearing components of houses, bridges, and factory buildings due to their good mechanical performance, excellent earthquake resistance and convenient construction. Then increase. A large number of studies have shown that the corners of square concrete-filled steel tubes can well restrain the concrete in the core area, but the middle part of the surrounding steel tube walls is prone to outward buckling deformation under vertical or seismic action and loses its restraining effect. Another study shows that as the size increases, the interface bonding performance between steel pipe and concrete weakens, and the bond strength of large-scale square concrete filled steel pipe concrete is far...

AI Technical Summary

Problems solved by technology

A large number of studies have shown that the corners of the square steel pipe concrete can well restrain the concrete in the core area, but the middle part of the surrounding steel pipe walls is prone to outward buckling deformation under vertical or earthquake action and loses the restraint effect.

Another study shows that as the size increases, the interface bond between steel pipe and concrete weakens, and the bond strength of large-scale square steel pipe concrete is far lower than the design recommendation value of national codes, which cannot ensure reliable shear force transmission between steel pipe and concrete

The problem of heat of hydration caused by mass concrete in giant square concrete-filled steel tube members cannot be ignored, especially in the concrete in steel tubes, the temperature cracks caused by heat of hydration are not easy to be detected, and there are potential safety hazards

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