Hollow interlayer steel tube concrete column base joint

Abstract

The invention discloses a hollow interlayer steel tube concrete column base joint, and relates to the technical field of building and bridge engineering. Concrete is filled between an outer steel tube and an inner steel tube, so that a hollow interlayer concrete column is formed; the hollow interlayer concrete column is inserted into a foundation platform; the bottoms of the steel tubes are connected with a base board; rib plates are connected with the outer steel tube and the base board and are distributed on the periphery of the outer steel tube; a close plate is connected with the inner wall of the bottom of the inner steel tube; outer foundation bolts penetrate through an extend-out punching position of the base board and are distributed among the rib plates; the bottoms of the outer foundation bolts are bent outward; bottoms of inner outer foundation bolts are bent inward. The hollow interlayer steel tube concrete column base joint has the advantages that the foundation bolts are arranged inside and outside a column base, force at the upper part of a structure can be uniformly transferred to a foundation, and the phenomenon of stress concentration is avoided; the center of the base board is hollowed, so that a space for welding of the base board and the inner steel tube is formed; axial force transferred from the upper part of a column is directly transferred to the foundation through the base board, and a bending moment is transferred to the foundation platform through the base board and the foundation bolts; the combined action of the inner foundation bolts and the outer foundation bolts has good pulling resistance effect and shearing resistance effect.

Description

Technical field [0001] The invention relates to the technical field of construction and bridge engineering, in particular to a novel hollow sandwich steel tube concrete column foot joint. Background technique [0002] Hollow sandwich steel tube concrete is a new type of steel-concrete composite structure proposed on the basis of steel tube concrete. Its cross-sectional form is formed by pouring concrete in the sandwich between two layers of concentric steel tubes, leaving space inside the inner steel tube . In recent years, it has been popularized and applied in engineering. In addition to the advantages of solid concrete filled steel tube with high bearing capacity and good plasticity, it also has the characteristics of light weight, good earthquake resistance and high rigidity. This makes the hollow sandwich steel tube concrete have great advantages in the applications of high bridge piers, high-rise building vertical members, offshore platform supports, etc. [0003] The colum...

AI Technical Summary

Problems solved by technology

Since the stiffness of the exposed joint only depends on the action of the anchor bolts, once the anchor bolts yield, the stiffness of the joint will decrease rapidly, unless a large number of anchor bolts and a sufficiently thick foot plate are used, which will greatly increase the construction time and cost; for embedded column foot joints, the stiffness of the joints will increase with the increase of the buried depth. Although this design can release the high stress on the anchor bolts, it will produce a concentration on the concrete contact between the joint and the foundation Stress, especially for piers with large height-to-width ratio or tall bridge piers, the shear and pull-out bearing capacity may be insufficient

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