Steel-ECC-concrete composite beam and preparation method thereof

Abstract

The invention discloses a steel-ECC-composite composite beam and a preparation method thereof, and belongs to the field of building structures. The steel-ECC-concrete composite beam includes steel beams, at least two sets of shear key sets, ECC protection blocks, and concrete slabs with internal reinforcement. All shear key sets and ECC protection blocks are arranged on the top surfaces of the steel beams, each of the ECC protection blocks is wrapped with a set of shear key set, each of the shear key sets includes a plurality of spaced shear keys; the cross section of each ECC protection blockis rectangular, and the width of the outer contour of the bottom is equal to the width of the top surface of the steel beam. The width direction is parallel to the width direction of the steel beams,all ECC protection blocks are distributed in the axial direction of the steel beams, and a first groove is formed between adjacent ECC protection blocks and the top surfaces of the steel beams; between adjacent ECC protection blocks, a reinforcing mesh is arranged, and the reinforcing mesh penetrates through the first groove; the surfaces of the ECC protective blocks, not in contact with the topsurfaces of the steel beams, are provided with an adhesive layer, and the concrete plate is provided with a convexity matched with the first groove and a second groove matched with the ECC protectionblocks.

Description

technical field [0001] The invention relates to the technical field of building structures, in particular to a steel-ECC-concrete composite beam and a preparation method thereof. Background technique [0002] When the steel-concrete composite structure is used as a beam, it can give full play to the tensile performance of steel and the compressive performance of concrete. In the past design, the structural form of the steel-concrete composite beam is generally composed of the upper concrete slab and the lower steel beam, and the concrete slab and the steel beam are usually connected by shear keys. If the concrete construction and maintenance are unfavorable, it is easy to produce too many defects and cracks; at the same time, vibration loads, etc., will also cause reverse loads on the beams, and the originally compressed concrete is also prone to cracks under tension. These factors will lead to excessive cracks in the concrete, which will affect the performance of the shear...

AI Technical Summary

Problems solved by technology

If the concrete construction and maintenance are unfavorable, it is easy to produce too many defects and cracks; at the same time, vibration loads, etc., will also cause reverse loads on the beam, and the originally compressed concrete is also prone to cracks under tension.

These factors will lead to excessive cracks in the concrete, which will affect the performance of the shear key, causing the shear key to fail early, resulting in a decrease in the overall stiffness of the structure, a decrease in the ultimate bearing capacity, and a decrease in life.

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