Unequal-strength beam-column joint based on steel plate hoop confined concrete laminated short columns

Abstract

The invention provides an unequal-strength beam-column joint based on steel plate hoop confined concrete laminated short columns. The unequal-strength beam-column joint comprises column longitudinal bars, column combined stirrups, first-strength-grade concrete, second-strength-grade concrete, steel plate hoops and short longitudinal bars. The node core area is poured by adopting low concrete which is the same as the beam plate, a steel plate hoop confined concrete laminated short column is arranged in the node core area, and the steel plate hoop confined concrete laminated short column is provided with a steel plate rib and a short longitudinal rib. The unequal-strength beam-column joint based on the steel plate hoop confined concrete composite short column is high in construction efficiency, small in construction difficulty and good in anti-seismic property.

Description

technical field [0001] The invention relates to a unequal-strength concrete beam-column joint, in particular to a unequal-strength concrete beam-column joint with a steel plate hoop constrained concrete laminated short column inside. Background technique [0002] For existing building construction projects, the design often reduces the cross-sectional area of ​​the column as much as possible. Because the column bears the vertical load transmitted from the upper multi-storey building, its concrete strength is generally relatively high. High-strength concrete is prone to dry shrinkage cracks, which affect the quality. In addition, because it only bears the load of this layer and considers the seismic effect of "strong columns and weak beams", the strength of concrete is relatively low. [0003] In this way, beams and columns often use concrete of different strength grades in structural design. In actual engineering, the strength of column concrete is generally higher than that...

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Problems solved by technology

[0004] This construction method is not ideal, and has the following problems: commercial concrete is commonly used at present, and its slump is relatively large. If no formwork is set at the interface and it is allowed to flow naturally, it will make it flow outward for a long distance, and the joints The high-strength concrete poured and tamped first will make it longer, which will form a construction joint that is not easy to handle at the beam end, and insufficient vibration will cause the concrete at the joint to fail to reach the expected strength; the interface is affected The weak link of the force is located in the plastic hinge area of ​​the beam, and the shear force and bending moment are relatively large, leaving construction joints that are not easy to handle, which may affect the bearing capacity of the beam

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