Composite column with ultra-short studs and double-layer high-strength spiral stirrups and construction method

Abstract

The invention discloses a composite column with ultra-short studs and double-layer high-strength spiral stirrups. The composite column with the ultra-short studs and the double-layer high-strength spiral stirrups is composed of a prefabricated ultra-high-performance concrete shell and cast-in-place concrete, the prefabricated ultra-high-performance concrete shell is of a long and straight hollow structure formed by pouring ultra-high-performance concrete, high-strength section steel is arranged in the interior of the prefabricated ultra-high-performance concrete shell in the length direction, the plurality of ultra-short studs are distributed on the outer sides of flanges of the high-strength section steel in the length direction, the adjacent flanges of the high-strength section steel are connected through riffled steel plates in the length direction, the ultra-short studs are located in the ultra-high-performance concrete, a plurality of longitudinal bars which are arranged in the length direction, inner layer high-strength spiral stirrups which wind around the inner sides of the longitudinal bars and outer layer high-strength spiral stirrups which wind around the outer sides of the longitudinal bars are further arranged in the ultra-high-performance concrete, and the cast-in-place concrete is poured into a hollow part of the prefabricated ultra-high-performance concrete shell. The invention further provides a construction method of the composite column. According to the composite column, the anti-seismic performance and fire-resistant performance are excellent, the prefabricated part is convenient to transport and hoist, the construction quality is good, the design is flexible, the concrete can be used in a differentiated mode, and the cost is low.

Description

Technical field [0001] The present invention belongs to the field of building technology, and in particular, the present invention relates to a laminated column and construction method with ultra-short pins and double-layer high-strength spiral holes. Background technique [0002] A large number of related research and engineering practices at home and abroad showed that the cross-sectional form of steel concrete structures was complex and the node is intensive, which leads to many live construction steps, long construction period, and high construction costs. [0003] The full prefabricated steel concrete structure can better make up for some of the steel concrete in construction, but due to the cross section and self-weight of the steel concrete components, there is a high transportation and on-site hoisting connection difficulty; at the same time pre-installed steel concrete In addition to reinforcing bars in the structure, steel is required to be well connected, and the concr...

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Problems solved by technology

[0005] However, on the one hand, the dense microstructure of reactive powder concrete will hinder the migration of internal water vapor at high temperatures, and the performance of reactive powder concrete under fire, especially high-temperature bursting and deterioration of mechanical strength, will greatly weaken the performance of the structure. damage or even collapse; on the other hand, the material mechanical properties of steel will be severely degraded under fire, especially the degradation of high-strength steel is more obvious

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