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Steel pipe high-elongation fiber concrete combined column

A fiber reinforced concrete, high ductility technology, applied in the direction of columns, piers, pillars, etc., can solve the decline of bearing capacity, stiffness and ductility of CFST columns, affect the integrity and stability, tensile, shear and ductility of CFST columns. Problems such as low flexural strength, to achieve the effect of increasing overall performance and ductility, high durability, and improving overall performance and ductility

Active Publication Date: 2014-12-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Concrete-filled steel tube columns are widely used in large-scale industrial buildings and high-rise and super-high-rise civil buildings in my country. However, due to the brittleness of the concrete material itself, its tensile, shear and flexural strengths are low, and the bond between the steel pipe and the Poor performance affects the integrity and stability of CFST columns to a certain extent, which is unfavorable to the seismic resistance of the structure and difficult to repair after the earthquake
When high-strength concrete is used, if the steel tubes do not constrain the concrete enough, shear brittle failure will easily occur, resulting in the CFST columns failing to give full play to the mechanical properties of steel and high-strength concrete, and even causing the bearing capacity of CFST columns to decrease. Decreased stiffness and ductility
Therefore, the existing CFST columns cannot give full play to the high compressive strength and excellent mechanical properties of steel pipes, which limits their application in high-rise building structures and complex building structures to a certain extent.

Method used

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  • Steel pipe high-elongation fiber concrete combined column
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Embodiment 1

[0020] Follow the technical scheme of the present invention, such as figure 1 As shown, in this embodiment, steel tube 1 of the high ductility fiber reinforced concrete composite column has an outer diameter of 800 mm, a thickness of 20 mm, and a height of 4.8 m, and is made of Q345 steel. Its structure is: steel pipe 1 and high ductility fiber concrete 2 poured into the steel pipe 1 . Its specific construction process is:

[0021] Step 1, place and install the steel pipe;

[0022] Step 2: pouring high-ductility fiber concrete, and curing for 7 days to obtain the steel pipe high-ductility fiber concrete composite column of this embodiment.

[0023] The components of the high ductility fiber concrete in this embodiment are cement, fly ash, silica fume, sand, PVA fiber, water reducing agent and water, wherein, by mass percentage, cement: fly ash: silica fume: sand : Water = 1: 0.9: 0.1: 0.76: 0.58; based on the total volume of cement, fly ash, silica fume, sand and water mixe...

Embodiment 2

[0031] In this embodiment, steel pipe 1 of steel pipe high ductility fiber concrete composite column has a section size of 500mm×500mm, a thickness of 20mm, and a height of 4.2m; Q345 steel is used, and other construction procedures are the same as in Embodiment 1.

[0032] The above mechanical properties of the high ductility fiber concrete in the above embodiments show that the concrete made of high ductility fiber concrete has high strength and high ductility, and is not prone to brittle failure. It can be poured into a steel tube high ductility concrete composite column, which can make full use of the mechanical properties of the steel tube and high ductility fiber concrete, thereby improving the overall performance, crack resistance and earthquake resistance of the steel tube concrete column. At the same time, the good durability of high ductility fiber concrete is used to prolong the service life of the structure and reduce costs.

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Abstract

The invention discloses a steel pipe high-elongation fiber concrete combined column so as to solve the problem that the conventional steel pipe concrete column has low integrity and stability because of brittleness, low tensile resistance, low shear resistance and low bending strength of a concrete material and low adhesion performance between the concrete material and the steel pipe. The steel pipe high-elongation fiber concrete combined column consists of a steel pipe and high-elongation fiber concrete which is poured inside the steel pipe. The elongation, integrity, seismic resistance, crack resistance and the adhesion performance between the concrete and the steel pipe in the steel pipe high-elongation fiber concrete combined column are superior to those of the traditional steel pipe concrete column.

Description

technical field [0001] The invention relates to a steel pipe concrete column in buildings, in particular to a steel pipe high ductility fiber concrete composite column. Background technique [0002] Concrete-filled steel tube columns are widely used in large-scale industrial buildings and high-rise and super-high-rise civil buildings in my country. However, due to the brittleness of the concrete material itself, its tensile, shear and flexural strengths are low, and the bond between the steel pipe and the Poor performance will affect the integrity and stability of CFST columns to a certain extent, which is unfavorable to the earthquake resistance of the structure, and it is difficult to repair after the earthquake. When high-strength concrete is used, if the steel tubes do not constrain the concrete enough, shear brittle failure will easily occur, resulting in the CFST columns failing to give full play to the advantages of the mechanical properties of steel and high-strength ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/34C04B28/04
Inventor 邓明科梁兴文樊鑫淼
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY