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Double-layer channel-recycled concrete composite beam

A technology of recycled concrete and composite beams, applied in the field of composite beams, can solve the problems of incomplete bending resistance of section steel, unfavorable factory mechanized production, low production efficiency, etc., and achieve the effects of improving space utilization, light weight and convenient construction

Inactive Publication Date: 2017-09-19
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing steel-concrete composite beam is to bury the section steel in the concrete. To prevent the flange of the section steel from buckling outwards and cause the concrete on the outside of the flange to crack, a certain thickness of concrete protective layer is required, which will cause the bending resistance of the section steel to be incomplete. , the concrete in the tension area does not play a role but increases the self-weight of the component; the concrete used is mostly reinforced concrete, although reinforced concrete can effectively restrain the joint action of steel and concrete, but most of the binding steel bars are manually bound, and the production efficiency Low, not conducive to factory mechanized production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The weight ratio of each component in Example 1 is: water: cement: sand: discarded bricks: discarded concrete blocks=1:2.27:2.27:1.04:5.21. Standard methods were used for testing, and the experimental data were as follows: slump was 180, excellent workability, 7-day compressive strength 28.5MPa, 28-day compressive strength 43.5MPa.

[0019] 1. Determine the preparation strength f cu,0

[0020] f cu.0 = F cu,k +1.645σ

[0021] When the strength grade of concrete is C35, σ=5.0MPa, then

[0022] f cu,0 =48.2MPa

[0023] 2. Preliminarily determine the water-cement ratio W:C

[0024] Because the 28d measured strength of the cement used in this experiment is f ce Unknown, it is expected that the measured strength of cement at 28d can reach 48.0MPa. Coarse aggregate is crushed stone, A=0.46, B=0.07

[0025]

[0026] 3. Preliminary estimation of unit water consumption

[0027] The maximum particle size is 40mm. Because the waste concrete blocks are subjected to a large external force d...

Embodiment 2～5

[0042] In Examples 2 to 5, the related process refers to Example 1, and the relevant parameters are adjusted to obtain the following ratios:

Embodiment 2

[0043] The weight ratio of each component in Example 2 is: water: cement: sand: discarded bricks: discarded concrete blocks=1:2.11::2.48:1.15:5.25. Standard methods were used for testing, and the experimental data are as follows: slump is 160, excellent workability, 7-day compressive strength 22.5MPa, 28-day compressive strength 45MPa.

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Abstract

The invention discloses a duplex channel steel and recycled concrete combination beam, comprising first channel steel and second channel steel riveted to the first channel steel. Shear-resistant connectors are disposed at the bottom of the first channel steel. The first channel steel is filled with recycled aggregate concrete. The second channel steel is fixedly connected through rivets. The thickness of a web of the second channel steel is greater than that of a web of the first channel steel. A replacement rate of recycled aggregate in the recycled aggregate concrete is 50%. In the combination beam, the lower channel steel is provided for bearing tension, the concrete in the upper channel steel is provided for bearing pressure, respective performances of the upper and lower channel steel can be given to full play, and bending resistance of the combination beam is higher; under same performances, the combination beam is lighter in weight and the seismic capacity is favorably improved; braces and form boards for use in a construction phase can be reduced, and construction is greatly facilitated; the lower channel steel gives full play to the tensile strength, the building structure is simplified, fewer rebars are tied, and construction efficiency is improved.

Description

Technical field [0001] The invention belongs to the field of building structures, in particular to a composite beam. Background technique [0002] With the progress of urbanization in China, the problem of construction waste (waste) has gradually been paid attention to. If a simple stacking method is adopted, the new construction waste treatment will occupy at least 150 million square meters each year. As a new material, recycled concrete can solve this problem well. [0003] With the development of social economy and building structure, there are more and more applications of steel-concrete composite structures. Steel-concrete composite structures give full play to the mechanical properties of concrete under pressure and steel under tension. The application of steel can reduce concrete structures. The excessively large cross-section can reduce the weight and improve the seismic performance. [0004] The existing steel-concrete composite beams embed the steel in the concrete. To p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/293C04B28/02C04B14/06C04B18/16
CPCY02W30/91
Inventor 伍凯桑胜涛曹平周南洋张贺
Owner HOHAI UNIV
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