CN115288364B - Concrete filled steel tube column with local Gao Jiangle and built-in stirrups and construction method thereof - Google Patents
Concrete filled steel tube column with local Gao Jiangle and built-in stirrups and construction method thereof Download PDFInfo
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- CN115288364B CN115288364B CN202210779954.1A CN202210779954A CN115288364B CN 115288364 B CN115288364 B CN 115288364B CN 202210779954 A CN202210779954 A CN 202210779954A CN 115288364 B CN115288364 B CN 115288364B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/32—Columns; Pillars; Struts of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
- E04C5/0609—Closed cages composed of two or more coacting cage parts, e.g. transversally hinged or nested parts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
- E04C5/0613—Closed cages made of one single bent reinforcement mat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a concrete filled steel tube column with a local Gao Jiangle and built-in stirrups and a construction method thereof. The steel pipe concrete column comprises a steel pipe, a locally high-strength rib, a built-in stirrup, core concrete and a longitudinal erection rib. Local Gao Jiangle is arranged on the outer side walls of the steel pipes at the upper end and the lower end of the column; a plurality of built-in stirrups are fixed along the length direction of the longitudinal erection ribs; a clear distance is reserved between the outer side of the built-in stirrup and the inner wall of the steel pipe, and core concrete is filled in the steel pipe; the longitudinal erection ribs and the built-in stirrups are buried in the core concrete, and the longitudinal erection ribs do not directly bear vertical loads. The high-strength ribs and the built-in stirrups of the steel pipe are arranged on the outer wall of the steel pipe locally, so that the equivalent steel distribution rate of the steel pipe at the upper end and the lower end is increased, the combined action of the high-strength ribs and the built-in stirrups is arranged on the local part to delay or improve the local bulging of the steel pipe and strengthen the constraint on core concrete, and the fire resistance and the earthquake resistance of the column are greatly improved under the condition that the total steel amount is basically the same.
Description
Technical Field
The invention belongs to the technical field of building structural members, and particularly relates to a steel tube concrete column with a local Gao Jiangle and built-in stirrups and a construction method thereof.
Background
The steel pipe concrete column has the advantages of excellent mechanical property and convenient construction, and is widely applied to engineering construction, but the steel pipe is exposed to cause poor fire resistance. Currently, it is common practice to provide steel pipe surfaces with a fire protection layer (e.g., with fire retardant paint) and built-in rebars (mainly longitudinal stressed rebars) or steel components (steel pipes, sections or cores). However, in the whole-service life process of the structural member, for the former measure, the long-term performance of the fireproof protection layer has uncertainty (for example, falling off can occur), potential safety hazards exist, and the comprehensive cost of long-term maintenance and the like is high; the latter measure increases the steel consumption and the cost, and when the partition board is arranged in the anti-seismic node, the construction of connecting the built-in steel bars or steel parts between the upper floor and the lower floor is troublesome.
Under the action of earthquake, the bending moment of the upper end and the lower end of the column is larger, and the bending moment of the column shaft is smaller. Through investigation and research of earthquake disasters, it is found that the earthquake damage of the column is generally mainly concentrated at the upper end and the lower end of the column, and the remaining part of the column shaft is basically intact, i.e. the material properties of the column shaft are not practically fully utilized. At present, in order to improve the anti-seismic performance of the steel tube concrete column, wang Mengfu and the like, a method for internally arranging a common strength reinforcing rib is proposed in an anti-seismic test study of the square steel tube concrete column with ribs at the end part, but the lifting amplitude of the steel tube concrete column to the horizontal bearing capacity is smaller, and the steel consumption is additionally increased.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provide a concrete filled steel tube column with a part provided with Gao Jiangle and built-in stirrups and a construction method thereof. On one hand, stirrups are arranged inside the steel pipe, on the other hand, high-strength ribs are locally arranged on the outer side wall of the steel pipe, the equivalent steel distribution rate of the steel pipe at the upper end and the lower end of the steel pipe concrete column is increased, local bulging of the steel pipe is delayed or improved, the constraint on core concrete is enhanced, the fire resistance of the column is greatly improved on the premise that the total steel consumption is the same, the primary fire resistance requirement (more than or equal to 180 min) can be completely achieved under some working conditions that the actual load ratio is less than 0.4, a fireproof protection layer is not needed on the surface of the steel pipe, and the shock resistance of the column is improved.
In order to achieve the purpose of the invention, the steel pipe concrete column provided with the built-in stirrups and locally provided with Gao Jiangle comprises a steel pipe, core concrete, a locally provided high-strength rib, built-in stirrups and a longitudinal erection rib; a local part Gao Jiangle is arranged on the outer side wall of the upper end and the outer side wall of the lower end of the steel pipe; the height of the locally arranged high-strength rib is 0.80B-1.25B, when the section of the steel pipe concrete column is square, B is the side length of the section of the steel pipe concrete column, and when the section of the steel pipe concrete column is circular, B is the diameter of the section of the steel pipe concrete column; the local high-strength rib is formed by a high-strength steel plate with the mark not lower than Q420; a plurality of built-in stirrups are fixed along the length direction of the longitudinal erection ribs; a certain clear distance is reserved between the outer side of the built-in stirrups and the inner wall of the steel pipe, and a plurality of built-in stirrups are arranged at preset intervals by adopting a circular parallel hoops or alternatively arranged at preset intervals by adopting circular parallel hoops and single circular stirrups or alternatively arranged at preset intervals by adopting single circular stirrups; core concrete is filled in the steel pipe; the longitudinal erection ribs and the built-in stirrups are buried in the core concrete, and the built-in stirrups, the core concrete and the steel pipes are coaxially arranged; the vertical erection bars do not directly bear vertical load, and the floors along the height direction of the steel tube concrete column do not need to be connected.
Further, a high-strength rib is locally arranged and welded with the outer wall of the steel pipe by adopting a fillet weld; for the steel tube concrete column with the square section, at least 2 local high-strength ribs are arranged on each side edge of the steel tube.
Further, the width of the locally arranged high-strength rib is 0.08B-0.2B, when the section of the steel pipe concrete column is square, B is the side length of the section of the steel pipe concrete column, and when the section of the steel pipe concrete column is circular, B is the diameter of the section of the steel pipe concrete column.
Further, the local portion Gao Jiangle is made of a high-strength steel plate with strength of Q420, Q550, Q690 or Q960.
Furthermore, the built-in stirrup adopts HRB400 grade steel bars with the diameter of 6-12 mm.
Further, the circular hoops comprise 2 circular stirrups that are brought together in close proximity.
Further, the clear distance between the outer side of the built-in stirrup and the inner wall of the steel pipe is 25-100 mm; the built-in stirrups and the longitudinal stand ribs are spot welded into a whole and are arranged in the steel pipe.
Further, the longitudinal erection rib adopts HPB 300 grade steel bars with the diameter of 6-12 mm; the length of the longitudinal erection ribs is smaller than that of the steel tube concrete column.
Further, the core concrete is natural aggregate concrete, recycled block concrete or recycled block/aggregate concrete.
The construction method of the steel tube concrete column with the stirrups arranged in parts Gao Jiangle comprises the following steps:
processing the steel pipe, and fixing the locally arranged high-strength rib on a local area of the outer wall of the steel pipe;
fixing the manufactured built-in stirrups and the longitudinal support studs into a whole, then placing the integrated stirrups and the longitudinal support studs in a steel pipe and fixing the integrated stirrups to ensure that the central axis of the built-in stirrups coincides with the central axis of the steel pipe, and a clear distance is reserved between the outer side of the built-in stirrups and the inner wall of the steel pipe;
and (5) carrying out field hoisting and splicing of the steel pipe, then filling concrete into the steel pipe, and fully vibrating until the steel pipe is compact.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The performance of the outer steel pipe can be rapidly degraded under fire, the stirrups are arranged in the steel pipe, the core concrete can be restrained by the built-in stirrups, the outer load can be continuously borne, the fire resistance can be greatly improved, the primary fire resistance requirement (more than or equal to 180 min) can be completely realized under some working conditions that the actual load ratio is less than 0.4, and the surface of the steel pipe does not need a fireproof protection layer.
(2) According to the invention, on one hand, the stirrups are arranged in the steel pipe, and on the other hand, the high-strength ribs are locally arranged on the outer wall of the steel pipe, so that the equivalent steel distribution rate of the steel pipes at the upper end and the lower end of the steel pipe concrete column is increased, and on the other hand, the local bulging of the steel pipe is delayed or improved, the constraint on core concrete is enhanced, and further, the anti-seismic performance of the steel pipe concrete column can be improved and the material performance can be fully utilized under the condition that the total steel amount is basically the same.
(3) According to the invention, under the condition that the total steel consumption is basically kept unchanged, the wall thickness of the steel pipe is properly thinned through further material optimization of the steel pipe concrete column, and then a part of thinned steel is used as the built-in stirrup, and the other part of thinned steel is used as the equivalent steel consumption of the upper end and the lower end of the column, so that the material utilization rate can be improved, and the fire resistance and the earthquake resistance of the steel pipe concrete column can be greatly improved.
Drawings
Fig. 1 is a schematic structural view of a concrete filled steel tubular column with a built-in stirrup and a local arrangement Gao Jiangle according to an embodiment of the present invention.
FIG. 2 is a graph comparing axial deformation versus time for a fire test in an embodiment of the present invention.
FIG. 3 is a graph comparing skeleton curves in an earthquake resistance test in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1, a concrete filled steel tube column 1 with a local Gao Jiangle and built-in stirrups provided by the invention comprises a steel tube 2, core concrete 3, a local high-strength rib 4, built-in stirrups 5 and a longitudinal erection rib 6. In order to clearly show the detailed structure of the local high-strength rib and the built-in stirrup, the structure is expressed in a perspective mode in fig. 1. The upper end outer side wall and the lower end outer side wall of the steel pipe 2 are respectively provided with a local high-strength rib 4, the height of the local high-strength rib 4 is 250mm, and it is understood that in other embodiments, the height can be set to other values within the range of 240-375 mm (0.80-1.25B, wherein B is 300 mm); the high-strength rib 4 is locally arranged by adopting a high-strength steel plate with Q690 grade, the actual measured yield strength is 714.1MPa, and in other embodiments, the high-strength rib 4 can also be locally arranged by adopting other brands of high-strength steel plates which are not lower than Q420; the built-in stirrups 5 are arranged on the longitudinal stand bars 6 in a preset interval arrangement mode by adopting single round stirrups, and the stirrup interval is set to be 34mm; the built-in stirrup 5 is placed inside the steel pipe 2, the clear distance between the outside of the built-in stirrup 5 and the inner wall of the steel pipe 2 is 35mm, it being understood that in other embodiments the clear distance may take other values in the range of 25-100 mm. The longitudinal studs 6 do not directly bear vertical loads and there is no need for connection between floors along the height of the column.
In this embodiment, the steel pipe 2 has a square cross section. Each side of the steel pipe 2 is provided with 2 said locally provided high strength ribs 4, respectively.
In the embodiment, the steel pipe 2 is formed by welding two cold-formed steel sections, the cross section size of the steel pipe 2 is 300mm multiplied by 300mm, the wall thickness is 2.96mm, the steel material is Q345B steel plate, and the actual measured yield strength is 437.6MPa.
In the embodiment, the built-in stirrup 5 adopts HRB400 grade steel bars with the diameter of 10mm, and the actually measured yield strength is 414.6MPa.
In the embodiment, the longitudinal erection ribs 6 are steel bars with HPB 300 grade and diameter of 8 mm; the length of the vertical erection ribs 6 is smaller than that of the steel tube concrete column 1.
In this example, the high strength rib 4 is provided locally with a width of 25mm and a thickness of 3.06mm.
In this embodiment, the built-in stirrup 5 is integrally connected to the longitudinal stirrup 6 by spot welding.
In this example, the core concrete 3 was a recycled block concrete having a 150mm cube compressive strength of 32.3MPa.
In the embodiment, when the steel pipe 2 is welded in a butt welding mode, the high-strength rib 4 is locally arranged on the steel pipe 2, the built-in stirrup 5 is welded with the longitudinal stand bars 6, the welding rod is E50-shaped, the welding flux F4A0 is adopted, and the quality grade of the welding seam is one grade.
The construction method of the steel tube concrete column with the local Gao Jiangle and the built-in stirrups provided by the embodiment comprises the following steps:
(1) Processing the steel pipe 2, and welding the locally arranged high-strength rib 4 to a local area of the outer wall of the steel pipe 2;
(2) The manufactured built-in stirrups 5 and the longitudinal stand bars 6 are spot-welded into a whole and then placed in the steel pipe 2 and fixed, so that the central axis of the built-in stirrups 5 coincides with the central axis of the steel pipe 2, and a clear distance is reserved between the outer side of the built-in stirrups 5 and the inner wall of the steel pipe 2;
(3) And (5) carrying out field hoisting and splicing of the steel pipe 2, then filling concrete into the steel pipe 2, and fully vibrating until the steel pipe is compact.
Fire resistance test and finite element analysis:
under the condition that the total steel amount is basically the same, taking a steel pipe concrete column, a steel pipe concrete column with built-in stirrups and a steel pipe concrete column with local Gao Jiangle built-in stirrups as objects, carrying out open fire test and finite element analysis under the action of axial load, and specific results (only giving an axial deformation-fire time curve comparison graph) are shown in fig. 2. As can be seen from the figures: under the condition that the total steel amount is basically the same, the fire resistance limit (namely 203 min) of the steel tube concrete column with the built-in stirrups is basically equivalent to that of the steel tube concrete column with the built-in stirrups (namely 195 min), but is far higher than that of the steel tube concrete column (namely 45 min), and even exceeds the primary fire resistance requirement (more than or equal to 180 min).
Shock resistance test:
under the condition that the total steel amount is basically the same, taking a steel pipe concrete column, a steel pipe concrete column with built-in stirrups and a half column of the steel pipe concrete column with local Gao Jiangle built-in stirrups as objects, carrying out an earthquake-proof test with low-cycle horizontal loading under a fixed axial force, and specific results (a comparison chart of only skeleton curves is given) are shown in fig. 3. As can be seen from the figures: under the condition that the total steel amount is basically the same, the horizontal bearing capacity P of the steel pipe concrete column with the built-in stirrups is increased by about 12% compared with the horizontal bearing capacity P of the steel pipe concrete column with the built-in stirrups; and is about 8% higher than the horizontal bearing capacity P of the concrete filled steel tubular column.
The above results indicate that: according to the construction method of the steel tube concrete column with the local Gao Jiangle and built-in stirrups, provided by the invention, through material optimization, the fire resistance of the column is greatly improved, the primary fire resistance requirement (more than or equal to 180 min) can be completely realized under the condition that the actual load ratio is 0.38, a fireproof protection layer is not needed on the surface of the steel tube, and the earthquake resistance of the column is also improved.
Example 2
The concrete filled steel tube column 1 provided by the embodiment is provided with a local Gao Jiangle and internally provided with stirrups, and comprises a steel tube 2; core concrete 3; a high-strength rib 4 is locally arranged; a built-in stirrup 5 and a longitudinal stand bar 6. The outer side wall of the upper end and the outer side wall of the lower end of the steel pipe 2 are respectively provided with a local high-strength rib 4; a plurality of built-in stirrups 5 are fixed along the length direction of the longitudinal erection ribs 6; a clear distance is reserved between the outer side of the built-in stirrup 5 and the inner wall of the steel pipe 2, and core concrete 3 is filled in the steel pipe 2; the longitudinal erection ribs 6 and the built-in stirrups 5 are buried in the core concrete 3, and the built-in stirrups 5, the core concrete 3 and the steel pipes 2 are coaxially arranged. The longitudinal studs 6 do not directly bear vertical loads and there is no need for connection between floors along the height of the column.
In this embodiment, the steel pipe 2 has a circular cross section.
In this embodiment, a plurality of built-in stirrups 5 are provided on the longitudinal stand bars in a circular shape and hoops are arranged at a preset interval. Wherein the circular parallel hoops comprise 2 circular hoops which are closely close together.
In this embodiment, the clear distance between the outer side of the built-in stirrup 5 and the inner wall of the steel pipe 2 is 25mm.
In this embodiment, the high-strength rib 4 is locally provided and a high-strength steel plate with strength of Q420 is selected.
In this embodiment, the built-in stirrup 5 is an HRB400 grade steel bar with a diameter of 6mm.
In this embodiment, the longitudinal ribs 6 are steel bars of class HPB 300 and diameter 6mm.
In this embodiment, the core concrete 3 is natural aggregate concrete.
Example 3
The concrete filled steel tube column 1 provided by the embodiment is provided with a local Gao Jiangle and internally provided with stirrups, and comprises a steel tube 2; core concrete 3; a high-strength rib 4 is locally arranged; a built-in stirrup 5 and a longitudinal stand bar 6. The outer side wall of the upper end and the outer side wall of the lower end of the steel pipe 2 are respectively provided with a local high-strength rib 4; a plurality of built-in stirrups 5 are fixed along the length direction of the longitudinal erection ribs 6; a clear distance is reserved between the outer side of the built-in stirrup 5 and the inner wall of the steel pipe 2, and core concrete 3 is filled in the steel pipe 2; the longitudinal erection ribs 6 and the built-in stirrups 5 are buried in the core concrete 3, and the built-in stirrups 5, the core concrete 3 and the steel pipes 2 are coaxially arranged. The longitudinal studs 6 do not directly bear vertical loads and there is no need for connection between floors along the height of the column.
In this embodiment, the steel pipe 2 has a circular cross section.
In this embodiment, a plurality of built-in stirrups 5 are provided on the longitudinal stand bars in a circular shape and hoops are arranged at a preset interval. Wherein the circular parallel hoops comprise 2 circular hoops which are closely close together.
In this embodiment, the clearance between the outer side of the built-in stirrup 5 and the inner wall of the steel pipe 2 is 100mm.
In this embodiment, the high-strength rib 4 is partially formed from a high-strength steel plate with strength Q960.
In this embodiment, the built-in stirrup 5 is an HRB400 grade steel bar with a diameter of 12 mm.
In this embodiment, the longitudinal ribs 6 are steel bars of class HPB 300 and diameter 12 mm.
In this embodiment, recycled block/aggregate concrete is used as the core concrete 3.
Example 4
The concrete filled steel tube column 1 provided by the embodiment is provided with a local Gao Jiangle and internally provided with stirrups, and comprises a steel tube 2; core concrete 3; a high-strength rib 4 is locally arranged; a built-in stirrup 5 and a longitudinal stand bar 6. The outer side walls of the upper end and the lower end of the steel pipe 2 are provided with local high-strength ribs 4, and the height of the local high-strength ribs 4 is 400mm; the local high-strength rib 4 adopts a Q690-grade high-strength steel plate; the built-in stirrups 5 are arranged alternately by circular hoops and single circular stirrups according to preset intervals, and the intervals of the stirrups are 75mm; the built-in stirrup 5 is arranged in the steel pipe 2, and the clear distance between the outer side of the built-in stirrup 5 and the inner wall of the steel pipe is 40mm. The longitudinal studs 6 do not directly bear vertical loads and there is no need for connection between floors along the height of the column.
In the embodiment, the steel pipe 2 is formed by welding four steel plates, the cross section size of the steel pipe 2 is 400mm multiplied by 400mm, the wall thickness is 10mm, and the steel material is Q345B steel plate.
In this embodiment, the built-in stirrup 5 is an HRB400 grade steel bar with a diameter of 6mm.
In the embodiment, the width of the local high-strength rib 4 is 40mm; the thickness was 8mm.
In this embodiment, when the steel pipe 2 is processed, the locally-provided high-strength rib 4 is welded to the outer wall of the steel pipe 2 by adopting fillet welding, and two locally-provided high-strength ribs 4 are arranged on each side.
In this embodiment, the built-in stirrup 5 is integrally connected to the longitudinal stirrup 6 by spot welding.
In this embodiment, the core concrete 3 is natural aggregate concrete, and the strength grade of the concrete is C40.
In the embodiment, when the steel pipe 2 is welded in a butt welding mode, the high-strength rib 4 is locally arranged on the steel pipe 2, the built-in stirrup 5 is welded with the longitudinal stand bars 6, the welding rod is E50-shaped, the welding flux F4A0 is adopted, and the quality grade of the welding seam is one grade.
The construction method of the steel tube concrete column with the local Gao Jiangle and the built-in stirrups comprises the following steps:
(1) Processing the steel pipe 2, and welding the locally arranged high-strength rib 4 to a local area of the outer wall of the steel pipe 2;
(2) The manufactured built-in stirrups 5 and the longitudinal stand bars 6 are spot-welded into a whole and then placed in the steel pipe 2 and fixed, so that the central axis of the built-in stirrups 5 coincides with the central axis of the steel pipe 2, and a certain clear distance is reserved between the outer side of the built-in stirrups 5 and the inner wall of the steel pipe 2;
(3) And (5) carrying out field hoisting and splicing of the steel pipe 2, and filling concrete into the steel pipe 2, and fully vibrating until the steel pipe is compact.
Based on the concrete column and the construction method provided by the embodiment, based on the principle of material full utilization, the stirrups are arranged in the steel tube 2, when the performance of the outer steel tube rapidly deteriorates in a fire disaster, the core concrete is restrained by the built-in stirrups, so that the vertical load can be continuously born, the fire resistance of the column is greatly improved, the primary fire resistance requirement (more than or equal to 180 minutes) can be completely met under certain conditions, and a fireproof protection layer is not needed on the surface of the steel tube. In addition, the high-strength ribs are locally arranged on the outer wall of the steel pipe, so that the equivalent steel distribution rate of the steel pipes at the upper end and the lower end of the steel pipe concrete column is increased, the combined action of the locally arranged high-strength ribs and the built-in stirrups delays or improves the local bulging of the steel pipe and strengthens the constraint on core concrete, and the earthquake resistance of the steel pipe concrete column is improved under the condition that the total steel consumption is basically the same.
The specific values provided in the foregoing embodiments are merely specific examples, and in other embodiments, other values may be set.
According to the method of the present invention, a series of implementation examples can be developed, and the present invention is not limited in any way, so any simple modification, equivalent variation and modification made to the above examples according to the technical substance of the present invention still falls within the scope of the technical solution of the present invention.
Claims (9)
1. The steel tube concrete column with the built-in stirrups is locally provided with Gao Jiangle and is characterized by comprising a steel tube (2), core concrete (3), a locally provided Gao Jiangle (4), built-in stirrups (5) and a longitudinal erection rib (6); the local device Gao Jiangle (4) is arranged on the outer side wall of the upper end and the outer side wall of the lower end of the steel pipe (2); the height of the local part Gao Jiangle (4) is 0.80B~1.25BWherein when the section of the steel tube concrete column (1) is square,Bcut off the concrete filled steel tube column (1)The side length of the surface, when the section of the steel tube concrete column (1) is circular,Bthe diameter of the section of the concrete filled steel tube column (1); the local arrangement Gao Jiangle (4) adopts a high-strength steel plate with the mark not lower than Q420; a plurality of built-in stirrups (5) are fixed along the length direction of the longitudinal erection ribs (6); a clear distance is reserved between the outer side of each built-in stirrup (5) and the inner wall of each steel pipe (2), a plurality of built-in stirrups (5) are arranged in a mode that circular parallel stirrups are arranged at preset intervals, or are alternately arranged with single circular stirrups at preset intervals, or are arranged with single circular stirrups at preset intervals, and each circular parallel stirrup comprises 2 circular stirrups which are closely connected; the core concrete (3) is filled in the steel pipe (2); the longitudinal erection ribs (6) and the built-in stirrups (5) are buried in the core concrete (3), and the built-in stirrups (5), the core concrete (3) and the steel pipe (2) are coaxially arranged; the vertical erection ribs (6) do not directly bear vertical load, and the floors along the height direction of the steel tube concrete column (1) do not need to be connected.
2. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the local arrangement Gao Jiangle (4) is welded with the outer wall of the steel pipe (2) by adopting a fillet weld; for the steel tube concrete column (1) with the square cross section, each side edge of the steel tube (2) is provided with at least 2 local devices Gao Jiangle (4).
3. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the width of the local area Gao Jiangle (4) is 0.08B~0.2BWhen the section of the concrete filled steel tube column (1) is square,Bwhen the section of the concrete filled steel tube column (1) is circular,Bthe diameter of the section of the steel tube concrete column (1).
4. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the local part Gao Jiangle (4) is made of high-strength steel plates with the strength of Q420, Q550, Q690 or Q960.
5. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the built-in stirrup (5) adopts HRB400 grade steel bars with the diameter of 6-12 mm.
6. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the clear distance between the outer side of the built-in stirrup (5) and the inner wall of the steel pipe (2) is 25-100 mm; the built-in stirrup (5) and the longitudinal erection ribs (6) are integrally spot-welded and are arranged in the steel pipe (2).
7. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the longitudinal erection ribs (6) are steel bars with HPB 300 grade and diameter of 6-12 mm; the length of the longitudinal erection rib (6) is smaller than that of the steel tube concrete column (1).
8. A concrete filled steel tubular column with a built-in stirrup and a localized Gao Jiangle as set forth in claim 1, wherein: the core concrete (3) is natural aggregate concrete, recycled block concrete or recycled block/aggregate concrete.
9. The construction method of a concrete filled steel tubular column with a built-in stirrup and provided with a local part Gao Jiangle according to any one of claims 1 to 8, comprising the steps of:
machining the steel pipe (2) and fixing the local fixture Gao Jiangle (4) to a local area of the outer wall of the steel pipe (2);
fixing the manufactured built-in stirrup (5) and the longitudinal erection rib (6) into a whole, then placing the integrated structure in the steel pipe (2) and fixing the integrated structure to ensure that the central axis of the built-in stirrup (5) coincides with the central axis of the steel pipe (2), and a clear distance is reserved between the outer side of the built-in stirrup (5) and the inner wall of the steel pipe (2);
and (3) carrying out field hoisting and splicing of the steel pipe (2), then filling concrete into the steel pipe (2), and vibrating until the steel pipe is compact.
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| CN202210779954.1A CN115288364B (en) | 2022-07-04 | 2022-07-04 | Concrete filled steel tube column with local Gao Jiangle and built-in stirrups and construction method thereof |
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|---|---|---|---|---|
| JPH0742304A (en) * | 1993-08-03 | 1995-02-10 | Maeda Corp | Cetrifugally formed steel pipe concrete pillar |
| CN102031846A (en) * | 2010-12-28 | 2011-04-27 | 哈尔滨工业大学 | End-opened inclined rib rectangular steel tube confined concrete column |
| CN204959967U (en) * | 2015-09-29 | 2016-01-13 | 南京林业大学 | Hoop reinforcing concrete filled steel tube |
| CN110173076A (en) * | 2019-06-04 | 2019-08-27 | 姚攀峰 | A kind of no-welding steel core concrete column of high anti-seismic, structural system and its construction method |
| CN213952712U (en) * | 2020-06-03 | 2021-08-13 | 华南理工大学 | Improved concrete-filled steel tube column with built-in stirrups |
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2022
- 2022-07-04 CN CN202210779954.1A patent/CN115288364B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0742304A (en) * | 1993-08-03 | 1995-02-10 | Maeda Corp | Cetrifugally formed steel pipe concrete pillar |
| CN102031846A (en) * | 2010-12-28 | 2011-04-27 | 哈尔滨工业大学 | End-opened inclined rib rectangular steel tube confined concrete column |
| CN204959967U (en) * | 2015-09-29 | 2016-01-13 | 南京林业大学 | Hoop reinforcing concrete filled steel tube |
| CN110173076A (en) * | 2019-06-04 | 2019-08-27 | 姚攀峰 | A kind of no-welding steel core concrete column of high anti-seismic, structural system and its construction method |
| CN213952712U (en) * | 2020-06-03 | 2021-08-13 | 华南理工大学 | Improved concrete-filled steel tube column with built-in stirrups |
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| CN115288364A (en) | 2022-11-04 |
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