Double-steel tube concrete beam-column joint with internal fiber reinforced polymer (FRP) bar connectors and assembly method

Abstract

A double-steel tube concrete beam-column joint with internal FRP bar connectors is provided. The double-steel tube concrete beam-column joint includes double-steel tube columns, I-beams, a joint connector, an internal support member and external ring plates. Each double-steel tube column includes an internal steel tube and an external steel tube. The joint connector includes an internal connecting tube and an external connecting sleeve which are both circular steel tubes. The internal support member is a columnar structure and has two ends regularly formed with bolt holes in a circumferential direction. Each external ring plate comprises a horizontal portion and an annular portion perpendicular to the horizontal portion. Upper and lower double-steel tube columns are connected through the joint connector and the internal support member, the two ends of the internal support member are inserted into an upper internal steel tube and a lower internal steel tube, respectively.

Claims

1. A double-steel tube concrete beam-column joint with internal fiber reinforced polymer (FRP) bar connectors, comprising: double-steel tube columns, I-beams, a joint connector, an internal support member and external ring plates; each double-steel tube column comprises an internal steel tube and an external steel tube, the internal steel tubes are disposed in the external steel tubes, and first connecting lugs are perpendicularly and fixedly disposed at near-joint ends of outer sides of the external steel tubes; the joint connector comprises an internal connecting tube and an external connecting sleeve, wherein the internal connecting tube and the external connecting sleeve are both circular steel tubes, the internal connecting tube is disposed in the external connecting sleeve and the internal connecting tube is connected to the external connecting sleeve through the bar connectors, two ends of the internal connecting tube stretch out of the external connecting sleeve and are formed with through holes, an inner diameter of the external connecting sleeve is greater than an outer diameter of the external steel tubes, second connecting lugs are perpendicularly and fixedly disposed in a middle of an outer side of the external connecting sleeve, and grooves are formed in the external connecting sleeve and the grooves are located above and below the second connecting lugs, respectively; the internal support member is a columnar structure and two ends of the internal support member is regularly formed with bolt holes in a circumferential direction; each external ring plate comprises a horizontal portion and an annular portion perpendicular to the horizontal portion; the double-steel tube columns are connected through the joint connector and the internal support member, the two ends of the internal support member are inserted into the internal steel tubes, respectively, the internal steel tubes are inserted into the internal connecting tube, the external steel tubes are inserted into the external connecting sleeve, and the first connecting lugs are inserted into the grooves; the double-steel tube columns and the I-beams are connected through two sets of said external ring plates, wherein the two sets of external ring plates are vertically symmetrical, annular portions of the two sets of the external ring plates are attached to the external steel tubes, FRP bars sequentially penetrate through the annular portions, the external steel tubes, the internal connecting tube and the internal steel tubes to be fixed in the bolt holes of the internal support member, webs of the I-beams are fixedly connected to the first connecting lugs and the second connecting lugs, and flanges of the I-beams are fixedly connected to the horizontal portions.

2. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein the webs of the I-beams are connected to the first connecting lugs and the second connecting lugs through first connecting plates.

3. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein the flanges of the I-beams are connected to the horizontal portions through second connecting plates.

4. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein two ends of each FRP bar are tapped with external threads, a first end of the each FRP bar is connected to the internal support member in a threaded manner, and a nut is mounted at a second end of the each FRP bar.

5. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein the FRP bars are made of carbon fiber reinforced composites.

6. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein concrete poured into the double-steel tube columns after assembly is steel fiber reinforced concrete.

7. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, wherein the internal support member is as high as the internal connecting tube, and the bolt holes in the two ends of the internal support member correspond to the through holes in the two ends of the internal connecting tube.

8. The double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 7, wherein the internal support member comprises circular components at the two ends and a connecting rod in a middle, the circular components at the two ends are connected through the connecting rod, and the bolt holes are regularly formed in the circular components in the circumferential direction.

9. An assembly method of the double-steel tube concrete beam-column joint with the internal FRP bar connectors according to claim 1, comprising: first, assembling the joint connector above a lower double-steel tube column of the double-steel tube columns to insert the internal steel tube into the internal connecting tube, insert the external steel tube into the external connecting sleeve and insert the first connecting lugs of the external steel tube into the grooves of the external connecting sleeve; second, assembling a bottom of the internal support member in the internal steel tube of the lower double-steel tube column, and enabling the FRP bars to sequentially penetrate through the external steel tube, the internal connecting tube and the internal steel tube to be screwed into the bolt holes in a lower portion of the internal support member; third, assembling an upper double-steel tube column of the double-steel tube columns above the joint connector to insert an upper end of the internal support member into the upper internal steel tube, insert a lower end of the upper internal steel tube into an upper end of the internal connecting tube, insert the upper external steel tube into an upper end of the external connecting sleeve and insert the first connecting lugs of the external steel tube into the grooves in the upper end of the external connecting sleeve, and enabling the FRP bars to sequentially penetrate through the upper external steel tube, the internal connecting tube and the internal steel tube to be screwed in the bolt holes in an upper portion of the internal support member; fourth, connecting each second connecting lug to corresponding upper and lower first connecting lugs through a first connecting plate, wherein the upper and lower double-steel tube columns are connected; fifth, pouring concrete into the double-steel tube columns; sixth, assembling the two sets of external ring plates vertically symmetrically, connecting the annular portions of the external ring plates to the external steel tubes through the FRP bars, and assembling nuts at ends of the FRP bars; and seventh, assembling the I-beams, connecting the flanges to the horizontal portions of the external ring plates through second connecting plates, and connecting the webs to the first connecting plates.

10. The assembly method according to claim 9, wherein the webs of the I-beams are connected to the first connecting lugs and the second connecting lugs through the first connecting plates.

11. The assembly method according to claim 9, wherein the flanges of the I-beams are connected to the horizontal portions through the second connecting plates.

12. The assembly method according to claim 9, wherein two ends of each FRP bar are tapped with external threads, a first end of the each FRP bar is connected to the internal support member in a threaded manner, and a nut is mounted at a second end of the each FRP bar.

13. The assembly method according to claim 9, wherein the FRP bars are made of carbon fiber reinforced composites.

14. The assembly method according to claim 9, wherein the concrete poured into the double-steel tube columns after assembly is steel fiber reinforced concrete.

15. The assembly method according to claim 9, wherein the internal support member is as high as the internal connecting tube, and the bolt holes in the two ends of the internal support member correspond to the through holes in the two ends of the internal connecting tube.

16. The assembly method according to claim 15, wherein the internal support member comprises circular components at the two ends and a connecting rod in a middle, the circular components at the two ends are connected through the connecting rod, and the bolt holes are regularly formed in the circular components in the circumferential direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structural diagram of the invention;

(2) FIG. 2 is a structural diagram of a double-steel tube column;

(3) FIG. 3 is a structural diagram of a joint connector;

(4) FIG. 4 is a first structural diagram of an internal support member;

(5) FIG. 5 is a second structural diagram of the internal support member;

(6) FIG. 6 is a structural diagram of an external ring plate;

(7) FIG. 7 is an exploded view of the invention;

(8) FIG. 8 is a first partial connection diagram of the invention;

(9) FIG. 9 is a second partial connection diagram of the invention;

(10) FIG. 10 is an assembly step diagram;

(11) Reference signs in the figures: 1. double-steel tube column; 11. internal steel tube; 12. external steel tube; 13. connecting lug I; 2. I-beam; 3. joint connector; 31. internal connecting tube; 32. external connecting sleeve; 33. bar connector; 34. connecting lug II; 35. groove; 4. internal support member; 41. circular component; 42. connecting rod; 5. external ring plate; 51. horizontal portion; 52. annular portion; 53. connecting plate I; 54. connecting plate II.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(12) The invention will be further described below in conjunction with the accompanying drawings.

Embodiment 1

(13) As shown in FIG. 1, a double-steel tube concrete beam-column joint with internal FRP bar connectors comprises double-steel tube columns 1, I-beams 2, a joint connector 3, an internal support member 4 and external ring plates 5.

(14) As shown in FIG. 2, each double-steel tube column 1 comprises an internal steel tube 11 and an external steel tube 12 which are both circular steel tubes, connecting lugs I 13 are perpendicularly and fixedly disposed at near-joint ends of the external steel tubes, that is, the connecting lugs I 13 are perpendicularly and fixedly disposed on external surfaces of the bottom of the upper external steel tube and the top of the lower external steel tube, and the number of the connecting lugs I 13 is equal to the number of the I-beams 2 to be connected to the connecting lugs I 13. For example, four connecting lugs I 13 are connected to four I-beams 2 and are regularly distributed in the circumferential direction, in this embodiment. FRP bar through holes for connection are formed in the bottom of the upper external steel tube and the top of the lower external steel tube.

(15) As shown in FIG. 3, the joint connector 3 comprises an internal connecting tube 31 and an external connecting sleeve 32, wherein the internal connecting tube and the external connecting sleeve are both circular steel tubes and are connected through bar connectors 33, two ends of the internal connecting tube 31 stretch out of the external connecting sleeve 32 and are formed with through holes, the inner diameter of the external connecting sleeve 32 is greater than the outer diameter of the external steel tubes 12, connecting lugs II 34 are perpendicularly fixed to the external connecting sleeve 32, and grooves 35 are formed in the external connecting sleeve and are located above and below the connecting lugs II 34, respectively.

(16) As shown in FIG. 4, the internal support member 4 is a columnar structure, and bolt holes are formed in two ends of the internal support member 4 in the circumferential direction, and to save materials and reduce the weight, a groove may be formed in the periphery of the internal support member.

(17) The internal support member 4 is as high as the internal connecting tube 31, and the bolt holes in the two ends of the internal support member 4 correspond to the through holes in the two ends of the internal connecting tube 31.

(18) As shown in FIG. 6, each external ring plate 5 comprises a horizontal portion 51 and an annular portion 52 perpendicular to the horizontal portion 51.

(19) As shown in FIG. 7-FIG. 9, the upper and lower double-steel tube columns 1 are connected through the joint connector 3 and the internal support member 4, the internal support member 4 is inserted into the internal connecting tube 31, the lower end of the upper internal steel tube 11 and the upper end of the lower internal steel tube 11 are inserted into a gap between the internal support tube 4 and the internal connecting tube 31, the external steel tubes 12 are inserted into the external connecting sleeve 32 to enable the connecting lugs I 13 to be inserted into the grooves 35 of the external connecting sleeve, the double-steel tube columns 1 and the I-beams 2 are connected through two sets of external ring plates 5 that vertically symmetrical, the annular portions of the external ring plates 5 are attached to the outer surfaces of the external steel tubes 12, FRP bars sequentially penetrate through the annular portions 52 of the external ring plates, the external steel tubes 12, the inner connecting tube 31 and the internal steel tubes 11 to be fixed in the bolt holes in the internal support member 4, two ends of each FRP bar are tapped with external threads, one end of each FRP bar is connected to the internal support member 4 in a threaded manner, and a nut is mounted at the other end of each FRP bar. Webs of the I-beams 2 are connected to the connecting lugs 113 and the connecting lugs II 34 through connecting plates I 53, and the connecting plates I 53 are connected to the webs of the I-beams, the connecting lugs I and the connecting lugs II through bolts, such that the webs are connected, and the connection of the upper external steel tube and the lower external steel tube is enhanced; and flanges of the I-beams 2 are connected to the horizontal portions 51 of the external ring plates through connecting plates II 54, and the connecting plates II 54 are connected to the flanges of the I-beams and the horizontal portions of the external ring plates through bolts.

(20) The FRP bars are made of carbon fiber reinforced composites.

(21) As shown in FIG. 10, an assembly method of the double-steel tube concrete beam-column joint with internal FRP bar connectors comprises the following steps:

(22) First, the joint connector 3 is assembled above the lower double-steel tube column 1 to insert the internal steel pipe 11 into the internal connecting tube 31, insert the external steel pipe 12 into the external connecting sleeve 32 and insert the connecting lugs 113 of the external steel tube into the grooves 35 of the external connecting sleeve;

(23) Second, the bottom of the internal support member 4 is assembled in the internal steel tube 11 of the lower double-steel tube column, and the FRP bars sequentially penetrate through the external steel tube 12, the internal connecting tube 31 and the internal steel tube 11 to be screwed into threaded holes below the internal support member 4;

(24) Third, the upper double-steel tube column 1 is assembled above the joint connector 3 to insert the upper end of the internal support member 4 into the upper internal steel tube 11, insert the lower end of the upper internal steel tube 11 into the upper end of the internal connecting tube 31, insert the upper external steel tube 12 into the upper end of the external connecting sleeve 32 and insert the connecting lugs I 13 of the external steel tube into the grooves 35 of the external connecting sleeve, and the FRP bars sequentially penetrate through the external steel tube 12, the internal connecting tube 31 and the internal steel tube 11 to be screwed into threaded holes above the internal support member 4.

(25) Fourth, each connecting lug II 34 and the corresponding upper and lower connecting lugs I 13 are connected through one connecting plate I 53, so that the upper and lower double-steel tube columns 1 are connected;

(26) Fifth, concrete is poured into the double-steel tube columns 1, wherein the concrete poured into the double-steel tube columns 1 is steel fiber reinforced concrete, so that cracks in the concrete can be reduced;

(27) Sixth, two sets of external ring plates 5 are assembled vertically symmetrically, the annular portions 52 of the external ring plates are connected to the external steel tubes 12 through the FRP bars, and the nuts are assembled at the ends of the FRP bars; and

(28) Seventh, the I-beams 2 are assembled, the flanges are connected to the horizontal portions 51 through the connecting plates II 54, and the webs are connected to the connecting plates I 53.

Embodiment 2

(29) As shown in FIG. 5, to save materials and reduce the weight, the middle of the internal support member 4 is hollowed out, and the two ends formed with bolt holes are reserved; the internal support member 4 comprises circular components 41 at the two ends and a connecting rod 42 in the middle, the circular components 41 at the two ends are connected through the connecting rod 42, and bolt holes are regularly formed in the circular components 41 in the circumferential direction.

(30) This embodiment is identical with Embodiment 1 in other aspects.

(31) The above embodiments are merely preferred ones of the invention, and are not intended to limit the invention. Those skilled in the art can make different modifications and alterations to the invention. Any amendments, equivalent substitutions and improvements obtained based on the spirit and principle of the invention should also fall within the protection scope of the invention.