CN115749003A - Novel composite material pultrusion section truss node and construction method thereof - Google Patents

Abstract

The invention discloses a novel composite material pultruded profile truss node and a construction method thereof, relates to the technical field of building construction, and is used for solving the problems of complex connection process, poor integrity and low connection efficiency of composite material pultruded profile fabricated structure system nodes. The steel bar comprises a section bar piece, a U-shaped steel sleeve and a transverse connection steel sleeve, wherein the section bar piece comprises an upper chord, an inclined stay bar and a vertical bar; the U-shaped steel sleeves are wrapped at the connecting points of the upper chord, the diagonal brace and the vertical rods and are fixed through high-strength bolts; the transverse connection steel sleeves are arranged on the left side and the right side of the U-shaped steel sleeve, and transverse connection cross rods and inclined rods are embedded in the transverse connection steel sleeves. The U-shaped steel sleeve connecting piece is adopted instead of two separated node plates, so that the node has better overall rigidity and torsion resistance, the stress area of the bolt pretightening force is enlarged, the hole stress during bolt pretightening is effectively reduced, the fussy bolt gasket installation procedure is omitted, and the initial damage of the section bar rod piece caused by the action of the bolt pretightening force is avoided.

Description

Novel composite material pultrusion section truss node and construction method thereof

Technical Field

The invention relates to the technical field of building construction, in particular to a novel composite material pultrusion section truss node and a construction method thereof.

Background

The composite material has the characteristics of high strength, good durability and the like, and a light structure system assembled by adopting the composite material pultruded profile rod pieces can better meet the construction requirements of civil engineering on light weight and high strength. Because composite profiles cannot be welded and exhibit typical orthotropic properties, node joining of pultruded profile rods remains a key bottleneck that limits the development of fabricated structures. The currently adopted connection modes of the composite materials mainly comprise the following modes:

firstly, mechanical connection or glue bolt mixed connection;

secondly, connecting rod pieces by adopting a node plate and a special-shaped node connecting piece;

thirdly, the integral node of the section is processed by adopting a directly improved production process.

The three schemes have the problems of poor integrity, insufficient bearing capacity and low connection efficiency.

Therefore, there is a need to develop a novel composite material pultruded profile truss node and a construction method thereof, which can effectively improve the connection performance of the pultruded profile rod member node.

Disclosure of Invention

Aiming at the engineering difficulty of the node connection of the traditional composite material pultruded profile, the invention aims to provide the composite material pultruded profile node and the construction method thereof, which have the advantages of good integrity, high bearing capacity and more reasonable stress mode, and solve the problems of complex node connection process, poor integrity and low connection efficiency of an assembly structure system of the composite material pultruded profile.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a novel composite pultruded profile truss node, comprising:

the section bar comprises an upper chord, an inclined stay bar and a vertical bar;

the U-shaped steel sleeve is wrapped at the connecting points of the upper chord, the inclined support rod and the vertical rod and is respectively fixed with the upper chord, the inclined support rod and the vertical rod through high-strength bolts;

the transverse connection steel sleeves are mounted on the left side and the right side of the U-shaped steel sleeve, and transverse connection cross rods and inclined rods are embedded in the transverse connection steel sleeves.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the novel composite material pultrusion section truss node comprises a section bar, a U-shaped steel sleeve and a transverse connection steel sleeve, wherein the section bar comprises an upper chord, an inclined stay bar and a vertical bar; the U-shaped steel sleeves are buckled at the connecting points of the upper chord, the inclined supporting rod and the vertical rod and are respectively fixed with the upper chord, the inclined supporting rod and the vertical rod through high-strength bolts; the transverse connection steel sleeves are arranged on the left side and the right side of the U-shaped steel sleeve, and transverse connection cross rods and inclined rods are embedded in the transverse connection steel sleeves. The node connection core area of the invention adopts the steel connecting piece, and compared with the composite material integrally-formed node and the composite material connecting piece, the bearing capacity of the node is effectively improved. The U-shaped steel sleeve connecting piece is adopted instead of two separated node plates, so that the node has better integral rigidity and torsion resistance. Moreover, the stress area of the bolt pretightening force is enlarged by adopting the U-shaped steel sleeve connecting piece, the hole circumferential stress during bolt pretightening can be effectively reduced, and the complicated bolt gasket mounting process is saved. Most importantly, the connecting piece of the U-shaped steel sleeve can bear larger pre-tightening load, and initial damage to the section bar rod piece due to the pre-tightening force of the bolt is avoided.

2. The construction method of the novel composite material pultrusion section truss node adopts the closed section with better section integrity and stability, avoids the unfavorable local failure modes of flange fracture, web buckling and the like possibly occurring in the connection scheme of the open section, and exerts the material performance of the pultrusion section to the maximum extent. And moreover, the connecting mode of the rod pieces enables all the web members to only bear axial tension and compression, so that the transverse stress mode which is not beneficial to orthotropic materials is avoided, and meanwhile, the integrity of the upper chord is effectively ensured. Most importantly, the requirements of connecting nodes of the composite material pultruded profile rod piece with large bearing capacity and fatigue resistance are met, and the weak node connecting part in a composite material profile truss structure system is effectively enhanced. The integral U-shaped steel sleeve connecting joint is convenient to install and more beneficial to prefabricating, assembling and constructing and standardized production.

Furthermore, in order to ensure the stress stability, the upper chord, the diagonal brace and the vertical bars are arranged in a non-square shape or a T-shaped shape.

Further, the connecting node is arranged at a rod node part of the profile rod, and the rod node part is a multi-rod intersection. As a result, there are often problems with poor integrity, insufficient load-bearing capacity, and inefficient connections at the connection nodes.

The invention also provides a construction method of the novel composite material pultrusion section truss node, which comprises the following steps:

step S1: manufacturing a U-shaped steel sleeve according to the size of a section bar, and drilling and positioning at a corresponding position, wherein the section bar comprises an upper chord, an inclined stay bar and a vertical bar;

step S2: sleeving a U-shaped steel sleeve from the lower part of the upper chord member, then embedding a vertical rod and an inclined stay bar, and connecting the U-shaped steel sleeve with a high-strength bolt to complete plane node installation;

and step S3: installing a transverse connection steel sleeve on the left side and the right side of the U-shaped steel sleeve for positioning, and utilizing a high-strength bolt to enable the transverse connection steel sleeve and the plane node to form a whole;

and step S4: and embedding the transverse connection cross rods and the inclined rods into the transverse connection steel sleeves, and connecting by adopting high-strength bolts, thereby completing the whole installation of the composite material pultrusion section space nodes.

Furthermore, the section bar is made of glass fiber composite material GFRP. The section bar has low price and wide application.

Furthermore, the distance between the two walls of the U-shaped steel sleeve and the transverse connection steel sleeve can be adjusted according to the width of the pultrusion section bar.

Drawings

FIG. 1 is a schematic structural view of a truss node of a novel composite pultruded profile according to an embodiment of the present invention;

FIG. 2 is a schematic representation of a planar connecting node of a novel composite pultruded profile truss node according to an embodiment of the present disclosure;

fig. 3 is a schematic plan view of a novel composite pultruded profile truss node according to an embodiment of the present invention.

In the figure:

101-vertical rods, 102-diagonal rods, 103-upper chords, 104-U-shaped steel sleeves, 105-high-strength bolts,

201-steel jacket, 202-transverse cross bar and 203-diagonal bar.

Detailed Description

The novel composite material pultrusion section truss node and the construction method thereof provided by the invention are further described in detail by combining the attached drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. The technical contents and features of the present invention will be described in detail below with reference to the accompanying drawings by way of examples. It is further noted that the drawings are in greatly simplified form and are not to precise scale, merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this should not be construed as limiting the technical solution of the present invention.

Example one

The structural composition of the truss node of the novel composite material pultrusion profile of the invention is described with reference to fig. 1 to 3.

Referring to fig. 1 to 3, a novel composite material pultruded profile truss node includes a profile rod, a U-shaped steel jacket 104, and a transverse connection steel jacket 201, wherein the profile rod includes an upper chord 103, an inclined strut 102, and a vertical rod 101; the U-shaped steel sleeve 104 is buckled at the connecting point of the upper chord 103, the diagonal brace 102 and the vertical rod 101 and is respectively fixed with the upper chord 103, the diagonal brace 102 and the vertical rod 101 through high-strength bolts 105; the transverse connection steel sleeve 201 is arranged on the left side and the right side of the U-shaped steel sleeve 104, and a transverse connection cross rod 202 and an inclined rod 203 are embedded on the transverse connection steel sleeve 201.

Particularly, the node connection core area adopts the steel connecting piece, and compared with the integrally formed node made of the composite material and the composite material connecting piece, the bearing capacity of the node is effectively improved. The U-shaped steel sleeve connecting piece is adopted instead of two separated node plates, so that the node has better integral rigidity and torsion resistance. Moreover, the stress area of the bolt pretightening force is enlarged by adopting the U-shaped steel sleeve connecting piece, the hole stress during bolt pretightening can be effectively reduced, and the complicated bolt gasket installation process is saved. Most importantly, the U-shaped steel sleeve connecting piece can bear larger pre-tightening load, and initial damage to the section bar rod piece due to the pre-tightening force of the bolt is avoided.

In the present embodiment, it is more preferable that the upper chord 103, the diagonal brace 102 and the vertical bar 101 are arranged in a zigzag shape or a T-shape in order to ensure the stability of the force.

Example two

In this embodiment, it is more preferable that the connecting node is disposed at a node portion of the rod of the profile, where the node portion refers to a junction of multiple rods. As a result, there are often problems with poor integrity, insufficient load-bearing capacity, and inefficient connections at the connection nodes.

With continuing reference to fig. 1 to 3, the present invention further provides a construction method of a novel composite material pultruded profile truss node, which includes the following steps:

s1, manufacturing U-shaped steel 104 according to the size of a section bar, and drilling and positioning at a corresponding position, wherein the section bar comprises an upper chord 103, an inclined stay bar 102 and a vertical bar 101;

step S2: sleeving a U-shaped steel sleeve 104 from the lower part of an upper chord 103, then embedding a vertical rod 101 and an inclined strut 102, and connecting the U-shaped steel sleeve 104 by using a high-strength bolt 105 to complete plane node installation;

and step S3: installing the transverse connection steel sleeve 201 on the left side and the right side of the U-shaped steel sleeve 104 for positioning, and utilizing the high-strength bolt 105 to enable the transverse connection steel sleeve 201 and the plane node to form a whole;

and step S4: and embedding the transverse connection cross rods 202 and the inclined rods 203 on the transverse connection steel sleeves 201, and connecting by adopting high-strength bolts 105, thereby completing the complete installation of the composite material pultrusion section space nodes.

In this embodiment, the profile bar is more preferably made of a glass fiber composite material GFRP. The section bar has low price and wide application.

In this embodiment, it is more preferable that the distance between the two walls of the U-shaped steel sleeve 104 and the lateral connection steel sleeve 201 should be adjusted according to the width of the pultruded profile rod.

In this embodiment, more preferably, parameters such as the wall thickness of the U-shaped steel sleeve 104 and the number of high-strength bolts are selected and are preferably adjusted according to the design strength of the truss node.

Particularly, the construction method of the novel composite material pultrusion section truss node adopts the closed section with better section integrity and stability, avoids the unfavorable local failure modes such as flange breakage, web buckling and the like possibly occurring in the connection scheme of the open section, and exerts the material performance of the pultrusion section to the maximum extent. And moreover, the connecting mode of the rod pieces enables all the web members to only bear axial tension and compression, so that the transverse stress mode which is not beneficial to orthotropic materials is avoided, and meanwhile, the integrity of the upper chord is effectively ensured. Most importantly, the requirements of connecting nodes of the composite material pultruded profile rod piece with large bearing capacity and fatigue resistance are met, and the weak node connecting part in a composite material profile truss structure system is effectively enhanced. The integral U-shaped steel sleeve connecting joint is convenient to install and more beneficial to prefabricating, assembling and constructing and standardized production.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (6)

1. The utility model provides a novel combined material pultrusion section bar truss node which characterized in that includes:

the section bar comprises an upper chord, an inclined stay bar and a vertical bar;

the U-shaped steel sleeve is buckled at the connecting points of the upper chord, the diagonal brace and the vertical rod and is respectively fixed with the upper chord, the diagonal brace and the vertical rod through high-strength bolts;

the transverse connection steel sleeves are mounted on the left side and the right side of the U-shaped steel sleeve, and transverse connection cross rods and inclined rods are embedded in the transverse connection steel sleeves.

2. The novel composite pultruded profile truss node according to claim 1, wherein said upper chords, diagonal struts and vertical struts are arranged in a "cross" or "T" configuration.

3. The novel composite pultruded profile truss node according to claim 1, wherein said connecting nodes are provided at rod node locations of said profile rods, said rod node locations being multi-rod junctions.

4. A construction method of a novel composite material pultrusion section truss node is characterized by comprising the following steps:

s1, manufacturing a U-shaped steel sleeve according to the size of a section bar, and drilling and positioning at a corresponding position, wherein the section bar comprises an upper chord, an inclined stay bar and a vertical bar;

step S2: sleeving a U-shaped steel sleeve from the lower part of the upper chord member, then embedding a vertical rod and an inclined stay bar, and connecting the U-shaped steel sleeve with a high-strength bolt to complete plane node installation;

and step S3: installing a transverse connection steel sleeve on the left side and the right side of the U-shaped steel sleeve for positioning, and utilizing a high-strength bolt to enable the transverse connection steel sleeve and the plane node to form a whole;

and step S4: and embedding the transverse connection cross rods and the inclined rods into the transverse connection steel sleeves, and connecting by adopting high-strength bolts, thereby completing the whole installation of the composite material pultrusion section space nodes.

5. Construction method according to claim 4, wherein the profile bar is made of GFRP.

6. The construction method according to claim 4, wherein the distance between the two walls of the U-shaped steel sleeve and the lateral connection steel sleeve is adjusted according to the width of the pultruded profile rod.

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