CN110847364A

CN110847364A - Novel wood member concatenation node

Info

Publication number: CN110847364A
Application number: CN201911175696.0A
Authority: CN
Inventors: 牛爽; 李世光; 严佳川; 张妩迪; 唐一栋; 钱福生; 晏阳天
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-02-28

Abstract

A novel wood member splicing node relates to the technical field of building connection. The invention aims to solve the problem that the existing wood component bar-planted connecting joint is often fragile and damaged and affects the safety of the structure. The wood member splicing structure comprises two wood members to be connected, two groups of cross grain tie pieces and four groups of embedded bars, wherein the splicing ends of the two wood members to be connected are arranged oppositely and complementarily, the splicing end of the wood members to be connected is an inclined plane, an FRP layer is respectively glued on the two inclined planes, the upper part and the lower part of the splicing end of the wood members to be connected are respectively provided with one group of embedded bars, one end of each embedded bar is embedded in the wood members to be connected along the length direction, the other end of each embedded bar is exposed out of the inclined plane, the exposed end of each embedded bar is fixedly connected with the exposed end of the corresponding embedded bar on the wood member to be connected on the opposite side, two groups of cross grain tie pieces are inserted in the splicing section of the two wood members to be connected in parallel along the length direction of the wood members to. The invention is used for connecting wood members.

Description

Novel wood member concatenation node

Technical Field

The invention relates to the technical field of building connection, in particular to a novel wood member splicing node.

Background

With the development of engineering wood products and processing technologies, modern wood structure buildings are not limited to the construction of small houses any more, but are increasingly applied to large structures such as large spans, high-rise buildings and the like. Longer members such as basic members of super long beams, columns, arches, etc. are commonly used in such large structures. However, due to the limitation of transportation conditions, such ultra-long members need to be manufactured in sections and assembled and connected into a whole after being transported to the site. The common connection mode for splicing the components is steel clamping plates or steel filling plate bolt connection, as shown in figure 1. However, such bolted joints exhibit low stiffness and significant slip under internal forces such as bending moments, are typical semi-rigid joints, and in some cases even approach the performance of a hinged joint, and constitute a severe weakness to the member integrity.

The bar-planted connection has the advantages of high rigidity, high strength and the like, and is favored in component connection, however, a formed node often shows a brittle failure mode, namely the bearing capacity is often suddenly and greatly reduced after the ultimate bearing capacity is reached, and the sufficient ductile deformation capacity is lacked, and the brittle failure behavior is very unfavorable for the structure safety.

Disclosure of Invention

The invention provides a novel wood member splicing node, aiming at solving the problem that the existing wood member bar-planting connecting node is often fragile and damaged and affects the structure safety.

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

a novel wood member splicing node comprises two wood members to be connected, two groups of cross grain tie pieces and four groups of planting bars, wherein the splicing ends of the two wood members to be connected are oppositely and complementarily arranged, the splicing end of the wood members to be connected is an inclined plane, an FRP layer is respectively glued on the two inclined planes, the upper part and the lower part of the splicing end of the wood members to be connected are respectively provided with one group of planting bars, each group of planting bars comprises a plurality of planting bars arranged along the thickness direction of the wood members to be connected, one end of each planting bar is embedded in the wood members to be connected along the length direction, the other end of each planting bar is exposed out of the inclined plane, the exposed end of each planting bar is fixedly connected with the exposed end of the corresponding planting bar on the opposite wood members to be connected, two groups of cross grain tie pieces are inserted in the length direction of the wood members to be connected in parallel in the splicing section of the two wood members to be connected, each group of cross grain tie pieces comprises a plurality of cross grain tie pieces uniformly, every striation drawknot all sets up along the width direction of waiting to connect timber compoment, and the striation drawknot passes the inclined plane.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a novel component splicing node form based on bar planting connection, which has excellent mechanical properties such as node rigidity and bearing capacity, shows higher residual strength and ductile deformability after damage, avoids the serious consequence of structural overall collapse, and can improve the bending rigidity of the node by more than 100% compared with a common bolt connection node.

2. The embedded steel bar connecting node can obviously enhance the connecting strength and rigidity of the node, and has enough ductility and good appearance effect.

Drawings

FIG. 1 is a schematic view of an integral joint formed by fixedly connecting exposed ends of embedded bars 2 in two wood members 1 to be connected;

FIG. 2 is a left side view of FIG. 1;

fig. 3 is a schematic structural view of the wood member 1 to be joined in the present invention;

FIG. 4 is a schematic structural diagram of the splicing node of the present invention when subjected to a bending moment, wherein the direction of the arrow indicates the moment acting direction;

FIG. 5 is a schematic view of the construction of the splice joint of the present invention in tension, wherein the direction of the arrows indicate the direction of axial force;

fig. 6 is an overall structural schematic diagram of the wood member 1 to be connected in the invention when the exposed end of each embedded bar 2 is fixedly connected with the exposed end of the corresponding embedded bar 2 on the opposite side through the metal connecting piece 5.

Detailed Description

The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 6, and the novel wood member splicing node in the embodiment includes two wood members 1 to be connected, two sets of cross grain drawknot components 3 and four sets of embedded bars 2, the splicing ends of the two wood members 1 to be connected are oppositely and complementarily arranged, the splicing end of the wood member 1 to be connected is an inclined surface 1-1, a FRP layer 4 is respectively cemented on the two inclined surfaces 1-1, a set of embedded bars 2 is respectively arranged on the upper part and the lower part of the splicing end of the wood member 1 to be connected, each set of embedded bar 2 includes a plurality of embedded bars 2 arranged along the thickness direction of the wood member 1 to be connected, one end of each embedded bar 2 is embedded in the wood member 1 to be connected along the length direction, the other end of each embedded bar 2 is exposed out of the inclined surface 1-1, the exposed end of each embedded bar 2 is fixedly connected with the exposed end of the corresponding embedded bar 2 on the wood member 1 to be connected on the opposite side, and two sets of cross grain drawknot are arranged in parallel in the splicing section of The piece 3, every group striation drawknot piece 3 includes a plurality of striation drawknot pieces 3 that set up along the thickness direction equipartition of waiting to connect timber compoment 1, and every striation drawknot piece 3 all sets up along the width direction of waiting to connect timber compoment 1, and striation drawknot piece 3 passes inclined plane 1-1.

In this embodiment, the exposed end of each planting bar 2 and the exposed end of the corresponding planting bar 2 on the opposite wood member 1 to be connected may be directly and fixedly connected, or may be indirectly and fixedly connected through other members.

The transverse crack 1-2 in the figure 3 is a transverse crack which is possibly generated and developed inwards by the member in the stress process, and the glued FRP layer 4 has excellent tensile rigidity and strength and is used for preventing the transverse crack of the wood from being generated on the connecting end surface in the stress process and inhibiting the generation and development of the transverse crack 1-2.

In the present embodiment, the deformation rigidity of the feather grain embedded bar 2 is significantly higher than the pin connection rigidity formed by the transverse grain drawknot 3. Therefore, under the bending moment and the axial force of the component, the embedded bar 2 bears most of the internal force and is a key component contributing to the stress strength and the rigidity. When the bar planting 2 is subjected to brittle fracture under accidental load and loses bearing capacity and rigidity immediately, the pin connection formed by the cross grain drawknot 3 transmits the bending moment of the component through axial tension and extrudes the axial force of the wood pin slot transmission component through lateral deformation, and the axial force is shown in fig. 4 and 5. The bearing capacity level formed by the cross grain drawknot component 3 at the stage is considerable, the bearing capacity of the embedded bar 2 can be approached through proper design, meanwhile, the axial stretching and the lateral deformation of the cross grain drawknot component 3 cause the compression of the cross grain of the wood and the extrusion deformation of the pin grooves along the grain, and the two deformations have obvious plastic deformation capacity, thereby developing enough ductile deformation to avoid the structure from losing the integrity and collapsing.

The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 6, in the embodiment, grooves 6 are formed in the upper portion and the lower portion of the joint of the two wood members 1 to be connected, the grooves 6 are formed in the joints of the planted bars 2 and are arranged along the thickness direction of the wood members 1 to be connected, metal connecting pieces 5 are clamped in the grooves 6, the shapes of the metal connecting pieces 5 are the same as those of the grooves 6, and the exposed ends of the planted bars 2 are fixedly connected to the side walls of the metal connecting pieces 5 respectively. Other components and connection modes are the same as those of the first embodiment.

In this embodiment, in order to facilitate on-site assembly type installation, the exposed end of each embedded bar 2 is indirectly and fixedly connected with the exposed end of the corresponding embedded bar 2 on the opposite side wood member 1 to be connected through the metal connecting piece 5. The metal connecting member 5 should be such that an installer can insert a hand or a fastening tool thereinto to perform a connecting operation.

The third concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 3 and 6, in which the inclined surface 1-1 is disposed between the bottom corners of the outer sides of the two grooves 6. Other components and connection modes are the same as those of the second embodiment.

The design is convenient for realizing the processing of the groove 6, and simultaneously, the integral strength and the stability of the wood member are improved.

The fourth concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 2 and 4, and the cross-grain fastener 3 of the present embodiment is a bolt or a screw. The other components and the connection mode are the same as those of the first embodiment, the second embodiment or the third embodiment.

The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to 3 and 6, and the included angle between the inclined surface 1-1 and the axis of the wood member 1 to be connected in the length direction is 30-45 degrees. The other components and the connection mode are the same as those of the fourth embodiment.

The design makes the cross grain pulling piece 3 have enough space for installation.

The sixth specific implementation mode: referring to fig. 1 to 3 and fig. 6, the present embodiment is described, in which each set of the steel bar planting 2 includes two steel bar planting 2, and each set of the transverse stripe fastener 3 includes two transverse stripe fasteners 3. Other components and connecting modes are the same as those of the first embodiment, the second embodiment, the third embodiment or the fifth embodiment.

The seventh embodiment: referring to fig. 6, the present embodiment will be described, in which one gasket 7 is provided on each of the inner and outer sides of the outer side wall of the metal joint 5. Other components and connection modes are the same as those of the second embodiment or the third embodiment.

The design allows the wood member 1 to be connected and the embedded bar 2 and the metal connecting piece 5 to slide relatively in the installation process of the cross grain drawknot piece 3, so that the wood member 1 to be connected is prevented from being subjected to cross grain splitting damage at the position.

The specific implementation mode is eight: the present embodiment will be described with reference to fig. 6, and the gasket 7 of the present embodiment is a gasket made of a polytetrafluoroethylene material. Other components and connection modes are the same as those of the second embodiment or the third embodiment.

Principle of operation

The manufacturing method of the splicing node comprises the following steps:

1. prefabrication: the method comprises the steps that a factory firstly prefabricates a wood member 1 to be connected, cuts an inclined plane 1-1 and a groove 6, implants 2 into the wood member 1 to be connected, one end of each implant 2 is embedded into the wood member 1 to be connected along the length direction of the wood member 1 to be connected, the other end of each implant 2 is exposed to a proper length, a FRP (fiber reinforced plastic) layer 4 is glued on the inclined plane 1-1 by structural glue, and bolt holes or screw holes are pre-drilled at the set position of a cross grain tie piece 3 on the wood member 1 to be connected;

2. splicing on site: after two oppositely arranged wood members 1 to be connected are butted, a metal connecting piece 5 is arranged in a groove 6, and then the exposed end of each planting bar 2 is fixedly connected to the side wall of the metal connecting piece 5;

3. and installing the cross grain pulling piece 3.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. The utility model provides a novel timber compoment concatenation node which characterized in that: the novel wood member splicing node comprises two wood members (1) to be connected, two groups of cross grain tie pieces (3) and four groups of embedded bars (2), the splicing ends of the two wood members (1) to be connected are oppositely and complementarily arranged, the splicing end of the wood member (1) to be connected is an inclined plane (1-1), a FRP layer (4) is respectively glued on the two inclined planes (1-1), the upper part and the lower part of the splicing end of the wood member (1) to be connected are respectively provided with a group of embedded bars (2), each group of embedded bars (2) comprises a plurality of embedded bars (2) which are arranged along the thickness direction of the wood member (1) to be connected, one end of each embedded bar (2) is embedded in the wood member (1) to be connected along the length direction, the other end of each embedded bar (2) is exposed out of the inclined plane (1-1), the exposed end of each embedded bar (2) is fixedly connected with the exposed end of the corresponding embedded bar (2) on the opposite wood member (1) to be connected, two timber compoments (1) of waiting to connect splice the district section and have two sets of cross striation drawknot pieces (3) along the timber compoment (1) length direction of waiting to connect side by side the cartridge, and every cross striation drawknot piece (3) of group includes a plurality of cross striation drawknot pieces (3) of setting along the thickness direction equipartition of waiting to connect timber compoment (1), and every cross striation drawknot piece (3) all sets up along the width direction of waiting to connect timber compoment (1), and cross striation drawknot piece (3) pass inclined plane (1-1).

2. The novel wood member splicing node according to claim 1, wherein: two upper and lower two portions of waiting to connect timber compoment (1) concatenation department are equipped with recess (6), and recess (6) set up in the junction of bar planting (2), and set up along the thickness direction of waiting to connect timber compoment (1), and the card is equipped with metallic interconnect (5) in recess (6), and the shape of metallic interconnect (5) is the same with the shape of recess (6), and the end that exposes of every bar planting (2) is rigid coupling respectively at metallic interconnect (5) lateral wall.

3. The novel wood member splicing node according to claim 2, wherein: the inclined plane (1-1) is arranged between the bottom corners of the outer sides of the two grooves (6).

4. A novel wood member splicing node according to claim 1, 2 or 3, wherein: the cross grain pulling piece (3) is a bolt or a screw.

5. The novel wood member splicing node according to claim 4, wherein: the included angle between the inclined plane (1-1) and the axial line of the wood member (1) to be connected in the length direction is 30-45 degrees.

6. The novel wood member splicing node according to claim 1, 2, 3 or 5, wherein: each group of the embedded steel bars (2) comprises two embedded steel bars (2), and each group of the transverse grain drawknot pieces (3) comprises two transverse grain drawknot pieces (3).

7. The novel wood member splicing node according to claim 2 or 3, wherein: and the inner side and the outer side of the outer side wall of the metal connecting piece (5) are respectively provided with a gasket (7).

8. The novel wood member splicing node of claim 7, wherein: the gasket (7) is made of polytetrafluoroethylene material.