CN205975968U - A take curb plate bolt node for eccentric beam column - Google Patents

Abstract

A bolted joint with side plate for eccentric beam-column, comprising a first steel plate and a second steel plate arranged on both sides of a multi-cavity concrete-filled steel pipe composite column, wherein the first steel plate includes a connected first section of steel plate, a second steel plate The first steel plate and the third steel plate are symmetrically arranged on both sides of the second steel plate, and the first steel plate and the third steel plate are arranged obliquely at both ends of the second steel plate. The multi-cavity steel pipe The other side wall of the concrete composite column is also provided with a third steel plate, both ends of the first steel plate and the third steel plate are in contact with the third steel plate, and the third steel plate and the third steel plate are parallel to the second steel plate. The utility model has a high degree of joint assembly and reliable joint connection. The multi-cavity steel pipe concrete composite column, steel plate, steel beam, ear plate, third steel plate and connecting angle steel can all be prefabricated in the factory, reducing the welding workload of installation. Installation simply requires positioning of the assembly.

Description

A bolted joint with side plate for eccentric beam-column

technical field

The utility model relates to a multi-cavity steel pipe concrete composite column structure system in the technical field of construction engineering, in particular to a bolt node with side plates for eccentric beam columns.

Background technique

The multi-cavity steel pipe concrete composite column composite structure system is a new type of steel pipe concrete composite column structure system that solves the problem of protruding column feet in residential systems. It has the advantages of high bearing capacity, good plasticity and toughness, and convenient construction.

At present, my country's "Technical Regulations for Rectangular Concrete-filled Steel Tube Structures" (GECS159: 2004) provides steel-beam joints for concrete-filled steel tube composite columns, which mainly include inner diaphragm type and outer ring plate type. But so far, there are the following deficiencies in the connection between the steel pipe concrete composite column and the steel beam node in the prior art:

(1) When the inner diaphragm and the flange of the beam in the inner diaphragm joint are in the same horizontal plane, the joint meets the requirements of rigid joints, but this kind of joint can only be used when the side of the pipe column is long. Because when the side length is small, it is not only difficult to weld, but also hinders the concrete pouring in the pipe. In addition, the beam flange and the inner partition plate penetrate the weld on both sides of the same column wall, and the steel produces a large welding residual stress, which makes the steel at the joint easy to produce Delamination or brittle failure.

(2) Affect the appearance and use of the building. Such as the outer ring plate joint, the construction of this joint is simple, the force transmission is clear, and it is not limited by the side length of the steel pipe, but a sufficiently large horizontal ring plate is required to ensure the strength of the joint, and the amount of steel used is larger than that of the inner diaphragm joint. And when applied to corner columns, the horizontal ring plate not only hinders the installation of wall panels, but also causes the reinforcing ring to protrude from the building facade, causing convex corners at the indoor and outdoor nodes, which affects the look and feel, which needs to be solved by decoration or ceiling.

(3) The mechanical properties of joints and the simplicity and economy of construction cannot be both. In practical applications, some types of joints have better mechanical properties and overall stiffness of the joints, but the amount of materials used is large and the construction is complicated.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a bolted joint with side plates for eccentric beams and columns. By adopting the separation of the beam end from the wall edge of the column and the full-height side plate, the utility model satisfies the requirements of "strong column, weak beam, strong joint". Based on the design principle of "weak components", the joint structure is simple, the force transmission is clear, and the assembly degree is high.

In order to achieve the above object, the utility model is realized through the following technical solutions.

A bolted joint with side plate for eccentric beam-column, comprising a first steel plate and a second steel plate arranged on both sides of a multi-cavity concrete-filled steel pipe composite column, wherein the first steel plate includes a connected first section of steel plate, a second steel plate The first steel plate and the third steel plate are symmetrically arranged on both sides of the second steel plate, and the first steel plate and the third steel plate are arranged obliquely at both ends of the second steel plate. The multi-cavity steel pipe The other side wall of the concrete composite column is also provided with a third steel plate, both ends of the first steel plate and the third steel plate are in contact with the third steel plate, and the third steel plate and the third steel plate are parallel to the second steel plate; Both the upper flange and the lower flange of the steel girder are provided with ear plates, the ear plates are connected with the second steel plate and the third steel plate, and connecting angle steels are arranged symmetrically on both sides of the web plate of the steel beam.

The multi-cavity steel pipe concrete composite column includes hidden columns located at both ends, parallel webs are arranged between the two hidden columns, and the webs are connected by partitions.

Both the first steel plate and the second steel plate are welded to the multi-cavity steel pipe concrete composite column through weld seams.

The top of the upper flange of the steel beam is provided with two parallel ear plates along the length direction, and the bottom of the lower flange of the steel beam is provided with two parallel ear plates along the length direction.

The third steel plate, ear plate and connecting angle steel are all provided with holes, the ear plate is connected with the third steel plate through bolts, and the connecting angle steel is connected with the third steel plate through bolts.

The steel beam is an I-shaped steel beam.

The ends of the steel beams are provided with stiffeners.

Stiffening ribs are arranged between the third steel plate and the second steel plate.

Both the top and the bottom of the stiffener are provided with cover plates.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

(1) The utility model arranges the first steel plate and the second steel plate on both sides of the combined column, and arranges the third steel plate on the other side of the combined column, and the third steel plate is in contact with the end of the first steel plate, and the third steel plate is in contact with the end of the first steel plate. The second steel plate is parallel, and ear plates are arranged on the upper flange and the lower flange of the steel beam, and the ear plates are connected with the first steel plate and the third steel plate, and connecting angle steels are arranged symmetrically on both sides of the web of the steel beam, and the connecting angle steels are connected with the steel beams. The third steel plate is connected to complete the assembly of the eccentric column-beam joint. The connection mode and force transmission mode of the rigid joint joint between the multi-cavity steel pipe concrete column and the steel beam double-side plate in the utility model are unique. Because the beam end is separated from the column wall and the full-height side board usage. The physical isolation between the beam and the column changes the force transmission path of the traditional joint, eliminates the triaxial stress concentration, not only enables the plastic hinge to move outward from the joint to the beam, but also eliminates the tear damage and damage of the traditional joint column flange. Deficiencies in the dependency of the joint rotational capacity on the weak plate area of the column web. Meet the design and principles of "strong columns and weak beams, strong nodes and weak members".

(2) Due to the use of full-height double-sided slabs (i.e., the first steel plate and the second steel plate), the multi-cavity concrete-filled steel tube composite column maintains its integrity, making it more convenient to pour concrete inside the steel tube, and it is easy to ensure the quality of concrete pouring in the node area.

(3) Since the steel beam only transmits the bending moment and shear force to the first steel plate and the third steel plate through the ear plate and the connecting angle steel, the steel beam can be separated from the column end, which reduces the clear span of the steel beam and can reduce the The height of the steel beams meets the needs of residential users for residential functions.

(4) The joints of the utility model have a high degree of assembly. The multi-cavity steel pipe concrete composite column, steel plate, steel beam, ear plate, third steel plate and connecting angle steel can all be prefabricated in the factory, reducing the welding workload of installation, and on-site installation Just position the assembly. The node form is simple, the degree of assembly is high, and the installation is convenient and quick. Due to the avoidance of traditional penetration welding during on-site installation, traditional penetration welding tends to cause large welding residual stress on the steel, which makes the steel at the joints prone to delamination or brittle failure. The nodes of the utility model are all connected by high-strength bolts when installed on site, so the degree of assembly is high, and the node connections are reliable.

Furthermore, since the first steel plate, the second steel plate and the CFST composite column are only connected by welds on the outer column wall, and there are no welds inside the CFST, the structure of this joint is simple and the stress is reasonable compared with traditional joints.

Description of drawings

Fig. 1 is a schematic diagram of a prefabricated multi-cavity concrete-filled steel tube composite column; wherein, Fig. 1(a) to Fig. 1(e) are schematic diagrams of the assembly process of a multi-cavity concrete-filled steel tube composite column.

Figure 2 is a schematic diagram of a prefabricated steel beam. Among them, Fig. 2(a) to Fig. 2(c) are schematic diagrams of the assembly process of the steel beam.

Fig. 3 is a schematic diagram of assembly of the utility model. 3(a) to 3(c) are schematic diagrams of the overall assembly process.

Figure 4 is a schematic diagram of the yielding of the upper and lower flanges of the beam.

Figure 5 is a schematic diagram of the plastic hinge at the end of the beam.

Figure 6 is a schematic diagram of cover damage.

Figure 7 is a schematic diagram of the final destruction.

Figure 8 is a hysteresis curve diagram.

In the figure, 1 is the multi-cavity steel pipe concrete composite column, 2 is the steel beam, 3 is the first steel plate, 4 is the second steel plate, 5 is the third steel plate, 6 is the connecting angle steel, 7 is the lug plate, 8 is the stiffener, 9 is a cover plate.

detailed description

Below in conjunction with accompanying drawing the embodiment of the present utility model is described in detail: the present embodiment is implemented under the premise of the technical scheme of the present utility model, has provided detailed embodiment and concrete operation process, but the protection scope of the present utility model is not Limited to the following examples.

Referring to Fig. 3, the utility model includes a first steel plate 3 and a second steel plate 4 arranged on both sides of the multi-cavity steel pipe concrete composite column, that is, two steel plates are arranged on both sides of the multi-cavity steel pipe concrete composite column, wherein the first steel plate 3 Including the connected first steel plate, second steel plate and third steel plate, the first steel plate and the third steel plate are symmetrically arranged on both sides of the second steel plate, and the first steel plate and the third steel plate are arranged obliquely on the The two ends of the second steel plate and the other side wall of the multi-cavity steel pipe concrete composite column are also provided with a third steel plate 5, both ends of the first steel plate and the third steel plate are in contact with the third steel plate 5, and the third The section steel plate and the third steel plate 5 are all parallel to the second steel plate 4; the first steel plate 3 and the second steel plate 4 are all arranged on the multi-cavity steel pipe concrete composite column through fillet welds. Stiffeners 8 are arranged between the third steel plate 5 and the second steel plate 4 , and cover plates 9 are arranged at the top and bottom of the stiffeners 8 .

Two parallel ear plates 7 are arranged along the length direction on the top of the upper flange of the steel beam, and two parallel ear plates 7 are arranged along the length direction on the bottom of the lower flange of the steel beam; Holes are opened, the ear plate 7 on one side is connected to the third steel plate 5 by bolts, the ear plate 7 on the other side is connected to the second steel plate 4 by bolts, and the connecting angle steel 6 on the web side of the steel beam is connected to the third steel plate 5 by bolts. The three steel plates 5 are connected, and the connecting angle steel 6 on the other side of the web of the steel beam is connected with the second steel plate 4 through bolts.

The steel beam in the utility model is connected to the outstretched end of the second steel plate 4 on both sides of the multi-cavity steel pipe concrete composite column through the first steel plate, the second steel plate, the third steel plate and the lug plate.

The multi-cavity steel pipe concrete composite column in the utility model includes hidden columns located at both ends, parallel webs are arranged between the two hidden columns, and the webs are connected by partitions.

The steel beam is an I-shaped steel beam, and one end of the steel beam connected to the composite column is provided with a stiffener.

The above-mentioned assembling method for eccentric beam-column joints with side plate bolts, see Figure 1, pre-positions holes in the steel plates according to the design, and then fixes the first steel plate 3 and the second steel plate 4 to the multi-cavity steel pipe through welding seams On both sides of the concrete composite column, the third steel plate 5 is set on the other side wall of the multi-cavity steel pipe concrete composite column through the weld, so that the third steel plate 5 contacts with the two ends of the first steel plate 3, and the third steel plate 5 contacts with the first steel plate 3. The two steel plates 4 are parallel, and then a stiffening rib 8 is arranged between the third steel plate 5 and the second steel plate 4, and the stiffening rib 8 is spaced from the side wall of the multi-cavity steel pipe concrete composite column, and the top and bottom of the stiffening rib 8 are provided with cover plates 9. Obtain the prefabricated multi-cavity concrete-filled steel tube composite column; see Figure 2, first set two parallel lugs 7 along the length direction on the top of the upper flange of the steel beam, and set two parallel lugs 7 along the length direction at the bottom of the lower flange of the steel beam. The ear plate 7 of the steel girder is provided with connecting angle steel 6 symmetrically on both sides of the web plate of the steel beam, that is, a connecting angle steel 6 is arranged on one side of the web plate of the steel beam to obtain a prefabricated steel beam; referring to Fig. 3, the prefabricated multiple The concrete-filled steel tube composite columns and steel beams are transported to the site, the concrete is poured in the multi-cavity concrete-filled steel tube composite columns, and the prefabricated steel beams are hoisted to the joint area from top to bottom, and the lug plate 7 on one side is connected with the The third steel plate 5 is connected, the ear plate 7 on the other side is connected with the second steel plate 4 through bolts, the connecting angle steel 6 on one side of the web of the steel beam is connected with the third steel plate 5 through bolts, and the other side of the web of the steel beam The connecting angle steel 6 is connected with the second steel plate 4 through bolts, and the assembly is completed.

In the utility model, the first steel plate and the second steel plate can be prefabricated in the factory and welded on both sides of the multi-cavity steel pipe concrete composite column according to the positioning, and the third steel plate 5 is also arranged on the other side wall of the multi-cavity steel pipe concrete composite column. Prefabricate steel beams, lugs and connecting angle steels in the factory, and then weld the lugs to the upper and lower flanges of the steel beams in the factory according to the design size, and then open threaded holes on the lugs according to the design size to connect the joints. The angle steel is welded to the web of the steel beam according to the positioning size. The above process is prefabricated in the factory in advance, which saves the inconvenience of on-site production and improves the efficiency. During on-site installation, the steel beam is hoisted from top to bottom and positioned at the joint area, the steel plates connecting the angle steel and the two sides of the multi-cavity steel pipe concrete composite column are connected by installation screws, the ear plate is connected with the second steel plate and the third steel plate, and the steel plate is fixed. beam position.

The utility model node has two major innovations: the separation of the beam end from the column wall edge and the use of full-height side panels. The physical isolation between the beam and the column changes the force transmission path of the traditional joint, eliminates the triaxial stress concentration, not only enables the plastic hinge to move outward from the joint to the beam, but also eliminates the tear damage and damage of the traditional joint column flange. Deficiencies in dependence of joint rotational capacity on the weak plate area of the column web. Meet the design and principles of "strong columns and weak beams, strong nodes and weak members". At the same time, the node can be divided into two parts and prefabricated in the factory respectively. On-site installation only needs simple assembly, and the node structure is simple and highly assembling.

The failure modes of the utility model and the anti-seismic performance of the nodes are described below.

The mechanical properties of the new type of joints are described by taking multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid joints as a column. Using ABAQUS software to conduct finite element analysis on the joints, the joint column is a 200x600 multi-cavity concrete-filled steel pipe composite column, the beam is made of H350x150x6x10 welded I-beam, and the thickness of both side plates and cover plates at the joint is the same as that of the beam flange. The results of finite element analysis are as follows.

1. Destruction mode

The multi-cavity steel pipe concrete composite column-steel beam rigid connection node of the utility model adopts the multi-cavity steel pipe concrete composite column, the steel pipe has a strong restraint effect on the concrete, and the overall bearing capacity and ductility of the column body are relatively good, realizing Design requirements for strong columns and weak beams, strong nodes and weak members. The destruction sequence of the connecting nodes of the present invention is shown in Figures 4-7. (1) When the horizontal external force acts, the upper and lower flanges of the beam ends in the joint area first enter into plasticity, while the cover plate and side plate except a small part of the stress concentration area yield, the steel in most other areas is still in the elastic stage (as shown in Figure 4 ). (2) As the external force increases, plastic hinges first appear at the end of the beam before other parts (as shown in Figure 5). At this time, the steel in some areas of the cover plate yields and enters the plastic stage, while the side plate except for a small part of the stress concentration area, most of the Regional steel is still in the elastic phase. (3) Due to the strengthening effect of the steel material, when the external force load continues to increase, the steel plate in the connection area between the two sides of the cover plate and the side plate yields in shear, and the steel enters the plastic development stage. At this time, most of the joint side plate is still in the elastic stage , only a small part of the stress concentration of the steel plate yields (as shown in Figure 6). (4) As shown in Figure 7, as the load continues to increase, the structure eventually fails. At this time, the upper and lower flanges of the beam end buckle, but only part of the side plate enters the plastic stage, and most of the side plates in the joint area are still in the elastic stage .

2. Seismic performance of nodes

According to the principle of seismic concept design, the structure should have multiple seismic fortification lines to avoid the damage of the whole system due to the damage of some components. At the same time, it is also required that the structure should have the necessary strength, good deformation capacity and energy dissipation capacity. The rigid connection node of the utility model adopts the method of isolating the column and the beam end, and transmits the beam end bending moment and shear force through the node connector composed of the full-height side plate and the cover plate.

Due to the above failure sequence, when an earthquake acts, a plastic hinge first appears at the end of the beam, which consumes a certain amount of seismic energy, and then the cover plate shears and yields to further dissipate the seismic energy. , most are still in the elastic stage. The overall structure meets the design principle of "strong columns and weak beams, strong nodes and weak members".

Ductility refers to the ability of a structure to withstand inelastic deformation without a significant reduction in its bearing capacity before failure. In the seismic design of structures, the ductility index is an important characteristic. The interstory displacement angle of multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid joint is 7%-10%, which meets the requirements of my country's code.

When a structure is under seismic action, the structure has a continuous process of energy absorption and dissipation. When the structure enters the elastic-plastic state, its seismic performance mainly depends on the energy dissipation capacity of the components. The area enclosed by the curve in the loading stage in the hysteresis curve can reflect the amount of energy absorbed by the structure; while the area enclosed by the unloading curve and the loading curve is the dissipated energy. These energies are converted into heat energy and dissipated into space through internal friction or local damage of the material. The more energy that is dissipated, the less likely it is that the structure will fail. Due to the above-mentioned node failure sequence, the beam end and the cover plate successively dissipate a large amount of seismic energy, which finally ensures that the node has a better energy dissipation capacity. As shown in Figure 8, the hysteresis curve of the node is full, without obvious pinching phenomenon, and dissipates a large amount of seismic energy. The energy dissipation capacity of the node is good, and it has strong seismic performance.

Claims (7)

1. a kind of band side plate bolt node for eccentric beam column is it is characterised in that include being arranged on multi-cavity steel tube concrete group First steel plate (3) of zygostyle both sides and the second steel plate (4), wherein, first paragraph steel plate that the first steel plate (3) inclusion is connected, the Two-stage nitration steel plate and the 3rd section of steel plate, first paragraph steel plate and the 3rd section of steel plate are symmetricly set on second segment steel plate both sides, first paragraph steel Plate, the 3rd section of steel plate are inclined at the two ends of second segment steel plate, and the opposite side wall of multi-cavity steel tube concrete coupled column also sets It is equipped with the 3rd steel plate (5), first paragraph steel plate, the two ends of the 3rd section of steel plate are all contacted with the 3rd steel plate (5), the 3rd section of steel plate, Three steel plates (5) are all parallel with the second steel plate (4)；Otic placode (7), otic placode (7) and second are provided with girder steel top flange, lower flange Steel plate (4), the 3rd steel plate (5) are connected, and the web both sides of girder steel are symmetrically arranged with angle cleat (6)；

Described multi-cavity steel tube concrete coupled column includes the sleeper positioned at two ends, is provided with parallel abdomen between two sleeper Plate, is connected by dividing plate between web；

Described first steel plate (3), the second steel plate (4) are all welded on multi-cavity steel tube concrete coupled column by weld seam.

2. a kind of band side plate bolt node for eccentric beam column according to claim 1 is it is characterised in that described girder steel Top flange top arranges two parallel otic placodes (7) along its length, and girder steel lower flange bottom arranges two along its length Parallel otic placode (7).

3. a kind of band side plate bolt node for eccentric beam column according to claim 1 is it is characterised in that the described 3rd Hole is all offered on steel plate (5), otic placode (7) and angle cleat (6), otic placode (7) is connected by bolt with the 3rd steel plate (5), even Connect angle steel (6) to be connected by bolt with the 3rd steel plate (5).

4. a kind of band side plate bolt node for eccentric beam column according to claim 1 is it is characterised in that described girder steel For steel I-beam.

5. a kind of band side plate bolt node for eccentric beam column according to claim 4 is it is characterised in that described girder steel End be provided with ribbed stiffener.

6. a kind of band side plate bolt node for eccentric beam column according to claim 1 is it is characterised in that the described 3rd It is provided with ribbed stiffener between steel plate (5) and the second steel plate (4).

7. a kind of band side plate bolt node for eccentric beam column according to claim 6 is it is characterised in that described put more energy into Rib top and bottom are provided with cover plate (9).