CN205712476U - A kind of dual-sided board bolt joint for beam column - Google Patents

Abstract

A kind of dual-sided board bolt joint for beam column is identical including the first steel plate being symmetrically welded in multi-cavity steel tube concrete coupled column both sides and the second steel plate, the first steel plate and the second steel plate structure；First steel plate includes first paragraph steel plate, second segment steel plate, the 3rd section of steel plate and the 4th section of steel plate, first paragraph steel plate and the 3rd section of steel plate symmetry are inclined at second segment steel plate both sides, and first paragraph steel plate, the end of the 3rd section of steel plate are provided with the 4th section of steel plate paralleled with second segment steel plate；Being provided with otic placode, otic placode and the 4th section of steel plate on girder steel top flange, lower flange to be connected, the web lateral symmetry of girder steel is provided with angle cleat.Node assemblingization degree of the present utility model is high, and multi-cavity steel tube concrete coupled column, steel plate, girder steel, otic placode and angle cleat all can be prefabricated in the factory, and reduces the welding job amount installed, and in-site installation only need to position assembling.Joint form is simple, and assemblingization degree is high, quick and easy for installation.

Description

A double-sided plate bolt joint for 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 double-side plate bolt joint used for 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 double-side plate bolt joint for 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 columns and weak beams, strong joints and weak joints". Based on the design principle of "component", 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 double-folded plate bolt connection node for beam-column, comprising a first steel plate and a second steel plate symmetrically welded on both sides of a multi-cavity steel pipe concrete composite column, the first steel plate and the second steel plate have the same structure; the first steel plate includes the second steel plate The first steel plate, the second steel plate, the third steel plate and the fourth steel plate, the first steel plate and the third steel plate are arranged symmetrically and obliquely on both sides of the second steel plate, and the ends of the first steel plate and the third steel plate are There is a fourth section of steel plate parallel to the second section of steel plate; ear plates are provided on the upper and lower flanges of the steel beam, and the ear plates are connected with the fourth section of steel plate, and the web of the steel beam is symmetrically arranged on both sides. Connect angle iron.

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 fourth steel plate, the ear plate and the connecting angle steel are all provided with holes, the ear plate is connected with the fourth steel plate through high-strength bolts, and the connecting angle steel is connected with the fourth steel plate through high-strength bolts.

The steel beam is an I-shaped steel beam, and the ends of the steel beam are provided with stiffeners.

The fourth steel plate of the first steel plate is arranged parallel to the fourth steel plate of the second steel plate, and a stiffener is arranged between the fourth steel plate of the first steel plate and the fourth steel plate of the second steel plate.

The two ends of the stiffener are also connected with the ends of the first section of the steel plate of the first steel plate and the first section of the steel plate of the second steel plate.

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

(1) The utility model sets the first steel plate and the second steel plate with the same structure on both sides of the combined column, and sets the lug plate on the upper flange and the lower flange of the steel beam, and the fourth steel plate of the first steel plate is inserted into the second steel plate. Steel beams are set between the stiffeners of the steel plates, and the ear plates are connected with the fourth steel plate of the first steel plate and the fourth steel plate of the second steel plate, and the connecting angle steel is symmetrically arranged on both sides of the web of the steel beam to complete the column-beam joint The assembly of the multi-cavity steel pipe concrete column and the double side plate of the steel beam in the utility model is unique in the rigid connection node connection mode and force transmission mode, due to the separation of the beam end from the column wall and the use of the full height side plate. 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 fourth steel plate through the fourth steel plate, lug plate and connecting angle steel, the steel beam can be separated from the column end, reducing the net span of the steel beam , can reduce the height of steel beams to a certain extent, and meet 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 and connecting angle steel can all be prefabricated in the factory, reducing the welding workload of installation, and the on-site installation only needs to be positioned and assembled . 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, this type of joint is suitable for the case where the column width is much larger than the beam width.

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 the schematic diagram of prefabricated multi-cavity concrete filled steel tube composite column;

Figure 2 is a schematic diagram of a prefabricated steel beam.

Fig. 3 is a schematic diagram of assembly of the utility model.

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 fourth steel plate, 6 is the connecting angle steel, 7 is the lug plate, and 8 is the stiffener .

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 the first steel plate 3 and the second steel plate 4 welded on both sides of the multi-cavity steel tube concrete composite column, that is, the two steel plates are arranged on both sides of the multi-cavity steel tube concrete composite column, the first steel plate 3 and the second steel plate The two steel plates 4 are arranged symmetrically, and the first steel plate 3 and the second steel plate 4 have the same structure. Wherein, the first steel plate 3 comprises a first section steel plate, a second section steel plate, a third section steel plate and a fourth section steel plate 5, the first section steel plate and the third section steel plate are arranged symmetrically on both sides of the second section steel plate, and the first The section steel plate and the third section steel plate are obliquely arranged at the two ends of the second section steel plate, and the ends of the first section steel plate and the third section steel plate are all provided with a fourth section steel plate 5 parallel to the second section steel plate; 3 and the second steel plate 4 are installed on the multi-cavity steel pipe concrete composite column through fillet welds, the fourth steel plate of the first steel plate 3 is set in parallel with the fourth steel plate of the second steel plate 4, and the fourth steel plate of the first steel plate Stiffeners 8 are arranged between the section steel plate and the fourth section steel plate of the second steel plate 4, and both ends of the stiffener 8 are also connected with the ends of the first section steel plate of the first steel plate and the first section steel plate of the second steel plate.

The top of the upper flange of the steel beam is provided with two parallel ear plates 7 along the length direction, and the bottom of the lower flange of the steel beam is provided with two parallel ear plates 7 along the length direction; the fourth steel plate of the first steel plate, the second steel plate of the second steel plate There are holes in the four-segment steel plate, ear plate 7 and connecting angle steel 6, the ear plate 7 on one side of the steel beam is connected with the fourth steel plate 5 of the first steel plate by high-strength bolts, and the ear plate 7 on the other side is connected by high-strength bolts Connected with the fourth steel plate of the second steel plate 4, the connecting angle steel 6 on the web side of the steel beam is connected with the fourth steel plate 5 of the first steel plate through bolts, and the connecting angle steel 6 on the other side of the web of the steel beam is passed The bolt is connected with the fourth section steel plate of the second steel plate 4 .

In the utility model, the steel beam is connected to the extended ends of the steel plates on both sides of the multi-cavity steel pipe concrete composite column through the fourth steel plate of the first steel plate, the fourth steel plate of the second steel plate, and the lug plate.

The angles formed by the first steel plate, the third steel plate and the second steel plate are set according to the specific size of the beam.

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

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

The above-mentioned assembly method for double-sided plate bolt joints of beams and columns, referring to Fig. 1, welds the first steel plate 3 and the second steel plate 4 on both sides of the multi-cavity steel pipe concrete composite column through weld seams, the first steel plate 3 and the second steel plate 4 The second steel plate 4 is arranged symmetrically and has the same structure. According to the design, threaded holes are opened on the fourth steel plate of the first steel plate and the stiffener of the second steel plate. The fourth steel plate 5 is parallel to the second steel plate 4, and then the fourth A stiffener 8 is set between the segment steel plate 5 and the second steel plate 4 to obtain a prefabricated multi-cavity concrete-filled steel tube composite column; referring to Fig. 2, two parallel lug plates 7 are first arranged along the length direction on both sides of the upper flange of the steel beam, Two parallel lugs 7 are arranged along the length direction on both sides of the lower flange of the steel beam, and connecting angle steels 6 are arranged symmetrically on both sides of the web of the steel beam, that is, one connecting angle steel 6 is arranged on one side of the web of the steel beam to obtain a prefabricated Good steel beams; see Figure 3, then transport the prefabricated multi-cavity concrete-filled steel pipe composite columns and steel beams to the site, pour concrete into the multi-cavity steel pipe concrete composite columns, and then place the prefabricated steel beams from top to bottom Hoist to the node area, connect the ear plate 7 on one side of the steel beam with the fourth steel plate 5 of the first steel plate through high-strength bolts, and connect the ear plate 7 on the other side with the fourth steel plate of the second steel plate 4 through high-strength bolts The connecting angle steel 6 on one side of the web of the steel beam is connected with the fourth steel plate 5 of the first steel plate through high-strength bolts, and the connecting angle steel 6 on the other side of the web of the steel beam is connected with the fourth steel plate 4 of the second steel plate through high-strength bolts. The steel plates are connected to complete the assembly.

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. 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, and the ear plate is connected with the fourth steel plate of the steel plates on both sides. Fix the position of the steel beam.

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 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". 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 (8)

1. the dual-sided board bolt joint for beam column, it is characterised in that include being symmetrically welded in multi-cavity steel tube concrete group First steel plate (3) of zygostyle both sides and the second steel plate (4), the first steel plate (3) is identical with the second steel plate (4) structure；First steel plate (3) first paragraph steel plate, second segment steel plate, the 3rd section of steel plate and the 4th section of steel plate (5), first paragraph steel plate and the 3rd section of steel plate are included Symmetry is inclined at second segment steel plate both sides, and first paragraph steel plate, the end of the 3rd section of steel plate are provided with and second segment steel plate The 4th section of parallel steel plate (5)；Otic placode (7), otic placode (7) and the 4th section of steel plate it is provided with on girder steel top flange, lower flange (5) being connected, the web lateral symmetry of girder steel is provided with angle cleat (6).

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that described multi-cavity steel tube Concrete combination column includes the sleeper being positioned at two ends, is provided with parallel web between two sleeper, between web by every Plate connects.

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that described first steel plate (3), the second steel plate (4) is all welded on multi-cavity steel tube concrete coupled column by weld seam.

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that described girder steel upper limb Edge top arranges two parallel otic placodes (7) along its length, arrange along its length bottom girder steel lower flange two equal The otic placode (7) of row.

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that described 4th section of steel All offering porose on plate (5), otic placode (7) and angle cleat (6), otic placode (7) and the 4th section of steel plate (5) are by high-strength bolt phase Even, angle cleat (6) is connected by high-strength bolt with the 4th section of steel plate (5).

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that described girder steel is work Word girder steel, and the end of girder steel is provided with ribbed stiffener.

A kind of dual-sided board bolt joint for beam column the most according to claim 1, it is characterised in that the first steel plate (3) The 4th section of steel plate and the 4th section of steel plate of the second steel plate (4) be arranged in parallel, and the 4th section of steel plate of the first steel plate (3) and It is provided with ribbed stiffener between 4th section of steel plate of two steel plates (4).

A kind of dual-sided board bolt joint for beam column the most according to claim 7, it is characterised in that described ribbed stiffener Also end with the first paragraph steel plate of the first steel plate, the first paragraph steel plate of the second steel plate, two ends is connected.