CN104563304A - Joint for connecting buckling-restrained brace, concrete beam and concrete column - Google Patents

Abstract

A connection node between buckling restrained braces and concrete beams and columns, the anchors anchored in the concrete beams and columns are composed of two sets of H-shaped steels spaced apart from each other, the H-shaped steels are welded together with the anchor plate, and the inner edge of the anchor plate is between the concrete beam and the concrete column The outer side of the gusset plate and the anchor plate are welded together; the outer end of the anchor plate welded together with the gusset plate is longer than the side of the gusset plate; there are bolt holes on the gusset plate to fix the buckling restraint support. The H-shaped steel of the gusset plate has good stability in the plane, high rigidity, and is not easy to lose stability; the welding area between the steel and the anchor plate is large, and it is not easy to be damaged by drawing; the contact force transmission area between the steel and concrete is large, and the force can be evenly distributed to the concrete In the beam; the extended parts at both ends of the anchor plate can avoid direct extrusion between the gusset plate and the concrete, reduce stress concentration, and prolong the service life of the joint; the integrity of the concrete beam and column is not affected, which facilitates the arrangement of stirrups and longitudinal bars; the joint area of the beam and column contains steel The anchor plate constrains the plastic deformation of the beam, which improves the strength and stiffness of the joint; the entire component can be manufactured in the factory, saving construction time.

Description

A connection node between buckling-restrained braces and concrete beams and columns

technical field

The invention relates to a building structure, in particular to a connection node between a buckling-constrained support and a concrete beam and column.

Background technique

Concrete frame structures with buckling-restrained braces are being popularized and applied in the field of construction due to their advantages in seismic performance, simple construction, and saving raw materials. Among them, the connection node between the buckling restraint support and the concrete frame is a very important link in the whole structure, which requires sufficient strength, appropriate stiffness, and sufficient rotation capacity to transmit shear force and bending moment reasonably; at the same time, it should be easy to manufacture and convenient construction. A good node should conform to the design principle of "strong node, weak component".

The existing buckling-restrained braces and concrete beams and columns are as follows:

One is a stud type anchor connection node (such as the node disclosed in the CN102011434A patent application). It uses a whole steel plate as the node member, and the part of the steel plate anchored in the concrete beam and column is interspersed with multiple studs transversely to form the anchor, and the part exposed outside the concrete beam and column is used as the node plate fixedly connected with the buckling restraint support. The disadvantage of this kind of joint is: the whole steel plate cuts the concrete beam and column into two halves, which weakens the integrity of the concrete beam and column and reduces the strength; Concrete beams and columns are split; when tying concrete beams and column stirrups, the steel plate becomes an obstacle, which is inconvenient for construction.

The other is to change the steel plate with the peg in the above-mentioned peg-type anchor connection node into a shaped steel plate with vertical ribs. This kind of joint still uses an integral steel plate as the joint member, and its disadvantages are the same as those of the above-mentioned stud-type anchor connection joint.

The third type is the angle steel anchor connection node. It uses two sets of vertical angle steel welded with the anchor plate as anchors to be anchored in concrete beams and columns, and the joint plate and the anchor plate are welded into one. The disadvantages of this kind of joint are: the symmetry and stability of the angle steel are poor; the welding area between the angle steel and the anchor plate is small, and it is easy to cause drawing damage during the stress process; the contact force transmission area between the angle steel and concrete is small, and the joint strength is poor.

The fourth type is the anchor bar type anchor connection node. It is to replace the angle steel in the angle steel type anchor connection node with a vertical anchor bar. The disadvantages of this kind of joint are: the stability of the anchor bar is poor; the welding area between the anchor bar and the anchor plate is small, and it is easy to cause pullout damage during the stress process; the contact force transmission area between the anchor bar and the concrete is small, and the joint strength is poor.

Contents of the invention

The purpose of the present invention is to improve the above-mentioned shortcomings of the prior art, and provide a connection node between buckling-restrained braces and concrete beams and columns that can better transmit bending moment and shear force, meet the bearing capacity requirements, and facilitate construction.

In order to achieve the above object, the connection node between the buckling restrained support and the concrete beam and column provided by the present invention is composed of anchors anchored in the concrete beam and concrete column and a gusset plate placed outside the concrete beam and concrete column; the anchor is composed of Two sets of H-shaped steels spaced apart from each other (the number of H-shaped steels contained in each group is determined according to the actual bearing capacity requirements), and the two sets of H-shaped steels are respectively welded with the anchor plate, and the inner edge of the anchor plate is on the outside of the concrete beam and concrete column ; The gusset plate is welded together with the anchor plate at the top of the concrete beam and the inner side of the concrete column; the outer end of the anchor plate welded with the gusset plate is 100mm longer than the side of the gusset plate; Bolt holes for fixed connections.

If necessary, a vertical stiffener can be provided at the center of the gusset plate.

Compared with prior art, the advantages of the present invention are:

1. H-shaped steel has high stability and rigidity in the plane where concrete beams and columns are located, and is not easy to lose stability.

2. The welding area between the H-shaped steel and the anchor plate is large, and it is not easy to cause drawing damage during the stress process.

3. The contact force transmission area between H-shaped steel and concrete is relatively large, which can evenly distribute the force to concrete beams and columns.

4. The extended part of the end of the anchor plate welded together with the gusset plate can effectively avoid the direct extrusion between the gusset plate and the concrete, reduce the stress concentration and prolong the service life of the joint.

5. There are gaps between H-shaped steels, so that the integrity of concrete beams and columns is not affected; it is convenient for the arrangement of stirrups and longitudinal bars of concrete beams and columns.

6. The steel content of concrete beams and columns increases in the joint area, and the anchor plate can restrain the plastic deformation of the beam to a certain extent, thereby improving the strength and stiffness of the joint, which conforms to the design principle of "strong joints, weak members".

7. The entire node component can be manufactured in the factory and installed on site, saving construction time and improving engineering efficiency.

Description of drawings

The accompanying drawings are schematic structural diagrams of an embodiment of the present invention, wherein Fig. 1 is a front view of the embodiment; Fig. 2 is a perspective view of the node member in Fig. 1 .

In the figure: 1—concrete beam; 2—concrete column; 3—anchor plate; 4—H-shaped steel; 5—node plate; 6—bolt hole; 7—stiffener.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

Referring to Fig. 1 and Fig. 2, the connection nodes between the buckling-constrained brace and the concrete beam and column in this embodiment are composed of anchors anchored in the concrete beam 1 and concrete column 2 and a gusset plate 5 placed outside the concrete beam and concrete column. The anchor piece anchored in the concrete beam 1 is composed of three H-shaped steels 4 spaced apart from each other, and the anchor piece anchored in the concrete column 2 is composed of five H-shaped steels 4 spaced apart from each other. 3 are welded together, the inner edge of the anchor plate 3 is on the outside of the concrete beam 1 and the concrete column 2; The outer end of the anchor plate welded integrally with the gusset plate is 100mm longer than the side of the gusset plate; bolt holes 6 for buckling restraint support and fixed connection are processed on the gusset plate 5 . A vertical stiffener 7 is provided at the center of the gusset plate 5 .

In the factory, the above joint components are pre-fabricated, the joints are placed at the joint positions of concrete beams and columns, steel bars are bound, fixed with formwork, concrete is poured, and finally the friction-type high-strength bolts are passed through the bolt holes on the joint plate to complete the connection with the buckling restraint support. Fixed connection.

Claims (2)

1. A connection node between a buckling-restrained support and a concrete beam and a column, consisting of an anchor member anchored in a concrete beam (1) and a concrete column (2) and a gusset plate (5) placed outside the concrete beam and the concrete column; it It is characterized in that: the anchor piece is composed of two sets of H-shaped steels (4) spaced apart from each other, and the two sets of H-shaped steels (4) are welded together with the anchor plate (3) respectively, and the inner edge of the anchor plate (3) is in the concrete beam ( 1) and the outside of the concrete column (2); the gusset plate (5) is welded together with the anchor plate positioned at the top of the concrete beam and the inside of the concrete column; the outer end ratio of the anchor plate (3) welded into one with the gusset plate The side of the gusset plate (5) is lengthened by 100 mm; there are bolt holes (6) on the gusset plate (5) for the fixed connection of the buckling restraint support. 2. The connection node between buckling restrained braces and concrete beams and columns according to claim 1, characterized in that: a vertical stiffener (7) is provided at the center of the gusset plate (5).