CN113622517B

CN113622517B - Beam end hinged connecting assembly bearing axial force in high-rise building

Info

Publication number: CN113622517B
Application number: CN202110655458.0A
Authority: CN
Inventors: 龚铭; 胡凌华; 何亮; 徐浩翔
Original assignee: Goa Architecture Design Co ltd
Current assignee: Goa Architecture Design Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-08-19
Anticipated expiration: 2041-06-11
Also published as: CN113622517A

Abstract

The invention relates to the field of construction. The connecting assembly comprises a cross steel plate, one end of the cross steel plate is welded on the vertical steel rib of the lateral force resisting component, and the other end of the cross steel plate is welded with an end plate; the end faces of the cross-shaped steel plate positioned at the upper side and the lower side are provided with first connecting plates which can be removed, and first bolt holes are formed in the first connecting plates; a second connecting plate which can be removed is arranged at the end part of the first flange plate of the axial force beam, and a second bolt hole is formed in the second connecting plate; the connecting assembly further comprises an auxiliary plate, and at least two third bolt holes are formed in the auxiliary plate. The invention can improve the rotation capability of the beam end of the hinge shaft force beam and greatly reduce the sectional area loss of the beam end node.

Description

Beam end hinged connecting assembly bearing axial force in high-rise building

Technical Field

The invention relates to the field of buildings, in particular to an articulated beam structure.

Background

In multi-storey or high-rise buildings, when the vertical elements of the external frame are angled at the floor, the beams at this floor can take up a large axial force (compression or tension); the axial force needs to be transmitted to the core barrel lateral force resisting component of the building through the beam; therefore, the beam that transmits the axial force (axial force beam) plays a key role in maintaining the load-bearing capacity of the turning vertical member. Meanwhile, in order to overcome the problem of poor deformation of the frame and the core barrel, one end or two ends of the axial force beam adopt hinged joints.

The existing axial force beam is mostly composed of a web plate and flange plates connected to two ends of the web plate. When the existing axial force beam is connected with the lateral force resisting component, the multiple webs are welded or bolted, and the flange plates are not connected, as shown in figure 1 or figure 2. The following problems are prevalent:

1. the existing connection mode is close to semi-rigid connection, the rotational deformation capacity of a node is greatly limited, the difference between the actual rotational performance and the rotational performance in the design hypothesis is large, and the difference between the actual stress of a component and the theoretical analysis stress result is large; when the vertical deformation difference existing at the two ends of the axial force beam is large, the existing connecting mode cannot complete enough rotation quantity, and steel plate yield or weld joint cracking in a node area is easily caused.

2. For the beam with wider flange and smaller web height, the beam end adopts the mode that the web is not connected with the flange, so that the loss of a large section area can be caused, the net section area of the beam is only half or less than the area of the rough section, and the beam end node becomes an obvious weak part and does not meet the basic requirement of a strong node and a weak component in the anti-seismic design.

Disclosure of Invention

The present invention aims to solve the above problems by providing a beam-end hinged connection assembly for bearing axial forces in high-rise buildings.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

the beam end hinged connection assembly for bearing axial force in a high-rise building comprises vertical steel ribs and an axial force beam in a lateral force resisting component, wherein the axial force beam comprises a vertical web plate positioned in the vertical direction and first flange plates connected to two ends of the vertical web plate, and the first flange plates are positioned in the horizontal direction;

the end faces of the cross-shaped steel plate positioned at the upper side and the lower side are provided with first connecting plates which can be removed, and first bolt holes are formed in the first connecting plates; a second connecting plate which can be removed is arranged at the end part of the first flange plate of the axial force beam, and a second bolt hole is formed in the second connecting plate;

the connecting assembly further comprises an auxiliary plate, and at least two third bolt holes are formed in the auxiliary plate.

Preferably, at least one third bolt hole in the auxiliary plate faces the first bolt hole in the first connecting plate, at least one third bolt hole faces the second bolt hole in the second connecting plate, and a bolt is inserted into the facing bolt hole, so that the end plate and the end portion of the axial force beam are fixed.

Preferably, the end plate and the end of the axial force beam are welded together.

Preferably, the cross steel plate is welded with side plates in the vertical direction on the end faces of the front side and the rear side, one end of each side plate is welded on the vertical steel rib of the lateral force resisting component, and the other end of each side plate is welded on the end plate. Thereby reinforcing the strength of the connecting assembly.

Further preferably, the cross steel sheet comprises the riser that is located vertical direction and the diaphragm that is located the horizontal direction, the riser with be equipped with the reinforcing plate between the curb plate, the one end welding riser of reinforcing plate, the other end welding curb plate of reinforcing plate. Thereby further strengthening the connection assembly.

Preferably, the axial force beam further comprises a horizontal web plate located in the horizontal direction, and the horizontal web plate is crossed with the vertical web plate, so that the longitudinal section of the integral structure formed by the vertical web plate and the horizontal web plate is in a cross shape. Thereby balancing the shaft forces with the horizontal webs.

Has the advantages that: the invention improves the structure of the axial force beam on the basis of the existing articulated beam structure bearing the axial force in the high-rise building, and simultaneously connects the axial force beam with the lateral force resisting member through the connecting component to improve the rotating capability of the beam end of the articulated axial force beam, so that the actual stress of the member is closer to the design analysis result, the sectional area loss of the beam end node is greatly reduced, and the matching of the bearing capacity of the articulated node and the bearing capacity of the member is realized.

Drawings

Fig. 1 is a schematic view of a conventional articulated beam structure;

FIG. 2 is another schematic view of a prior art articulated beam structure;

FIG. 3 is a longitudinal cross-sectional view of one construction of the axial force beam of the present invention;

FIG. 4 is a longitudinal cross-sectional view of another construction of the axial force beam of the present invention;

FIG. 5 is a partial longitudinal cross-sectional view of one construction of the connection assembly of the present invention;

FIG. 6 is a partial longitudinal cross-sectional view of another construction of a connecting assembly of the present invention;

FIG. 7 is a partial longitudinal cross-sectional view of another construction of the connection assembly of the present invention;

FIG. 8 is a schematic view of the components of the present invention as they are connected;

FIG. 9 is a schematic view of an embodiment of the axial force beam of the present invention;

FIG. 10 is a schematic view of one configuration of the side force resisting member and connection assembly of the present invention;

FIG. 11 is a schematic view of the components of the present invention after they are connected;

FIG. 12 is a schematic view of one end face of the end plate;

FIG. 13 is a schematic view of another embodiment of the axial force beam of the present invention;

FIG. 14 is a schematic structural view of a connection assembly and a side force resisting member employing the end plate of FIG. 13;

FIG. 15 is a stress cloud of the present invention;

FIG. 16 is a graph comparing the M-theta curves of the nodes before and after the improvement.

Fig. 17 is a centroid diagram of the connection assembly of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, fig. 12, fig. 13 and fig. 14, the beam end hinged connection assembly bearing axial force in a high-rise building comprises a vertical steel rib of a lateral force resisting member, an axial force beam and a connection assembly.

Detailed description of the preferred embodiment 1

The axial force roof beam is by being located vertical web 1 on the vertical direction, connecting the first flange board 2 at vertical web 1 both ends, and first flange board 2 is located the horizontal direction, wholly is "worker" word form.

The connecting assembly comprises a cross steel plate 7 with a cross-shaped longitudinal section, one end of the cross steel plate 7 is welded on the vertical steel rib 15 of the lateral force resisting component, and the other end of the cross steel plate 7 is welded with an end plate 14. Preferably, the cross steel plate 7 has a height from the riser in the vertical direction equal to the height of the vertical web 1, but less than the height of the end plate 14.

The end surfaces of the cross-shaped steel plate 7 positioned at the upper side and the lower side are provided with first connecting plates 9, and the first connecting plates 9 are provided with first bolt holes 8; the first flange plate 2 of the axial force beam is provided with a second connecting plate 3 at the end part, and the second connecting plate 3 is provided with a second bolt hole 4. The connecting assembly further comprises an auxiliary plate 13, and at least two third bolt holes are formed in the auxiliary plate 13.

When the auxiliary plate is used, the end plate of the connecting assembly and the end part of the axial force beam are temporarily fixed together through the auxiliary plate by means of bolts, at least one third bolt hole in the auxiliary plate is over against the first bolt hole in the first connecting plate 9, at least one third bolt hole is over against the second bolt hole 4 in the second connecting plate 3, and bolts are inserted into the over-against bolt holes, so that the end plate and the end part of the axial force beam are fixed. Then, welding is performed again to weld the end portions of the end plates and the axial force beam together, and only the end portion of the vertical web 1 may be welded, or the end portion of the first flange plate 2 may be welded at the same time as the end portion of the vertical web 1 is welded. And finally, removing the auxiliary plate, and performing secondary use on the auxiliary plate, or directly using the auxiliary plate as a component of the next articulated beam structure. First connecting plate 9, second connecting plate 3 can separate and remove, carry out the steel material and retrieve.

Specific example 2

The axial force beam is composed of a vertical web plate 1 located in the vertical direction and first flange plates 2 connected to two ends of the vertical web plate 1, and the first flange plates 2 are located in the horizontal direction. The axial force beam also comprises a horizontal web 5 in the horizontal direction, and the horizontal web 5 is crossed with the vertical web 1, so that the longitudinal section of the integral structure formed by the vertical web 1 and the horizontal web is in a cross shape. The longitudinal section of the whole axial force beam is in a king shape. The added horizontal web can effectively increase the area of the end of the axial force beam, thereby increasing the area of the net section of the beam end node.

The connecting assembly comprises a cross-shaped steel plate 7 with a cross-shaped longitudinal section, one end of the cross-shaped steel plate 7 is welded on the vertical steel rib of the lateral force resisting component, and the other end of the cross-shaped steel plate 7 is welded with an end plate. The end surfaces of the cross-shaped steel plate 7 positioned at the upper side and the lower side are provided with first connecting plates 9, and the first connecting plates 9 are provided with first bolt holes; the end of the first flange plate 2 of the axial force beam is provided with a second connecting plate 3, and the second connecting plate 3 is provided with a second bolt hole 4. The connecting assembly further comprises an auxiliary plate, and at least two third bolt holes are formed in the auxiliary plate.

When the auxiliary plate is used, the end plate of the connecting assembly and the end part of the axial force beam are temporarily fixed together through the auxiliary plate by means of bolts, at least one third bolt hole in the auxiliary plate is over against the first bolt hole in the first connecting plate 9, at least one third bolt hole is over against the second bolt hole 4 in the second connecting plate 3, and bolts are inserted into the over-against bolt holes, so that the end plate and the end part of the axial force beam are fixed. Then, welding is performed again, so that the end plate and the end portion of the axial force beam are welded together, wherein the end portion of the axial force beam mainly refers to the end portion of the vertical web 1 and the end portion of the horizontal web. And finally, removing the auxiliary plate, and performing secondary use on the auxiliary plate, or directly using the auxiliary plate as a component of the next articulated beam structure. First connecting plate 9, second connecting plate 3 can separate and remove, carry out the steel material and retrieve.

In the two embodiments, the cross steel plate 7 has four limbs, two limbs extending forward and backward are respectively welded with a side plate 10 in the vertical direction, one end of the side plate 10 is welded on the vertical steel rib of the lateral force resisting component, and the other end of the side plate 10 is welded on the end plate. Thereby reinforcing the strength of the coupling assembly. In order to further increase coupling assembling's intensity, cross steel sheet 7 comprises the diaphragm that is located ascending riser of vertical side and is located the horizontal direction, is equipped with reinforcing plate 11 between riser and the curb plate, and the one end welding riser of reinforcing plate 11, the other end welding curb plate of reinforcing plate. Preferably, the cross section of the whole body formed by the side plates, the vertical plates, the reinforcing plates, the end plates and the vertical steel ribs of the lateral force resisting components is shaped like a Chinese character 'tian'. Thereby balancing the forces on each side.

In the above two embodiments, referring to fig. 13, the length of the vertical web 1 is preferably longer than the length of the other components of the axle beam, so that the end of the vertical web 1 is exposed at the end of the other components of the axle beam except the vertical web 1. Referring to fig. 12 and 14, a strip-shaped groove 12 is formed in one side, facing the axial force beam, of the end plate, the strip-shaped groove 12 is arranged in the vertical direction, an upper end opening of the strip-shaped groove 12 and one side, facing the axial force beam, of the strip-shaped groove 12 are also opened, and the vertical web plate 1 is inserted from the upper end opening of the strip-shaped groove and slides into the strip-shaped groove. Therefore, the contact area of the two sides is further increased, and meanwhile, the limit and the support are better carried out in the bolt fixing link and the welding link of the vertical web plate 1 and the axial force beam. The width of the strip-shaped groove is 4-8 mm larger than the thickness of the web plate, so that the web plate can be conveniently inserted, and meanwhile, the welding agent can be conveniently fed. The lower end of the strip-shaped groove is preferably not provided with an opening, so that the vertical web 1 is supported by the lower end of the strip-shaped groove.

In the embodiment 2, two ends of the horizontal web 5 are respectively provided with a second flange 6, and the second flanges are located in the vertical direction, see fig. 4, so that the second flanges are used for balancing the force. More crucial is after increasing the second flange board, has reduced the axial force of first flange board 2's undertaking, is favorable to the transition of axial force to coupling assembling, moreover, the moment of inertia of cross-section around X axle and around Y axle differs a little under this structure, accords with the cross-section design requirement of axial force control.

The construction method comprises the following steps:

the components of the connecting assembly are integrally connected by welding at the factory, and the length L of the whole (the distance from the side surface of the end plate on the side away from the cross steel plate to the end surface of the cross steel plate on the side away from the end plate) is preferably 300 mm to 800 mm. The lateral force resisting member can be a concrete wall or a vertical supporting structure, a vertical steel rib is arranged in the lateral force resisting member, and the connecting component and the vertical steel rib are welded into a whole in a factory. During on-site construction, splicing is firstly carried out: fixing the two connecting plates by bolts to temporarily position the axial force beam and the connecting assembly; then, welding and connecting the flange plate, the vertical web plate and the horizontal web plate of the axial force beam with the end plate to integrally connect the axial force beam and the connecting assembly; and then, cutting off the connecting plate from the axle beam hinged structure to complete the installation. The advantages of the on-site welding of the connecting component and the axial force beam are that the rotating area of the node can be avoided, and the on-site welding seam can not generate cracks due to the deformation of the node.

Description of the principle:

the common flexural beam component transfers bending moment through flanges and transfers shearing force through webs; the hinged beam end means that the node only transmits shearing force and does not transmit bending moment. The traditional method of beam end hinge joint is usually realized by connecting a web plate with a gusset plate through bolts and disconnecting a flange plate (figure 1), wherein the gusset plate is connected with vertical steel ribs in a welding way. The traditional method for hinging the beam end of the transmission axial force beam is that a web plate is connected with a gusset plate through a small number of bolts for positioning, the web plate is welded with a double-sided gusset plate on site, and a flange plate is not connected (figure 2), wherein the gusset plate is welded with vertical steel ribs. According to the method of fig. 2, the following problems are difficult to solve: a. because the web plates are connected in a welding mode instead of bolts, the rotary deformation capacity of the joint is greatly limited even under the condition that the flange plates are not connected, the hinge joint with the complete rotary performance in the construction mode and the design assumption has large difference, and the actual stress and the theoretical analysis result of the component have large difference; further detailed analysis and simulation prove that the traditional connection mode is closer to semi-rigid connection; in a high-rise building, when the vertical deformation difference existing at two ends of an axial beam is large, the semi-rigid connection cannot complete enough rotation, and steel plates in a node area are easy to yield or weld seams are easy to crack. b. For the beam with wider flange and smaller web height, the beam end adopts the mode that the web is connected with the flange and is not connected, so that the loss of a large section area can be caused, the net section area of the beam is only half or less of the area of the rough section, and the beam end node becomes an obvious weak part and does not accord with the basic requirement of a strong node weak component in the anti-seismic design.

The connecting component with the length of L is reserved at the position of the beam end node, the section of the connecting component is basically cross-shaped, the connecting component has smaller rotational rigidity, and can meet the rotational requirement of small deformation of a building structure, so that the structural structure can meet the design assumption. In addition, the axial force beam is provided with a horizontal web plate and a second flange plate, the transverse plate of the cross steel plate of the connecting component corresponds to the horizontal web plate, and the side plate of the connecting component corresponds to the second flange plate, so that the axial force of the beam is mainly transmitted through structures corresponding to each other, and the weakening of the section area of a node area is reduced; meanwhile, the newly added areas are concentrated near the middle Y axis, as shown in FIG. 17, the bending rigidity of the cross section is not increased, and the rotation performance of the node area is not influenced.

Performance test before and after improvement:

through elastic-plastic finite element simulation calculation, a node M-theta curve (figure 16) is obtained, and the hinge node of the axial force beam before and after improvement is compared, so that the following conditions can be found:

a. the slope of the improved node M-theta curve is obviously smaller than that of the M-theta curve before improvement; the rotational stiffness of the improved node is far smaller than that of the node before improvement, and the improved node structure can better meet the assumption of 'hinge' in a design model;

b. the improved node steel gradually enters plasticity after the turning angle reaches 0.008, and the node steel gradually enters plasticity after the turning angle reaches 0.002 before improvement; the improved node steel is elastic in the use stage and does not crack; the node material before improvement is subjected to plasticity in the use stage, so that the connecting material is easy to crack;

c. as can be seen from the stress cloud chart (fig. 15), when the rotation amount of the node reaches 0.008 radian, a large-area plastic region appears on the node before improvement, and a local plastic region appears on the edge of the node after improvement; this indicates that the improved node is in an elastic state during the use stage, and material yield does not occur.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The beam end hinged connection assembly for bearing axial force in a high-rise building comprises a vertical steel rib of a lateral force resisting component, and an axial force beam, wherein the axial force beam comprises a vertical web plate positioned in the vertical direction and first flange plates connected to two ends of the vertical web plate, and the first flange plates are positioned in the horizontal direction;

the height of the vertical plate of the cross steel plate in the vertical direction is equal to the height of the vertical web plate, but is less than the height of the end plate;

the cross steel plate has four limbs, and the welding has a curb plate that is located vertical side on stretching to two limbs in front, the rear, curb plate one end welding is on the vertical reinforcing bar of anti lateral force component, the other end welding of curb plate is on the end plate.

2. The beam-end hinged connection assembly for bearing axial force in high-rise buildings according to claim 1, characterized in that the end surfaces of the cross steel plate at the upper and lower sides are provided with removable first connection plates, and the first connection plates are provided with first bolt holes; a second connecting plate which can be removed is arranged at the end part of the first flange plate of the axial force beam, and a second bolt hole is formed in the second connecting plate;

3. The beam-end hinge joint assembly for high-rise buildings for carrying axial forces according to claim 2, wherein the at least one third bolt hole of the auxiliary plate is aligned with the first bolt hole of the first connecting plate, the at least one third bolt hole is aligned with the second bolt hole of the second connecting plate, and a bolt is inserted into the aligned bolt hole, thereby fixing the end plate to the end of the axial force beam.

4. The beam-end hinged connection assembly for high-rise buildings that handles axial forces of claim 3, wherein the first and second connection plates are removed after the end plates and the ends of the axial force beam are welded together.

5. The beam-end hinged connection assembly for bearing axial force in high-rise buildings according to claim 1, wherein the cross steel plate is composed of a vertical plate located in the vertical direction and a transverse plate located in the horizontal direction, a reinforcing plate is arranged between the vertical plate and the side plates, the vertical plate is welded at one end of the reinforcing plate, and the side plates are welded at the other end of the reinforcing plate.

6. The beam-end hinged connection assembly for high-rise buildings that handles axial forces of claim 1, wherein the axial force beam further includes a horizontal web in a horizontal direction, the horizontal web intersecting the vertical web such that the vertical web and the horizontal web form a unitary structure with a cross-shaped longitudinal section.

7. A beam-end hinged connection assembly for carrying axial forces in a high-rise building according to claim 6 wherein the horizontal web is provided at each of its two ends with a second flange plate, the second flange plates being in the vertical direction.

8. The beam-end hinged connection assembly for bearing axial force in high-rise buildings according to claim 1, characterized in that the end of the vertical web is exposed out of the end of the other components of the axial force beam except the vertical web, and the side of the end plate facing the axial force beam is provided with a strip-shaped groove, and the end of the vertical web is inserted into the strip-shaped groove.

9. The beam-end hinged connection assembly for bearing axial force in high-rise buildings according to claim 8, wherein the bar-shaped groove is arranged in a vertical direction, the upper end opening of the bar-shaped groove and one side of the bar-shaped groove facing the axial force beam are also opened, and the vertical web plate is inserted from the upper end opening of the bar-shaped groove and slides into the bar-shaped groove.