CN108316472B - Self-reset beam-column seismic joint based on carbon fiber disc spring - Google Patents

Abstract

The invention provides a self-resetting beam-column anti-seismic node based on a carbon fiber disc spring, which comprises a node beam, a node column, a self-resetting unit and an energy consumption unit, wherein the node beam is connected with the node column through a bolt, the self-resetting unit is abutted against the opposite outer side of a flange of the node beam and is connected with the node column, the self-resetting unit comprises a pre-tightening connecting piece and a carbon fiber disc spring, the pre-tightening connecting piece penetrates through the node column, and the carbon fiber disc spring is sleeved on the pre-tightening connecting piece and is further clamped between the pre-tightening connecting piece and the node column. The energy dissipation unit comprises angle steel and high-strength bolts, and two surfaces of the angle steel are respectively attached to the node column and the flange of the node beam and are fastened in a penetrating mode through the high-strength bolts. When an earthquake occurs, the energy is consumed through the material yield of the angle steel, and the carbon fiber disc spring is used for providing large resistance and restoring force for the node, so that the node can still self-restore after the earthquake occurs.

Description

Self-reset beam-column seismic joint based on carbon fiber disc spring

technical field

The invention belongs to the technical field of structural engineering anti-seismic, and relates to a self-resetting beam-column anti-seismic node based on a carbon fiber disc spring.

Background technique

At present, traditional beam-column joints can provide better strength and ductility under seismic action. However, large residual deformation will occur under strong earthquakes, which greatly increases the cost of post-earthquake repair of the structure, and even makes the structure abandoned.

To reduce the residual deformation of structures after earthquakes, there are two currently known techniques:

One way is to use prestressed self-resetting joints, but this kind of prestressed self-resetting joints is difficult to stretch and construct, and it is easy to cause local buckling of the beam, and there is prestressed relaxation that cannot be ignored, and it is also difficult to maintain the joints.

Another existing way is to use the superelastic properties of shape memory alloys to achieve the purpose of node energy dissipation and self-reset. Among them, superelasticity refers to the characteristic that when the material is subjected to stress in the austenite state, the stress-induced martensitic transformation occurs, and the deformation can be automatically recovered instantaneously after unloading. However, the self-resetting node of this shape memory alloy has a low bearing capacity and is more sensitive to temperature and loading frequency. At the same time, the price of the shape memory alloy is relatively expensive, which is not suitable for wide practical application.

SUMMARY OF THE INVENTION

In order to overcome the defects of the prior art, a self-resetting beam-column seismic node based on carbon fiber disc spring is provided, and the carbon fiber disc spring is used to provide greater resistance and restoring force for the node, so that the node can still be realized after the earthquake. reset.

To achieve the above object, the solution of the present invention is:

A self-reset beam-column seismic node based on a carbon fiber disc spring, comprising a node beam, a node column and a self-reset unit, the node beam and the node column are fixed to each other, and the self-reset unit is close to the node beam The opposite outer side of the flange is connected with the node column, the self-resetting unit includes a pre-tightening connector and a carbon fiber disc spring, the pre-tightening connector is penetrated on the node column, and the carbon fiber disc spring is sleeved on the pre-tightening connector and then sandwiched between the pre-tightening connector and the node column.

Preferably, the self-resetting unit includes a beam end plate abutting on the outer side of the node beam flange, the pre-tightening connector is passed through the beam end plate, and the beam end plate is fixed on the node column , the pre-tightening connector includes a fastening end protruding from the beam end plate, and the carbon fiber disc spring is clamped between the fastening end and the beam end plate.

Preferably, a plurality of pieces of the carbon fiber disc springs are sheathed on the same pre-tightening connector and stacked on each other to form a carbon fiber disc spring group.

Preferably, the pre-tightening connector is a pre-tightening bolt, the tightening end of the pre-tightening bolt is fastened by a pre-tightening nut, and the carbon fiber disc spring group is clamped between the pre-tightening nut and the beam between the end plates.

Preferably, the carbon fiber disc spring group includes a plurality of the carbon fiber disc springs stacked two by two, and a spacer is arranged between each two of the carbon fiber disc springs.

Preferably, the four carbon fiber disc springs on both sides of the same spacer are symmetrical in twos and then stacked on each other, and the two carbon fiber disc springs on the same side are stacked in series with each other and are bent in three sections and then bulge in the middle. The carbon fiber disc spring is flat after being compressed.

Preferably, an energy dissipation unit is provided on the opposite inner side of the flange of the node beam, and the energy dissipation unit is fixed between the node beam and the node column.

Preferably, the energy-consuming unit includes angle steel and high-strength bolts, and both sides of the angle steel are respectively attached to the flanges of the node column and the node beam, and are fastened through the high-strength bolts.

Preferably, stiffeners are fixed between the two outer sides of the node beam and the node column.

Preferably, the carbon fiber disc spring is a disc spring formed by bonding layers of carbon fiber cloth densely woven with carbon fiber.

The beneficial effects of the self-resetting beam-column seismic node based on the carbon fiber disc spring of the present invention include:

1) Under the action of the earthquake, the beam-column part remains elastic, and the deformation is concentrated in the node domain, which can effectively reduce the residual deformation of the beam-column joint after the earthquake and reduce the post-earthquake repair work;

2) The installation method is the same as that of traditional beam-column joints, the combination of disc springs is simple, the installation is simple, and the construction is convenient;

3) The use of carbon fiber disc springs makes full use of the high elastic modulus and high yield strength of carbon fiber, and can use a smaller number of disc springs to obtain a larger bearing capacity, which can effectively save space and improve its economy. The performance is very stable at different temperatures;

4) The carbon fiber disc spring used can easily obtain the resistance and deformation capacity required by the self-reset unit through different series-parallel stacking methods;

5) The angle steel with lower yield point is used to dissipate energy, and the replacement after the earthquake is simple and the cost is very low;

6) The bending moment resistance is provided by the combination of the carbon fiber disc spring group and the high-strength bolt. The preload of the disc spring is provided by the preload of the bolt, and it can ensure that the bolt is not damaged before the disc spring.

Description of drawings

1 is a schematic side view of a self-resetting beam-column seismic node based on a carbon fiber disc spring of the present invention;

Fig. 2 is corresponding to A-A in Fig. 1 sectional structure schematic diagram;

Fig. 3 is corresponding to B-B cross-sectional structure schematic diagram in Fig. 1;

FIG. 4 is an enlarged schematic view of the combined installation of the carbon fiber disc spring and the high-strength bolt corresponding to the partial area in FIG. 3;

FIG. 5 is a schematic diagram corresponding to the state of FIG. 4 after forced compression.

Labels in the figure:

I-beam 1; I-beam upper flange 1001; I-beam lower flange 1002; I-beam web 1003; I-beam column 2; I-beam front flange 2001; I-beam rear Flange 2002; I-beam column web 2003; first preload bolt 31; second preload bolt 32; third preload bolt 33; fourth preload bolt 34; upper end plate 41; lower end plate 42; upper beam end stiffener 51; lower beam end stiffener 52; first column flange high-strength bolt 61; second column flange high-strength bolt 62; third column flange high-strength bolt 63; fourth column flange high-strength bolt 64; first Beam flange high-strength bolts 111; second beam flange high-strength bolts 112; third beam flange high-strength bolts 113; fourth beam flange high-strength bolts 114; The fourth carbon fiber disk spring group 74; the first angle steel 81; the second angle steel 82; the third angle steel 83; the fourth angle steel 84; the first carbon fiber disk spring 91; the second carbon fiber disk spring 92; the third carbon fiber disk spring 93; Four carbon fiber disk springs 94; fifth carbon fiber disk springs 95; sixth carbon fiber disk springs 96; seventh carbon fiber disk springs 97; eighth carbon fiber disk springs 98; first gasket 101; second gasket 102; third gasket 103.

Detailed ways

The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

As shown in FIG. 1 , the present invention first provides a self-resetting beam-column seismic node based on a carbon fiber disc spring, including a node beam 1, a node column 2 and a self-resetting unit, and the node beam 1 and the node column 2 pass through Bolted connection, the self-resetting unit is close to the opposite outer side of the flange of the node beam 1 and is connected with the node column 2, the self-resetting unit includes the pre-tightening connector 31/32/33/34 and carbon fiber Disc springs 71/72/73/74, the preloaded connectors 31/32/33/34 are passed through the node column 2, and the carbon fiber disc springs 71/72/73/74 are sleeved on the preload. The tightening connector 31/32/33/34 is further sandwiched between the preloading connector 31/32/33/34 and the node column 2 . An energy dissipation unit is provided on the opposite inner side of the flange of the node beam 1 , and the energy dissipation unit is connected between the node beam 1 and the node column 2 .

2 and 3, specifically, the self-reset unit includes beam end plates 41/42 abutting against the outer side of the flange of the node beam 1, and the preloaded connecting pieces 31/32/33/34 Passing through the beam end plates 41/42 and connecting the beam end plates 41/42 to the node column 2, the pre-tightening connectors 31/32/33/34 include protruding from the beam ends. Fastening ends of the plates 41/42, the carbon fiber disc springs 71/72/73/74 are clamped between the fastening ends and the beam end plates 41/42. The energy-consuming unit includes angle steel 81/82/83/84 and high-strength bolts. The two sides of the angle steel 81/82/83/84 are respectively attached to the flanges of the node column 2 and the node beam 1 and pass through The high-strength bolts are threaded and fastened.

As shown in FIG. 4 and FIG. 5 , preferably, a plurality of pieces of the carbon fiber disc springs 71/72/73/74 are sheathed on the same preloading connector 31/32/33/34 and stacked on each other to form carbon fiber Disc spring set. The pre-tightening connectors 31/32/33/34 are pre-tightening bolts, the fastening ends of the pre-tightening bolts are fastened by the pre-tightening nut, and the carbon fiber disc spring group is clamped on the pre-tightening nut between the beam end plates 41/42. The carbon fiber disc spring group includes a plurality of carbon fiber disc springs stacked two by two, and a spacer 101/102/103 is arranged between each two carbon fiber disc springs. The four carbon fiber disc springs on both sides of the same spacer are symmetrical in two and stacked on each other, and the two carbon fiber disc springs on the same side are stacked on each other, and the carbon fiber disc springs are flat after being compressed. .

Preferably, stiffeners 51/52 are fixed between the two outer sides of the node beam 1 and the beam end plates 41/42 on the outer surface of the node column 2 .

After having the above-mentioned structural features, in conjunction with FIG. 1 to FIG. 5 , the present invention can be implemented according to the following process:

A self-resetting steel structure beam-column seismic node based on a carbon fiber disc spring group comprises an I-beam 1, an I-beam 2, a self-resetting unit and an energy dissipation unit. The self-reset unit includes preload bolts 31/32/33/34, carbon fiber disc spring sets 71/72/73/74, end plates 41/42, and beam end stiffeners 51/52. The energy dissipation unit includes column flange high-strength bolts 61/62/63/64, beam flange high-strength bolts 111/112/113/114, and angle steel 81/82/83/84.

Eight holes are reserved on the front flange 2001 of the I-beam column, two holes corresponding to the holes in the front flange 2001 of the I-beam column are reserved on the upper end plate 41, and two holes corresponding to the holes in the front flange 2001 of the I-beam column are reserved on the lower end plate 42. The two cavities corresponding to the holes in the front flange 2001 of the I-beam column are reserved on the first angle steel 81, the second angle steel 82, the third angle steel 83, and the fourth angle steel 84 respectively corresponding to the holes in the front flange 2001 of the I-beam column. A corresponding void. Two holes are reserved on the upper flange 1001 of the I-beam, and one hole corresponding to the cavity of the I-beam 1001 is reserved on the first angle steel 81 and the second angle steel 82 respectively. Similarly, two holes are reserved on the lower flange 1002 of the I-beam, and one hole corresponding to the lower flange 1002 of the I-beam is reserved on the third angle steel 83 and the fourth angle steel 84 .

The first carbon fiber disc spring group 71 and the second carbon fiber disc spring group 72 are located on the outer side of the upper flange 1001 of the I-beam, and are distributed on the left and right sides of the upper beam end stiffening rib 51; the third carbon fiber disc spring The group 73 and the fourth carbon fiber disc spring group 74 are located outside the lower flange 1002 of the I-beam, and are distributed on the left and right sides of the lower beam end stiffener 52; the first angle steel 81 and the second angle steel 82 Located on the inner side of the upper flange 1001 of the I-beam beam, and distributed on the left and right sides of the I-beam beam web 1003; the third angle steel 83 and the fourth angle steel 84 are located on the inner side of the lower flange of the I-beam beam, and are distributed in The left and right sides of the I-beam web 1003.

During the installation process, as shown in Figures 1 and 2, the upper end plate 41 and the beam upper flange 1001 are vertically welded first, and the lower end plate 42 and the beam lower flange 1001 are vertically welded. The upper beam end stiffener 51 is vertically welded to the end plate 41 and the I-beam upper flange 1001, and the lower beam end stiffener 52 is vertically welded to the end plate 42 and the I-beam lower flange 1002.

Then, the high-strength bolts 111/112 of the beam flange are respectively passed through the reserved holes of the upper flange 1001 of the I-beam beam, and then respectively passed through the reserved holes of the angle steel 81/82, and then tightened with nuts. Pass the high-strength bolts 113/114 of the beam flange through the reserved holes of the lower flange 1002 of the I-beam beam respectively, and then pass through the reserved holes of the angle steel 83/84 respectively, and then use nuts to fasten them.

Then place the I-beam 1 and the I-beam column 2 vertically, and pass the high-strength bolts 61/62 of the column flange through the reserved holes of the front flange 2001 of the I-beam column respectively, and then pass through the pre-prepared holes of the angle steel 81/82 respectively. Leave holes, then tighten them with nuts, and then pass the column flange high-strength bolts 64/65 through the reserved holes in the front flange 2001 of the I-beam column respectively, and then pass through the reserved holes in the angle steel 83/84 respectively, and then use the nuts. Fasten.

Next, pass the preload bolts 31/32/33/34 through the reserved holes of the front flange 2001 of the I-beam column, the reserved holes of the end plate 41/42, and the carbon fiber disc spring group 71/72/73/ The middle round hole of 74 is pre-tightened by the nut, and the size of the pre-tightening force can be adjusted according to the degree of tightening of the nut.

As shown in Figure 4, the manner in which the carbon fiber disc spring group and the preload bolt are matched and connected is further explained. Among them, it is preferable to use a disc spring made of carbon fiber cloth that is densely woven from carbon fiber as the carbon fiber disc spring. The matching of the carbon fiber disc spring group is the same as this matching process), the preload bolt 71 passes through the right flange 2001 of the I-beam column with holes in advance, the upper end plate 41 with holes in advance, the first carbon fiber disk spring 91, the second carbon fiber Disc spring 92, first washer 101, third carbon fiber disc spring 93, fourth carbon fiber disc spring 94, second washer 102, fifth carbon fiber disc spring 95, sixth carbon fiber disc spring 96, third washer 103, The seventh carbon fiber disc spring 97 and the eighth carbon fiber disc spring 98 . Among them, the first carbon fiber disc spring 91 and the second carbon fiber disc spring 92 are superimposed in parallel, and are placed in series with the parallel superimposed third carbon fiber disc spring 93 and the fourth carbon fiber disc spring 94 and are symmetrical with respect to the first gasket 101. Similarly, Yes, the fifth carbon fiber disc spring 95 is superimposed in parallel with the sixth carbon fiber disc spring 96 and is placed in series with the parallel superimposed seventh carbon fiber disc spring 97 and the eighth carbon fiber disc spring 98 and is symmetrical about the third spacer 103, the fourth The carbon fiber disc spring 94 and the fifth carbon fiber disc spring 95 are symmetrical with respect to the second spacer 102 .

Under the action of the earthquake load, the entire node is subjected to the reciprocating bending moment load, resulting in mutual angle deformation between the front flange 2001 of the I-beam column and the end plate 41/42. At this time, the angle steel 81/82/83 of the energy dissipation unit The /84 material enters into the yield area to produce plastic deformation, which can dissipate the seismic energy. At this time, the carbon fiber disc spring group 71/72/73/74 of the self-resetting unit can provide restoring force for the node to return to the original position, and finally make the The main structural components such as I-beam 1, I-beam 2 and end plates 41/42 remain elastic, so as to achieve the purpose of replacing the energy-consuming component angle steel without repairing the main structural components after the earthquake.

As shown in FIG. 5 , FIG. 5 is a schematic diagram of the deformation of the carbon fiber disc spring group after being flattened. In the first carbon fiber disk spring 91, the second carbon fiber disk spring 92, the third carbon fiber disk spring 93, the fourth carbon fiber disk spring 94, the fifth carbon fiber disk spring 95, the sixth carbon fiber disk spring 96, the seventh carbon fiber disk spring 97, The eighth carbon fiber disc spring 98 is flattened, and this action provides bending moment resistance for the entire node. During the whole process, the carbon fiber material is in an elastic state. After the earthquake, the carbon fiber disc spring returns to its original position. The restoring force provided by the carbon fiber disc spring can be adjusted according to its thickness, inner diameter, outer diameter and height difference before and after flattening.

The main energy dissipation method of this node is that the angle steel material enters into yield under the action of earthquake, and dissipates energy under the reciprocating action of earthquake load. In addition, in the case of reciprocating deformation of the nodes, the carbon fiber disc spring group 7 can effectively absorb the deformation of the nodes to protect the preload bolts 31/32/33/34, prevent them from being broken under tension, and ensure that they have sufficient At the same time, the angle steel 81/82/83/84 enters the yield earlier, and can also protect the column flange high-strength bolts 61/62/63/64 and beam flange high-strength bolts 111/112/113/114. , to avoid tension fracture of column flange high-strength bolts 61/62/63/64, and ensure that column flange high-strength bolts 61/62/63/64 and beam flange high-strength bolts 111/112/113/114 have sufficient shear capacity.

After completing the above implementation process, the following features of the present invention should be reflected:

During an earthquake, energy is dissipated by the material yielding of the angle steel, and the carbon fiber disc spring is used to provide large resistance and recovery force for the node, so that the node can still be reset after the earthquake. Compared with traditional steel disc springs, carbon fiber disc springs have higher elastic modulus and yield strength, thus providing greater bearing capacity and deformation capacity. At the same time, carbon fiber disc springs take up less space and are easy to install.

The above description of the embodiments is for the convenience of those skilled in the art to understand and apply the present invention. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (3)

1. The utility model provides a from restoring to throne beam column antidetonation node based on carbon fiber dish spring which characterized in that: the self-resetting unit comprises a pre-tightening connecting piece and a carbon fiber disc spring, wherein the pre-tightening connecting piece is arranged on the node column in a penetrating manner, and the carbon fiber disc spring is sleeved on the pre-tightening connecting piece and then clamped between the pre-tightening connecting piece and the node column; the self-resetting unit comprises a beam end plate abutting against the outer side of the flange of the node beam, the pre-tightening connecting piece penetrates through the beam end plate and is connected to the node column, the pre-tightening connecting piece comprises a fastening end extending out of the beam end plate, and the carbon fiber disc spring is clamped between the fastening end and the beam end plate; energy dissipation units are arranged on the opposite inner sides of the flanges of the node beams and connected between the node beams and the node columns, each energy dissipation unit comprises an angle steel and a high-strength bolt, and two surfaces of each angle steel are respectively attached to the node columns and the flanges of the node beams and are fastened in a penetrating mode through the high-strength bolts; the carbon fiber disc springs are sleeved on the same pre-tightening connecting piece and are stacked mutually to form a carbon fiber disc spring group, the carbon fiber disc spring group comprises a plurality of carbon fiber disc springs which are stacked pairwise, and a spacing gasket is arranged between every two carbon fiber disc springs; the four carbon fiber disc springs on the two sides of the same spacer are symmetrical pairwise and then are mutually overlapped, two carbon fiber disc springs on the same side are mutually overlapped in a serial mode, and the carbon fiber disc springs are straight after being pressed; the carbon fiber disc spring is a disc spring formed by bonding carbon fiber cloth layers which are formed by closely weaving carbon fibers.

2. The self-resetting beam-column anti-seismic node of claim 1, wherein: the pre-tightening connecting piece is a pre-tightening bolt, a tightening end of the pre-tightening bolt is tightened through a pre-tightening nut, and the carbon fiber disc spring group is clamped between the pre-tightening nut and the beam end plate.

3. The self-resetting beam-column seismic node of claim 1 or 2, wherein: stiffening ribs are fixedly connected between the two outer sides of the node beam and the node columns.

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