CN114319590A - Self-resetting composite structure beam column joint and construction method thereof - Google Patents
Self-resetting composite structure beam column joint and construction method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 32
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Abstract
The invention discloses a self-resetting composite structure beam column node and a construction method thereof, wherein the self-resetting composite structure beam column node comprises an I-shaped steel beam, a T-shaped connecting piece, a friction member, a square steel tube concrete column and an SMA screw rod, wherein the I-shaped steel beam is horizontally arranged on the side edge of the square steel tube concrete column, and the T-shaped connecting pieces are symmetrically arranged on the outer side of the beam end of the I-shaped steel beam from top to bottom; one end of the T-shaped connecting piece is fixed with a flange plate of the I-shaped steel beam through a third connecting bolt, and the other end of the T-shaped connecting piece is connected with the square steel tube concrete column through an SMA screw rod; the friction members are symmetrically arranged on two sides of a web plate of the I-shaped steel beam, one end of each friction member is fixed with the side wall of the square steel tube concrete column through a first connecting bolt, and the other end of each friction member is connected with the web plate of the I-shaped steel beam through a second connecting bolt; the self-resetting capability is provided for the node through the superelasticity of the SMA screw; the friction member is utilized to provide good energy consumption capability, the joint assembling construction process does not need on-site welding, and the requirements of industrialization and assembly of the building with the combined structure are met.
Description
Technical Field
The invention belongs to the technical field of structural engineering earthquake resistance and shock absorption, and particularly relates to a self-resetting composite structure beam-column joint and a construction method thereof.
Background
At present, the structural earthquake-proof theory is increasingly perfect, but the earthquake still seriously threatens the survival and development of the human society; although the building structure designed according to the existing earthquake-resistant standard cannot collapse integrally under the action of strong earthquake, the structure can generate unrecoverable residual deformation when being subjected to the action of earthquake which is equal to or higher than the earthquake fortification intensity of the local area; the residual deformation not only affects the capability of the structure to bear aftershocks, but also causes damage caused by excessive plastic deformation and residual deformation which is difficult to recover, so that the structure has to be dismantled after the earthquake, and even if the structure is repaired, the cost is high; the method can realize the restorability target under the action of strong shock, effectively improve the post-disaster recovery capability of vast towns, particularly large cities, and has remarkable social and economic benefits; the self-resetting structure has clear principle, can reduce the residual deformation of the structure after the earthquake to the maximum extent, and can quickly recover the use function of the structure; self-resetting beam-column joints are usually dominated by post-tensioned prestressed beam-column joints and shape memory alloy beam-column joints.
The shape memory alloy has shape memory characteristics and superelastic characteristics; the shape memory alloy not only has a flag-shaped stress-strain curve, but also can dissipate certain energy under the action of an earthquake; more critically, shape memory alloys can provide up to 6-8% self-resetting strain, a property that provides conditions for the study of self-resetting nodes; the shape memory alloy beam column node is generally formed by arranging a large-diameter SMA rod at a beam end, and utilizing the excellent large-deformation restorability and certain energy consumption capability of the material of the shape memory alloy beam column node to realize better self-resetting performance of the node, and overcomes the defects of low elastic deformation capability of a prestressed tendon or a prestressed steel strand, complicated construction of a post-tensioned prestressed node and large prestress loss.
Then, in the existing self-resetting structure adopting SMA at present, most of SMA components are used as resetting elements and separate energy consumption parts, so that the energy consumption capability is weak; in order to increase the energy consumption capability and increase the size and the number of the SMA test pieces, the consumption of the SMA material is too large and uneconomical; the SMA self-resetting nodes are mostly connected by end plates, however, the load of the end plate connecting beam ends can only be borne by the contact friction force between the beam end plates and the columns, the requirements on the blanking size of the component, the flatness of the end plates and the manufacture of the steel component are very high, the welding between the sealing plates and the beams can also generate unavoidable buckling deformation, and a lot of stress uncertainty is increased; at present, most of the hot spots on the self-resetting structure research are concentrated on concrete structures and pure steel structures, and other existing important structural forms are rarely reported.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a self-resetting composite structure beam column node and a construction method thereof, and aims to solve the technical problems of weak energy consumption capability, high installation difficulty and single structural form of the conventional SMA self-resetting node.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a self-resetting composite structure beam column node which comprises an I-shaped steel beam, a T-shaped connecting piece, a friction member, a square steel tube concrete column and an SMA screw rod, wherein the I-shaped steel beam is fixedly connected with the T-shaped connecting piece;
the T-shaped connecting pieces are symmetrically arranged on the outer sides of the beam ends of the I-shaped steel beams from top to bottom; one end of the T-shaped connecting piece is fixed with a flange plate of the I-shaped steel beam through a third connecting bolt, and the other end of the T-shaped connecting piece is connected with the square steel tube concrete column through an SMA screw rod;
the friction members are symmetrically arranged on two sides of a web plate of the I-shaped steel beam, one end of each friction member is fixed with the side wall of the square steel tube concrete column through a first connecting bolt, and the other end of each friction member is connected with the web plate of the I-shaped steel beam through a second connecting bolt.
Further, the T-shaped connecting piece comprises a T-shaped piece flange plate and a T-shaped piece web plate; the T-shaped part flange plate is vertically arranged at the end part of the upper flange or the lower flange of the I-shaped steel beam, and one side of the T-shaped part flange plate is tightly contacted with the side wall of the square steel tube concrete column; the T-shaped part web plate is horizontally arranged on the upper side of the upper flange or the lower side of the lower flange of the I-shaped steel beam, and the end part of the T-shaped part web plate is vertically fixed with the T-shaped part flange plate;
the SMA screw rod horizontally penetrates through the square steel tube concrete column, and two ends of the SMA screw rod extend to the outer side of the side wall of the square steel tube concrete column; the end part of the SMA screw rod penetrates through the flange plate of the T-shaped part and is screwed and fixed through a high-strength nut; and the T-shaped part web plate and the upper flange or the lower flange of the I-shaped steel beam are fixed by a third connecting bolt.
Furthermore, the T-shaped connecting piece also comprises a stiffening rib; the stiffening ribs are vertically fixed on the web plate of the T-shaped part and are arranged far away from one side of the I-shaped steel beam, and the end parts of the stiffening ribs are vertically fixed with the flange plate of the T-shaped part; the stiffening ribs and the web plate of the I-shaped steel beam are positioned in the same vertical plane.
Further, a first column screw hole is formed in the square steel tube concrete column; the first column screw holes and the SMA screw rods are arranged in a one-to-one correspondence manner, and the SMA screw rods horizontally penetrate through the first column screw holes; wherein, the aperture of first post screw is greater than the diameter of SMA screw.
Furthermore, the friction member comprises an energy consumption plate, a channel steel and an end plate; the web plate of the channel steel is vertically arranged and is arranged close to the web plate of the I-shaped steel beam; the energy dissipation plate is arranged between the web plate of the channel steel and the web plate of the I-shaped steel beam, and the web plate of the channel steel, the energy dissipation plate and the web plate of the I-shaped steel beam are fixedly connected together through a second connecting bolt; the end plate is vertically arranged at the end part of the channel steel and is flush with the beam end of the I-shaped steel beam; the end plate and the square steel tube concrete column are fixedly connected together through a first connecting bolt;
a plurality of beam web plate long round holes are uniformly formed in a web plate of the I-shaped steel beam, a plurality of channel steel friction holes are uniformly formed in a web plate of the channel steel, and a plurality of energy dissipation plate holes are uniformly formed in the energy dissipation plate; the beam web plate long round hole, the channel steel friction hole and the energy dissipation plate hole are correspondingly arranged, and the second connecting bolt sequentially penetrates through the channel steel friction hole, the energy dissipation plate hole and the beam web plate long round hole; wherein, the long axis direction of the beam web oblong hole is parallel to the axis direction of the I-shaped steel beam.
Furthermore, the energy dissipation plate is a brass friction plate.
Further, the SMA screw is made of a dog-bone-shaped SMA rod; the dog-bone-shaped SMA bar comprises a weakening section, a transition section and two anchoring sections, wherein the two anchoring sections are symmetrically arranged at two ends of the weakening section, and the transition section is arranged between the anchoring sections and the weakening section; wherein the diameter of the anchoring section is larger than the diameter of the weakening section.
Furthermore, the SMA screw is made of an SMA material; the austenite phase transition finishing temperature of the SMA material is lower than the ambient temperature.
The invention also provides a construction method of the self-resetting composite structure beam-column joint, which comprises the following steps:
mounting the T-shaped connecting piece at the beam end of the I-shaped steel beam by using a third connecting bolt;
hoisting the I-shaped steel beam to a preset installation position, and fixedly connecting the T-shaped connecting piece with the square steel tube concrete column by using the SMA screw rod so as to fixedly connect the I-shaped steel beam with the square steel tube concrete column;
the friction members are symmetrically arranged on two sides of a web plate of the I-shaped steel beam, one end of each friction member is fixed to the side wall of the square steel tube concrete column through a first connecting bolt, and the other end of each friction member is fixed to the web plate of the I-shaped steel beam through a second connecting bolt.
Further, the SMA screw rod needs to be subjected to heat treatment before use; the heat treatment process specifically comprises the following steps:
and (3) placing the SMA screw in a muffle furnace, and carrying out heat treatment operation at the temperature of 350-400 ℃ for 15-45 min.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a self-resetting composite structure beam column joint and a construction method thereof, wherein a T-shaped connecting piece is arranged between a square steel tube concrete column and an I-shaped steel beam; the T-shaped connecting piece is used as a beam-column connecting element, and under the action of an earthquake, the beam-column joint can realize reciprocating motion by taking the T-shaped connecting piece as a rotation center so as to dissipate earthquake energy; the T-shaped connecting piece is connected with the square steel tube concrete column by using the SMA screw rod, and the SMA screw rod is used as a reset element, so that the self-reset performance of the beam column node is ensured; energy dissipation is realized by arranging friction members on two sides of a web plate of the I-shaped steel beam and utilizing friction between the friction members and the I-shaped steel beam; the node is simple in form and reasonable in stress, and self-resetting capability is provided for the node through the superelasticity of the SMA screw; meanwhile, the friction member is utilized to provide good energy consumption capability, the joint assembling construction process does not need on-site welding, and the requirements of industrialization and assembly of the building with the combined structure are met.
Furthermore, the stiffening ribs are arranged in the T-shaped connecting piece, so that the rigidity of the T-shaped connecting piece is improved, the local stability and reliability of the T-shaped connecting piece are ensured, and the effective transmission of concentrated force is ensured.
Furthermore, the diameter of the first column screw hole in the square steel tube concrete column is larger than that of the SMA screw rod, so that the situation that the SMA screw rod collides with the hole wall of the first column screw hole when a beam column node is opened, and the SMA screw rod is subjected to shearing action and is broken in advance is avoided.
Furthermore, the friction member is formed by combining an energy consumption plate, a channel steel and an end plate, so that the energy dissipation capacity of the beam-column node is effectively improved on the premise that the node meets the self-resetting requirement; the web plate oblong hole is formed in the web plate of the I-shaped steel beam, so that the slippage of the second connecting bolt in the node rotating process is adapted; through adjusting the pretightning force of second connecting bolt to realize the regulation to node hysteresis power consumption ability.
Furthermore, the SMA screw rod is made of a dog-bone-shaped SMA rod, so that the deformation of the node can be concentrated on the SMA screw rod, the beam column is kept in an elastic state, the residual deformation is reduced to the maximum extent, and the repair and reconstruction work after the earthquake is reduced; the diameter of the anchoring section of the SMA screw is larger than that of the weakening section, so that the anchoring end of the SMA screw is ensured to be broken in advance due to stress concentration, and the stability and the safety of the structure are improved.
Furthermore, the austenite phase transition finishing temperature of the SMA material for manufacturing the SMA screw is lower than the ambient temperature, so that the SMA screw is ensured to have good superelasticity performance at the ambient temperature, and a reliable restoring force is provided for the node.
Furthermore, the heat treatment is carried out before the SMA screw rod is used, so that the superelasticity of the SMA screw rod can be effectively excited, and the recovery strain of the SMA screw rod can reach 6-8%.
Drawings
FIG. 1 is a schematic overall structure diagram of a self-resetting composite structure beam-column node according to an embodiment;
FIG. 2 is a detailed explosion effect diagram of a self-resetting composite structure beam-column joint according to an embodiment;
FIG. 3 is a schematic structural view of a square concrete-filled steel tubular column in the example;
FIG. 4 is a schematic structural view of an I-beam in an embodiment;
FIG. 5 is a schematic structural view of a T-shaped connector in an embodiment;
FIG. 6 is a schematic structural view of a friction member in the embodiment;
FIG. 7 is a schematic diagram of an SMA screw structure in an embodiment;
FIG. 8 is a schematic view of the high-tensile screw structure in the example.
The energy-consuming-beam-reinforced concrete composite structure comprises 1 square steel tube, 2 concrete, 3I-shaped steel beam, 4T-shaped connecting pieces, 5 friction components, 6 square steel tube concrete columns, 7SMA screw rods, 8 first connecting bolts, 9 second connecting bolts, 10 third connecting bolts, 11 energy-consuming plates, 12 beam web long round holes, 13 channel steel friction holes, 14 energy-consuming plate holes, 15 channel steel end plate holes, 16 first beam flange holes, 17T-shaped web plate holes, 18T-shaped web plate holes, 19 first column screw holes, 20 second column screw holes, 21 beam upper flange plates, 22 beam webs, 23 beam lower flange plates, 24T-shaped web plate, 25T-shaped web plates, 26 channel steel, 27 end plates, 28 high-strength nuts and 29 stiffening ribs, wherein the energy-consuming-beam-reinforced concrete composite structure comprises a steel plate, a steel plate and a reinforcing rib; the weakened section 71, the transition section 72, and the anchored section 73.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a self-resetting composite structure beam column node which comprises an I-shaped steel beam 3, a T-shaped connecting piece 4, a friction member 5, a square steel tube concrete column 6 and an SMA screw 7; the I-shaped steel beam 3 is horizontally arranged on the side edge of the square steel tube concrete column 6, and the T-shaped connecting pieces 4 are symmetrically arranged on the outer side of the beam end of the I-shaped steel beam 3 from top to bottom; one end of the T-shaped connecting piece 4 is fixed with a flange plate of the I-shaped steel beam 3 through a third connecting bolt 10, and the other end of the T-shaped connecting piece 4 is connected with the square steel tube concrete column 6 through SMA 7; the friction members 5 are symmetrically arranged on two sides of a web plate of the I-shaped steel beam 3, one end of each friction member 5 is fixed to the side wall of the square steel tube concrete column 6 through a first connecting bolt 8, and the other end of each friction member 5 is connected with the web plate of the I-shaped steel beam 3 through a second connecting bolt 9.
In the invention, the I-shaped steel beam 3 is divided into an upper beam flange plate, a web plate and a lower beam flange plate according to the internal space; the upper flange plate of the beam is positioned at the upper end of the web plate of the beam and is vertically fixed; the beam lower flange plate is positioned at the lower end of the beam web plate and is vertically fixed; the beam upper flange plate and the beam lower flange plate are arranged in parallel up and down.
The square steel tube concrete column 6 comprises a square steel tube 1 and concrete 2, and the concrete 2 is filled in the square steel tube 1; the SMA screw 7 horizontally penetrates through the square steel tube concrete column 6, and two ends of the SMA screw 7 extend to the outer side of the side wall of the square steel tube concrete column 6; the square steel tube concrete column 6 is provided with first column screw holes 19, and the first column screw holes 19 are arranged in one-to-one correspondence with the SMA screw rods 7; the SMA screw 7 horizontally penetrates through the first column screw hole 19; wherein, the aperture of the first column screw hole 19 is larger than the diameter of the SMA screw 7.
The T-shaped connecting piece 4 comprises a T-shaped part flange plate 24, a T-shaped part web plate 25 and a stiffening plate 29; the T-shaped part flange plate 24 is vertically arranged at the end part of the upper beam flange plate or the lower beam flange plate, and one side of the T-shaped part flange plate 24 is tightly contacted with the side wall of the square steel tube concrete column 6; a plurality of T-shaped part flange holes 18 are uniformly formed in the T-shaped part flange plate 24, and the extending end of the SMA screw 7 penetrates through the T-shaped part flange holes 18 and is screwed and fixed through a high-strength screw cap 28; the T-shaped piece web 25 is horizontally arranged on the upper side of the upper flange plate of the beam or on the lower side of the lower flange plate of the beam; the T-shaped piece web plate 25 is fixedly connected with the beam upper flange plate or the beam lower flange plate through a third connecting bolt 10; the end of the tee web 25 is fixed perpendicular to the tee flange plate 24; the stiffening ribs 29 are vertically fixed on the web plate 25 of the T-shaped part and are arranged far away from one side of the I-shaped steel beam 3; the ends of the stiffeners 29 are fixed perpendicular to the tee flange plate 24, and the stiffeners 29 lie in the same vertical plane as the web.
The friction member 5 comprises an energy consumption plate 11, a channel steel 26 and an end plate 27; the web plate of the channel steel 26 is vertically arranged and is tightly attached to the beam web plate; the energy dissipation plate 11 is arranged between the web of the channel steel 26 and the beam web; the web plate of the channel steel 26, the energy dissipation plate 11 and the beam web plate are fixedly connected together through a second connecting bolt 9; the end plate 27 is vertically arranged at the end part of the channel steel 26 and is flush with the beam end of the I-shaped steel beam 3; the end plate 27 is fixedly connected with the side wall of the square steel tube concrete column 6 through a first connecting bolt 8; a plurality of beam web plate oblong holes 12 are uniformly formed in the beam web plate, a plurality of channel steel friction holes 13 are uniformly formed in the web plate of the channel steel 26, and a plurality of energy dissipation plate holes 14 are uniformly formed in the energy dissipation plate 11; the beam web plate long circular hole 12, the channel steel friction hole 13 and the energy consumption plate hole 14 are correspondingly arranged, and the second connecting bolt 9 sequentially penetrates through the channel steel friction hole 13, the energy consumption plate hole 14 and the beam web plate long circular hole 12; wherein the long axis direction of the beam web plate oblong hole 12 is parallel to the axis direction of the I-shaped steel beam 3; preferably, the energy consumption plate 11 is a brass friction plate.
The SMA screw 7 is a dog-bone-shaped SMA bar which comprises a weakening section 71, a transition section 72 and anchoring sections 73, the anchoring sections 73 are symmetrically arranged at two ends of the weakening section 71, and the transition section 72 is arranged between the anchoring sections 73 and the weakening section 71; wherein, the diameter of the anchoring section 73 is larger than that of the weakening section 71, and the diameter of the weakening section 71 is smaller than the aperture of the first column screw hole 19; the SMA screw 7 is made of an SMA material; the austenite phase transition finishing temperature of the SMA material is lower than the ambient temperature; wherein, the SMA screw 7 needs to be subjected to heat treatment before use; specifically, the SMA screw rod is placed in a muffle furnace, and heat treatment operation is carried out at the temperature of 350-400 ℃ for 15-45 min.
The invention relates to a construction method of a self-resetting composite structure beam column node, which comprises the following steps:
mounting the T-shaped connecting piece 4 at the beam end of the I-shaped steel beam 3 by using a third connecting bolt 10;
hoisting the I-shaped steel beam 3 to a preset installation position, and fixedly connecting the T-shaped connecting piece 4 with the square steel tube concrete column 6 by using the SMA screw 7 so as to fixedly connect the I-shaped steel beam 3 with the square steel tube concrete column 6 together;
the friction members 5 are symmetrically arranged on two sides of a web plate of the I-shaped steel beam 3, one end of each friction member 5 is fixed to the side wall of the square steel tube concrete column 6 through a first connecting bolt 8, and the other end of each friction member 5 is fixed to the web plate of the I-shaped steel beam 3 through a second connecting bolt 9.
The invention relates to a self-resetting composite structure beam column node and a construction method thereof.A T-shaped connecting piece is arranged between a square steel tube concrete column and an I-shaped steel beam; the T-shaped connecting piece is used as a beam-column connecting element, and under the action of an earthquake, the beam-column joint can realize reciprocating motion by taking the T-shaped connecting piece as a rotation center so as to dissipate earthquake energy; the T-shaped connecting piece is connected with the square steel tube concrete column by using the SMA screw rod, and the SMA screw rod is used as a reset element, so that the self-reset performance of the beam column node is ensured; energy dissipation is realized by arranging friction members on two sides of a web plate of the I-shaped steel beam and utilizing friction between the friction members and the I-shaped steel beam; meanwhile, the friction member is arranged, so that the shearing resistance of the beam-column joint can be improved; the welding processes of the components are all prefabricated in a factory and then are directly assembled after being conveyed to a construction site, so that the assembly construction of the nodes is realized, the labor cost is reduced, the structure is novel, the connection mode is simple and convenient, and the safety and the reliability are high.
Examples
Take the beam column node form of symmetrically arranging I-shaped steel beams 3 at two sides of a steel pipe concrete column 6 as an example.
As shown in fig. 1 to 8, the present embodiment provides a self-resetting composite structure beam-column joint, which includes two i-shaped steel beams 3, four T-shaped connectors 4, four friction members 5, a square steel tube concrete column 6, an SMA screw 7, a first connecting bolt 8, a second connecting bolt 9, a third connecting bolt 10, and a high-strength nut 28; the T-shaped connecting piece 4 is used as a beam-column connecting element and is used for connecting the I-shaped steel beam 3 with the square steel tube concrete column 6; the SMA screw 7 is used as a reset element, and the friction member 5 is used as a friction energy dissipation element.
The two I-shaped steel beams 3 are horizontally and symmetrically arranged on two sides of the square steel tube concrete column 6, and the beam ends of the I-shaped steel beams 3 are closely attached and fixed with the square steel tube concrete column 6 through T-shaped connecting pieces 4, so that the square steel tube concrete column 6 and the I-shaped steel beams 3 are arranged vertically; the first T-shaped connecting piece and the second T-shaped connecting piece are positioned on one side of the square steel tube concrete column 6, and the third T-shaped connecting piece and the fourth T-shaped connecting piece are positioned on the other side of the square steel tube concrete column 6; the first T-shaped connecting piece and the second T-shaped connecting piece are arranged on the outer side of the beam end of one I-shaped steel beam 3 in an up-down symmetrical mode; the third T-shaped connecting piece and the fourth T-shaped connecting piece are symmetrically arranged at the outer side of the beam end of the other I-shaped steel beam 3 from top to bottom.
In this embodiment, the i-shaped steel beam 3 includes a beam upper flange plate 21, a beam web plate 22, and a beam lower flange plate 23; the beam upper flange plate 21 and the beam lower flange plate 23 are arranged in parallel at an interval from top to bottom, and the beam web plate 22 is vertically arranged between the beam upper flange plate 21 and the beam lower flange plate 23; wherein, six first beam flange holes 16 are uniformly arranged on the beam upper flange plate 21; wherein, the three first beam flange holes are uniformly distributed along the axial direction of the I-shaped steel beam 3 and are positioned at one side of the beam web plate 22; the other three first beam flange holes are uniformly distributed along the axial direction of the I-shaped steel beam 3 and are positioned on the other side of the beam web plate 22; six second beam flange holes are uniformly formed in the beam lower flange plate 23, wherein three second beam flange holes are uniformly distributed along the axial direction of the I-shaped steel beam 3 and are positioned on one side of the beam web plate 22; the other three second beam flange holes are uniformly distributed along the axial direction of the I-shaped steel beam 3 and are positioned on the other side of the beam web plate 22; the first beam flange hole 16 and the second beam flange hole are used for fixedly connecting the T-shaped connecting piece 4 with the upper beam flange plate 21 or the lower beam flange plate 23 of the I-shaped steel beam 3 through the third connecting bolt 10; four beam web plate oblong holes 12 are uniformly formed in the beam web plate 22; the web oblong hole 12 is used for connecting the friction member 5 and the web 22 together through a second connecting bolt 9.
Each T-shaped connecting piece 4 comprises a T-shaped part flange plate 24, a T-shaped part web plate 25 and a stiffening plate 29, wherein the T-shaped part flange plate 24 is vertically arranged at the end part of the beam upper flange plate 21 or the beam lower flange plate 23 of the I-shaped steel beam 3; one side of the T-shaped part flange plate 24 is tightly contacted with the side wall of the square steel tube 1, and the other side of the T-shaped part flange plate 24 is tightly contacted with the beam end of the I-shaped steel beam 3; the T-shaped part web plate 25 is horizontally arranged on the upper side of the beam upper flange plate 21 or the lower side of the beam lower flange plate 23 of the I-shaped steel beam 3; the end of the tee web 25 is fixed perpendicular to the tee flange plate 24; the stiffening ribs 29 are vertically fixed on the web plate 25 of the T-shaped part and are arranged far away from one side of the I-shaped steel beam 3; the end of the stiffener 29 is fixed perpendicular to the T-section flange plate 24 and the stiffener 29 lies in the same vertical plane as the web of the i-section beam 3.
Specifically, four T-shaped flange holes 18 are formed in the T-shaped flange plate 24, two of the T-shaped flange holes are located above the beam upper flange plate 21 or above the beam lower flange plate 23 of the i-shaped steel beam 3, and the other two T-shaped flange holes are located below the beam upper flange plate 23 or below the beam lower flange plate 23 of the i-shaped steel beam 3; the T-shaped part flange hole 18 is used for fixedly connecting the T-shaped part flange plate 24 and the square steel tube concrete column 6 together through the SMA screw 7 and the high-strength screw cap 28; six T-shaped piece web holes 17 are formed in the T-shaped piece web 25, wherein three T-shaped piece web holes 17 are uniformly distributed in the length direction of the T-shaped piece web 25 and are positioned on one side of the stiffening rib 29; the other three T-shaped piece web holes 17 are uniformly distributed along the length direction of the T-shaped piece web 25 and are positioned on the other side of the stiffening rib 29; the T-shaped web plate hole 17 is used for fixedly connecting the T-shaped web plate 25 with the I-shaped steel beam 3 through the third connecting bolt 10.
In the embodiment, two friction members are symmetrically arranged on two sides of a web plate of a first I-shaped steel beam, and the other two friction members are symmetrically arranged on two sides of a web plate of a second I-shaped steel beam; each friction member 5 comprises an energy consumption plate 11, a channel steel 26 and an end plate 27; the web plate of the channel steel 26 is vertically arranged and is tightly attached to the beam web plate 22 of the I-shaped steel beam 3; the energy dissipation plate 11 is arranged between a web plate of the channel steel 26 and a beam web plate 22 of the I-shaped steel beam 3, and the energy dissipation plate 11 is a brass friction plate; four channel steel friction holes 13 are uniformly formed in a web plate of the channel steel 26, and four energy dissipation plate holes 14 are uniformly formed in the energy dissipation plate 11; the channel steel friction hole 13, the energy dissipation plate hole 14 and the beam web plate oblong hole 12 are correspondingly arranged; the beam web plate comprises channel steel friction holes 13, energy dissipation plate holes 14 and beam web plate oblong holes 12, and is used for connecting channel steel and energy dissipation plates of two friction members symmetrically arranged on two sides of a beam web plate 22 with the beam web plate 22 through second connecting bolts 9; the end plate 27 is vertically arranged at the end part of the channel steel 26 and is flush with the beam end of the I-shaped steel beam 3; preferably, the end plate 27 and the channel steel 26 are welded and fixed or integrally formed; two channel steel end plate holes 15 are uniformly arranged on the end plate 27, and the two channel steel end plate holes 15 are vertically arranged at intervals; and the channel steel end plate hole 15 is used for fixedly connecting the end plate 27 with the side wall of the square steel tube concrete column 6 through the first connecting bolt 8.
The square steel tube concrete column 6 comprises a square steel tube 1 and concrete 2, and the concrete 2 is filled in the square steel tube 1; eight first column screw holes 19 and four second column screw holes 20 are horizontally formed in the square steel tube concrete column 6; wherein, the four second column screw holes 20 are arranged right opposite to the end part of the friction member 5 and symmetrically distributed at two sides of the beam web plate 22; wherein four first column screw holes are located above the second column screw hole 20, and the other four second column screw holes are located below the second column screw hole 20.
In this embodiment, each first column screw hole 19 is penetrated with an SMA screw 7, and both ends of the SMA screw 7 extend into the first column screw holes 19; two ends of the four SMA screws 7 are respectively arranged by penetrating through four T-shaped part airfoil holes 18 of the first T-shaped connecting piece or four T-shaped part airfoil holes 18 of the third T-shaped connecting piece; two ends of the other four SMA screws 7 are respectively arranged through four T-shaped part flange holes 18 of the second T-shaped connecting piece or four T-shaped part flange holes 18 of the fourth T-shaped connecting piece; and two ends of the SMA screw 7 are screwed and fixed through high-strength nuts 28.
The SMA screw 7 is a dog bone shape SMA bar; the dog-bone-shaped SMA bar comprises a weakening section 71, a transition section 72 and an anchoring section 73, wherein the anchoring sections 73 are symmetrically arranged at two ends of the weakening section 71, and the transition section 72 is arranged between the anchoring section 73 and the weakening section 71; spring gaskets are arranged at the joints of the SMA screw 7 and the T-shaped part flange plate and the high-strength nut 28; wherein the diameter of the anchoring section 73 is larger than the diameter of the weakened section 71, preferably the diameter of the anchoring section 73 is larger than 1.3 times the diameter of the weakened section, so as to avoid premature fracture of the SMA screw at the anchoring section due to stress concentration; the diameter of the weakened section 71 is smaller than the aperture of the first column screw hole 19; preferably, the aperture of the first column screw hole 19 is 1.6 times larger than the diameter of the weakened section 71, so that when the beam-column joint is opened, the SMA screw 7 is prevented from colliding with the hole wall of the first column screw hole 19, and the SMA screw is prevented from being sheared; the transition section is an arc transition section, so that stress concentration on the SMA screw 7 is avoided.
The SMA screw 7 is made of an SMA material; the austenite phase transition finishing temperature of the SMA material is lower than the ambient temperature; the SMA material comprises the components of Ni and Ti with near atomic ratio, and the austenite phase change finishing temperature of the SMA material is lower than the normal temperature so as to ensure that the SMA screw rod is in an austenite state at the normal temperature, thereby realizing the super-elasticity performance of the material; wherein, the SMA screw 7 needs to be subjected to heat treatment before use; specifically, the SMA screw rod is placed in a muffle furnace, and heat treatment operation is carried out at the temperature of 350-400 ℃ for 15-45 min.
In this embodiment, each second column screw hole 20 is penetrated with a first connecting bolt 8, one end of each first connecting bolt 8 is fixedly connected with an end plate of two friction members, and the other end is fixedly connected with an end plate of the other two friction members; the two friction members are positioned on two sides of a web plate of the first I-shaped steel beam, and the other two friction members are positioned on two sides of a web plate of the second I-shaped steel beam; the first connecting bolt 8 penetrates through and is fixed in a channel steel end plate hole 15 of the end plate; the aperture of the second column screw hole 20 is the same as the aperture of the channel steel end plate hole 15.
In the embodiment, the second connecting bolt 9 sequentially penetrates through the channel steel friction hole 13, the energy dissipation plate hole 14 and the beam web plate oblong hole 12; two friction members positioned at two sides of a web plate of a first I-shaped steel beam are connected with the web plate by using a second connecting bolt 9, or two friction members positioned at two sides of a web plate of a second I-shaped steel beam are connected with the web plate; wherein the long axis direction of the beam web plate oblong hole 12 is parallel to the axis direction of the I-shaped steel beam 3.
In this embodiment, the third connecting bolt 10 sequentially penetrates the first beam flange hole 16 and the T-shaped web hole 17, or sequentially penetrates the second beam flange hole and the T-shaped web hole 17; so that the four T-shaped connecting members are fixed to the beam ends of the i-shaped steel beams 3, respectively, by the third connecting bolts 10.
In this embodiment, the first connecting bolt 8, the second connecting bolt 9 and the third connecting bolt 10 are all high-strength bolts; wherein, the high-strength bolt is 12.9-grade high-strength bolt.
The assembling construction method comprises the following steps:
the construction method of the self-resetting composite structure beam-column joint comprises the following steps:
step 1, analyzing nodes, determining the section sizes of an I-shaped steel beam 3, a square steel tube concrete column 6 and a T-shaped connecting piece 4, and determining the mixing proportion of concrete 2; and calculating the type and number of the second connecting bolts 9 required by the node, the size of the beam web oblong hole and the diameter parameter of the SMA screw.
Step 2, prefabricating and processing a square steel pipe 1, an I-shaped steel beam 3, a T-shaped steel connecting piece 4 and a friction member 5 in a factory, and arranging holes at corresponding design positions of the square steel pipe, the I-shaped steel beam, the T-shaped steel connecting piece and the friction member so that a first connecting bolt 8, a second connecting bolt 9, a third connecting bolt 10 and an SMA screw 7 can penetrate through and be anchored; pouring concrete 2 in the square steel tube 1, and curing to obtain a square steel tube concrete column 6; wherein, a stiffening rib 29 is welded between a T-shaped part flange plate 24 and a T-shaped part web plate 25 of the T-shaped steel connecting piece 4, and an end plate 27 is welded at the end part of a channel steel 26 of the friction member 5.
Step 4, mounting a square steel tube concrete column 6; fixedly connecting the T-shaped connecting piece 4 with the I-shaped steel beam 3 by using a third connecting bolt 10; then, hoisting the I-shaped steel beam to a preset installation position, and fixedly connecting the T-shaped connecting piece 4 with the square steel tube concrete column 6 by using the SMA screw 7 so as to fixedly connect the I-shaped steel beam 3 with the square steel tube concrete column 6 together; and then, tensioning the third connecting bolt 10 and the SMA screw 7 to a designed torque value by adopting a torque wrench.
Step 5, fixedly connecting the end plate 27 with the square steel tube concrete column 6 by using a first bolt; and fixedly connecting the channel steel 26 and the brass friction plate 11 together by penetrating the beam web plate 22 through a second connecting bolt, and screwing the second connecting bolt 9 to a designed value, so that the construction of the self-resetting composite structure beam-column joint is completed.
Working or stress principle:
according to the self-resetting composite structure beam-column node, under the action of an earthquake, the beam-column node reciprocates by taking the outermost edge of a T-shaped part flange plate of a T-shaped connecting piece as a rotating center; when the device is normally used, the bending moment of the beam end caused by vertical load is small, the SMA screw rods keep an austenite state and have large rigidity, and the corner between the beam columns is small due to static friction and the pretightening force of the SMA screw rods, so that the requirement of normal use is met; under the action of wind load or earthquake, the relative rotational displacement of the I-shaped steel beam and the square steel tube concrete column is small, and the elongation of the SMA screw rod is small; the second connecting bolt in the friction member slides in the beam web plate oblong hole, so that the brass friction plate and the beam web plate are subjected to friction energy consumption, and the beam-column joint mainly dissipates energy through the reciprocating motion of the SMA screw and the friction member; under the action of medium or large earthquake, the relative rotational displacement of the I-shaped steel beam and the square steel tube concrete column is larger, the elongation of the SMA screw rod is larger, the SMA screw rod enters a phase change stage, even reaches a strain strengthening stage, and dissipates earthquake energy together with the friction member; the beam-column joint realizes self-resetting performance by utilizing the larger restoring force of the SMA screw; under the action of rare earthquakes, the relative rotational displacement of the I-shaped steel beam and the square steel tube concrete column is large, at the moment, the SMA screw enters a strain strengthening stage, and the stiffening ribs enter plastic deformation; the SMA screw, the T-shaped connecting piece and the friction member together dissipate seismic energy; the beam-column joint can realize partial reset by utilizing the larger restoring force of the SMA screw; the T-shaped connecting piece which is subjected to yielding is replaced after the earthquake is ended, so that the purpose of quickly repairing the T-shaped connecting piece after the earthquake happens rarely is achieved; in the whole stress earthquake of the beam column node, the static friction force of the SMA screw and the friction member resist the shearing force together.
The invention relates to a self-resetting composite structure beam column node and a construction method thereof.A beam end of an I-shaped steel beam is arranged in a manner of being clung to a square steel tube concrete column through a T-shaped connecting piece, so that the square steel tube concrete column and the I-shaped steel beam are arranged vertically; the T-shaped connecting pieces are respectively and symmetrically arranged on two sides of the square steel tube concrete column, and are transversely connected through the SMA screw; the SMA screw rod penetrates through the square steel pipe, the concrete and the T-shaped part flange plate, and two ends of the SMA screw rod are screwed and fixed with the T-shaped part flange plate by adopting high-strength screw caps; the friction members are symmetrically arranged on two sides of a web plate of the I-shaped steel beam, and channel steel, a brass friction plate and the web plate in the friction members are fixedly connected together through high-strength bolts; according to the invention, the T-shaped connecting piece is used as a beam-column connecting element, the friction member is used as an energy dissipation element, the SMA screw is used as a reset element, the stress is clear, the structure is simple, the production and assembly are convenient, the construction process is similar to the traditional node, and the interference with other structural spaces is small; the deformation of the beam-column joint can be concentrated on the SMA screw rod, so that the beam-column is kept in an elastic state, the residual deformation can be reduced to the maximum extent, and the post-earthquake repair and reconstruction work is reduced; by adding the brass friction plate, the energy dissipation capacity of the node is increased on the premise that the node meets the requirement of resetting, and the hysteretic energy consumption capacity of the node can be adjusted by adjusting the pre-tightening force of the corresponding high-strength bolt.
According to the invention, the super elasticity of the SMA screw is combined with the pre-strain of the screw, so that the rigidity and the self-resetting capability of the node are improved, and the rigidity and the self-resetting capability of the node can be adjusted by adjusting the diameter and the length of the SMA screw; by arranging the friction member, the shearing resistance of the node can be effectively improved; welding processes in all components are completed in a factory, and the components are transported to a site for direct assembly after being prefabricated in the factory, so that assembly is realized, and labor cost is reduced.
The self-resetting composite structure beam-column node has higher hysteresis performance and self-resetting capability, resetting and friction webs are provided through the superelasticity of the SMA screw to realize hysteresis energy consumption, and the defects of insufficient hysteresis energy consumption, large residual deformation after unloading and simple node structure of a common SMA beam-column node are overcome; the energy-saving device has the advantages of high energy consumption during earthquake, small residual after the earthquake and replaceability after rare earthquakes, and is particularly suitable for structures with strict requirements on residual deformation of the structures after the earthquake.
The above-described embodiment is only one of the embodiments that can implement the technical solution of the present invention, and the scope of the present invention is not limited by the embodiment, but includes any variations, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed.
Claims (10)
1. A self-resetting composite structure beam column node is characterized by comprising an I-shaped steel beam (3), a T-shaped connecting piece (4), a friction member (5), a square steel tube concrete column (6) and an SMA screw (7);
the I-shaped steel beam (3) is horizontally arranged on the side edge of the square steel tube concrete column (6), and the T-shaped connecting pieces (4) are symmetrically arranged on the outer side of the beam end of the I-shaped steel beam (3) from top to bottom; one end of the T-shaped connecting piece (4) is fixed with a flange plate of the I-shaped steel beam (3) through a third connecting bolt (10), and the other end of the T-shaped connecting piece is connected with a square steel tube concrete column (6) through an SMA screw (7);
the friction members (5) are symmetrically arranged on two sides of a web plate of the I-shaped steel beam (3), one end of each friction member (5) is fixed to the side wall of the square steel tube concrete column (6) through a first connecting bolt (8), and the other end of each friction member is connected with the web plate of the I-shaped steel beam (3) through a second connecting bolt (9).
2. A self-resetting composite structural beam-column joint according to claim 1, wherein the T-shaped connector (4) comprises a T-shaped flange plate (24) and a T-shaped web plate (25); the T-shaped part flange plate (24) is vertically arranged at the end part of the upper flange or the lower flange of the I-shaped steel beam (3), and one side of the T-shaped part flange plate (24) is tightly contacted with the side wall of the square steel tube concrete column (6); the T-shaped part web plate (25) is horizontally arranged on the upper side of the upper flange or the lower side of the lower flange of the I-shaped steel beam (3), and the end part of the T-shaped part web plate (25) is vertically fixed with the T-shaped part flange plate (24);
the SMA screw (7) horizontally penetrates through the square steel tube concrete column (6), and two ends of the SMA screw (7) extend to the outer side of the side wall of the square steel tube concrete column (6); the end part of the SMA screw rod (7) penetrates through a T-shaped part flange plate (24) and is screwed and fixed through a high-strength screw cap (28); the T-shaped part web plate (25) and the upper flange or the lower flange of the I-shaped steel beam (3) are fixed by a third connecting bolt (10).
3. A self-resetting composite structural beam-column joint according to claim 2, wherein the T-shaped connector (4) further comprises a stiffener (29); the stiffening ribs (29) are vertically fixed on the T-shaped part web plate (25) and are arranged far away from one side of the I-shaped steel beam (3), and the end parts of the stiffening ribs (29) are vertically fixed with the T-shaped part flange plate (24); the stiffening ribs (29) and the web plate of the I-shaped steel beam (3) are positioned in the same vertical plane.
4. A self-resetting composite structural beam-column joint according to claim 2, wherein the square steel tubular concrete column (6) is provided with a first column screw hole (19); the first column screw holes (19) are arranged in one-to-one correspondence with the SMA screw rods (7), and the SMA screw rods (7) horizontally penetrate through the first column screw holes (19); wherein the aperture of the first column screw hole (19) is larger than the diameter of the SMA screw rod (7).
5. A self-resetting composite structural beam-column joint according to claim 1, wherein the friction member (5) comprises a dissipative plate (11), a channel (26) and an end plate (27); the web plate of the channel steel (26) is vertically arranged and is tightly attached to the web plate of the I-shaped steel beam (3); the energy dissipation plate (11) is arranged between a web plate of the channel steel (26) and a web plate of the I-shaped steel beam (3), and the web plate of the channel steel (26), the energy dissipation plate (11) and the web plate of the I-shaped steel beam (3) are fixedly connected together through a second connecting bolt (9); the end plate (27) is vertically arranged at the end part of the channel steel (26) and is flush with the beam end of the I-shaped steel beam (3); the end plate (27) and the square steel tube concrete column (6) are fixedly connected together through a first connecting bolt (8);
a web plate of the I-shaped steel beam (3) is uniformly provided with a plurality of beam web plate oblong holes (12), a web plate of the channel steel (26) is uniformly provided with a plurality of channel steel friction holes (13), and a plurality of energy dissipation plate holes (14) are uniformly arranged on the energy dissipation plate (11); the beam web plate long round hole (12), the channel steel friction hole (13) and the energy consumption plate hole (14) are correspondingly arranged, and the second connecting bolt (9) sequentially penetrates through the channel steel friction hole (13), the energy consumption plate hole (14) and the beam web plate long round hole (12); wherein, the long axis direction of the beam web oblong hole (12) is parallel to the axial direction of the I-shaped steel beam (3).
6. A self-resetting composite structural beam-column joint according to claim 5, wherein the energy dissipation plate (11) is a brass friction plate.
7. The self-resetting composite structure beam-column joint according to claim 1, wherein the SMA screw (7) is made of a dog-bone-shaped SMA rod; the dog-bone-shaped SMA bar comprises a weakening section (71), a transition section (72) and two anchoring sections (73), wherein the two anchoring sections (73) are symmetrically arranged at two ends of the weakening section (71), and the transition section (72) is arranged between the anchoring sections (73) and the weakening section (71); wherein the diameter of the anchoring section (73) is larger than the diameter of the weakening section (71).
8. The self-resetting composite structure beam-column joint according to claim 1, wherein the SMA screw (7) is made of an SMA material; the austenite phase transition finishing temperature of the SMA material is lower than the ambient temperature.
9. The construction method of a self-resetting composite structure beam-column joint according to any one of claims 1 to 8, characterized by comprising the following steps:
mounting the T-shaped connecting piece (4) at the beam end of the I-shaped steel beam (3) by using a third connecting bolt (10);
hoisting the I-shaped steel beam (3) to a preset installation position, and fixedly connecting the T-shaped connecting piece (4) with the square steel tube concrete column (6) by using an SMA screw (7) so as to fixedly connect the I-shaped steel beam (3) with the square steel tube concrete column (6);
the friction members (5) are symmetrically arranged on two sides of a web plate of the I-shaped steel beam (3), one end of each friction member (5) is fixed to the side wall of the square steel tube concrete column (6) through a first connecting bolt (8), and the other end of each friction member (5) is fixed to the web plate of the I-shaped steel beam (3) through a second connecting bolt (9).
10. The construction method of the self-resetting composite structure beam-column joint according to claim 9, characterized in that the SMA screw (7) needs to be subjected to heat treatment before use; the heat treatment process specifically comprises the following steps:
and (3) placing the SMA screw in a muffle furnace, and carrying out heat treatment operation at the temperature of 350-400 ℃ for 15-45 min.
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| CN116517131A (en) * | 2022-12-01 | 2023-08-01 | 北京工业大学 | Hysteresis-variable self-resetting combined disc spring U-shaped metal energy dissipation damper |
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| TWI837047B (en) * | 2023-07-28 | 2024-03-21 | 國立臺灣科技大學 | Part-span side sealing plate anti-frustration buckling method |
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