A shock absorbing composite beam and a method of construction thereof

Abstract

The application provides a damping composite beam and a construction method thereof. The damping composite beam comprises a U-shaped steel plate, a thin-walled steel plate welded between two side plates of the U-shaped steel plate, a placing cavity and a pouring area formed between the U-shaped steel plate and the thin-walled steel plate, a plurality of rib plates placed in the pouring area and welded to the side plates and the thin-walled steel plate, UHPC elastic pieces placed in the placing cavity, end plates welded to two end faces of the U-shaped steel plate, and an ECC outer shell poured outside the U-shaped steel plate. Shear bolts are arranged on the side plates and the end plates. High-strength screw rods are further connected to the end plates. High-strength concrete is poured in the pouring area. The U-shaped steel plate is used as an inner shell, and the thin-walled steel plate and the rib plates are connected at the opening of the U-shaped steel plate, so that the local buckling of the steel plate can be effectively prevented, the stability is enhanced, the rib plates can provide binding force for the beam, the shear resistance, the compression resistance and other performances can be improved, the steel bars are not needed in the cross section, and the amount of the steel bars is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building, in particular to a damping composite beam and a construction method thereof. BACKGROUND

[0002] With the transformation and upgrading of the construction industry structure, in order to improve the performance of the structure or component of the fabricated building under the influence of earthquake, the seismic capacity of the fabricated building is more and more concerned and valued by the engineering field. At present, the fabricated damping energy dissipation beam on the market is mostly provided with energy dissipation devices at both ends of the beam, but such beam still has many problems in building structure, for example, the structure is relatively complex, the node connection is complex, which leads to slow construction efficiency, time-consuming and laborious; meanwhile, the existing energy dissipation device is usually connected with energy dissipation steel plate or energy dissipation steel at both ends of the beam, and the mechanical property and energy dissipation capacity of this mode are poor, which leads to limited seismic capacity. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a damping composite beam and a construction method thereof to solve the above problems.

[0004] The present application adopts the following scheme:

[0005] The present application provides a damping composite beam, which comprises a U-shaped steel plate, a thin-walled steel plate welded between two side plates of the U-shaped steel plate, a placing cavity and a pouring area formed between the U-shaped steel plate and the thin-walled steel plate, a plurality of rib plates placed in the pouring area and welded on the side plates and the thin-walled steel plate, a UHPC elastic piece placed in the placing cavity, end plates welded on both end faces of the U-shaped steel plate, and an ECC outer shell poured on the outside of the U-shaped steel plate; shear-resistant studs are arranged on the side plates and the end plates; high-strength screws are further connected to the end plates; and high-strength concrete is poured in the pouring area.

[0006] Further, the thin-walled steel plate is welded on the side plates with the net width of the inner side of the bottom plate of the U-shaped steel plate as the net height length.

[0007] Further, the rib plate is provided with an opening on the side connected to the thin-walled steel plate.

[0008] Further, the end plate is further provided with a spring placed in the placing cavity.

[0009] Further, the UHPC elastic piece is formed by pouring ultra-high performance concrete.

[0010] Further, the UHPC elastic piece is spherical.

[0011] Further, the high-strength concrete is concrete with a strength grade greater than C50.

[0012] The application further provides a construction method of the shock-absorbing composite beam.

[0013] S1: welding the steel plate into the U-shaped steel plate, then welding the thin-walled steel plate and the rib plate inside the U-shaped steel plate, and welding the shear bolt on the side plate;

[0014] S2: welding the shear bolt on the end plate and reserving the screw hole on the end plate;

[0015] S3: manufacturing the UHPC elastic piece and sampling and detecting the corresponding performance;

[0016] S4: welding the end plate on one end surface of the U-shaped steel plate, then placing the UHPC elastic piece in the placing cavity from the other end of the U-shaped steel plate, and finally welding another end plate on the other end surface of the U-shaped steel plate;

[0017] S5: setting the high-strength screw pre-buried through the screw hole and locking the nut;

[0018] S6: supporting and pouring the outer shell ECC, after the outer shell ECC is demolded, pouring the high-strength concrete in the pouring area or transferring to the construction site to pour the high-strength concrete in the pouring area, and finally performing maintenance.

[0019] Further, the end plate is further welded with a spring in step S2.

[0020] By adopting the above technical scheme, the application can achieve the following technical effects:

[0021] 1. The U-shaped steel plate is used as the inner shell, and the thin-walled steel plate and the rib plate are connected at the opening of the U-shaped steel plate, which can effectively prevent local buckling of the steel plate, enhance stability, and the rib plate can provide restraint force for the beam, improve shear resistance, compression resistance and other performances, and can make the cross section not need to use steel bars, effectively reducing the amount of steel bars, and the rib plate can improve the connection between the high-strength concrete and the inner shell of the U-shaped steel plate, resist the relative slip between the high-strength concrete and the steel plate, and improve the overall performance of the component;

[0022] 2. The high-strength screw is pre-buried on the end plate on both sides of the energy dissipation beam end, which can be connected to the beam end plate of the beam-column assembly, plays a role in connecting and fixing the beam-column structure, bears the role of longitudinal reinforcement, can effectively resist deformation and transfer force, strengthens the overall performance of the connection, and is convenient for the connection between the beam and the column, and improves the portability of construction;

[0023] 3. The outer shell formed by ECC pouring improves the stability, ductility and fire resistance of the beam as a whole, and has good mechanical properties and good stress performance;

[0024] 4. The UHPC elastic piece is placed in the placing cavity, can consume energy and reduce damage caused by earthquake effect under the action of earthquake, improves the seismic performance of the component, the self-weight of the UHPC elastic piece is large, the strength is high, the material is easy to obtain, the steel fiber and mineral material are applied, the cement material is reduced, the carbon emission is reduced, and the green development is responded. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Fig. 1 is a schematic diagram of a damping composite beam structure according to an embodiment of the present application;

[0027] Fig. 2 is a schematic diagram of a partial assembly structure of the inside of a damping composite beam according to an embodiment of the present application;

[0028] Fig. 3 is a schematic diagram of a partial assembly structure of an end plate of a damping composite beam according to an embodiment of the present application;

[0029] Figure: ECC shell 1, U-shaped steel plate 2, shear bolt 3, rib plate 4, thin-walled steel plate 5, high-strength screw rod 6, end plate 7, spring 8, high-strength concrete 9, UHPC elastic piece 10. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] EMBODIMENT

[0032] COMBINATION Figs. 1 to 3As shown, this embodiment provides a shock-absorbing composite beam, comprising a U-shaped steel plate 2, a thin-walled steel plate 5 welded between the two side plates of the U-shaped steel plate 2, a placement cavity and a casting area formed between the U-shaped steel plate 2 and the thin-walled steel plate 5, a plurality of ribs 4 placed in the casting area and welded to the side plates and the thin-walled steel plate 5, a UHPC elastic member 10 placed in the placement cavity, end plates 7 welded to the two end surfaces of the U-shaped steel plate 2, and an ECC shell 1 cast on the outside of the U-shaped steel plate 2; shear bolts 3 are provided on the side plates and the end plates 7; high-strength screws 6 are also connected to the end plates 7; and high-strength concrete 9 is cast in the casting area.

[0033] Specifically, in this embodiment, the UHPC elastic member 10 is an elastic ball cast from ultra-high-performance concrete. Its matrix is ​​composed of cement, quartz sand, water, mineral admixtures, chemical admixtures such as high-efficiency water reducers, and steel fibers, with a strength exceeding 120 MPa. The thin-walled steel plate 5 is welded to the side plate, using the net width of the bottom plate of the U-shaped steel plate 2 as its net height to ensure the range of motion of the UHPC elastic ball and the relative height of the compression zone. Ribs 4 are welded to the top surface of the thin-walled steel plate 5 at appropriate spacings. The ribs 4 are also steel plates, and their spacing is determined based on actual requirements to ensure that the ribs 4 meet the strength and stability requirements of the compression side. The ribs 4 are also provided with an opening on the side where they connect to the thin-walled steel plate 5, facilitating the pouring of high-strength concrete and reducing steel utilization. The end plate 7 is also provided with multiple springs 8 at intervals, which are placed in the placement cavity and act on the UHPC elastic ball. Shear studs 3 are installed at appropriate intervals on the side panels and end panels 7 to meet the strength requirements for the connection between the U-shaped steel panels 2 and the high-strength concrete. The high-strength concrete 9 has a strength grade greater than C50. By properly calculating the steel plate ratio, the appropriate use of high-strength concrete can improve the bearing capacity of the beam's compression zone without compromising beam ductility. High-strength screws 6 are pre-embedded at appropriate intervals on the outer perimeter of the end panels 7 on both sides to meet the required connection strength between the end panels 7. These screws are used to connect the beam-column assembly's end panels 7.

[0034] It should be noted that the ECC shell 1 is a "high-ductility fiber-reinforced cement-based composite material", which is composed of a matrix of cement, sand, water, mineral admixtures and chemical admixtures, and uses high-strength and high-elastic modulus short fibers with a fiber volume content of less than 3% as toughening materials. After hardening, it is a new type of high-performance fiber-reinforced cement-based composite material with strain hardening and multiple stable cracking characteristics, which can further improve the compressive strength and toughness, and is also beneficial to the concrete interface bonding, thereby improving the durability of the concrete.

[0035] The U-shaped steel plate 2 is used as an inner shell, and the thin-walled steel plate 5 and the rib plate 4 are connected at the opening of the U-shaped steel plate, so that the local buckling of the steel plate can be effectively prevented, the stability is enhanced, the rib plate 4 can provide a binding force for the beam, the shear resistance, compression resistance and other performances can be improved, the cross section does not need to use steel bars, the amount of steel bars is effectively reduced, in addition, the rib plate 4 can improve the connection between the high-strength concrete and the inner shell of the U-shaped steel plate 2, resist the relative sliding between the high-strength concrete and the steel plate, and improve the overall performance of the component.

[0036] The high-strength screw rod 6 is embedded on the end plate 7 on both sides of the beam end of the energy dissipation beam, can be connected to the end plate 7 of the beam end of the beam-column combination, plays a role in connecting and fixing the beam-column structure, bears the role of longitudinal reinforcement, can effectively resist deformation and transmit force, strengthens the overall performance of the connection, facilitates the connection between the beam and the column, and improves the construction portability.

[0037] The outer shell formed by pouring the ECC improves the stability, ductility and fire resistance of the beam as a whole, and has good mechanical properties and good stress performance.

[0038] The UHPC elastic piece 10 is placed in the placement cavity, which can consume energy and reduce the damage caused by the earthquake effect under the action of the earthquake, and improves the seismic performance of the component, and the UHPC elastic piece 10 has high self-weight and high strength, is easy to obtain, uses steel fibers and mineral materials, reduces cement materials, reduces carbon emissions, and responds to green development.

[0039] The application also provides a construction method of the shock absorption composite beam.

[0040] S1: the steel plate is welded into the U-shaped steel plate 2, then the thin-walled steel plate 5 and the rib plate 4 are welded in the inside of the U-shaped steel plate 2, and the shear bolt 3 is welded on the side plate;

[0041] S2: the shear bolt 3 is welded on the end plate 7, and a screw rod hole is reserved on the end plate 7;

[0042] S3: the UHPC elastic piece 10 is made, and the corresponding performance is detected by sampling;

[0043] S4: the end plate 7 is welded on one end surface of the U-shaped steel plate 2, then the UHPC elastic piece 10 is placed in the placement cavity from the other end of the U-shaped steel plate 2, and finally another end plate 7 is welded on the other end surface of the U-shaped steel plate 2;

[0044] S5: the high-strength screw rod 6 is arranged in the high-strength screw rod 6 hole in a pre-embedded manner, and the nut is locked;

[0045] S6: pouring the ECC shell 1, after the ECC shell 1 is demoulded, pouring the high-strength concrete of the pouring area or transporting to the construction site to pour the high-strength concrete of the pouring area, and finally curing.

[0046] It should be noted that steps S1-S3 can be produced synchronously in a factory, then welded and assembled, and finally the high-strength concrete is poured or transported to the construction site to pour the high-strength concrete. The structural members of each part are prefabricated members, which are simple in structure, convenient to construct, easy to transport and assemble.

[0047] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application belongs to the protection scope of the present application.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0050] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless specifically stated and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

Claims

1. A shock-absorbing composite beam, characterized in that: It includes a U-shaped steel plate, a thin-walled steel plate welded between the two side plates of the U-shaped steel plate, and a placement cavity and a casting area are formed between the U-shaped steel plate and the thin-walled steel plate, a plurality of ribs placed in the casting area and welded to the side plates and the thin-walled steel plate, a UHPC elastic part placed in the placement cavity, end plates welded to the two end surfaces of the U-shaped steel plate, and an ECC shell cast on the outside of the U-shaped steel plate; shear bolts are provided on the side plates and the end plates; high-strength screws are also connected to the end plates; high-strength concrete is cast in the casting area.

2. The shock-absorbing composite beam according to claim 1, characterized in that: The thin-walled steel plate is welded to the side plate with the inner net width of the bottom plate of the U-shaped steel plate as the net height length.

3. The shock-absorbing composite beam according to claim 1, characterized in that: The rib is provided with an opening on one side where the thin-walled steel plate is connected.

4. The shock-absorbing composite beam according to claim 1, characterized in that: The end plate is also provided with a spring which is placed in the placement cavity.

5. The shock-absorbing composite beam according to claim 1, characterized in that: The UHPC elastic member is formed by pouring ultra-high performance concrete.

6. The shock-absorbing composite beam according to claim 4, characterized in that: The UHPC elastic member is spherical.

7. The shock-absorbing composite beam according to claim 1, characterized in that: The high-strength concrete is concrete with a strength grade greater than C50.

8. A construction method for a shock-absorbing composite beam, characterized in that: The shock-absorbing composite beam is the shock-absorbing composite beam according to any one of claims 1 to 7, and the construction steps thereof include: S1: Welding the steel plates into the U-shaped steel plates, then welding the thin-walled steel plates and the ribs inside the U-shaped steel plates, and welding the shear studs on the side plates; S2: Welding the shear bolts on the end plates and reserving screw holes on the end plates; S3: manufacturing the UHPC elastic member and taking samples to test corresponding properties; S4: welding the end plate to one end surface of the U-shaped steel plate, then placing the UHPC elastic member into the placement cavity from the other end of the U-shaped steel plate, and finally welding another end plate to the other end surface of the U-shaped steel plate; S5: Install the pre-buried high-strength screw through the screw hole and lock the nut; S6: supporting the formwork and casting the shell ECC. After the shell ECC is demoulded, high-strength concrete is cast in the casting area or the shell is transported to the construction site for casting high-strength concrete in the casting area, and finally curing is performed.

9. The construction method of the shock-absorbing composite beam according to claim 8, characterized in that: In step S2 , a spring is welded to the end plate.

Images