A bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam

Abstract

The application provides a bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam, which comprises an upper UHPC panel and a lower panel; wherein the upper UHPC panel and the lower panel are arranged in an upper and lower mode; a transverse corrugated truss arranged along a transverse direction and a longitudinal corrugated truss arranged along a longitudinal direction are arranged between the upper UHPC panel and the lower panel; and the transverse corrugated truss and the longitudinal corrugated truss are arranged at a 90-degree angle and cross each other. The application utilizes the high bearing and high deformation performance of the corrugated truss grid, the high ductility and high strength characteristics of the ECC and UHPC materials, effectively improves the bearing capacity of the composite beam, increases the ductility energy dissipation capacity of the composite beam, and has the advantages of light weight, high strength, and easy prefabrication and installation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new material combination structure bridge and steel-concrete composite bridge, in particular to a bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam. BACKGROUND

[0002] Truss is a commonly used structure form in bridge structure. Generally, ordinary concrete bridge deck slab is arranged on the lower chord of the truss to form a composite beam bridge. However, harmful substances in the environment can cause serious corrosion to the steel parts in the concrete slab, thereby greatly reducing the stiffness and durability of the composite beam, increasing the operation and maintenance cost, and even threatening the normal use of the bridge. If all high-performance materials such as ECC, UHPC, etc. are used, the defects of insufficient durability can be overcome, but the cost is high, the conditions for construction and maintenance are harsh, and it is not conducive to large-scale popularization and application. Therefore, the truss structure and the slab made of high-performance materials can be combined to form a new type of composite beam.

[0003] In the patent with publication number CN111749114A, a steel truss-UHPC composite beam bridge negative moment area structure and construction method are disclosed, which relates to the technical field of bridge structure. It includes a steel truss beam and a UHPC bridge deck slab. The steel truss beam includes two main trusses arranged transversely and connected, each main truss includes a lower chord and an upper chord, and the lower chord is filled with UHPC. The UHPC bridge deck slab is connected to the upper surface of the two upper chords. Vertical web members are provided between the upper chords and the lower chords, and compression web members and tension web members are alternately and symmetrically arranged on both sides of the vertical web members. The lower chord and the upper chord are connected by integral node plates at the nodes. The present application aims to solve the technical problems of existing steel truss beams, which are prone to compression instability, bridge deck slab cracking, and node fatigue damage. UHPC is used as the bridge deck slab. The purpose of the present application is to propose a new type of bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam, which is completely different from the structure form and purpose of the present application.

[0004] In the patent with publication number CN112227176A, a type steel is disclosed, including an upper flange plate and a web plate, the end of the upper flange plate and / or the web plate extends outwardly and is provided with an extension section. The invention also discloses a type steel, including an upper flange plate, a web plate and a lower flange plate, at least one of the end of the upper flange plate, the web plate and the lower flange plate extends outwardly and is provided with an extension section. The invention also provides a type steel-UHPC composite plate, including a UHPC plate and a plurality of the above type steels, the UHPC plate is arranged on the upper flange plate of the type steel. The invention also provides a bridge deck plate and a steel-UHPC composite beam bridge. The end of the type steel is structurally optimized, so that the type steel has an outward extension section. When the type steel-UHPC composite plate obtained by using the above type steel is connected by using a wet joint, the joint force transmission is more reliable, the tensile capacity is strong, the stiffness is large, and various stress conditions such as tension, compression, bending, shear and torsion can be resisted, and the joint can satisfy the full cross-section tension condition. The invention proposes a combined structure bridge formed by type steel and UHPC, while the invention is a combined beam formed by bidirectional cross truss and ECC / UHPC, which is completely different in structure.

[0005] In the patent with publication number CN113931064A, a bridge deck plate, steel channel beam, beam bridge and construction method for steel-UHPC composite beam bridge are provided to solve the technical problems of heavy bridge structure, low span and poor crack resistance of concrete bridge deck plate of steel-UHPC composite beam bridge. The bridge deck plate is a one-way rib UHPC bridge deck plate, which includes a thin bridge deck plate body and a plurality of UHPC cross ribs integrally formed on the bottom of the bridge deck plate body. The one-way rib UHPC bridge deck plate does not have longitudinal ribs. The steel channel beam is a U-shaped channel beam, which includes a bottom plate, web plates connected to both sides of the bottom plate, and flange plates connected to the top surface of the web plates. The bottom plate and the web plate are both provided with longitudinal bridge direction stiffening ribs. The beam bridge includes a plurality of whole-hole simply supported beams connected to each other along the longitudinal direction of the bridge. The whole-hole simply supported beam includes a one-way rib UHPC bridge deck plate and a steel channel beam and a shear key. The beam bridge adopts a mode of first forming whole-hole simply supported beams in the factory and then hoisting on site. The invention proposes a combined beam bridge formed by steel channel beam and UHPC bridge deck plate, while the invention is a combined beam formed by bidirectional cross truss and ECC / UHPC, which is completely different in structure.

[0006] In summary, in the existing patents, the focus is on the combined structure bridge formed by the lower type steel, channel steel and the upper UHPC bridge deck plate, while the structure of the invention is a bidirectional sandwich truss structure arranged in the middle and a sandwich structure beam composed of lower ECC / UHPC deck and upper UHPC deck. The structures are completely different. In addition, the purpose of the invention is to utilize the excellent properties of high-performance materials to extend the service life of the structure. At the same time, the bidirectional sandwich truss in the middle can reduce the self-weight of the composite beam, reduce the material consumption, and is beneficial to factory prefabrication and cost reduction. SUMMARY

[0007] To solve the above problems, the application discloses a bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam, which utilizes the high bearing and high deformation performance of the corrugated truss grid, the high ductility and high strength characteristics of the ECC and UHPC materials, effectively improves the bearing capacity of the composite beam, increases the ductility energy dissipation capacity of the composite beam, and has the advantages of light weight, high strength and easy prefabrication and installation.

[0008] The application is realized by the following technical scheme:

[0009] A bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam comprises an upper UHPC panel and a lower panel, wherein the upper UHPC panel and the lower panel are arranged above and below; a transverse corrugated truss arranged along a transverse direction and a longitudinal corrugated truss arranged along a longitudinal direction are arranged between the upper UHPC panel and the lower panel, wherein the transverse corrugated truss and the longitudinal corrugated truss are arranged at a 90-degree angle and cross each other.

[0010] Preferably, the transverse corrugated truss comprises a first upper chord, a first web and a first lower chord, which are connected together by welding; the longitudinal corrugated truss comprises a second upper chord, a second web and a second lower chord, which are connected together by welding.

[0011] Preferably, the first upper chord, the first web, the first lower chord, the second upper chord, the second web and the second lower chord are made of round steel pipes, square steel pipes, angle steels or profile steels.

[0012] Preferably, the first upper chord and the second upper chord are connected to the upper UHPC panel through upper composite shear keys; the number and positions of the upper composite shear keys are matched with upper grooves arranged on the upper ECC panel.

[0013] Preferably, the first lower chord and the second lower chord are connected to the lower panel through lower composite shear keys; the number of the lower composite shear keys is matched with the number of lower grooves arranged on the lower panel.

[0014] Preferably, the lower panel comprises an ECC layer and a UHPC layer, the ECC layer and the UHPC layer are engaged together through a toothed connection, and a thin glue layer is arranged between the ECC layer and the UHPC layer to increase the bonding strength therebetween.

[0015] Preferably, the upper composite shear key comprises an upper perforated vertical steel plate, an upper transverse through steel bar and an upper nut; the upper perforated vertical steel plate of the upper composite shear key is embedded into the upper groove of the upper UHPC panel; the upper transverse through steel bar passes through the upper transverse hole of the upper UHPC panel and the upper hole of the upper perforated vertical steel plate along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut, and the high-performance cement mortar is filled in the upper transverse hole.

[0016] Preferably, the lower composite shear key comprises a lower perforated vertical steel plate, a lower transverse through steel bar and a lower nut; the lower perforated vertical steel plate of the lower composite shear key is embedded into the lower groove of the UHPC layer of the lower panel; the lower transverse through steel bar passes through the lower transverse hole of the lower panel and the lower hole of the lower perforated vertical steel plate along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the lower nut, and the high-performance cement mortar is filled in the lower transverse hole.

[0017] Preferably, the lower transverse hole is arranged at the middle position of the thickness of the UHPC layer.

[0018] An implementation method of a corrugated truss grid sandwich ECC / UHPC composite beam, comprising the following implementation steps:

[0019] (1) The lower panel is made according to the design requirements, and the lower composite shear key is embedded into the lower groove of the UHPC layer of the lower panel.

[0020] (2) The lower transverse through steel bar passes through the lower transverse hole of the lower panel and the lower hole of the lower perforated vertical steel plate along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut, and the high-performance cement mortar is filled in the lower transverse hole.

[0021] (3) The upper UHPC panel is made according to the design requirements, and the upper composite shear key is embedded into the upper groove of the upper UHPC panel (1).

[0022] (4) The upper transverse through steel bar passes through the upper transverse hole of the upper UHPC panel and the upper hole of the upper perforated vertical steel plate along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut, and the high-performance cement mortar is filled in the upper transverse hole, to form the corrugated truss grid sandwich ECC / UHPC composite beam.

[0023] The beneficial effects of the present application are as follows:

[0024] 1. High bearing capacity and good ductility. The bidirectional cross corrugated truss, the high-strength and high-deformation performance material ECC and UHPC are combined in the application, so that the bearing capacity of the composite beam can be effectively improved, the deformation capacity of the composite beam is increased, the ductility is good, and brittle failure of the composite beam is avoided.

[0025] 2. Light weight and high prefabrication degree. The bidirectional cross corrugated truss forms a hollow structure, so that the self weight of the composite beam can be effectively reduced. The thickness of the UHPC upper panel and the UHPC lower panel is effectively reduced by using the high-strength characteristics of the high-performance material UHPC, so that the self weight is reduced. Meanwhile, the UHPC upper panel and the UHPC lower panel and the bidirectional cross corrugated truss can be prefabricated in a factory, and on-site assembly is convenient, construction is convenient, and construction efficiency is effectively improved.

[0026] 3. Good durability, low maintenance cost and wide application. The UHPC upper panel and the UHPC lower panel of the composite beam have good durability and low maintenance cost. The composite beam structure provided by the application can not only be used for the main beam of a bridge structure, but also can be applied to the outside of a bridge pier by using the high deformation and high energy consumption characteristics of the composite beam, so as to resist ship impact. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of a bidirectional cross corrugated truss grid sandwich ECC / UHPC composite beam of the application;

[0028] Figure 2 is a schematic diagram of a longitudinal corrugated truss of the application;

[0029] Figure 3 is a schematic diagram of a transverse corrugated truss of the application;

[0030] Figure 4 is a schematic diagram of the connection between the ECC layer and the UHPC layer in the lower panel of the application;

[0031] Figure 5 is a schematic diagram of the structure of the connection between the upper UHPC panel and the upper composite shear key (5) of the application;

[0032] Figure 6 is a schematic diagram of the structure of the connection between the upper UHPC panel and the upper composite shear key (5) of the application;

[0033] Figure 7 is a schematic diagram of the structure of the connection between the lower panel and the lower composite shear key (6) of the application;

[0034] Figure 8 is a schematic diagram of the structure of the connection between the lower panel and the lower composite shear key (6) of the application;

[0035] In the diagram: 1-Upper UHPC panel, 2-Lower panel, 3-Transverse corrugated truss, 4-Longitudinal corrugated truss, 5-Upper composite shear key, 6-Lower composite shear key, 7-Thin adhesive layer, 38-First upper chord, 39-First web member, 30-First lower chord, 48-Second upper chord, 49-Second web member, 40-Second lower chord, 11-Upper transverse hole, 21-Lower transverse hole, 23-Toothed connection, 51-Upper perforated vertical steel plate, 52-Upper transverse through-bar reinforcement, 53-Upper nut, 61-Lower perforated vertical steel plate, 62-Lower transverse through-bar reinforcement, 63-Lower nut, 111-Upper groove, 222-Lower groove, 511-Upper hole, 611-Lower hole, 21A-ECC layer, 21B-UHPC layer. Detailed Implementation

[0036] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0037] like Figures 1-5 As shown, a bidirectional intersecting corrugated truss mesh sandwich ECC / UHPC composite beam of this embodiment includes an upper UHPC panel 1 and a lower panel 2; wherein the upper UHPC panel 1 and the lower panel 2 are arranged on top of each other; between the upper UHPC panel 1 and the lower panel 2, there are transverse corrugated trusses 3 arranged in the transverse direction and longitudinal corrugated trusses 4 arranged in the longitudinal direction, wherein the transverse corrugated trusses 3 and the longitudinal corrugated trusses 4 are arranged to intersect each other at a 90-degree angle.

[0038] The transverse corrugated truss 3 includes a first upper chord 38, a first web member 39, and a first lower chord 30, which are connected together by welding; the longitudinal corrugated truss 4 includes a second upper chord 48, a second web member 49, and a second lower chord 40, which are connected together by welding.

[0039] The first upper chord 38, the first web member 39, the first lower chord 30, the second upper chord 48, the second web member 49, and the second lower chord 40 are made of round steel pipe, square steel pipe, angle steel, or shaped steel.

[0040] The first upper chord 38 and the second upper chord 48 are both connected to the upper UHPC panel 1 via upper composite shear keys 5; the number and position of the upper composite shear keys 5 are adapted to the upper grooves 111 provided on the upper ECC panel 1.

[0041] The first lower chord 30 and the second lower chord 40 are connected with the lower panel 2 through the lower composite shear key 6; wherein the number and position of the lower composite shear key 6 are adapted to the number of the lower groove 222 provided on the lower panel 2.

[0042] The lower panel 2 comprises an ECC layer 21A and a UHPC layer 21B, the ECC layer 21A and the UHPC layer 21B are engaged together through the way of tooth connection, and the thin layer of glue 7 is used to increase the bonding strength between the ECC layer 21A and the UHPC layer 21B.

[0043] The upper composite shear key 5 comprises an upper perforated vertical steel plate 51, an upper transverse through steel bar 52 and an upper nut 53. The upper perforated vertical steel plate 51 of the upper composite shear key 5 is embedded into the upper groove 111 of the upper UHPC panel 1. The upper transverse through steel bar 52 passes through the transverse hole 11 of the upper UHPC panel 1 and the upper hole 511 of the upper perforated vertical steel plate 51 along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut 53 and filled with high-performance cement mortar in the hole.

[0044] The lower composite shear key 6 comprises a lower perforated vertical steel plate 61, a lower transverse through steel bar 62 and a lower nut 63. The lower perforated vertical steel plate 61 of the lower composite shear key 6 is embedded into the lower groove 222 of the UHPC layer 21B of the lower ECC / UHPC panel 1. The lower transverse through steel bar 62 passes through the transverse hole 21 of the lower panel 2 and the lower hole 611 of the lower perforated vertical steel plate 61 along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut 63 and filled with high-performance cement mortar in the hole.

[0045] The upper transverse hole 11 of the upper UHPC panel 1 and the lower transverse hole 21 of the lower panel 2 are respectively arranged at the middle position of the thickness of the UHPC layer 22 of the upper UHPC panel 1 and the lower panel 2.

[0046] A corrugated truss grid sandwich ECC / UHPC composite beam with bidirectional intersection, the implementation steps are as follows:

[0047] (1) The lower panel 2 is made according to the design requirements, and the lower composite shear key 6 is embedded into the lower groove 222 of the UHPC layer of the lower panel 2.

[0048] (2) The lower transverse through steel bar 62 passes through the lower transverse hole 21 of the lower panel 2 and the lower hole 611 of the lower perforated vertical steel plate 61 along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam with bidirectional intersection, and the two ends are tightened with the upper nut 63 and filled with high-performance cement mortar in the transverse hole 21.

[0049] (3) The upper UHPC panel 1 is made according to the design requirements, and the upper composite shear key 5 is embedded into the upper UHPC panel 1 in the upper groove 111.

[0050] (4) The upper transverse steel bars 52 are arranged along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, respectively passing through the upper transverse holes 11 of the upper UHPC panel 1 and the holes 511 of the upper perforated vertical steel plate 51, the two ends are tightened by the upper nuts 53, and the high-performance cement mortar is filled in the upper transverse holes 11, so as to form the corrugated truss grid sandwich ECC / UHPC composite beam.

[0051] The technical means disclosed in the scheme of the application is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features.

Claims

1. A bidirectional cross-corrugated truss web sandwich ECC / UHPC composite beam, characterized in that: The utility model provides a kind of ECC / UHPC composite beam, including upper UHPC panel (1), lower panel (2);Wherein upper UHPC panel (1) and lower panel (2) are arranged on and under;Upper UHPC panel (1) and lower panel (2) between respectively are provided with transverse wave-shaped truss (3) along transverse direction and longitudinal wave-shaped truss (4) along longitudinal direction Wherein transverse wave-shaped truss (3) and longitudinal wave-shaped truss (4) are arranged at 90 degrees angle and cross each other;The transverse wave-shaped truss (3) includes first top chord (38), first web member (39) and first bottom chord (30), and is connected together by welding;The longitudinal wave-shaped truss (4) includes second top chord (48), second web member (49) and second bottom chord (40), and is connected together by welding;Wherein the first top chord (38) and the second top chord (48) are connected with upper UHPC panel (1) by upper composite shear key (5);Wherein the number and position of upper composite shear key (5) are adapted to the upper groove (111) arranged on the upper UHPC panel (1);The first bottom chord (30) and the second bottom chord (40) are connected with lower panel (2) by lower composite shear key (6);Wherein the number and position of lower composite shear key (6) are adapted to the number of lower groove (222) arranged on the lower panel (2);The lower panel (2) includes ECC layer (21A) and UHPC layer (21B), and ECC layer (21A) and UHPC layer (21B) are engaged together by tooth connection (23), and thin glue layer (7) is used to increase the bonding strength between ECC layer (21A) and UHPC layer (21B).

2. A two-way cross corrugated web grid sandwich ECC / UHPC composite beam according to claim 1, characterized in that: The first top chord (38), the first web member (39), the first bottom chord (30), the second top chord (48), the second web member (49) and the second bottom chord (40) are made of round steel pipe, square steel pipe, angle steel or profiled steel.

3. The ECC / UHPC sandwich composite beam with a meandering truss grid of a two-way cross according to claim 1, characterized in that: The upper composite shear key (5) includes upper hole vertical steel plate (51), upper transverse through steel bar (52) and upper nut (53);The upper hole vertical steel plate (51) of upper composite shear key (5) is embedded into the upper groove (111) of upper UHPC panel (1);The upper transverse through steel bar (52) is respectively passed through the upper transverse hole (11) of upper UHPC panel (1) and the upper hole (511) of upper hole vertical steel plate (51) along the transverse direction of bidirectional cross wave-shaped truss grid sandwich ECC / UHPC composite beam, both ends are tightened with upper nut (53), and high-performance cement mortar is filled in the upper transverse hole (11).

4. The ECC / UHPC sandwich composite beam with a meandering truss grid of a two-way cross according to claim 1, characterized in that: The lower composite shear key (6) comprises a lower perforated vertical steel plate (61), a lower transverse penetrating steel bar (62) and a lower nut (63); the lower perforated vertical steel plate (61) of the lower composite shear key (6) is embedded into the lower groove (222) of the UHPC layer in the lower ECC / UHPC panel (2); the lower transverse penetrating steel bar (62) penetrates through the lower transverse hole (21) of the lower panel (2) and the lower hole (611) of the lower perforated vertical steel plate (61) along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the lower nut (63), and the high-performance cement mortar is filled in the lower transverse hole (21).

5. The ECC / UHPC sandwich composite beam with a meandering truss grid of a two-way cross according to claim 4, characterized in that: The lower transverse hole (21) is arranged at the middle position of the thickness of the UHPC layer (21B).

6. The method of claim 1, wherein: The method comprises the following implementation steps: (1) The lower panel (2) is manufactured according to the design requirements, and the lower composite shear key (6) is embedded into the lower groove (222) of the UHPC layer in the lower panel (2); (2) The lower transverse penetrating steel bar (62) penetrates through the lower transverse hole (21) of the lower panel (2) and the lower hole (611) of the lower perforated vertical steel plate (61) along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the lower nut (63), and the high-performance cement mortar is filled in the lower transverse hole (21); (3) The upper UHPC panel (1) is manufactured according to the design requirements, and the upper composite shear key (5) is embedded into the upper groove (111) in the upper UHPC panel (1); (4) The upper transverse penetrating steel bar (52) penetrates through the upper transverse hole (11) of the upper UHPC panel (1) and the upper hole (511) of the upper perforated vertical steel plate (51) along the transverse direction of the corrugated truss grid sandwich ECC / UHPC composite beam, and the two ends are tightened with the upper nut (53), and the high-performance cement mortar is filled in the upper transverse hole (11), thereby forming the corrugated truss grid sandwich ECC / UHPC composite beam.

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