Orthotropic steel bridge deck system structure of partition load

Abstract

The orthotropic steel bridge deck system structure comprises a bridge deck, longitudinal beams, secondary cross beams and main cross beams, the main cross beams and the secondary cross beams are arranged on the bridge deck, the secondary cross beams are arranged between the adjacent main cross beams, and the longitudinal beams are arranged on the bridge deck and penetrate through the main cross beams and the secondary cross beams. The main cross beam comprises an opening part and a closing part, and the opening part and the closing part are arranged according to the load on the bridge floor. The main cross beam is divided into the closed part and the open part, and the closed part is of a box-shaped structure, has good torsion resistance and rigidity and can bear large torque and bending moment effects; the structural form of the opening part is relatively simple, so that the processing difficulty and cost are reduced; generally, a closed part is arranged on a roadway part, and opening parts are arranged on a non-motorized vehicle lane and a sidewalk part, so that partition design of different loads is realized.

Description

Technical Field

[0001] This invention relates to the field of orthotropic steel bridge deck systems, and in particular to an orthotropic steel bridge deck system structure with zoned load. Background Technology

[0002] Orthotropic steel bridge deck systems have been widely used in long-span bridge projects due to their advantages such as light weight, high strength, and convenient construction. As an important component of orthotropic steel bridge deck systems, the crossbeams directly affect the load-bearing capacity, stiffness, and fatigue performance of the bridge deck system.

[0003] Currently, the commonly used crossbeam structures in orthotropic steel bridge deck systems are mainly of two types: open and closed. Open crossbeams are generally made of I-beams, which are simple in construction and easy to process, but have poor torsional resistance and are prone to large deformations under large torques, thus affecting the overall load-bearing performance of the bridge deck system. Closed crossbeams are usually box-shaped structures, which have good torsional resistance and stiffness; however, their processing technology is complex and costly, and stress concentration is prone to occur at the connection points with the steel top plate, longitudinal open or closed stiffening ribs in the bridge deck system, leading to an increased risk of fatigue failure.

[0004] In practical engineering applications, a single open or closed beam structure often cannot simultaneously meet the requirements of torsional resistance, processing cost, and fatigue performance.

[0005] The invention patent with publication number CN111519529B discloses a hybrid bridge deck system composed of two types of bridge decks in the transverse direction. By using a composite bridge deck or concrete slab with a larger self-weight but better fatigue resistance for heavy-duty lanes with more severe fatigue damage, and using an orthotropic steel bridge deck with a smaller self-weight but poorer fatigue resistance for fast lanes with less fatigue damage, the two are connected by a connection structure. This solves both the problem of fatigue damage in the steel bridge deck structure of conventional steel structure bridges for freight lanes and the problem of the large self-weight of the structure caused by using concrete slabs or composite bridge decks across the entire width of conventional composite structure bridges. However, this patent does not zon the load on the bridge deck.

[0006] Therefore, how to design zones according to different loads on the bridge deck is an urgent problem to be solved. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects of the prior art and provide an orthotropic steel bridge deck system with zoned load.

[0008] The objective of this invention can be achieved through the following technical solutions: According to one aspect of the present invention, an orthotropic steel bridge deck system with zoned load is provided, comprising a bridge deck, longitudinal beams, secondary crossbeams and main crossbeams, wherein the main crossbeams and secondary crossbeams are both disposed on the bridge deck, the secondary crossbeams are disposed between adjacent main crossbeams, the longitudinal beams are disposed on the bridge deck and pass through the main crossbeams and secondary crossbeams, and the main crossbeams include an open portion and a closed portion, the open portion and the closed portion being provided according to the load on the bridge deck.

[0009] As a preferred technical solution, the main crossbeam includes two webs, which are arranged parallel to each other on the bridge deck.

[0010] As a preferred technical solution, the main crossbeam further includes a lower flange plate, which is mounted on two web plates and forms a closed portion.

[0011] As a preferred technical solution, an opening is formed by drilling a hole in the lower flange plate.

[0012] As a preferred technical solution, the vertices of the opening are rounded.

[0013] As a preferred technical solution, the thickness and height of the web plate and the thickness of the lower flange plate are determined according to the load on the bridge deck.

[0014] As a preferred technical solution, the lengths of the opening and the closed portion are determined according to the load on the bridge deck.

[0015] As a preferred technical solution, the structure further includes reinforcing ribs, which are disposed on the bridge deck and are parallel to the longitudinal beams and pass through the secondary crossbeams and the main crossbeams.

[0016] As a preferred technical solution, both the longitudinal beam and the secondary crossbeam include a vertical plate and a lower base plate, with the vertical plate disposed on the bridge deck and the lower base plate disposed on the vertical plate.

[0017] As a preferred technical solution, the height of the upright plate is determined according to the load on the bridge deck, and the thickness of the bottom plate is determined according to the load on the bridge deck.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention divides the main crossbeam into a closed section and an open section. The closed section adopts a box-shaped structure, which has good torsional resistance and rigidity and can withstand large torque and bending moment. The structure of the open section is relatively simple, which reduces the processing difficulty and cost. Generally, the closed section is set in the carriageway section, and the open section is set in the non-motorized vehicle lane and sidewalk section to realize the zoning design for different loads.

[0019] 2. The open and closed portions of the present invention differ in cross-sectional stiffness and boundary constraints, and their natural frequencies and mode shapes are different. Therefore, when arranged laterally at intervals in the main beam, the resonance response can be effectively dispersed, and the overall dynamic amplification effect of the structure can be reduced.

[0020] 3. The lower flange plate, web plate and lower bottom plate of the present invention can be of different thicknesses, and the height of the vertical plate and web plate can also be of different heights, all of which can be adjusted as needed. Under the premise of ensuring strength, the self-weight of the crossbeam is reduced, which is conducive to reducing the overall load of the bridge.

[0021] 4. The present invention uses rounded corners at the four vertices of the opening, which effectively reduces stress concentration, improves the fatigue performance of the beam, and extends the service life of the bridge. Attached Figure Description

[0022] Figure 1 This is a top view of the overall structure of the present invention; Figure 2 This is a bottom view of the overall structure of the present invention; 1. Bridge deck; 2. Longitudinal beams; 3. Secondary crossbeams; 4. Opening section; 5. Closed section; 6. Web plate; 7. Reinforcing ribs; 8. Vertical plate; 9. Bottom plate. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] Example 1 like Figure 1 and Figure 2 As shown, an orthotropic steel bridge deck system with zoned load includes a bridge deck 1, longitudinal beams 2, secondary crossbeams 3, and main crossbeams. The main crossbeams and secondary crossbeams 3 are both disposed on the bridge deck 1. The secondary crossbeams 3 are disposed between adjacent main crossbeams. The longitudinal beams 2 are disposed on the bridge deck 1 and pass through the main crossbeams and secondary crossbeams 3. The main crossbeams include an opening 4 and a closed opening 5, which are configured according to the load on the bridge deck 1.

[0025] In this embodiment, two types of crossbeams and one type of longitudinal beam are provided, and the crossbeams and longitudinal beams are installed alternately to enhance the longitudinal and transverse structural strength of the bridge deck 1. The main crossbeams are spaced apart on the bridge deck 1, and the secondary crossbeams 3 are provided on the bridge deck 1, with multiple secondary crossbeams 3 spaced apart every other main crossbeam. The longitudinal beams 2 are perpendicular to the main crossbeams or secondary crossbeams 3 and are spaced apart. The main crossbeams are divided into closed sections 5 and open sections 4 along their length direction, and the closed sections 5 and open sections 4 are provided according to the load size and distribution on the bridge deck 1.

[0026] The main crossbeam includes two webs 6, which are arranged in parallel on the bridge deck 1.

[0027] The main crossbeam also includes a lower flange plate, which is mounted on two web plates 6 and forms a closed portion 5.

[0028] An opening 4 is formed by making a hole in the lower flange plate.

[0029] The vertices of the opening 4 are rounded.

[0030] The thickness and height of the web 6 and the thickness of the lower flange are determined according to the load on the bridge deck 1.

[0031] The lengths of the opening 4 and the closed portion 5 are determined according to the load on the bridge deck 1.

[0032] In this embodiment, the closed part 5 is a box-shaped structure, which is a closed cavity formed by the bridge deck 1, the lower flange plate and the web plates 6 on both sides; a rectangular hole is opened on the lower flange plate to obtain the opening part 4, and the four vertices of the rectangular hole are rounded to effectively reduce stress concentration, improve the fatigue performance of the beam, and extend the service life of the bridge.

[0033] The structure also includes a reinforcing rib 7, which is disposed on the bridge deck 1. The reinforcing rib 7 is parallel to the longitudinal beam 2 and passes through the secondary crossbeam 3 and the main crossbeam.

[0034] Both the longitudinal beam 2 and the secondary transverse beam 3 include a vertical plate 8 and a lower bottom plate 9. The vertical plate 8 is installed on the bridge deck 1, and the lower bottom plate 9 is installed on the vertical plate 8.

[0035] The height of the upright plate 8 is determined according to the load on the bridge deck 1, and the thickness of the bottom plate 9 is determined according to the load on the bridge deck 1.

[0036] In this embodiment, reinforcing ribs 7 are arranged longitudinally to further enhance the structural strength of the bridge deck 1. The reinforcing ribs 7 also pass through the secondary crossbeam 3 and the main crossbeam. The main crossbeam, the vertical plate 8, and the lower bottom plate 9 are connected in sequence to form an I-shape, further improving the overall structural strength.

[0037] The lengths of the closed section 5 and the open section 4 are determined according to the stress requirements of the bridge. Generally, the closed section 5 is set in the carriageway section, and the open section 4 is set in the non-motorized vehicle lane and pedestrian lane section.

[0038] The lower flange plate, web plate 6 and lower bottom plate 9 can be of different thicknesses, and the height of the vertical plate 8 and web plate 6 can also be different. All of these can be adjusted as needed. This reduces the self-weight of the crossbeam while ensuring strength, which helps to reduce the overall load of the bridge and ensure the rationality of the stress distribution.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A zoned load-bearing orthotropic steel bridge deck system, characterized in that, The bridge includes a bridge deck (1), longitudinal beams (2), secondary crossbeams (3) and main crossbeams. The main crossbeams and secondary crossbeams (3) are both located on the bridge deck (1). The secondary crossbeams (3) are located between adjacent main crossbeams. The longitudinal beams (2) are located on the bridge deck (1) and pass through the main crossbeams and secondary crossbeams (3). The main crossbeams include an open portion (4) and a closed portion (5). The open portion (4) and the closed portion (5) are set according to the load on the bridge deck (1).

2. The orthotropic steel bridge deck system with zoned load according to claim 1, characterized in that, The main crossbeam includes two webs (6), which are arranged in parallel on the bridge deck (1).

3. The orthotropic steel bridge deck system with zoned load according to claim 2, characterized in that, The main crossbeam also includes a lower flange plate, which is mounted on two web plates (6) and forms a closed portion (5).

4. The orthotropic steel bridge deck system with zoned load according to claim 3, characterized in that, An opening (4) is formed by making a hole in the lower flange plate.

5. The orthotropic steel bridge deck system with zoned load according to claim 4, characterized in that, The apex of the opening (4) is rounded.

6. The orthotropic steel bridge deck system with zoned load according to claim 2, characterized in that, The thickness and height of the web (6) and the thickness of the lower flange are determined according to the load on the bridge deck (1).

7. The orthotropic steel bridge deck system with zoned load according to claim 1, characterized in that, The lengths of the opening (4) and the closed portion (5) are determined according to the load on the bridge deck (1).

8. The orthotropic steel bridge deck system with zoned load according to claim 1, characterized in that, The structure also includes reinforcing ribs (7), which are arranged on the bridge deck (1). The reinforcing ribs (7) are parallel to the longitudinal beams (2) and pass through the secondary crossbeams (3) and the main crossbeams.

9. The orthotropic steel bridge deck system with zoned load according to claim 1, characterized in that, Both the longitudinal beam (2) and the secondary cross beam (3) include a vertical plate (8) and a lower bottom plate (9). The vertical plate (8) is set on the bridge deck (1), and the lower bottom plate (9) is set on the vertical plate (8).

10. The orthotropic steel bridge deck system with zoned load according to claim 9, characterized in that, The height of the upright plate (8) is determined according to the load of the bridge deck (1), and the thickness of the bottom plate (9) is determined according to the load of the bridge deck (1).

Images