Steel-wood combined arch structure and design method of bridge thereof

Abstract

This invention provides a steel-wood composite arch structure, divided into glued composite arches and bolted composite arches. The glued composite arch includes: a steel arch, the surface of which is cleaned of oil and dust using a metal cleaner and alcohol, and welding slag generated during welding is ground off using an angle grinder; plywood boards, the surface of which is cleaned of dust using sandpaper; epoxy resin adhesive, evenly applied to the bonding surfaces of the steel and wood, clamped with G-clamps, left to stand for 48 hours, and then the clamps are removed. The bolted composite arch includes: a steel arch, bolt holes drilled, the surface of which is cleaned of stains using a metal cleaner and alcohol, and welding slag is ground off using an angle grinder; plywood boards, the surface of which is cleaned of dust using sandpaper, assembled onto the steel arch, secured with G-clamps, bolt holes drilled in the plywood boards; bolts, passed through the bolt holes, tightened, and then the clamps are removed. This invention can improve the load-bearing capacity of wooden arches with the same cross-section, and has the characteristics of beautiful appearance, reasonable stress distribution, and environmental friendliness, showing great development prospects.

Description

Technical Field

[0001] This invention relates to the field of building structure technology, specifically to a steel-wood composite arch structure and its bridge design method. Background Technology

[0002] Arch structures are aesthetically pleasing and structurally sound. They effectively transfer vertical loads to the supports via axial forces, significantly reducing bending moments and facilitating large spans. Timber, however, has low compressive, tensile, and bending strengths, low stiffness, high deformation, and susceptibility to insect infestation. Introducing steel into timber arch designs enhances the arch's strength and stiffness, while the warmth and inviting feel of wood allow for unique architectural forms and expressions. Encasing steel in timber provides fire and corrosion protection for the steel, while the timber panels offer lateral support, preventing premature buckling and instability. Steel-timber composite structures align with my country's green building initiatives and offer significant advantages in earthquake resistance, energy efficiency, and prefabricated construction, demonstrating promising development prospects.

[0003] Currently, there is limited research on steel-wood composite arches. Therefore, improving the design methods for steel-wood composite arches can provide a reference for the innovation of arch structure forms. Steel-wood composite arch structures combine the advantages of both wood and steel structures, featuring beautiful shapes, reasonable stress distribution, and environmental friendliness, and have excellent development prospects. Summary of the Invention

[0004] This invention aims to propose a steel-wood composite arch structure that addresses the issues of low load-bearing capacity in wooden arches and susceptibility to local buckling in steel arches, achieving a balance of rational stress distribution, high strength and stiffness, aesthetically pleasing design, and environmental friendliness. Furthermore, it proposes various cross-sectional forms for the steel-wood composite arch structure to address the limited range of cross-sectional options available, thus enriching the structural possibilities and providing a reference for future scientific research and engineering applications.

[0005] The technical solution adopted in this application is as follows:

[0006] A steel-wood composite arch structure with all bolted connections includes: an arched H-shaped steel structure, upper flange composite wooden planks disposed on the upper flange of the arched H-shaped steel structure, lower flange composite wooden planks disposed on the lower flange of the arched H-shaped steel structure, and left and right web composite wooden planks disposed on both sides of the web of the arched H-shaped steel structure.

[0007] The first bolt is vertically inserted through the upper flange assembly board, the upper flange, the left web assembly board, the lower flange, and the lower flange assembly board for fixation; the second bolt is vertically inserted through the upper flange assembly board, the upper flange, the right web assembly board, the lower flange, and the lower flange assembly board for fixation.

[0008] A construction method for a bridge comprising the aforementioned fully bolted steel-timber composite arch structure includes the following steps:

[0009] a. Process the arched H-shaped steel structure and sleeve, the sleeve being used to connect the steel-wood composite arch structure and the hinged support; drill bolt holes on the upper and lower flanges of the arched H-shaped steel structure; after processing, clean the impurities on the surface of the H-shaped steel structure with metal cleaner and alcohol; grind the arched H-shaped steel structure with an angle grinder to remove the welding slag generated during the welding process;

[0010] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust from the surface of the wood with sandpaper, and make the upper flange composite board, lower flange composite board, left web composite board and right web composite board.

[0011] c. Assemble the lower flange composite wooden board onto the lower flange of the arched H-shaped steel structure. According to the bolt holes of the lower flange of the arched H-shaped steel structure, drill corresponding holes on the lower flange composite wooden board and remove the lower flange composite wooden board.

[0012] d. Assemble the upper flange composite wooden board onto the upper flange of the arched H-shaped steel structure. According to the bolt holes of the upper flange of the arched H-shaped steel structure, drill corresponding holes on the upper flange composite wooden board and remove the upper flange composite wooden board.

[0013] e. Assemble the left and right web composite boards onto the web of the arched H-shaped steel structure and fix them with G-clamps. Drill holes in the left and right web composite boards according to the bolt holes on the lower flange of the arched H-shaped steel structure. Assemble the upper and lower flange composite boards onto the upper and lower flanges respectively and fix them with G-clamps.

[0014] e. Secure the first bolt by vertically passing through the upper flange assembly board, the upper flange, the left web assembly board, the lower flange, and the lower flange assembly board; secure the second bolt by vertically passing through the upper flange assembly board, the upper flange, the right web assembly board, the lower flange, and the lower flange assembly board.

[0015] f. Remove the clamps, pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

[0016] A steel-wood composite arch structure connected by bolts and self-tapping screws includes: an arched H-shaped steel structure, upper flange composite wooden boards disposed on the upper flange of the arched H-shaped steel structure, lower flange composite wooden boards disposed on the lower flange of the arched H-shaped steel structure, and left and right web composite wooden boards disposed on both sides of the web of the arched H-shaped steel structure.

[0017] The third and fourth bolts pass laterally through the left web plate assembly board and the web and right web plate assembly board for fixation;

[0018] The first self-tapping screw passes vertically through the lower flange assembly board and the lower flange and is then fixed inside the left web assembly board;

[0019] The second self-tapping screw passes vertically through the lower flange assembly board and the lower flange, and is then fixed inside the right web assembly board;

[0020] The third self-tapping screw passes vertically through the upper flange assembly board and the upper flange and is then fixed inside the left web assembly board;

[0021] The fourth self-tapping screw passes vertically through the upper flange assembly board and the upper flange and is then fixed inside the right web assembly board.

[0022] A construction method for a bridge comprising a steel-timber composite arch connected by bolts and self-tapping screws, as described above, includes the following steps:

[0023] a. Process the arched H-beam steel structure and sleeves. The sleeves are used to connect the steel-wood composite arch structure and the hinged supports. Drill bolt holes on the web of the arched H-beam steel structure. After processing, clean the impurities on the surface of the arched H-beam steel structure with metal cleaner and alcohol. Grind the arched H-beam steel structure with an angle grinder to remove the welding slag generated during the welding process.

[0024] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust from the surface of the wood with sandpaper, and make the upper flange composite board, lower flange composite board, left web composite board and right web composite board.

[0025] c. Assemble the left web composite plank on the left web of the arched H-beam steel structure, and drill holes in the left web composite plank according to the bolt holes of the arched H-beam steel structure; assemble the right web composite plank on the right web of the arched H-beam steel structure, and drill holes in the right web composite plank according to the bolt holes of the H-beam steel structure; connect the arched H-beam steel structure with the left web composite plank and the right web composite plank using the third and fourth bolts;

[0026] d. Assemble the upper flange composite wooden board and the lower flange composite wooden board on the upper flange and the lower flange of the arched H-shaped steel structure respectively, fix them with G-type clips, and drive in the first self-tapping screw, the second self-tapping screw, the third self-tapping screw and the fourth self-tapping screw at certain intervals according to the design drawings;

[0027] e. Pre-assemble the sleeve and steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

[0028] An adhesive steel-wood composite arch structure includes: an arched H-shaped steel structure, adhesive, and composite wood panels. The adhesive is uniformly applied to the contact interface between the arched H-shaped steel structure and the composite wood panels, and the composite wood panels are bonded to the arched H-shaped steel structure.

[0029] A construction method for a bridge comprising the aforementioned adhesive-bonded steel-timber composite arch structure includes the following steps:

[0030] a. Process the arched H-shaped steel structure and sleeves. The sleeves are used to connect the steel-wood composite arch and the hinged support. After processing, use metal cleaner and alcohol to clean the impurities on the surface of the arched H-shaped steel structure. Use an angle grinder to grind the arched H-shaped steel structure to remove the welding slag generated during the welding process.

[0031] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust from the surface of the wood with sandpaper, and make composite wood panels;

[0032] c. Take out epoxy resin AB glue in a ratio of A:B=1:1, mix and stir evenly to prepare adhesive, and apply the adhesive evenly to the connection surface of the web of the arched H-shaped steel structure and the composite wood board; then assemble the composite wood board on the arched H-shaped steel structure, fill the areas that are not filled with adhesive, and clamp with G-type clamps to ensure that the arched H-shaped steel and the wood are firmly bonded.

[0033] d. Apply adhesive evenly to the bonding areas of the upper and lower flanges of the arched H-shaped steel structure and the composite wooden boards. Assemble the composite wooden boards onto the upper and lower flanges of the arched H-shaped steel structure. Fill any areas where the adhesive is not fully applied with glue and clamp them with G-clamps.

[0034] e. After applying the adhesive, let it stand for 48 hours, then remove the clamps; pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the steel-wood composite arch structure according to the position of the bolt holes on the sleeve to facilitate subsequent installation.

[0035] Furthermore, based on the aforementioned steel-wood composite arch structure, the ratio of the steel area of ​​the steel-wood composite arch section to the total area of ​​the arch section is defined as the steel content ratio. The bearing capacity of the steel-wood composite arch is directly proportional to the steel strength, the wood strength, and the steel content ratio of the section.

[0036] Furthermore, ordinary steel is selected for the steel used; glued laminated timber is selected for the timber used; and grade 8.8 bolts and self-tapping screws are selected.

[0037] The load-bearing capacity calculation method for steel-wood composite arch structures described above includes the following steps:

[0038] The hinged circular arch is a statically indeterminate structure of one order. Taking a simply supported curved beam as the basic system and the support thrust X1 as the basic unknown, the force method equation is:

[0039] δ 11 X1+Δ 1P =0 (1)

[0040] Where δ 11 Numerically, it equals the displacement of the basic structure along the X1 direction under the action of a unit force X1 = 1 alone, representing Δ. 1P This represents the displacement of the basic structure along the X1 direction under the action of a single load.

[0041] Since the basic structure is a simply supported curved beam, calculate Δ 1P Only bending deformation is considered; δ is calculated as follows. 11 Considering bending and axial deformation, Δ 1p and δ 11 The expression is

[0042]

[0043]

[0044] Under the action of X1=1, the bending moment and axial force of any section of the basic structure are as follows:

[0045] M1 = -y (4)

[0046]

[0047]

[0048]

[0049] Where y represents the ordinate of any cross section C, with upward being positive; R is the radius of the circular arch; and f is the rise of the circular arch. This represents the angle between the tangent to the arch axis at any cross-section C and the x-axis, which is positive on the left half of the arch and negative on the right half. It is half the central angle. Let x be the angle between the tangent to the arch axis at the loading point in the middle of the left half of the arch and the x-axis. The angle between the tangent to the arch axis at the outermost loading point on the left half of the arch and the x-axis; the bending moment M is positive so that the inner side of the arch is under tension;

[0050] If only a vertical load is applied, the bending moment M at any section of a simply supported curved beam is... P The bending moment M at the corresponding section of a simply supported horizontal beam with the same span and load. 0 They are equal to each other, that is

[0051] M P =M 0 (8)

[0052] Substitute Δ1p and δ 11 The expression can be obtained as follows:

[0053]

[0054]

[0055] Δ 1p and δ 11 After obtaining the result, the horizontal thrust X1, i.e., F, can be calculated using the force method equations. H :

[0056]

[0057] The internal force calculation method can refer to the internal force calculation formula of a three-hinged arch:

[0058] M = M 0 -F H y (12)

[0059]

[0060]

[0061] The shear force at the cross section is positive when it causes a small segment of the arch to rotate clockwise, while the axial force is positive when it is tensile; M 0 and These represent the bending moment and axial force at corresponding sections of simply supported beams with the same span and load;

[0062] Divide the simply supported horizontal beam into 6 segments, and the bending moment expression is:

[0063] hour,

[0064]

[0065] hour,

[0066]

[0067] hour,

[0068]

[0069] hour,

[0070]

[0071] hour,

[0072]

[0073] hour,

[0074]

[0075] Where P represents the load, L represents the span of the arch, and R represents the radius of the circular arch;

[0076] For the sake of convenience in representing integrals, assume...

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083] Then Δ 1p Simplified representation:

[0084]

[0085] After calculation, we can obtain

[0086]

[0087]

[0088]

[0089]

[0090] To simplify the representation of δ 11 Assuming

[0091]

[0092]

[0093] Support horizontal thrust:

[0094]

[0095] Find F H and Then, by substituting into formulas (12), (13), and (14), the internal forces of any cross section can be obtained.

[0096] Furthermore, the formula for verifying the bearing capacity of a compression-bending member is as follows:

[0097]

[0098]

[0099]

[0100] l0 = k l l (38)

[0101] In the formula:

[0102] N—Design value of axial pressure;

[0103] M x —Design bending moment (N·mm) relative to the x-axis;

[0104] A n —Net cross-sectional area of ​​the component (mm²) 2 );

[0105] W nx —Net section modulus relative to the x-axis (mm) 3 );

[0106] f c —Design value of compressive strength parallel to grain (N / mm) 2 );

[0107] f mx —Design value of bending strength of glued laminated timber members relative to the x-axis (N / mm) 2 );

[0108] E – Elastic modulus (N / mm²) 2 );

[0109] b — Component width (mm);

[0110] h — Component height (mm);

[0111] l ox —Calculate the length;

[0112] k l —Length calculation coefficient;

[0113] Calculation of bending strength of wood:

[0114]

[0115] In the formula:

[0116] f c —Design value of compressive strength parallel to grain (N / mm) 2 );

[0117] ft —Design value of tensile strength parallel to grain (N / mm) 2 );

[0118] f m —Design value of flexural strength parallel to grain (N / mm) 2 );

[0119] Referring to the calculation method of bearing capacity of steel-concrete composite columns, the "simulated wood theory" is proposed. First, the cross-sectional area of ​​the arch is obtained by the relationship between the compressive strength of steel and wood, as shown in formula (40). Next, the design value of the compressive strength of wood is obtained by the principle that the compressive strength of the arch cross section remains unchanged, as shown in formula (41). Then, the elastic modulus is obtained by the principle that the overall compressive stiffness of the arch cross section remains unchanged, as shown in formula (42). Finally, the bearing capacity of the steel-wood composite arch is obtained by the formula for verifying the bearing capacity of the compression-bending member.

[0120]

[0121] A'f c =Af' c (41)

[0122] E'A = E c A c +E s A s (42)

[0123] In the formula:

[0124] A'——Converted arch cross-sectional area (mm²) 2 );

[0125] A c —Arch cross-section timber area (mm²) 2 );

[0126] A s —Area of ​​steel in the arch section (mm²) 2 );

[0127] f s —Design value of compressive strength of steel (N / mm) 2 );

[0128] f c —Design value of compressive strength of wood (N / mm) 2 );

[0129] A—Original area of ​​the arch cross-section (mm²) 2 );

[0130] f' c —Converted design value of wood compressive strength (N / mm) 2 );

[0131] E' — Converted wood elastic modulus (N / mm²) 2 );

[0132] E c — Modulus of elasticity of timber in arch section (N / mm) 2 );

[0133] E s — Modulus of elasticity of arch section steel (N / mm) 2 ).

[0134] Compared with existing technologies, the steel-wood composite arch structure of the present invention has at least the following advantages:

[0135] 1. The steel inside the composite arch has high strength and toughness, which can improve the mechanical properties of the wooden components.

[0136] 2. Wrapping steel with wood is beneficial for the steel's fire resistance and corrosion prevention. The outer wood provides lateral support to the steel plate, preventing the steel from buckling prematurely. Therefore, compared to wooden arches, steel-wood composite arches have a certain degree of improved rigidity and load-bearing capacity.

[0137] 3. Wood has a friendly and warm feel, and steel-wood composite arch structures can produce unique architectural shapes and expressions.

[0138] 4. Steel-wood composite arch structure conforms to the concept of green building advocated by my country, which can alleviate the carbon reduction pressure of the construction industry, and has great advantages in earthquake resistance, energy saving and prefabricated building.

[0139] 5. Epoxy resin adhesive, bolts, and self-tapping screws can effectively bind steel and wood, enhancing the synergistic performance of steel arches and wooden planks. Attached Figure Description

[0140] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0141] Figure 1 This is a schematic diagram of the basic structure of an embodiment of this application; wherein, (a) a two-hinge circular arc arch; (b) the basic structure; (c) the basic structure under the action of X1=1; (d) Schematic diagram;

[0142] Figure 2This is a schematic diagram of the sleeve structure according to an embodiment of this application; wherein, (a) is a front view of the sleeve; (b) is a left view of the sleeve; (c) is a plan view of the sleeve; (d) is a model diagram of the sleeve; and (e) is a model diagram of the sleeve and the support.

[0143] Figure 3 This is a front view of a steel-wood composite arch according to an embodiment of this application;

[0144] Figure 4-5 This is a 1-1 cross-sectional view of a bolted steel-wood composite arch according to an embodiment of this application;

[0145] Figure 6 This is a 1-1 cross-sectional view of the glued steel-wood composite arch according to an embodiment of this application;

[0146] Figure 7-9 This is a schematic diagram of the cross-sectional shape of the steel-wood composite arch according to an embodiment of this application. Detailed Implementation

[0147] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0148] See Figure 1-9 The present application discloses a steel-wood composite arch structure with all bolted connection, comprising: an arched H-shaped steel structure (5), an upper flange composite wooden board (1) disposed on the upper flange of the arched H-shaped steel structure (5), a lower flange composite wooden board (2) disposed on the lower flange of the arched H-shaped steel structure (5), and a left web composite wooden board (3) and a right web composite wooden board (4) disposed on both sides of the web of the arched H-shaped steel structure (5);

[0149] The first bolt (6) is vertically inserted through the upper flange combined wooden board (1), the upper flange and left web combined wooden board (3), and the lower flange and lower flange combined wooden board (2) for fixation; the second bolt (7) is vertically inserted through the upper flange combined wooden board (1), the upper flange and right web combined wooden board (4), and the lower flange and lower flange combined wooden board (2) for fixation.

[0150] A construction method for a bridge comprising a steel-timber composite arch structure with all bolted connections, as described above, includes the following steps:

[0151] a. Process the arched H-shaped steel structure (5) and the sleeve, the sleeve being used to connect the steel-wood composite arch structure and the hinged support; drill bolt holes on the upper and lower flanges of the arched H-shaped steel structure (5); after processing, clean the impurities on the surface of the H-shaped steel structure (5) with metal cleaner and alcohol; grind the arched H-shaped steel structure (5) with an angle grinder to remove the welding slag generated during the welding process;

[0152] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust on the surface of the wood with sandpaper, and make the upper flange composite board (1), lower flange composite board (2), left web composite board (3) and right web composite board (4).

[0153] c. Assemble the lower flange composite wooden board (2) onto the lower flange of the arched H-shaped steel structure (5). According to the bolt holes of the lower flange of the arched H-shaped steel structure (5), drill corresponding holes on the lower flange composite wooden board (2) and remove the lower flange composite wooden board (2).

[0154] d. Assemble the upper flange composite wooden board (1) onto the upper flange of the arched H-shaped steel structure (5). According to the bolt holes of the upper flange of the arched H-shaped steel structure (5), drill corresponding holes on the upper flange composite wooden board (1) and remove the upper flange composite wooden board (1).

[0155] e. Assemble the left web plate composite board (3) and the right web plate composite board (4) onto the web of the arched H-shaped steel structure (5) and fix them with G-clamps. Drill holes in the left web plate composite board (3) and the right web plate composite board (4) according to the bolt holes of the lower flange of the arched H-shaped steel structure (5). Assemble the upper flange composite board (1) and the lower flange composite board (2) onto the upper flange and the lower flange respectively and fix them with G-clamps.

[0156] e. Fix the first bolt (6) vertically through the upper flange combined wooden board (1), the upper flange and left web combined wooden board (3), the lower flange and lower flange combined wooden board (2); fix the second bolt (7) vertically through the upper flange combined wooden board (1), the upper flange and right web combined wooden board (4), the lower flange and lower flange combined wooden board (2);

[0157] f. Remove the clamps, pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

[0158] In an embodiment of this application, a steel-wood composite arch structure connected by bolts and self-tapping screws includes: an arched H-shaped steel structure (12), an upper flange composite wooden board (8) disposed on the upper flange of the arched H-shaped steel structure (12), a lower flange composite wooden board (9) disposed on the lower flange of the arched H-shaped steel structure (12), and a left web composite wooden board (10) and a right web composite wooden board (11) disposed on both sides of the web of the arched H-shaped steel structure (12);

[0159] The third bolt (13) and the fourth bolt (14) are fixed by passing through the left web plate composite board (10) and the web plate and right web plate composite board (11) laterally;

[0160] The first self-tapping screw (15) passes vertically through the lower flange assembly board (9) and the lower flange and is then fixed inside the left web assembly board (10);

[0161] The second self-tapping screw (16) passes vertically through the lower flange assembly board (9) and the lower flange and is then fixed inside the right web assembly board (11);

[0162] The third self-tapping screw (17) passes vertically through the upper flange assembly board (8) and the upper flange and is then fixed inside the left web assembly board (10);

[0163] The fourth self-tapping screw (18) passes vertically through the upper flange assembly board (8) and the upper flange and is then fixed inside the right web assembly board (11).

[0164] A construction method for a bridge comprising a steel-timber composite arch connected by bolts and self-tapping screws, as described above, includes the following steps:

[0165] a. Process the arched H-shaped steel structure (12) and the sleeve, which is used to connect the steel-wood composite arch structure and the hinged support; drill bolt holes on the web of the arched H-shaped steel structure (12); after processing, clean the impurities on the surface of the arched H-shaped steel structure (12) with metal cleaner and alcohol; grind the arched H-shaped steel structure (12) with an angle grinder to remove the welding slag generated during the welding process;

[0166] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust on the surface of the wood with sandpaper, and make the upper flange composite board (8), lower flange composite board (9), left web composite board (10) and right web composite board (11).

[0167] c. Assemble a left web composite board (10) on the left web of the arched H-shaped steel structure (12), and drill holes in the left web composite board (10) according to the bolt holes of the arched H-shaped steel structure (12); Assemble a right web composite board (11) on the right web of the arched H-shaped steel structure (12), and drill holes in the right web composite board (11) according to the bolt holes of the H-shaped steel structure (12); Connect the arched H-shaped steel structure (12) with the left web composite board (10) and the right web composite board (11) using the third bolt (13) and the fourth bolt (14);

[0168] d. Assemble the upper flange composite wooden board (8) and the lower flange composite wooden board (9) on the upper flange and the lower flange of the arched H-shaped steel structure (12) respectively, fix them with G-type clips, and drive in the first self-tapping screw (15), the second self-tapping screw (16), the third self-tapping screw (17) and the fourth self-tapping screw (18) at certain intervals according to the design drawings.

[0169] e. Pre-assemble the sleeve and steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

[0170] In an embodiment of this application, an adhesive steel-wood composite arch structure includes: an arched H-shaped steel structure (23), adhesive, and composite wood boards (19, 20, 21, 22). The adhesive is uniformly applied to the contact interface between the arched H-shaped steel structure (23) and the composite wood boards (19, 20, 21, 22), and the composite wood boards (19, 20, 21, 22) are bonded to the arched H-shaped steel structure (23).

[0171] A construction method for a bridge comprising the aforementioned adhesive-bonded steel-timber composite arch structure includes the following steps:

[0172] a. Process the arched H-shaped steel structure (23) and sleeve. The sleeve is used to connect the steel-wood composite arch and the hinged support. After processing, use metal cleaner and alcohol to clean the impurities on the surface of the arched H-shaped steel structure (23). Use an angle grinder to grind the arched H-shaped steel structure (23) to remove the welding slag generated during the welding process.

[0173] b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust from the surface of the wood with sandpaper, and make composite wood boards (19, 20, 21, 22).

[0174] c. Take out epoxy resin AB glue in a ratio of A:B = 1:1, mix and stir evenly to prepare adhesive, and apply the adhesive evenly to the connecting surface of the web of the arched H-shaped steel structure (23) and the composite wood boards (19, 20, 21, 22); then assemble the composite wood boards (19, 20, 21, 22) on the arched H-shaped steel structure (23), fill the areas that are not filled with adhesive, and clamp them with G-type clamps to ensure that the arched H-shaped steel and the wood are tightly bonded;

[0175] d. Apply adhesive evenly to the bonding areas of the upper and lower flanges of the arched H-shaped steel structure (23) and the composite wooden boards (19, 20, 21, 22), assemble the composite wooden boards (19, 20, 21, 22) on the upper and lower flanges of the arched H-shaped steel structure (23), fill in the areas where the adhesive is not fully filled, and clamp with G-type clamps;

[0176] e. After applying the adhesive, let it stand for 48 hours, then remove the clamps; pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the steel-wood composite arch structure according to the position of the bolt holes on the sleeve to facilitate subsequent installation.

[0177] In the embodiments of this application, the ratio of the steel area of ​​the steel-wood composite arch section to the total area of ​​the arch section is defined as the steel content ratio. The bearing capacity of the steel-wood composite arch is proportional to the steel strength, the wood strength and the steel content ratio of the section.

[0178] In the embodiments of this application, ordinary steel is selected; glued laminated timber is selected; and grade 8.8 bolts and self-tapping screws are selected.

[0179] In the embodiments of this application, the method for calculating the load-bearing capacity of the steel-wood composite arch structure described above is characterized by including the following steps:

[0180] The hinged circular arch is a statically indeterminate structure of one order. Taking a simply supported curved beam as the basic system and the support thrust X1 as the basic unknown, the force method equation is:

[0181] δ 11 X1+Δ 1P =0 (1)

[0182] Where δ 11 Numerically, it equals the displacement of the basic structure along the X1 direction under the action of a unit force X1 = 1 alone, representing Δ. 1P This represents the displacement of the basic structure along the X1 direction under the action of a single load.

[0183] Since the basic structure is a simply supported curved beam, calculate Δ 1P Only bending deformation is considered; δ is calculated as follows. 11 Considering bending and axial deformation, Δ 1pand δ 11 The expression is

[0184]

[0185]

[0186] Under the action of X1=1, the bending moment and axial force of any section of the basic structure are as follows:

[0187] M1 = -y (4)

[0188]

[0189]

[0190]

[0191] Where y represents the ordinate of any cross section C, with upward being positive; R is the radius of the circular arch; and f is the rise of the circular arch. This represents the angle between the tangent to the arch axis at any cross-section C and the x-axis, which is positive on the left half of the arch and negative on the right half. It is half the central angle. Let x be the angle between the tangent to the arch axis at the loading point in the middle of the left half of the arch and the x-axis. The angle between the tangent to the arch axis at the outermost loading point on the left half of the arch and the x-axis; the bending moment M is positive so that the inner side of the arch is under tension;

[0192] If only a vertical load is applied, the bending moment M at any section of a simply supported curved beam is... P The bending moment M at the corresponding section of a simply supported horizontal beam with the same span and load. 0 They are equal to each other, that is

[0193] M P =M 0 (8)

[0194] Substitute Δ 1p and δ 11 The expression can be obtained as follows:

[0195]

[0196]

[0197] Δ 1p and δ 11 After obtaining the result, the horizontal thrust X1, i.e., F, can be calculated using the force method equations. H :

[0198]

[0199] The internal force calculation method can refer to the internal force calculation formula of a three-hinged arch:

[0200] M = M 0 -F H y (12)

[0201]

[0202]

[0203] The shear force at the cross section is positive when it causes a small segment of the arch to rotate clockwise, while the axial force is positive when it is tensile; M 0 and These represent the bending moment and axial force at corresponding sections of simply supported beams with the same span and load;

[0204] Divide the simply supported horizontal beam into 6 segments, and the bending moment expression is:

[0205] hour,

[0206]

[0207] hour,

[0208]

[0209] hour,

[0210]

[0211] hour,

[0212]

[0213] hour,

[0214]

[0215] hour,

[0216]

[0217] Where P represents the load, L represents the span of the arch, and R represents the radius of the circular arch;

[0218] For the sake of convenience in representing integrals, assume...

[0219]

[0220]

[0221]

[0222]

[0223]

[0224]

[0225] Then Δ 1p Simplified representation:

[0226]

[0227] After calculation, we can obtain

[0228]

[0229]

[0230]

[0231]

[0232] To simplify the representation of δ 11 Assuming

[0233]

[0234]

[0235] Support horizontal thrust:

[0236]

[0237] Find F H and Then, by substituting into formulas (12), (13), and (14), the internal forces of any cross section can be obtained.

[0238] Furthermore, the formula for verifying the bearing capacity of a compression-bending member is as follows:

[0239]

[0240]

[0241]

[0242] l0 = k l l (38)

[0243] In the formula:

[0244] N—Design value of axial pressure;

[0245] M x —Design bending moment (N·mm) relative to the x-axis;

[0246] A n —Net cross-sectional area of ​​the component (mm²) 2 );

[0247] W nx —Net section modulus relative to the x-axis (mm) 3 );

[0248] f c —Design value of compressive strength parallel to grain (N / mm) 2 );

[0249] f mx —Design value of bending strength of glued laminated timber members relative to the x-axis (N / mm) 2 );

[0250] E – Elastic modulus (N / mm²) 2 );

[0251] b — Component width (mm);

[0252] h — Component height (mm);

[0253] l ox —Calculate the length;

[0254] k l —Length calculation coefficient;

[0255] Calculation of bending strength of wood:

[0256]

[0257] In the formula:

[0258] f c —Design value of compressive strength parallel to grain (N / mm) 2 );

[0259] f t —Design value of tensile strength parallel to grain (N / mm) 2 );

[0260] f m —Design value of flexural strength parallel to grain (N / mm) 2 );

[0261] Referring to the calculation method of bearing capacity of steel-concrete composite columns, the "simulated wood theory" is proposed. First, the cross-sectional area of ​​the arch is obtained by the relationship between the compressive strength of steel and wood, as shown in formula (40). Next, the design value of the compressive strength of wood is obtained by the principle that the compressive strength of the arch cross section remains unchanged, as shown in formula (41). Then, the elastic modulus is obtained by the principle that the overall compressive stiffness of the arch cross section remains unchanged, as shown in formula (42). Finally, the bearing capacity of the steel-wood composite arch is obtained by the formula for verifying the bearing capacity of the compression-bending member.

[0262]

[0263] A'f c =Af' c (41)

[0264] E'A = E c A c +E s A s (42)

[0265] In the formula:

[0266] A'——Converted arch cross-sectional area (mm²) 2 );

[0267] A c —Arch cross-section timber area (mm²) 2 );

[0268] A s —Area of ​​steel in the arch section (mm²) 2 );

[0269] f s —Design value of compressive strength of steel (N / mm) 2 );

[0270] f c —Design value of compressive strength of wood (N / mm) 2 );

[0271] A—Original area of ​​the arch cross-section (mm²) 2 );

[0272] f' c —Converted design value of wood compressive strength (N / mm) 2 );

[0273] E' — Converted wood elastic modulus (N / mm²) 2 );

[0274] E c — Modulus of elasticity of timber in arch section (N / mm) 2 );

[0275] E s — Modulus of elasticity of arch section steel (N / mm) 2 ).

[0276] The following are embodiments of this application:

[0277] (1) Bolted steel-wood composite arch structure

[0278] Taking the arched steel structure as an example, which uses H-beams, please refer to [link / reference]. Figures 4-5 A steel-wood composite arch structure connected by bolts includes an arched H-shaped steel structure, a wooden board attached to the upper flange of the H-shaped steel structure, a wooden board attached to the lower flange of the H-shaped steel structure, two wooden boards attached to the web of the H-shaped steel structure, and bolts or self-tapping screws.

[0279] The fabrication method of a fully bolted steel-wood composite arch is as follows: First, process the curved H-shaped steel structure 5 according to the design requirements and drill bolt holes on the flanges of the H-shaped steel structure; then, assemble the wooden planks 1 on the upper flange of the H-shaped steel structure, fix them with clamps, and drill holes in the wooden planks 1; next, assemble the wooden planks 2, 3, and 4 on the lower flange and web of the H-shaped steel structure respectively, fix them with clamps, and drill holes in the wooden planks 2, 3, and 4 assembled on the lower flange and web according to the bolt hole positions of the wooden planks 1 assembled on the upper flange of the H-shaped steel structure; finally, connect them with bolts 6 and 7 and remove the clamps.

[0280] The method for constructing a steel-wood composite arch connected by bolts and self-tapping screws is as follows: First, process the curved H-shaped steel structure 12 according to the design requirements and drill bolt holes on the web of the H-shaped steel structure; then, assemble wooden boards 10 on the web of the H-shaped steel structure, fix them with clamps, drill holes in the wooden boards 10, then assemble wooden boards 11 on the web of the H-shaped steel structure, fix them with clamps, drill holes in the wooden boards 11, insert bolts 13 and 14, and tighten them; next, assemble wooden boards 8 and 9 on the upper and lower flanges of the H-shaped steel structure respectively, fix them with clamps, drive in self-tapping screws 15, 16, 17, and 18, and remove the clamps.

[0281] (2) Adhesive-bonded steel-wood composite arch structure

[0282] Taking the arched steel structure as an example, which uses H-beams, please refer to [link / reference]. Figure 6 An adhesive steel-wood composite arch structure includes an arched H-shaped steel structure, a wooden board attached to the upper flange of the H-shaped steel structure, a wooden board attached to the lower flange of the H-shaped steel structure, two wooden boards attached to the web of the H-shaped steel structure, and epoxy resin adhesive.

[0283] Method for fabricating a glued steel-wood composite arch: First, process a curved H-shaped steel structure 23 according to the design requirements; then, apply glue evenly to the contact interface between the H-shaped steel structure and the wood; next, combine wooden boards 19, 20, 21, and 22 on the flanges and web of the H-shaped steel structure respectively, fix them with clamps, and fill any gaps with glue; let it stand for 48 hours, then remove the clamps.

[0284] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-wood composite arch structure with all bolted connections, characterized in that, include: Arched H-shaped steel structure (5), upper flange composite wooden board (1) set on the upper flange of the arched H-shaped steel structure (5), lower flange composite wooden board (2) set on the lower flange of the arched H-shaped steel structure (5), left web composite wooden board (3) and right web composite wooden board (4) set on both sides of the web of the arched H-shaped steel structure (5); The first bolt (6) is vertically inserted through the upper flange combined wooden board (1), the upper flange and left web combined wooden board (3), the lower flange and lower flange combined wooden board (2) for fixation; the second bolt (7) is vertically inserted through the upper flange combined wooden board (1), the upper flange and right web combined wooden board (4), the lower flange and lower flange combined wooden board (2) for fixation; The method for calculating the load-bearing capacity of the steel-wood composite arch structure includes the following steps: The hinged circular arch is a statically indeterminate structure of one order. A simply supported curved beam is selected as the basic system, with support thrust as the basis. If the fundamental unknowns are given, then the force method equation is: (1) in Numerically equal to the basic structure under unit force acting alone at the lower edge Displacement caused by direction Indicates the basic structure along the load under individual action. Displacement generated by direction; Because the basic structure is a simply supported curved beam, the calculation... Only bending deformation is considered in the calculation; Considering bending and axial deformation, and The expression is Basic structure in Under the action, the bending moment and axial force at any cross section are: (4) （5） （6） （7） in, Represents any cross section The vertical axis is positive when it points upwards; The radius of the circular arch; The rise of the circular arch; Represents any cross section Tangent to the arch axis and The angle between the axes is positive on the left half of the arch and negative on the right half. It is half the central angle. The tangent to the arch axis at the loading point in the middle of the left half of the arch and The included angle of the axis, The tangent to the arch axis at the outermost loading point on the left half of the arch and... Angle between axes; bending moment So that the inner side of the arch is under positive tension; If only a vertical load is applied, the bending moment at any section of a simply supported curved beam is... Bending moment of the corresponding section of a simply supported horizontal beam with the same span and load. They are equal to each other, that is （8） Substitution and The expression can be obtained as follows: （9） （10） and After obtaining the result, the horizontal thrust can be calculated using the force method equations. ,Right now : （11） The internal force calculation method can refer to the internal force calculation formula of a three-hinged arch: The shear force at the cross section is positive when it causes a small section of the arch to rotate clockwise, while the axial force is positive when it is tensile. and These represent the bending moment and axial force at corresponding sections of simply supported beams with the same span and load; Divide the simply supported horizontal beam into 6 segments, and the bending moment expression is: hour, hour, hour, hour, hour, hour, Where P represents the load, L represents the span of the arch, and R represents the radius of the circular arch; For the sake of convenience in representing integrals, assume... but Simplified representation: After calculation, we can obtain To simplify the representation Assuming Support horizontal thrust: Find and Then, by substituting into formulas (12), (13), and (14), the internal forces of any cross section can be obtained.

2. A construction method for a bridge comprising a fully bolted steel-timber composite arch structure as described in claim 1, characterized in that, Includes the following steps: a. Process the arched H-shaped steel structure (5) and the sleeve, the sleeve being used to connect the steel-wood composite arch structure and the hinged support; drill bolt holes on the upper and lower flanges of the arched H-shaped steel structure (5); after processing, clean the impurities on the surface of the H-shaped steel structure (5) with metal cleaner and alcohol; grind the arched H-shaped steel structure (5) with an angle grinder to remove the welding slag generated during the welding process; b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust on the surface of the wood with sandpaper, and make the upper flange composite board (1), lower flange composite board (2), left web composite board (3) and right web composite board (4). c. Assemble the lower flange composite wooden board (2) onto the lower flange of the arched H-shaped steel structure (5). According to the bolt holes of the lower flange of the arched H-shaped steel structure (5), drill corresponding holes on the lower flange composite wooden board (2) and remove the lower flange composite wooden board (2). d. Assemble the upper flange composite wooden board (1) onto the upper flange of the arched H-shaped steel structure (5). According to the bolt holes of the upper flange of the arched H-shaped steel structure (5), drill corresponding holes on the upper flange composite wooden board (1) and remove the upper flange composite wooden board (1). e. Assemble the left web plate composite board (3) and the right web plate composite board (4) onto the web of the arched H-shaped steel structure (5) and fix them with G-clamps. Drill holes in the left web plate composite board (3) and the right web plate composite board (4) according to the bolt holes of the lower flange of the arched H-shaped steel structure (5). Assemble the upper flange composite board (1) and the lower flange composite board (2) onto the upper flange and the lower flange respectively and fix them with G-clamps. f. Fix the first bolt (6) vertically through the upper flange assembly board (1), the upper flange and left web assembly board (3), the lower flange and lower flange assembly board (2); fix the second bolt (7) vertically through the upper flange assembly board (1), the upper flange and right web assembly board (4), the lower flange and lower flange assembly board (2); g. Remove the clamps, pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

3. A steel-wood composite arch structure connected by bolts and self-tapping screws, characterized in that, include: Arched H-shaped steel structure (12), upper flange composite wooden board (8) set on the upper flange of the arched H-shaped steel structure (12), lower flange composite wooden board (9) set on the lower flange of the arched H-shaped steel structure (12), left web composite wooden board (10) and right web composite wooden board (11) set on both sides of the web of the arched H-shaped steel structure (12); The third bolt (13) and the fourth bolt (14) are fixed by passing through the left web plate composite board (10) and the web plate and right web plate composite board (11) laterally; The first self-tapping screw (15) passes vertically through the lower flange assembly board (9) and the lower flange and is then fixed inside the left web assembly board (10); The second self-tapping screw (16) passes vertically through the lower flange assembly board (9) and the lower flange and is then fixed inside the right web assembly board (11); The third self-tapping screw (17) passes vertically through the upper flange assembly board (8) and the upper flange and is then fixed inside the left web assembly board (10); The fourth self-tapping screw (18) passes vertically through the upper flange assembly board (8) and the upper flange and is then fixed inside the right web assembly board (11); The method for calculating the load-bearing capacity of the steel-wood composite arch structure includes the following steps: The hinged circular arch is a statically indeterminate structure of one order. A simply supported curved beam is selected as the basic system, with support thrust as the basis. If the fundamental unknowns are given, then the force method equation is: (1) in Numerically equal to the basic structure under unit force acting alone at the lower edge Displacement caused by direction Indicates the basic structure along the load under individual action. Displacement generated by direction; Because the basic structure is a simply supported curved beam, the calculation... Only bending deformation is considered in the calculation; Considering bending and axial deformation, and The expression is Basic structure in Under the action, the bending moment and axial force at any cross section are: (4) （5） （6） （7） in, Represents any cross section The vertical axis is positive when it points upwards; The radius of the circular arch; The rise of the circular arch; Represents any cross section Tangent to the arch axis and The angle between the axes is positive on the left half of the arch and negative on the right half. It is half the central angle. The tangent to the arch axis at the loading point in the middle of the left half of the arch and The included angle of the axis, The tangent to the arch axis at the outermost loading point on the left half of the arch and... Angle between axes; bending moment So that the inner side of the arch is under positive tension; If only a vertical load is applied, the bending moment at any section of a simply supported curved beam is... Bending moment of the corresponding section of a simply supported horizontal beam with the same span and load. They are equal to each other, that is （8） Substitution and The expression can be obtained as follows: （9） （10） and After obtaining the result, the horizontal thrust can be calculated using the force method equations. ,Right now : （11） The internal force calculation method can refer to the internal force calculation formula of a three-hinged arch: The shear force at the cross section is positive when it causes a small section of the arch to rotate clockwise, while the axial force is positive when it is tensile. and These represent the bending moment and axial force at corresponding sections of simply supported beams with the same span and load; Divide the simply supported horizontal beam into 6 segments, and the bending moment expression is: hour, hour, hour, hour, hour, hour, Where P represents the load, L represents the span of the arch, and R represents the radius of the circular arch; For the sake of convenience in representing integrals, assume... but Simplified representation: After calculation, we can obtain To simplify the representation Assuming Support horizontal thrust: Find and Then, by substituting into formulas (12), (13), and (14), the internal forces of any cross section can be obtained.

4. A construction method for a bridge comprising a steel-timber composite arch connected by bolts and self-tapping screws as described in claim 3, characterized in that, Includes the following steps: a. Process the arched H-shaped steel structure (12) and the sleeve, which is used to connect the steel-wood composite arch structure and the hinged support; drill bolt holes on the web of the arched H-shaped steel structure (12); after processing, clean the impurities on the surface of the arched H-shaped steel structure (12) with metal cleaner and alcohol; grind the arched H-shaped steel structure (12) with an angle grinder to remove the welding slag generated during the welding process; b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust on the surface of the wood with sandpaper, and make the upper flange composite board (8), lower flange composite board (9), left web composite board (10) and right web composite board (11). c. Assemble a left web composite board (10) on the left web of the arched H-shaped steel structure (12), and drill holes in the left web composite board (10) according to the bolt holes of the arched H-shaped steel structure (12); Assemble a right web composite board (11) on the right web of the arched H-shaped steel structure (12), and drill holes in the right web composite board (11) according to the bolt holes of the H-shaped steel structure (12); Connect the arched H-shaped steel structure (12) with the left web composite board (10) and the right web composite board (11) using the third bolt (13) and the fourth bolt (14); d. Assemble the upper flange assembly board (8) and the lower flange assembly board (9) on the upper flange and lower flange of the arched H-shaped steel structure (12) respectively, fix them with G-type clips, and drive in the first self-tapping screw (15), the second self-tapping screw (16), the third self-tapping screw (17) and the fourth self-tapping screw (18) at certain intervals according to the design drawings. e. Pre-assemble the sleeve and steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the end area of ​​the steel-wood composite arch structure according to the position of the bolt holes on the sleeve.

5. A glued steel-wood composite arch structure, characterized in that, include: An arched H-shaped steel structure (23), adhesive and composite wood panels (19, 20, 21, 22), wherein the adhesive is uniformly applied to the contact interface between the arched H-shaped steel structure (23) and the composite wood panels (19, 20, 21, 22), and the composite wood panels (19, 20, 21, 22) are bonded to the arched H-shaped steel structure (23); The method for calculating the load-bearing capacity of the steel-wood composite arch structure includes the following steps: The hinged circular arch is a statically indeterminate structure of one order. A simply supported curved beam is selected as the basic system, with support thrust as the basis. If the fundamental unknowns are given, then the force method equation is: (1) in Numerically equal to the basic structure under unit force acting alone at the lower edge Displacement caused by direction Indicates the basic structure along the load under individual action. Displacement generated by direction; Because the basic structure is a simply supported curved beam, the calculation... Only bending deformation is considered in the calculation; Considering bending and axial deformation, and The expression is Basic structure in Under the action, the bending moment and axial force at any cross section are: (4) （5） （6） （7） in, Represents any cross section The vertical axis is positive when it points upwards; The radius of the circular arch; The rise of the circular arch; Represents any cross section Tangent to the arch axis and The angle between the axes is positive on the left half of the arch and negative on the right half. It is half the central angle. The tangent to the arch axis at the loading point in the middle of the left half of the arch and The included angle of the axis, The tangent to the arch axis at the outermost loading point on the left half of the arch and... Angle between axes; bending moment So that the inner side of the arch is under positive tension; If only a vertical load is applied, the bending moment at any section of a simply supported curved beam is... Bending moment of the corresponding section of a simply supported horizontal beam with the same span and load. They are equal to each other, that is （8） Substitution and The expression can be obtained as follows: （9） （10） and After obtaining the result, the horizontal thrust can be calculated using the force method equations. ,Right now : （11） The internal force calculation method can refer to the internal force calculation formula of a three-hinged arch: The shear force at the cross section is positive when it causes a small section of the arch to rotate clockwise, while the axial force is positive when it is tensile. and These represent the bending moment and axial force at corresponding sections of simply supported beams with the same span and load; Divide the simply supported horizontal beam into 6 segments, and the bending moment expression is: hour, hour, hour, hour, hour, hour, Where P represents the load, L represents the span of the arch, and R represents the radius of the circular arch; For the sake of convenience in representing integrals, assume... but Simplified representation: After calculation, we can obtain To simplify the representation Assuming Support horizontal thrust: Find and Then, by substituting into formulas (12), (13), and (14), the internal forces of any cross section can be obtained.

6. A construction method for a bridge comprising the adhesive-bonded steel-timber composite arch structure as described in claim 5, characterized in that, Includes the following steps: a. Process the arched H-shaped steel structure (23) and sleeve. The sleeve is used to connect the steel-wood composite arch and the hinged support. After processing, use metal cleaner and alcohol to clean the impurities on the surface of the arched H-shaped steel structure (23). Use an angle grinder to grind the arched H-shaped steel structure (23) to remove the welding slag generated during the welding process. b. Select wood with suitable moisture content and strength, cut the wood according to the design drawings, remove the dust from the surface of the wood with sandpaper, and make composite wood boards (19, 20, 21, 22). c. Take out epoxy resin AB glue in a ratio of A:B = 1:1, mix and stir evenly to make adhesive, and apply the adhesive evenly to the connecting surface of the web of the arched H-shaped steel structure (23) and the composite wooden board (19, 20, 21, 22); then assemble the composite wooden board (19, 20, 21, 22) on the arched H-shaped steel structure (23), fill the areas that are not filled with adhesive, and clamp them with G-type clamps to ensure that the arched H-shaped steel and the wood are tightly bonded; d. Apply adhesive evenly to the bonding areas of the upper and lower flanges of the arched H-shaped steel structure (23) and the composite wooden boards (19, 20, 21, 22), assemble the composite wooden boards (19, 20, 21, 22) on the upper and lower flanges of the arched H-shaped steel structure (23), fill in the areas where the adhesive is not fully filled, and clamp with G-type clamps; e. After applying the adhesive, let it stand for 48 hours, then remove the clamps; pre-assemble the sleeve and the steel-wood composite arch structure, grind the ends of the steel-wood composite arch structure according to the actual processing dimensions of the sleeve, and drill holes in the steel-wood composite arch structure according to the position of the bolt holes on the sleeve to facilitate subsequent installation.

7. The steel-wood composite arch structure according to claim 1, 3, or 5, characterized in that: The steel content ratio is defined as the ratio of the steel area to the total area of ​​the arch cross section in a steel-wood composite arch. The load-bearing capacity of a steel-wood composite arch is directly proportional to the strength of the steel, the strength of the wood, and the steel content ratio of the cross section.

8. The steel-wood composite arch structure according to claim 1, 3, or 5, characterized in that: Ordinary steel is used for steel; glued laminated timber is used for timber; and grade 8.8 bolts and self-tapping screws are used.

9. The method for calculating the bearing capacity of a steel-wood composite arch structure according to claim 8, characterized in that, Formula for verifying the bearing capacity of a compression-bending member: In the formula: —Design value for axial pressure; —Design bending moment (N•mm) relative to the x-axis; —Net cross-sectional area of ​​the component (mm²) 2 ); —Net section modulus relative to the x-axis (mm) 3 ); —Design value of compressive strength parallel to grain (N / mm) 2 ); —Design value of bending strength of glued laminated timber members relative to the x-axis (N / mm) 2 ); — Elastic modulus (N / mm) 2 ); —Component width (mm); —Component height (mm); —Calculate the length; —Length calculation coefficient; Calculation of bending strength of wood: In the formula: —Design value of compressive strength parallel to grain (N / mm) 2 ); —Design value of tensile strength parallel to grain (N / mm) 2 ); —Design value of flexural strength parallel to grain (N / mm) 2 ); Referring to the calculation method of bearing capacity of steel-concrete composite columns, the "wood-like theory" is proposed. First, the cross-sectional area of ​​the arch is obtained by the relationship between the compressive strength of steel and wood, as shown in formula (40). Next, the design value of the compressive strength of wood is obtained by the principle that the compressive strength of the arch cross section remains unchanged, as shown in formula (41). Then, the elastic modulus is obtained by the principle that the overall compressive stiffness of the arch cross section remains unchanged, as shown in formula (42). Finally, the bearing capacity of the steel-wood composite arch is obtained by the formula for verifying the bearing capacity of the compression-bending member. In the formula: —Converted arch cross-sectional area (mm²) 2 ); —Arch cross-section timber area (mm²) 2 ); —Area of ​​steel in the arch section (mm²) 2 ); —Design value of compressive strength of steel (N / mm) 2 ); —Design value of compressive strength of wood (N / mm) 2 ); —Original area of ​​the arch cross section (mm²) 2 ); —Converted design value of wood compressive strength (N / mm) 2 ); —Converted wood elastic modulus (N / mm) 2 ); — Modulus of elasticity of timber in arch section (N / mm) 2 ); — Modulus of elasticity of arch section steel (N / mm) 2 ).

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