A method and device for determining the configuration of a temporary structure of a bridge, and an electronic device

Abstract

This invention provides a method, apparatus, and electronic device for determining the configuration of a temporary bridge structure, relating to the field of bridge design technology. The method for determining the configuration of a temporary bridge structure includes: acquiring component element information and connection relationship information between component elements of the target temporary structure; obtaining the length and internal force expressions of each component element of the target temporary structure based on the component element information and the connection relationship information; obtaining a configuration evaluation function of the target temporary structure based on the product of the length and internal force expressions of each component element and the weight coefficient assigned to each component element; obtaining the optimized topology of the target temporary structure based on the configuration evaluation function using partial differential equations; and determining the configuration of the target temporary structure based on the optimized topology. This invention can efficiently and cost-effectively obtain a stable temporary structure design scheme.

Description

Technical Field

[0001] This invention relates to the field of bridge design technology, and in particular to a method, apparatus, and electronic device for determining the configuration of a temporary bridge structure. Background Technology

[0002] The key to temporary structural design is designing a force transmission path that meets functional requirements. This involves material selection, configuration selection, various inherent proportional relationships related to stress, local and overall structural stability analysis, and nonlinear analysis of the structure and materials. An excellent structural design lies in understanding material properties and finding a structural form that matches them. The rationality of structural stress distribution hinges on the formulation of the configuration and proportional relationships.

[0003] In related technologies, there are various methods for proposing configurations, such as analogy methods and methods referencing natural selection (the principle of minimum energy), to obtain a stable temporary structural design scheme, all of which require a long time period. In the design of temporary structures, since the structure usually needs to be erected and withstand certain loads in a short period of time, related technologies cannot meet the requirements of rapid erection, stability, and economy for temporary structures.

[0004] Therefore, how to obtain a stable temporary structural design scheme efficiently and at low cost is an urgent technical problem to be solved. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a method, apparatus and electronic device for determining the configuration of a temporary bridge structure, so as to obtain a stable temporary structure design scheme in an efficient and low-cost manner.

[0006] This invention provides a method for determining the configuration of a temporary bridge structure, comprising the following steps.

[0007] Obtain the component element information and connection relationship information between the component elements of the target temporary structure; based on the component element information and connection relationship information, obtain the length expression and internal force expression of each component element of the target temporary structure; based on the product of the length expression and internal force expression of each component element, and the weight coefficient assigned to each component element, obtain the configuration evaluation function of the target temporary structure; using partial differential equations, obtain the optimized topology of the target temporary structure based on the configuration evaluation function; and determine the configuration of the target temporary structure based on the optimized topology.

[0008] According to a method for determining the configuration of a temporary bridge structure provided by the present invention, the target temporary structure is a seven-bar rhomboid hanging basket, and the component units of the target temporary structure include multiple compression members and multiple tension members. The method for obtaining the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between the component units includes: establishing length expressions for each compression member and each tension member using the length, first vertical distance, second vertical distance, and third vertical distance of the tension member (with the seven-bar rhomboid hanging basket as the zero member) as variables; wherein, the first vertical distance is the vertical distance between the vertex of the seven-bar rhomboid hanging basket located on the first side and the zero member. The second vertical distance is the vertical distance between the vertex of the seven-bar rhomboid hanging basket located on the second side and the zero bar; the third vertical distance is the vertical distance between the vertex of the seven-bar rhomboid hanging basket located in the middle position and the zero bar; according to the force transmission path of the seven-bar rhomboid hanging basket, based on the connection relationship information between each compression bar and each tension bar, the nodal load borne by the seven-bar rhomboid hanging basket is statically decomposed to obtain the internal force expressions of each compression bar and each tension bar; the configuration evaluation function of the target temporary structure is obtained based on the product between the length expression and the internal force expression of each component element, and the weight coefficient assigned to each component element, including: based on the weight coefficient assigned to each tension bar and compression bar. The weighting coefficients are used to perform a weighted summation of the products between the length expressions and internal force expressions of each compression and tension member to obtain the configuration evaluation function; wherein, the weighting coefficient of the tension member is 1, and the weighting coefficient of the compression member is the reciprocal of the stability coefficient of the compression member; the step of using partial differential equations to obtain the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure includes: taking the first vertical distance and the second vertical distance as optimization variables respectively, performing partial differential equations on the configuration evaluation function to obtain the length ratio relationship between the first vertical distance, the second vertical distance, and the third vertical distance respectively; using the third vertical distance... The proportional coefficient between the first horizontal distance and the first vertical distance, and the length proportional relationship between the first vertical distance, the second vertical distance and the third vertical distance, are used to eliminate the first vertical variable, the second vertical variable and the third vertical variable from the configuration evaluation function, resulting in an optimized configuration evaluation function using the first horizontal distance and the proportional coefficient as optimization variables; wherein, the first distance is a preset value of the horizontal distance between the stress point of the nodal load and the zero rod; using the first horizontal distance and the proportional coefficient as optimization variables, partial differential operations are performed on the optimized configuration evaluation function to obtain the optimized topology of the seven-rod rhomboid hanging basket;The optimized topology of the seven-bar diamond-shaped hanging basket is represented by an expression based on the relationship between the first vertical distance, the second vertical distance, the third vertical distance, the first horizontal distance, and the stability coefficient of the compression rod.

[0009] According to the present invention, a method for determining the configuration of a temporary bridge structure is provided. The target temporary structure is a triangular bracket, and the component units of the target temporary structure include compression members and tension members. The method for obtaining the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between the component units includes: establishing the length expression of the compression member by using the length of the tension member as a first variable and the proportional relationship between the projected length of the compression member on the installation plane and the length of the tension member as a second variable; statically decomposing the nodal load borne by the triangular bracket according to the force transmission path of the triangular bracket and the proportional relationship between the lengths of the compression member and the tension member and their projected lengths on the installation plane, to obtain the internal force expressions of the tension member and the compression member; and then, based on the product of the length expression and internal force expression of each component unit and the weighting coefficient assigned to each component unit... The process of obtaining the configuration evaluation function of the target temporary structure includes: weighting and summing the products of the length expressions and internal force expressions of the compression rod and the tension rod according to the weight coefficients assigned to the tension rod and the compression rod; wherein the weight coefficient of the tension rod is 1, and the weight coefficient of the compression rod is the reciprocal of the stability coefficient of the compression rod; the process of obtaining the optimized topology of the target temporary structure based on the configuration evaluation function using partial differential equations includes: taking the proportional relationship between the length of the tension rod and the projection distance of the compression rod on the mounting plane as the optimization variable, and performing partial differential equations on the configuration evaluation function to obtain the optimized topology of the triangular bracket; wherein the optimized topology of the triangular bracket is expressed using the proportional relationship between the length of the tension rod and the projection length of the compression rod on the mounting plane as the dependent variable, and the stability coefficient of the compression rod as the independent variable.

[0010] According to the present invention, a method for determining the configuration of a temporary bridge structure is provided, wherein the target temporary structure is a chordal triangular web truss; the component units of the target temporary structure include: multiple upper chords, multiple lower chords, and multiple web members; wherein the lengths of the upper chords and the lower chords are the same, equal to the truss pitch; the method for obtaining the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between the component units includes: establishing the length expression of the web members using the truss pitch and a first proportional relationship as variables; wherein the first proportional relationship is the proportional relationship between the truss height and the truss pitch; According to the force transmission path of the flat-chord triangular web truss, the nodal loads borne by the flat-chord triangular web truss are statically decomposed based on the truss pitch, the first proportional relationship, and the number of sections, respectively, to obtain the internal force expressions for each web member, each top chord member, and each bottom chord member; wherein, the internal force expression for each web member includes a first internal force expression when the number of sections is odd, and a second internal force expression when the number of sections is even; the configuration evaluation function of the target temporary structure is obtained based on the product between the length expression and the internal force expression of each component element, and the weight coefficient assigned to each component element, including: based on the weight coefficient assigned to each top chord member... The weight coefficients assigned to the upper chord, lower chord, and web members are used to weight and sum the products of the length and internal force expressions for each upper chord, the length and internal force expressions for each lower chord, and the length and first internal force expression for each web member, resulting in a first configuration evaluation function. Based on the weight coefficients assigned to each upper chord, lower chord, and web member, the weighted sum of the products of the length and internal force expressions for each upper chord, the length and internal force expressions for each lower chord, and the length and second internal force expressions for each web member is then used to weight and sum the products, resulting in a second configuration evaluation function. The weight coefficients for the lower chord are... The weight coefficient of the upper chord is 1, which is the reciprocal of its stability coefficient, and the weight coefficient of the web member is the sum of the reciprocal of its stability coefficient and the number 1. The step of using partial differential equations to obtain the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure includes: using the first proportional relationship as an optimization variable, performing partial differential equations on the first configuration evaluation function and the second configuration evaluation function respectively to obtain a first optimized topology and a second optimized topology; wherein, both the first optimized topology and the second optimized topology are the height-to-span ratio of the flat-chord triangular web member truss expressed using the proportional relationship between the first proportional relationship and the number of sections.

[0011] The present invention also provides a configuration determination device for a temporary bridge structure, comprising the following modules: a first acquisition module, used to acquire component unit information and connection relationship information between component units of a target temporary structure; a second acquisition module, used to obtain the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between component units; a third acquisition module, used to obtain the configuration evaluation function of the target temporary structure based on the product between the length expression and the internal force expression of each component unit and the weight coefficient assigned to each component unit; a fourth acquisition module, used to obtain the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure using partial differential equations; and a determination module, used to determine the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the configuration determination method for a temporary bridge structure as described above.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the configuration determination method for a temporary bridge structure as described above.

[0014] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the configuration determination method for a temporary bridge structure as described above.

[0015] The present invention provides a method, apparatus, and electronic device for determining the configuration of a temporary bridge structure. Utilizing a class analysis method, based on component element information and the connection relationships between component elements, the length and internal force expressions of each component element of the target temporary structure are obtained. Based on the product of the length and internal force expressions of each component element and the weight coefficients assigned to each component element, a configuration evaluation function for the target temporary structure is obtained. Using a topology optimization method and partial differential equations, the optimized topology of the target temporary structure can be obtained based on the configuration evaluation function. During design, only the dimensional parameters in the optimized topology of the target temporary structure need to be determined to determine its configuration. The configuration of the target temporary structure is then imported into finite element analysis software and drawing software for temporary structure design. This results in a stable temporary structure design scheme obtained efficiently and at low cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating the method for determining the configuration of a temporary bridge structure provided by the present invention.

[0018] Figure 2 This is a flowchart illustrating the method for determining the configuration of a seven-bar rhomboid hanging basket provided by the present invention.

[0019] Figure 3 This is a flowchart illustrating the method for determining the configuration of the triangular bracket provided by the present invention.

[0020] Figure 4 This is a flowchart illustrating the method for determining the configuration of a flat-chord triangular web truss provided by the present invention.

[0021] Figure 5 This is a simplified schematic diagram of the calculation of the seven-bar diamond-shaped hanging basket provided by the present invention.

[0022] Figure 6 This is a schematic diagram of the topology optimization results of the seven-bar rhomboid hanging basket provided by the present invention.

[0023] Figure 7 This is a schematic diagram of the configuration of the seven-bar diamond-shaped hanging basket provided by the present invention.

[0024] Figure 8 This is a schematic diagram of the planar structure of the triangular bracket provided by the present invention.

[0025] Figure 9 This is a simplified schematic diagram of the calculation of a flat chord triangular web truss provided by the present invention.

[0026] Figure 10 This is a schematic diagram illustrating the variation trend of the truss height-to-span ratio with different numbers of trusses provided by the present invention.

[0027] Figure 11 This is a schematic diagram of the multi-set flat-chord triangular web truss structure provided by the present invention.

[0028] Figure 12 This is a schematic diagram of the configuration determination device for temporary bridge structures provided by the present invention.

[0029] Figure 13 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this 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 this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] The following is combined with Figures 1-11 The present invention describes a method for determining the configuration of a temporary bridge structure.

[0032] Figure 1 This is a flowchart illustrating the method for determining the configuration of temporary bridge structures provided by the present invention, as shown below. Figure 1 As shown, the method includes the following:

[0033] Step 101: Obtain the component unit information of the target temporary structure and the connection relationship information between the component units.

[0034] The target temporary structure is a bridge temporary structure whose configuration needs to be determined.

[0035] Temporary bridge structures are structures designed and erected temporarily for the construction or maintenance of a specific bridge. These structures are typically used to support various operations during bridge construction, such as concrete pouring and steel reinforcement installation, and are dismantled after the main bridge structure is completed.

[0036] Component units refer to parts or components used to form temporary structures of bridges, such as tie rods and compression rods.

[0037] In the specific implementation process, the component unit information can include the types (e.g., beam units, truss units, or cable units) and quantities of various component units used to construct the target temporary structure. The connection relationship information includes the connection sequence information between each component unit, as well as the angle information between two adjacent component units.

[0038] Step 102: Based on the component unit information and the connection relationship information between component units, obtain the length expression and internal force expression of each component unit of the target temporary structure.

[0039] In the specific implementation process, for different types of target temporary structures, the length expressions and internal force expressions of each component element of the target temporary structure can be obtained in various ways based on the component element information and the connection relationship information between component elements, without being limited by the description in this specification.

[0040] For example, the length of a component element can be selected as a variable based on the connection sequence information between component elements and the angle information between two adjacent component elements. Based on the length of the component elements as variables, the length expression for each component element can be obtained. For target temporary structures with symmetrical structures, the symmetry of the structure can be utilized to reduce the number of length variables in the analysis.

[0041] For example, based on the connection sequence information between component units and the angle information between two adjacent component units, and according to the force transmission path of the target temporary structure, the internal force expression of each component unit can be obtained by static decomposition.

[0042] For multiple embodiments regarding obtaining the length expressions and internal force expressions of each component element of the target temporary structure based on component element information and the connection relationship information between component elements, see [link to relevant documentation]. Figure 2 , Figure 3 as well as Figure 4 The relevant content will not be repeated here.

[0043] Step 103: Based on the product of the length expression and the internal force expression of each component element, and the weight coefficient assigned to each component element, obtain the configuration evaluation function of the target temporary structure.

[0044] Configuration evaluation functions can be used to statistically analyze the material usage (or total value, etc.) of different force transmission paths. By taking the partial derivative of the configuration evaluation function, the topological structure of the optimal configuration of the target temporary structure can be obtained.

[0045] In practice, weighting coefficients can be assigned to each component unit based on experimental results or construction experience. For example, for truss units and beam units, weighting coefficients can be assigned based on the stability coefficients of tension and compression members; for cable units, weighting coefficients can be assigned based on the value ratio.

[0046] For several embodiments of obtaining the configuration evaluation function of the target temporary structure based on the product of the length expression and the internal force expression of each component element, and the weighting coefficient assigned to each component element, see [link to relevant documentation]. Figure 2 , Figure 3 as well as Figure 4 The relevant content will not be repeated here.

[0047] Step 104: Using partial differential equations, obtain the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure.

[0048] The configuration evaluation function includes two types of parameters: dimensional parameters and shape parameters. Dimensional parameters include known design quantities such as load magnitude and the distance the load is transferred to the boundary. Shape parameters include the configuration proportions of the load transfer path, which can be angular or length proportions. Since the exponents of the dimensional parameters are all of the first order, they can be separated by introducing a proportionality coefficient. Because configuration parameters are generally nonlinear, direct solutions can be very difficult. Partial differential equations can be used to find the optimal configuration parameter values ​​that achieve the optimal configuration evaluation function.

[0049] In the specific implementation process, by using partial differential equations, the optimized topology of the target temporary structure represented by the configuration parameters can be obtained.

[0050] For several embodiments on obtaining the optimized topology of the target temporary structure using partial differential equations and based on the configuration evaluation function of the target temporary structure, see [link to relevant documentation]. Figure 2 , Figure 3 as well as Figure 4 The relevant content will not be repeated here.

[0051] Step 105: Determine the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0052] In the specific implementation process, the optimal configuration parameters that can achieve the construction purpose can be selected by optimizing the topology of the target temporary structure, and then the configuration of the target temporary structure can be determined based on the optimal configuration parameters.

[0053] For several embodiments regarding determining the configuration of the target temporary structure based on the optimized topology of the target temporary structure, see [link to relevant documentation]. Figure 2 , Figure 3 as well as Figure 4 The relevant content will not be repeated here.

[0054] Figure 2 This is a flowchart illustrating the method for determining the configuration of a seven-bar rhomboid hanging basket provided by the present invention. In this embodiment, the target temporary structure is a seven-bar rhomboid hanging basket, such as... Figure 2 As shown, the method includes the following:

[0055] Step 201: Using the length of the pull rod, the first vertical distance, the second vertical distance, and the third vertical distance of the seven-bar rhomboid hanging basket as the zero rod, establish the length expressions for each pressure rod and each pull rod respectively.

[0056] The component unit of the seven-bar diamond-shaped hanging basket includes multiple compression rods and multiple tension rods, such as... Figure 5 As shown, the blue rod is the tension rod (rod ① is the zero rod), and the red rod is the compression rod.

[0057] like Figure 5As shown, the first vertical distance is H1, which is the vertical distance between the vertex of the seven-bar rhomboid hanging basket on the first side and the zero bar; the second vertical distance is H2, which is the vertical distance between the vertex of the seven-bar rhomboid hanging basket on the second side and the zero bar; and the third vertical distance is H, which is the vertical distance between the vertex of the seven-bar rhomboid hanging basket in the middle position and the zero bar.

[0058] As an example only, for such Figure 5 The seven-bar rhomboid hanging basket shown can be used to establish the length expressions of each compression bar and each tension bar as shown below, based on the force transmission path of the seven-bar rhomboid hanging basket, using the length of the tension bar (which serves as the zero bar) and the vertical distance between each vertex of the seven-bar rhomboid hanging basket and the zero bar as variables.

[0059] (1)

[0060] (2)

[0061] (3)

[0062] (4)

[0063] (5)

[0064] (6)

[0065] (7)

[0066] in, l The length of the zero rod, l 0~ l 7 is like Figure 5 The lengths of rods ① to ⑦ shown.

[0067] Step 202: Based on the force transmission path of the seven-bar rhomboid hanging basket and the connection relationship information between each compression bar and each tension bar, perform static decomposition on the nodal load borne by the seven-bar rhomboid hanging basket to obtain the internal force expressions of each compression bar and each tension bar.

[0068] As an example only, for such Figure 5 The seven-bar rhomboid hanging basket shown can be statically decomposed according to the force transmission path of the seven-bar rhomboid hanging basket and the connection relationship information between each compression bar and each tension bar, so as to obtain the internal force expressions of each compression bar and each tension bar as shown below.

[0069] (8)

[0070] (9)

[0071] (10)

[0072] (11)

[0073] (12)

[0074] (13)

[0075] (14)

[0076] Where P is the nodal load. N 0~ N 7 is like Figure 5 The internal forces of rods ① to ⑦ shown.

[0077] Step 203: Based on the weighting coefficients assigned to each tension and compression member, perform a weighted summation of the products between the length expressions and internal force expressions for each compression and tension member to obtain the configuration evaluation function.

[0078] In practical implementation, the weighting coefficient of the tie rod can be set to 1, and the weighting coefficient of the compression rod can be the reciprocal of the stability coefficient ϕ of the compression rod.

[0079] As an example only, for such Figure 5 The seven-bar rhomboid hanging basket shown can be used to obtain the first configuration evaluation function by weighted summation of the product between the length expression and the internal force expression of each compression and tension bar, based on the weight coefficients assigned to each tension and compression bar.

[0080] (15)

[0081] Step 204: Using the first vertical distance and the second vertical distance as optimization variables, perform partial differential calculation on the configuration evaluation function to obtain the length ratio between the first vertical distance, the second vertical distance, and the third vertical distance.

[0082] As an example only, for such Figure 5 The seven-bar rhomboid hanging basket shown can be subjected to partial differential differentiation of the configuration evaluation function as shown below to obtain the length ratio between the first vertical distance, the second vertical distance, and the third vertical distance.

[0083] (16)

[0084] (17)

[0085] From Company (16) and Formula (17), the length ratio between the first vertical distance and the third vertical distance can be obtained as follows: The length ratio between the second vertical distance and the third vertical distance is: .

[0086] Step 205: Using the proportional coefficient between the third vertical distance and the first horizontal distance, and the length ratio between the first vertical distance, the second vertical distance, and the third vertical distance, respectively, eliminate the first vertical variable, the second vertical variable, and the third vertical variable from the configuration evaluation function to obtain the optimized configuration evaluation function using the first horizontal distance and the proportional coefficient as optimization variables.

[0087] like Figure 5 As shown, the first distance is a preset value of the horizontal distance between the point of application of the nodal load P and the zero-load member. l 0.

[0088] As an example only, the length ratio between the first vertical distance and the third vertical distance obtained using formula (16) can be used as follows: And the length ratio between the second vertical distance and the third vertical distance obtained using formula (17). Substitute the configuration evaluation function as shown in formula (15), and introduce the proportional coefficient between the third vertical distance and the first horizontal distance. The configuration evaluation function variables are reduced from seven to five, resulting in the optimized configuration evaluation function shown below, which uses the first level distance and the scaling factor as optimization variables.

[0089] (18)

[0090] Among them, P, l 0 is a known constant. The variable is , and the rest are dependent variables. The parameters that need to be optimized are . l and k .

[0091] Step 206: Using the first horizontal distance and the proportional coefficient as optimization variables, perform partial differential calculations on the optimized configuration evaluation function to obtain the optimized topology of the seven-bar rhomboid hanging basket.

[0092] As an example only, for such Figure 5 The seven-bar rhomboid hanging basket shown is used with the first horizontal distance and the proportional coefficient as optimization variables. The partial differential operation of the optimized configuration evaluation function is performed as shown below.

[0093] (19)

[0094] (20)

[0095] The optimized topology of the seven-bar rhomboid hanging basket is shown below, expressed using an expression based on the relationship between the first vertical distance, the second vertical distance, the third vertical distance, the first horizontal distance, and the stability coefficient of the compression bar.

[0096] (twenty one)

[0097] (twenty two)

[0098] (twenty three)

[0099] (twenty four)

[0100] Among them, variables The value range of is 0~1, and the optimized topology result is as follows: Figure 6 As shown in section (a), the vertices of the three compression members meet at a circle whose radius ranges from... ~ The anchoring ends of the hanging basket form a quarter honeycomb structure, when using When the radius is used, the internal forces of all members except the zero-force member are equal, which is equal to the nodal load. When adopting When the radius is used, the internal force of rod 7 is equal to the nodal load. Apart from that, the loads on all other members are less than the nodal loads. It is recommended that the hanging basket design follow... The cross-section and length of the members are designed for the radius. When encountering heavy loads on short sections, the elevation angle of member 7 can be increased to improve the load-bearing capacity of the hanging basket.

[0101] In the specific implementation process, the final structure of the seven-bar diamond-shaped hanging basket is as follows: Figure 7 As shown, the dashed line indicates that the boom can be adjusted in amplitude.

[0102] In some embodiments, when a five-bar hanging basket is used, the topology optimization results obtained using the embodiments of the present invention are as follows: Figure 6 As shown in part (b), the rear anchor length of the hanging basket is greater than that of the seven-bar hanging basket, and the internal force of the bar is greater than that of the seven-bar hanging basket.

[0103] Figure 3 This is a flowchart illustrating the method for determining the configuration of a triangular bracket provided by the present invention. In this embodiment, the target temporary structure is a triangular bracket, and the component units of the target temporary structure include: compression members and tension members, such as... Figure 3 As shown, the method includes the following:

[0104] Step 301: Using the length of the tie rod as the first variable and the proportional relationship between the projected length of the compression rod on the mounting plane and the length of the tie rod as the second variable, establish the expression for the length of the compression rod.

[0105] Triangular brackets, as a common form of high-altitude support, are frequently used in construction parts such as the zero block of cantilever bridges, straight sections of high pier side spans, cable tower beams, cable-stayed platforms, and large cantilever cap beams. They are also commonly used in high-altitude platforms such as tower cranes, elevators, and walkways.

[0106] like Figure 8 The triangular bracket shown has a tie rod (blue) of length A, a compression rod (red) of length C, and a projected length B on the mounting plane. The nodal load borne by this bracket is P. The proportional relationship between the projected length of the compression rod on the mounting plane and the length of the tie rod is as follows:

[0107] (25)

[0108] As an example only, for such Figure 8 For the triangular bracket shown, establish the length expression of the compression bar as shown below.

[0109] (26)

[0110] Step 302: According to the force transmission path of the triangular bracket, based on the proportional relationship between the length of the compression member and the length of the tie member and the projected length of the compression member on the installation plane, the nodal load borne by the triangular bracket is statically decomposed to obtain the internal force expressions of the tie member and the compression member.

[0111] As an example only, for such Figure 8 For the triangular bracket shown, establish the internal force expressions for the tension rod and the compression rod as shown below.

[0112] (27)

[0113] (28)

[0114] Step 303: Based on the weighting coefficients assigned to the tension and compression members, perform a weighted summation of the products between the length expressions and internal force expressions of the compression and tension members to obtain the configuration evaluation function.

[0115] In practice, the weighting coefficient of the tie rod can be set to 1, and the weighting coefficient of the compression rod can be the reciprocal of the stability coefficient of the compression rod.

[0116] As an example only, for such Figure 8 The triangular bracket shown is used to establish the configuration evaluation function as shown below.

[0117] (29)

[0118] Step 304: Using the proportional relationship between the length of the tie rod and the projection distance of the compression rod on the mounting plane as optimization variables, perform partial differential calculation on the configuration evaluation function to obtain the optimized topology of the triangular bracket.

[0119] As an example only, for such Figure 8 The triangular bracket shown is subjected to partial differential differentiation of the configuration evaluation function as shown below to obtain the optimized topology of the triangular bracket.

[0120] (30)

[0121] The optimized topology of the triangular bracket is expressed by using the ratio between the length of the tie rod and the projected length of the compression rod on the mounting plane as the dependent variable and the stability coefficient of the compression rod as the independent variable.

[0122] Figure 4 This is a flowchart illustrating the method for determining the configuration of a chordal triangular web truss provided by the present invention. In this embodiment, the target temporary structure is a chordal triangular web truss.

[0123] A truss is a structure composed of members connected to each other at both ends by hinges. Trusses are planar or spatial structures composed of straight members, generally with triangular units. Truss members mainly bear axial tension or compression, thus making full use of the strength of the material. When the span is large, it can save material, reduce self-weight, and increase stiffness compared to solid beams.

[0124] A truss consists of a top chord, a bottom chord, and web members. Web members are further classified as either diagonal or straight. Due to the large slenderness ratio of the members, although the connections between members may be fixed, the actual bending moments at the member ends are generally very small. Therefore, in design analysis, they can be simplified to hinged connections. For simplified calculations, the members are all considered two-force members, bearing either compressive or tensile forces.

[0125] A single truss has relatively weak out-of-plane stiffness, therefore, out-of-plane bracing is required. When designing trusses, the out-of-plane stiffness is generally also designed as a truss structure, forming a whole with good stiffness in both directions. The chord members of a truss experience greater stress at mid-span, gradually decreasing towards the supports; while the web members experience the greatest stress near the supports, with relatively small stress at mid-span, and some even theoretically zero stress.

[0126] like Figure 4 As shown, the method for determining the configuration of a flat-chord triangular web truss includes the following:

[0127] Step 401: Using the truss section spacing and the first proportional relationship as variables, establish the expression for the length of the web members.

[0128] The structural units of a flat-chord triangular web truss include: multiple upper chords, multiple lower chords, and multiple web members; wherein the lengths of the upper and lower chords are the same, equal to the truss section spacing.

[0129] like Figure 9 As shown, the number of lower chord members in the flat chord triangular web truss is n, the number of upper chord members is n-1, the number of web members is 2n, and the truss segment spacing is... Truss height Length of diagonal bar The first proportional relationship is the ratio between the truss height and the truss segment spacing: (31)

[0130] In the specific implementation process, taking advantage of the symmetry of the chordal triangular web truss, half a span is analyzed to obtain the main parameters. Simultaneously, the entire chordal triangular web truss is analyzed based on the differences between odd and even spans.

[0131] As an example only, for such Figure 9 The length expression of the web members of the flat chord triangular web truss shown below is established with the truss pitch and the first proportional relationship as variables.

[0132] (32)

[0133] Step 402: According to the force transmission path of the flat chord triangular web truss, the nodal loads borne by the flat chord triangular web truss are statically decomposed based on the truss pitch, the first proportional relationship, and the number of pitches, respectively, to obtain the internal force expressions of each web member, each upper chord member, and each lower chord member.

[0134] As an example only, for such Figure 9 The planar chord triangular web truss shown below yields the following expressions for the internal forces of each top chord member. The expression for the internal forces in each lower chord. And the expression for the first internal force of each web member when the number of internodes is odd: Substituting formula (38) into formula (35) yields And the expression for the second internal force when the number of internodes is even: the result of substituting formula (39) into formula (35) .

[0135] (33)

[0136] (34)

[0137] (35)

[0138] (36)

[0139] (37)

[0140] (38)

[0141] (39)

[0142] Step 403: Based on the weighting coefficients assigned to each upper chord, lower chord, and web member, perform a weighted summation of the product between the length expression and the internal force expression for each upper chord member, the product between the length expression and the internal force expression for each lower chord member, and the product between the length expression and the first internal force expression for each web member, to obtain the first configuration evaluation function.

[0143] In practical implementation, the weighting coefficient of the upper chord can be set to the reciprocal of its stability coefficient, the weighting coefficient of the lower chord can be set to 1, and the weighting coefficient of the web members can be set to the sum of the reciprocal of their stability coefficient and the number 1. This is just an example, for cases such as... Figure 9 The flat chord triangular web truss shown can be used to construct the first configuration evaluation function when the number of segments is odd, as shown below.

[0144] (40)

[0145] Step 404: Based on the weighting coefficients assigned to each upper chord, lower chord, and web member, perform a weighted summation of the product between the length expression and the internal force expression for each upper chord member, the product between the length expression and the internal force expression for each lower chord member, and the product between the length expression and the second internal force expression for each web member, to obtain the second configuration evaluation function.

[0146] In practical implementation, the weighting coefficient of the upper chord can be set to the reciprocal of its stability coefficient, the weighting coefficient of the lower chord can be set to 1, and the weighting coefficient of the web members can be set to the sum of the reciprocal of their stability coefficient and the number 1. This is just an example, for cases such as... Figure 9 The flat chord triangular web truss shown can be used to construct the second configuration evaluation function when the number of segments is even, as shown below.

[0147] (41)

[0148] Step 405: Using the first proportional relationship as the optimization variable, perform partial differential operations on the first configuration evaluation function and the second configuration evaluation function respectively to obtain the first optimized topology and the second optimized topology.

[0149] As an example only, for such Figure 9 The flat-chord triangular web truss shown can be obtained by performing partial differential operations on the first configuration evaluation function and the second configuration evaluation function respectively to obtain the first optimized topology and the second optimized topology.

[0150] (42)

[0151] (43)

[0152] Both the first and second optimized topologies are the height-to-span ratios of a chordal triangular web truss, as shown below, expressed using the first proportional relationship and the proportional relationship between the number of segments.

[0153] (44)

[0154] Figure 10 The trend graph of the height-to-span ratio of a chordal triangular web truss with different numbers of spans is shown. Figure 11 The diagram shows multiple sets of flat chord triangular web truss structures obtained according to formula (44), wherein structural types 2 to 6 are suitable as trusses with loosely assembled members, and structural types 7 to 13 are suitable as trusses with segmental assembly.

[0155] The following describes the configuration determination device for temporary bridge structures provided by the present invention. The configuration determination device for temporary bridge structures described below and the configuration determination method for temporary bridge structures described above can be referred to in correspondence.

[0156] Figure 12 This is a schematic diagram of the configuration determination device for temporary bridge structures provided by the present invention, as shown below. Figure 12 As shown, the device includes the following modules.

[0157] The first acquisition module 1210 is used to acquire the component unit information of the target temporary structure and the connection relationship information between the component units.

[0158] The second acquisition module 1220 is used to obtain the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between the component units.

[0159] The third acquisition module 1230 is used to obtain the configuration evaluation function of the target temporary structure based on the product between the length expression and the internal force expression of each component element, and the weight coefficient assigned to each component element.

[0160] The fourth acquisition module 1240 is used to obtain the optimized topology of the target temporary structure by using partial differential equations and the configuration evaluation function of the target temporary structure.

[0161] The determination module 1250 is used to determine the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0162] Figure 13 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 13 As shown, the electronic device may include a processor 1310, a communications interface 1320, a memory 1330, and a communication bus 1340, wherein the processor 1310, the communications interface 1320, and the memory 1330 communicate with each other via the communication bus 1340. The processor 1310 can call logical instructions in the memory 1330 to execute a method for determining the configuration of a temporary bridge structure. This method includes: acquiring component unit information of the target temporary structure and connection relationship information between component units; obtaining the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between component units; obtaining the configuration evaluation function of the target temporary structure based on the product of the length expression and the internal force expression of each component unit and the weight coefficient assigned to each component unit; obtaining the optimized topology of the target temporary structure based on the configuration evaluation function using partial differential equations; and determining the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0163] Furthermore, the logical instructions in the aforementioned memory 1330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0164] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the configuration determination method for a temporary bridge structure provided by the above methods. The method includes: acquiring component unit information of the target temporary structure and connection relationship information between component units; obtaining the length expression and internal force expression of each component unit of the target temporary structure based on the component unit information and the connection relationship information between component units; obtaining the configuration evaluation function of the target temporary structure based on the product between the length expression and the internal force expression of each component unit and the weight coefficient assigned to each component unit; obtaining the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure using partial differential equations; and determining the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0165] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for determining the configuration of a temporary bridge structure provided by the methods described above. This method includes: acquiring component element information of a target temporary structure and connection relationship information between component elements; obtaining length expressions and internal force expressions for each component element of the target temporary structure based on the component element information and the connection relationship information between component elements; obtaining a configuration evaluation function for the target temporary structure based on the product of the length expression and the internal force expression of each component element, and a weight coefficient assigned to each component element; obtaining an optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure using partial differential equations; and determining the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

[0166] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0167] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0168] 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 method for determining the configuration of a temporary bridge structure, characterized in that, include: Obtain the component unit information of the target temporary structure and the connection relationship information between the component units; wherein, the target temporary structure is a flat chord triangular web truss; the component unit of the target temporary structure includes: multiple upper chords, multiple lower chords, and multiple web members; the lengths of the upper chords and the lower chords are the same, equal to the truss section spacing; Based on the component unit information and the connection relationship information between the component units, the length expressions and internal force expressions of each component unit of the target temporary structure are obtained, including: Using the truss pitch and a first proportional relationship as variables, establish an expression for the length of the web member; wherein, the first proportional relationship is the proportional relationship between the truss height and the truss pitch. According to the force transmission path of the flat chord triangular web truss, the nodal loads borne by the flat chord triangular web truss are statically decomposed based on the truss pitch, the first proportional relationship, and the number of sections, respectively, to obtain the internal force expressions of each web member, each upper chord member, and each lower chord member; wherein, the internal force expression of each web member includes a first internal force expression when the number of sections is odd, and a second internal force expression when the number of sections is even; Based on the product of the length expression and the internal force expression for each component element, and the weighting coefficient assigned to each component element, the configuration evaluation function of the target temporary structure is obtained, including: Based on the weighting coefficients assigned to each upper chord, lower chord, and web member, the product between the length expression and internal force expression of each upper chord member, the product between the length expression and internal force expression of each lower chord member, and the product between the length expression and the first internal force expression of each web member are weighted and summed to obtain the first configuration evaluation function. Based on the weighting coefficients assigned to each top chord, bottom chord, and web member, the product of the length expression and internal force expression for each top chord member, the product of the length expression and internal force expression for each bottom chord member, and the product of the length expression and the second internal force expression for each web member are weighted and summed to obtain the second configuration evaluation function; wherein, the weighting coefficient of the bottom chord member is 1, the weighting coefficient of the top chord member is the reciprocal of its stability coefficient, and the weighting coefficient of the web member is the sum of the reciprocal of its stability coefficient and the number 1; Using partial differential equations, the optimized topology of the target temporary structure is obtained based on the configuration evaluation function of the target temporary structure, including: Using the first proportional relationship as an optimization variable, partial differential operations are performed on the first configuration evaluation function and the second configuration evaluation function to obtain the first optimized topology and the second optimized topology; wherein, the first optimized topology and the second optimized topology are both the height-span ratio of the flat chord triangular web truss expressed by the proportional relationship between the first proportional relationship and the number of sections. The configuration of the target temporary structure is determined based on the optimized topology of the target temporary structure.

2. A device for determining the configuration of a temporary bridge structure, characterized in that, include: The first acquisition module is used to acquire component unit information of the target temporary structure and connection relationship information between component units; wherein, the target temporary structure is a flat chord triangular web truss; the component unit of the target temporary structure includes: multiple upper chords, multiple lower chords, and multiple web members; the lengths of the upper chords and the lower chords are the same, equal to the truss section spacing; The second acquisition module is used to obtain the length expression and internal force expression of each component element of the target temporary structure based on the component element information and the connection relationship information between the component elements, including: Using the truss pitch and a first proportional relationship as variables, establish an expression for the length of the web member; wherein, the first proportional relationship is the proportional relationship between the truss height and the truss pitch. According to the force transmission path of the flat chord triangular web truss, the nodal loads borne by the flat chord triangular web truss are statically decomposed based on the truss pitch, the first proportional relationship, and the number of sections, respectively, to obtain the internal force expressions of each web member, each upper chord member, and each lower chord member; wherein, the internal force expression of each web member includes a first internal force expression when the number of sections is odd, and a second internal force expression when the number of sections is even; The third acquisition module is used to obtain the configuration evaluation function of the target temporary structure based on the product between the length expression and the internal force expression of each component element, and the weight coefficient assigned to each component element, including: Based on the weighting coefficients assigned to each upper chord, lower chord, and web member, the product between the length expression and internal force expression of each upper chord member, the product between the length expression and internal force expression of each lower chord member, and the product between the length expression and the first internal force expression of each web member are weighted and summed to obtain the first configuration evaluation function. Based on the weighting coefficients assigned to each top chord, bottom chord, and web member, the product of the length expression and internal force expression for each top chord member, the product of the length expression and internal force expression for each bottom chord member, and the product of the length expression and the second internal force expression for each web member are weighted and summed to obtain the second configuration evaluation function; wherein, the weighting coefficient of the bottom chord member is 1, the weighting coefficient of the top chord member is the reciprocal of its stability coefficient, and the weighting coefficient of the web member is the sum of the reciprocal of its stability coefficient and the number 1; The fourth acquisition module is used to obtain the optimized topology of the target temporary structure based on the configuration evaluation function of the target temporary structure using partial differential equations, including: Using the first proportional relationship as an optimization variable, partial differential operations are performed on the first configuration evaluation function and the second configuration evaluation function to obtain the first optimized topology and the second optimized topology; wherein, the first optimized topology and the second optimized topology are both the height-span ratio of the flat chord triangular web truss expressed by the proportional relationship between the first proportional relationship and the number of sections. The determination module is used to determine the configuration of the target temporary structure based on the optimized topology of the target temporary structure.

3. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for determining the configuration of a temporary bridge structure as described in any one of claims 1 to 2.

4. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the configuration of a temporary bridge structure as described in any one of claims 1 to 2.

5. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the configuration of a temporary bridge structure as described in any one of claims 1 to 2.

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