Method and system for determining flexural rigidity of transverse joint of upper and lower block prefabricated box culvert and storage medium thereof

Abstract

The invention provides a method and a system for determining the flexural rigidity of a transverse joint of an upper and lower block prefabricated box culvert and a storage medium thereof, and belongs to the technical field of bridge engineering, and the method comprises the following steps: determining a joint combination type; selecting proper correction coefficients alpha and beta and initial rigidities K0 and theta0 according to a joint combination type; the maximum bending moment internal force value M generated by the transverse joint of the prefabricated box culvert under the action of external force is calculated; calculating the ratio lambda of the steel bar section strength to the concrete section strength; calculating the maximum joint corner value theta generated by the transverse joint of the prefabricated box culvert under the action of external force; further calculating the flexural rigidity of the transverse joint; according to the technical scheme, calculation of the bending rigidity of the transverse joint of the upper and lower block prefabricated box culvert can be more accurate and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a method for determining the bending stiffness of a transverse joint of an upper and lower prefabricated box culvert, a system and a storage medium thereof. Background Art

[0002] With the acceleration of urbanization, the demand for infrastructure construction is growing. As an important urban drainage and transportation facility, the stability and durability of the structure of prefabricated box culverts directly affect the safety and service life of the project. Prefabricated box culverts usually adopt modular design and are assembled in upper and lower blocks to improve construction efficiency and reduce costs. However, during the modular assembly process, the bending strength of the transverse joints is a key factor in ensuring the overall performance of the box culvert.

[0003] The traditional method for determining the bending strength of transverse joints of prefabricated box culverts mainly relies on empirical formulas and test data, which has certain limitations. For example, empirical formulas are often based on test results under specific conditions and are difficult to adapt to changing engineering environments and material properties. The collection and analysis of test data is time-consuming and labor-intensive, and the results may deviate due to different sample selection and test conditions. In addition, when calculating the bending stiffness of transverse joints, existing methods often ignore the influence of factors such as joint combination type, material properties, and construction technology, resulting in limited accuracy and reliability of the calculation results. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method, system and storage medium for determining the bending stiffness of the transverse joints of upper and lower prefabricated box culverts, so that the calculation of the bending stiffness of the joints of the modular upper and lower assembled box culvert connection structure is more accurate and reliable.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a method for determining the bending stiffness of the transverse joints of upper and lower prefabricated box culverts, comprising the following steps:

[0007] Determine the combination type of transverse joints of upper and lower prefabricated box culverts;

[0008] According to the joint combination type, the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joint are determined respectively;

[0009] Calculate the maximum internal force value M of the bending moment generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ;

[0010] The maximum joint rotation angle θ of the transverse joint of the prefabricated box culvert under the action of external force is calculated using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ.

[0011] The bending stiffness of the transverse joints of the upper and lower prefabricated box culverts is calculated using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

[0012] Furthermore, the maximum bending moment internal force value M is expressed by the formula:

[0013] M=0.5f py A p b;

[0014] The maximum seam angle value θ is expressed by the formula:

[0015] θ=βλ+θ0;

[0016] The ratio of steel section strength to concrete section strength λ is expressed by the formula:

[0017] λ=f py A p / f c bl;

[0018] The calculation formula of transverse joint bending stiffness is expressed as:

[0019]

[0020] Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2 ); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

[0021] Furthermore, the joint combination types include socket type + bent bolts, socket type + precision-rolled threaded steel rods, and flat-end type + precision-rolled threaded steel rods.

[0022] Furthermore, when the joint combination type is socket type + bent bolt, the correction coefficient α is 0.14, when the joint combination type is socket type + finished rolled threaded steel bar, the correction coefficient α is 0.215, and when the joint combination type is flat type + finished rolled threaded steel bar, the correction coefficient α is 0.224;

[0023] For the joint combination type of socket type + bent bolt, the correction coefficient β is 0.27, for the socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14, for the flat type + precision rolled threaded steel bar, the correction coefficient β is 0.155;

[0024] For the joint combination type of socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, for the socket type + precision-rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, for the flat type + precision-rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad;

[0025] For the joint combination type of socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, for the socket type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, and for the flat type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

[0026] In a second aspect, the present invention provides a system for determining the bending stiffness of transverse joints of upper and lower prefabricated box culverts, comprising the following modules:

[0027] The initial parameter module is used to determine the combination type of the transverse joints of the upper and lower prefabricated box culverts; and determine the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joints according to the joint combination type;

[0028] The first calculation module is used to calculate the maximum bending moment internal force value M generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ;

[0029] The second calculation module is used to calculate the maximum joint rotation angle θ generated by the transverse joint of the prefabricated box culvert under the action of external force by using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ;

[0030] The bending strength determination module is used to calculate the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

[0031] Furthermore, the joint combination types are divided into three types: socket type + bent bolts, socket type + precision-rolled threaded steel bars, and flat type + precision-rolled threaded steel bars.

[0032] Furthermore, if the joint combination type is socket type + bent bolt, the correction coefficient α is 0.14, if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient α is 0.215, and if the joint combination type is flat type + precision rolled threaded steel bar, the correction coefficient α is 0.224;

[0033] If the joint combination type is socket type + bent bolt, the correction coefficient β is 0.27; if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14; if the joint combination type is plain type + precision rolled threaded steel bar, the correction coefficient β is 0.155;

[0034] If the joint combination type is socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, if the joint combination type is socket type + precision rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, if the joint combination type is flat type + precision rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad;

[0035] If the joint combination type is socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, if the joint combination type is socket type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, if the joint combination type is flat type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

[0036] Furthermore, the maximum bending moment internal force value M is expressed by the formula:

[0037] M=0.5f py A p b;

[0038] The maximum seam angle value θ is expressed by the formula:

[0039] θ=βλ+θ0;

[0040] The ratio of steel section strength to concrete section strength λ is expressed by the formula:

[0041] λ=f py A p / f c bl;

[0042] The calculation formula of transverse joint bending stiffness is expressed as:

[0043]

[0044] Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

[0045] In a third aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the program is configured to execute the method for determining the bending stiffness of transverse joints of upper and lower block prefabricated box culverts as described in any one of the first aspects.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The method, system and storage medium for determining the bending stiffness of transverse joints of upper and lower prefabricated box culverts of the present invention adopt different mechanical properties for different joint combination types to determine initial parameter data such as correction coefficient, initial stiffness and initial joint angle value, and introduce and fully consider the influence of material properties such as steel bars and concrete on the bending strength of transverse joints, as well as the maximum joint angle value, maximum bending moment internal force value and other properties under the action of external forces, so as to construct a calculation formula method for the bending stiffness of transverse joints of upper and lower prefabricated box culverts, which can make the calculation of the bending stiffness of the joints of the modular upper and lower assembled box culvert connection structure more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The present invention provides a flowchart of a method for determining the bending stiffness of transverse joints of upper and lower prefabricated box culverts according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] like Figure 1 As shown, an embodiment of the present invention provides a method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts, comprising the following steps:

[0053] Determine the combination type of transverse joints of upper and lower prefabricated box culverts;

[0054] According to the joint combination type, the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joint are determined respectively;

[0055] Calculate the maximum internal force value M of the bending moment generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ;

[0056] The maximum joint rotation angle θ of the transverse joint of the prefabricated box culvert under the action of external force is calculated using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ.

[0057] The bending stiffness of the transverse joints of the upper and lower prefabricated box culverts is calculated using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

[0058] In this embodiment, the maximum bending moment internal force value M is expressed by the formula:

[0059] M=0.5f py A p b;

[0060] The maximum seam angle value θ is expressed by the formula:

[0061] θ=βλ+θ0;

[0062] The ratio of steel section strength to concrete section strength λ is expressed by the formula:

[0063] λ=f py A p / f c bl;

[0064] The calculation formula of transverse joint bending stiffness is expressed as:

[0065]

[0066] Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2 ); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

[0067] In this embodiment, the joint combination types include socket type + bent bolts, socket type + precision-rolled threaded steel rods, and flat type + precision-rolled threaded steel rods.

[0068] For the joint combination type of socket type + bent bolt, the correction coefficient α is 0.14, for the socket type + precision-rolled threaded steel bar, the correction coefficient α is 0.215, and for the flat type + precision-rolled threaded steel bar, the correction coefficient α is 0.224;

[0069] For the joint combination type of socket type + bent bolt, the correction coefficient β is 0.27, for the socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14, for the flat type + precision rolled threaded steel bar, the correction coefficient β is 0.155;

[0070] For the joint combination type of socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, for the socket type + precision-rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, for the flat type + precision-rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad;

[0071] For the joint combination type of socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, for the socket type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, and for the flat type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

[0072] In a second aspect, an embodiment of the present invention provides a system for determining the bending stiffness of transverse joints of upper and lower prefabricated box culverts, including the following modules:

[0073] The initial parameter module is used to determine the combination type of the transverse joints of the upper and lower prefabricated box culverts; and determine the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joints according to the joint combination type;

[0074] The first calculation module is used to calculate the maximum bending moment internal force value M generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ;

[0075] The second calculation module is used to calculate the maximum joint rotation angle θ generated by the transverse joint of the prefabricated box culvert under the action of external force by using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ;

[0076] The bending strength determination module is used to calculate the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

[0077] In the initial parameter module, the joint combination types are divided into three types: socket type + bent bolts, socket type + precision-rolled threaded steel bars, and flat type + precision-rolled threaded steel bars.

[0078] If the joint combination type is socket type + bent bolt, the correction coefficient α is 0.14; if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient α is 0.215; if the joint combination type is plain type + precision rolled threaded steel bar, the correction coefficient α is 0.224;

[0079] If the joint combination type is socket type + bent bolt, the correction coefficient β is 0.27; if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14; if the joint combination type is plain type + precision rolled threaded steel bar, the correction coefficient β is 0.155;

[0080] If the joint combination type is socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, if the joint combination type is socket type + precision rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, if the joint combination type is flat type + precision rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad;

[0081] If the joint combination type is socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, the joint combination type is socket type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, and the joint combination type is flat type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

[0082] In the first calculation module, the maximum bending moment internal force value M is expressed by the formula:

[0083] M=0.5f py A p b;

[0084] In the second calculation module, the maximum seam angle value θ is expressed by the formula:

[0085] θ=βλ+θ0;

[0086] In the first calculation module, the ratio of the steel section strength to the concrete section strength λ is expressed as:

[0087] λ=f py A p / f c bl;

[0088] In the bending strength determination module, the calculation formula of the transverse joint bending stiffness is expressed as:

[0089]

[0090] Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2 ); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

[0091] In a third aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the program is configured to execute the method for determining the bending stiffness of transverse joints of upper and lower block prefabricated box culverts as described in any one of the first aspects.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the bending stiffness of the transverse joints of upper and lower prefabricated box culverts, characterized in that: The steps include: Determine the combination type of transverse joints of upper and lower prefabricated box culverts; According to the joint combination type, the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joint are determined respectively; Calculate the maximum internal force value M of the bending moment generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ; The maximum joint rotation angle θ of the transverse joint of the prefabricated box culvert under the action of external force is calculated using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ. The bending stiffness of the transverse joints of the upper and lower prefabricated box culverts is calculated using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

2. The method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 1 is characterized in that: The maximum bending moment internal force value M is expressed by the formula: M=0.5f py A p b; The maximum seam angle value θ is expressed by the formula: θ=βλ+θ0; The ratio of steel section strength to concrete section strength λ is expressed by the formula: λ=f py A p / f c bl; The calculation formula of transverse joint bending stiffness is expressed as: Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2 ); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

3. The method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 2 is characterized in that: The joint combination types include socket type + bent bolts, socket type + precision-rolled threaded steel bars, and flat type + precision-rolled threaded steel bars.

4. The method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 3 is characterized in that: For the joint combination type of socket type + bent bolt, the correction coefficient α is 0.14, for the socket type + precision-rolled threaded steel bar, the correction coefficient α is 0.215, and for the flat type + precision-rolled threaded steel bar, the correction coefficient α is 0.224; For the joint combination type of socket type + bent bolt, the correction coefficient β is 0.27, for the socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14, for the flat type + precision rolled threaded steel bar, the correction coefficient β is 0.155; For the joint combination type of socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, for the socket type + precision-rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, for the flat type + precision-rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad; For the joint combination type of socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, for the socket type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, and for the flat type + finished rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

5. A system for determining the bending stiffness of transverse joints of upper and lower prefabricated box culverts, characterized in that: Includes the following modules: The initial parameter module is used to determine the combination type of the transverse joints of the upper and lower prefabricated box culverts; and determine the correction coefficients α, β, initial stiffness K0 and initial joint angle value θ0 corresponding to the transverse joints according to the joint combination type; The first calculation module is used to calculate the maximum bending moment internal force value M generated by the transverse joint of the prefabricated box culvert under the action of external force, and calculate the ratio of the steel section strength to the concrete section strength λ; The second calculation module is used to calculate the maximum joint rotation angle θ generated by the transverse joint of the prefabricated box culvert under the action of external force by using the correction coefficient β, the initial joint rotation angle θ0 and the strength ratio λ; The bending strength determination module is used to calculate the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts using the correction coefficient α, initial stiffness K0, maximum bending moment internal force value M and maximum joint rotation angle value θ.

6. The method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 5 is characterized in that: The joint combination types are divided into three types: socket type + bent bolts, socket type + precision-rolled threaded steel bars, and flat type + precision-rolled threaded steel bars.

7. The method for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 6 is characterized in that: If the joint combination type is socket type + bent bolt, the correction coefficient α is 0.14; if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient α is 0.215; if the joint combination type is plain type + precision rolled threaded steel bar, the correction coefficient α is 0.224; If the joint combination type is socket type + bent bolt, the correction coefficient β is 0.27; if the joint combination type is socket type + precision rolled threaded steel bar, the correction coefficient β is 0.14; if the joint combination type is plain type + precision rolled threaded steel bar, the correction coefficient β is 0.155; If the joint combination type is socket type + bent bolt, the initial stiffness K0 is 10KN·m / rad, if the joint combination type is socket type + precision rolled threaded steel bar, the initial stiffness K0 is 80KN·m / rad, if the joint combination type is flat type + precision rolled threaded steel bar, the initial stiffness K0 is 120KN·m / rad; If the joint combination type is socket type + bent bolt, the initial joint angle value θ0 is 0.06rad, the joint combination type is socket type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.0617rad, and the joint combination type is flat type + precision-rolled threaded steel bar, the initial joint angle value θ0 is 0.062rad.

8. The system for determining the bending stiffness of the transverse joints of the upper and lower prefabricated box culverts according to claim 7 is characterized in that: The maximum bending moment internal force value M is expressed by the formula: M=0.5f py A p b; The maximum seam angle value θ is expressed by the formula: θ=βλ+θ0; The ratio of steel section strength to concrete section strength λ is expressed by the formula: λ=f py A p / f c bl; The calculation formula of transverse joint bending stiffness is expressed as: Where M is the maximum bending moment internal force value generated by the transverse joint of the prefabricated box culvert under the action of external force; θ is the maximum joint rotation angle value generated by the transverse joint of the prefabricated box culvert under the action of external force; λ is the ratio of the steel section strength to the concrete section strength; f py is the tensile strength design value of the joint connector (N / mm 2 );A p is the cross-sectional area of ​​the joint connector (mm 2 ); b is the thickness of the component (mm); f c is the design value of concrete compressive strength (N / mm 2 ); l is the width of the component (mm); α, β are correction coefficients; K0, θ0 are the initial stiffness and initial joint rotation angle values.

9. A computer-readable storage medium, characterized in that: The medium stores a computer program, which is configured to execute the method for determining the bending stiffness of the transverse joints of the upper and lower block prefabricated box culverts as described in any one of claims 1 to 4.

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