Design method for connecting structure of combined aqueduct with steel truss beam and corrugated water trough

Abstract

The invention discloses a design method for the connection structure of a steel truss beam and a corrugated water trough combined aqueduct, belonging to the technical field of steel structure aqueducts. Based on the functional requirements, the overall structure of the connection structure of the steel truss beam and the corrugated water trough combined aqueduct is designed, and the design and calculation formulas for the height of each force-bearing part of the partition board are established, improving the refinement and design efficiency of the design; based on the principle of the overall structure and separate force-bearing, the force-bearing and stiffness calculation models of the partition board of the connection structure of the steel truss beam and the corrugated water trough combined aqueduct are constructed, and the design thickness calculation formula of the partition board of the connection structure is provided, providing a convenient and fast design method for the connection structure of the steel beam and the corrugated trough combined aqueduct; considering the influence of the opening of the partition board structure of the connection structure on the stiffness calculation, the calculation result of the stiffness calculation model of the partition board is closer to the true force-bearing state of the structure, improving the reliability of the design.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure aqueducts, and in particular to a design method for a steel truss beam and a corrugated water channel combined aqueduct connection structure. Background Art

[0002] Aqueducts are an indispensable part of water conservancy projects. They can effectively cross cross structures and achieve effective regulation of water resources between different regions, playing an irreplaceable role in social development. With the rapid development of the economy and the growth of regional population, the uneven demand for water resources has become increasingly obvious. In this context, steel structure aqueducts are favored by concrete aqueducts due to their significant advantages such as high material strength, light weight, strong spanning capacity, and outstanding terrain adaptability.

[0003] Traditional aqueduct design usually adopts the method of separating the flume from the lower structure (load-bearing structure, foundation, etc.), and realizes the force transmission, stability and functional requirements of the structure through the support connection. The flume mainly undertakes the water transmission function, and the lower structure is mainly responsible for supporting the flume and transferring the load to the foundation. The two are connected by the support. However, with the increase in the demand for water conservancy projects, the span and flow of the aqueduct are getting larger and larger. The traditional aqueduct design adopts a separated structure with a large height and large investment, and its economy is difficult to meet the needs of modern water conservancy projects. By adopting a steel truss beam and a zigzag flume combined structure, the bearing capacity, overall stiffness, stability and economy of the structure can be greatly improved.

[0004] However, as a combined steel structure aqueduct with both stress-bearing and water-transporting functions, its connection structure design and calculation methods are still imperfect in the existing technology. As the main load-bearing structure of the aqueduct, the steel truss beam has a strong bearing capacity. As a water flow channel, the ripple flume can make full use of its ripple folds to increase the longitudinal and lateral stiffness of the structure. Especially under large spans or high water pressure conditions, the ripple structure can effectively release the uncoordinated deformation internal force caused by the temperature difference between the water body and the structure, reduce the impact of temperature changes on the structure, and thus extend the service life. When the two are connected as a whole, the structure of the steel truss beam and the ripple flume usually adopts a fully welded truss beam-arch combination system with outer trusses and inner waves. The connection of this structural system needs to consider the spatial stress characteristics of the vertical bars, diagonal bars and ripple flumes of the steel truss beams, the coordinated deformation capacity, and the stress concentration caused by the fully welded structure, dense nodes and complex connections. Therefore, it is difficult for traditional design and calculation methods to accurately simulate its stress state and deformation characteristics. This greatly restricts the development of combined steel structure aqueducts, and it is urgent to propose a design method for the connection structure of a combined aqueduct with an integral structure and separated stress-bearing steel truss beams and a corrugated flume. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to solve the deficiencies existing in the traditional design method, and propose a design method for the connecting structure of a steel truss beam and a corrugated water trough combined aqueduct, which can not only connect the steel truss beam and the corrugated water trough into a whole in structure, but also ensure that they are independently stressed and do not interfere with each other.

[0006] The present invention solves the above technical problem through the following technical solutions. The present invention includes the following steps:

[0007] Step S1: Design the overall structure of the connecting structure of the steel truss beam and the corrugated water trough combined aqueduct based on the functional requirements, where the connecting structure includes a partition board and a T-shaped stiffening rib;

[0008] Step S2: Construct a mechanical calculation model of the connecting structure based on the overall structure and the principle of separate stress, and determine the stressed thickness of the partition board , and determine the design thickness of the T-shaped stiffening rib based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water trough due to temperature shrinkage ;

[0009] Step S3: Assume that the partition board undergoes plastic failure after the corrugated water trough, and consider the influence of the openings in the partition board structure on the stiffness calculation, construct a stiffness calculation model of the partition board, and determine the stiffness thickness of the partition board ;

[0010] Step S4: Based on the mechanical and stiffness calculation models of the partition board, determine the design thickness of the partition board , and then complete the design of the connecting structure.

[0011] Furthermore, in the step S1, the connecting structure is located between the steel truss beam and the corrugated water trough, with the steel truss beam on the outside as the load-bearing structure and the corrugated water trough on the inside as the water conveyance structure.

[0012] Furthermore, in the step S1, the process of designing the overall structure of the connecting structure is as follows:

[0013] Step S11: For the longitudinal design of the connecting structure, along the water conveyance direction of the aqueduct, based on the overall structure and the principle of separate stress, taking into account the requirements of load transfer and deformation coordination, a partition board is vertically arranged at each wave crest and wave trough of the corrugated water trough at intervals of a set multiple of the corrugated water trough wavelength, connecting the steel truss beam on the outside and the corrugated water trough on the inside into a whole; at the same time, between two partition boards, along the longitudinal direction of the corrugated water trough, a T-shaped stiffening rib is respectively arranged along the wave crest, wave trough and hypotenuse of each waveform unit of the corrugated water trough;

[0014] Step S12: For the horizontal design of the connection structure, based on the functional requirements of the power pipeline crossing the bridge, at least one round hole is provided on the upper part of the partition board. Based on the functional requirements of maintenance and inspection for people to pass through, a maintenance hole is provided on the lower part of the connection structure. At the same time, considering the load transfer requirements under different water depth conditions, the spatial distribution of each part of the partition board is comprehensively determined.

[0015] Step S13: For the vertical design of the connection structure, a plurality of T-shaped stiffening ribs are respectively provided along the top and bottom of the corrugated water trough, and the T-shaped stiffening ribs provided at the top and bottom of the corrugated water trough correspond to each other one by one.

[0016] Furthermore, in the said Step S2, the process of constructing the force calculation model of the partition board is as follows:

[0017] Step S21: Based on the structural force, it is assumed that the round hole, the maintenance hole and the area around the hole do not participate in the structural force. The partition board is divided into four parts along the height direction, which are defined as Force-bearing Part One, Force-bearing Part Two, Force-bearing Part Three and Force-bearing Part Four from top to bottom. Among them, the heights of Force-bearing Part One, Force-bearing Part Two, Force-bearing Part Three and Force-bearing Part Four are 、 、 and respectively, and 、 、 and are determined according to the following formula:

[0018] ;

[0019] ;

[0020] ;

[0021] ;

[0022] Among them, is the first layering coefficient, is the second layering coefficient, is the third layering coefficient, is the total height of the partition board, is the diameter of the round hole, is the height of the maintenance hole;

[0023] Step S22: The force-bearing thickness takes the maximum value among the four water conveyance working conditions of the aqueduct structure.

[0024] ​​Furthermore, in the step S21, the number of circular holes is two. The first force-bearing part is located above the first circular hole, the second force-bearing part is located between the first circular hole and the second circular hole, the third force-bearing part is located between the second circular hole and the maintenance hole, and the fourth force-bearing part is located below the maintenance hole.

[0025] Furthermore, in the step S22, the calculation method of the force-bearing thickness of the partition in the four water conveyance working conditions of the aqueduct structure is as follows:

[0026] Working condition 1: When the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the third force-bearing part in the partition, it is assumed that all the loads borne by the corrugated water trough are transmitted by the fourth force-bearing part, then:

[0027] ;

[0028] Wherein, is the importance coefficient of the aqueduct structure, is the unit weight of water, is the design value of the compressive strength of the partition steel, is the width of the partition, is the longitudinal spacing of the partition;

[0029] Working condition 2: When the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the second force-bearing part and above the bottom surface of the third force-bearing part in the partition, it is assumed that the loads borne by the corrugated water trough are jointly transmitted by the third force-bearing part and the fourth force-bearing part, then:

[0030] ;

[0031] Working condition 3: When the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the first force-bearing part and above the bottom surface of the second force-bearing part in the partition, it is assumed that the loads borne by the corrugated water trough are jointly transmitted by the second force-bearing part, the third force-bearing part and the fourth force-bearing part, then:

[0032] ;

[0033] Working condition 4: When the water flow height in the water conveyance working condition of the aqueduct structure is below the top surface of the partition and above the bottom surface of the first force-bearing part, at this time, the loads borne by the corrugated water trough are jointly transmitted by the first force-bearing part, the second force-bearing part, the third force-bearing part and the fourth force-bearing part, then:

[0034] ;

[0035] Wherein, is the design value of the shear strength of the partition steel.

[0036] Furthermore, in the step S2, the process of constructing the force-bearing calculation model of the T-shaped stiffener is as follows:

[0037] Based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated flume due to temperature shrinkage, that is, the load caused by temperature shrinkage of the corrugated flume between two adjacent partitions is borne by the T-shaped stiffeners arranged at the bottom of the partitions;

[0038] Furthermore, determine the design thickness of the T-shaped stiffeners ;

[0039] ;

[0040] Among them, The value of is 2030 - 2731, is the linear expansion coefficient of the corrugated flume, is the average temperature difference gradient of the area where the corrugated flume is located, is the elastic modulus of the corrugated flume, is the thickness of the corrugated flume, is the number of T-shaped stiffeners arranged at the bottom of the partitions between two adjacent partitions, is the wavelength of the corrugated flume, is the web size of the T-shaped stiffener, is the flange size of the T-shaped stiffener.

[0041] Furthermore, in the step S3, the stiffness thickness of the partition is determined according to the following formula:

[0042] ;

[0043] Among them, The value of is 0.033 - 0.047, is the longitudinal spacing of the partitions, is the unfolded length of one wavelength of the corrugated flume, is the elastic modulus of the partition, is the width of the maintenance hole.

[0044] Furthermore, in the step S4, the design thickness of the partition is determined according to the following formula:

[0045] ;

[0046] The present invention has the following advantages compared with the prior art:

[0047] 1. Based on the functional requirements, the overall structure of the combined aqueduct connection structure of the steel truss beam and the corrugated flume is designed, and the design and calculation formulas for the height of each force distribution of the partition are established, improving the design refinement and design efficiency.

[0048] 2. Based on the overall structure and the principle of separate force-bearing, the present invention constructs a force-bearing and stiffness calculation model for the partition of the combined aqueduct connection structure of a steel truss beam and a corrugated water trough, provides a calculation formula for the design thickness of the partition of the connection structure, and provides a convenient and fast design method for the combined aqueduct connection structure of a steel beam and a corrugated trough.

[0049] 3. Based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water trough due to temperature shrinkage, the present invention provides a calculation formula for the design thickness of the T-shaped stiffener of the connection structure.

[0050] 4. The present invention considers the influence of the structural openings of the partition of the connection structure on the stiffness calculation, making the calculation result of the partition stiffness calculation model closer to the actual force-bearing state of the structure and improving the reliability of the design.

[0051] 5. The structure has strong integrity. The partition and T-shaped stiffener designed in the present invention take into account the requirements of transferring loads and coordinating deformations, reducing the influence of additional stresses and secondary stresses inside the steel truss beam on the corrugated water trough, improving the local stress concentration caused by the all-welded structure of the corrugated water trough, and coordinating the longitudinal deformation of the corrugated water trough caused by temperature shrinkage, thereby improving the bearing capacity, stability and integrity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a schematic flow chart of the design method for the combined aqueduct connection structure of a steel beam and a corrugated trough in an embodiment of the present invention;

[0053] Figure 2 is a schematic cross-sectional view of the aqueduct structure in an embodiment of the present invention;

[0054] Figure 3 is a schematic longitudinal structure diagram (top view) of the connection structure on one side in an embodiment of the present invention;

[0055] Figure 4 is a force-bearing calculation model diagram of the partition designed in an embodiment of the present invention;

[0056] Figure 5 is a schematic diagram of the partition structure designed in an embodiment of the present invention;

[0057] In the figure, 1 - partition; 101 - force-bearing part (force-bearing part one); 102 - force-bearing part (force-bearing part two); 103 - force-bearing part (force-bearing part three); 104 - force-bearing part (force-bearing part four); 106 - round hole; 107 - maintenance hole; 108 - transverse stiffener; 2 - steel truss beam; 3 - corrugated water trough; 4 - T-shaped stiffener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] The embodiments of the present invention will be described in detail below. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0059] Embodiment 1

[0060] As Figures 1 to 5 shown, this embodiment provides a technical solution: a design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough, including the following steps:

[0061] Step S1: Design the overall structure of the connection structure of the combined aqueduct of the steel truss beam and the corrugated water trough based on functional requirements;

[0062] The steps for designing the overall structure are as follows:

[0063] Based on the overall design, the connection structure is located between the steel truss beam 2 and the corrugated water trough 3. Its outer side is the load-bearing structure of the steel truss beam 2, and its inner side is the corrugated water trough 3, serving as a water conveyance structure. The connection structure includes two types: a partition plate 1 and a T-shaped stiffening rib 4.

[0064] In this embodiment, for the longitudinal design of the connection structure, that is, along the water conveyance direction of the aqueduct, based on the principle of the overall structure and separate force-bearing, the requirements of load transfer and deformation coordination are taken into account. First, considering the structural shape of the corrugated water trough 3, for the convenience of installation and connection, a partition plate 1 is arranged at every 2 or 3 integer multiples of the wavelength along the wave peaks and wave valleys of the corrugated water trough 3, connecting the outer steel truss beam 2 and the inner corrugated water trough 3 into a whole, transferring the load and allowing a certain contraction deformation space for the corrugated water trough 3. At the same time, between two partition plates 1, T-shaped stiffening ribs 4 are arranged in the connection structure to reduce the influence of the internal additional stress and secondary stress of the steel truss beam 2 on the corrugated water trough 3, and to improve the stress concentration of the all-welded structure. Along the longitudinal direction of the corrugated water trough 3, a T-shaped stiffening rib 4 is arranged respectively along the wave peaks, wave valleys and hypotenuses of the corrugated water trough waveform unit.

[0065] In this embodiment, for the transverse design of the connection structure, based on the functional requirement of the power pipeline crossing the aqueduct structure of the aqueduct, 1 to 2 round holes 106 should be provided in the upper part of the partition plate 1, and the diameter of the round holes 106 d takes a value of 800 mm. Based on the functional requirement of maintenance and inspection for people to pass through, 1 maintenance hole 107 should be provided in the lower part of the partition plate 1. Considering the human body shape, it can be set as a rectangular hole, and the height of the maintenance hole 107 takes a value of 2550 mm. At the same time, considering the load transfer requirements under different water depth conditions, the spatial distribution of each part of the partition plate 1 is comprehensively determined.

[0066] In this embodiment, for the vertical design of the connection structure, a plurality of T-shaped stiffeners 4 are arranged along the top and bottom of the corrugated water trough 3 respectively, and the T-shaped stiffeners 4 arranged at the top and bottom of the corrugated water trough 3 correspond to each other to improve the stress concentration of the all-welded structure.

[0067] The detailed calculation parameters are shown in Table 1.

[0068] Step S2: Based on the overall structure and the principle of separate force bearing, construct a force calculation model for the combined aqueduct connection structure of the steel truss beam 2 and the corrugated water trough 3, and determine the force-bearing thickness of the partition plate 1 in the connection structure , and based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water trough 3 due to temperature shrinkage, determine the design thickness of the T-shaped stiffener 4 in the connection structure ;

[0069] (1) The steps for constructing the force calculation model of the partition plate 1 are as follows:

[0070] In this embodiment, based on the structural force, it is assumed that the circular holes 106, maintenance holes 107 and the surrounding areas of the holes of the partition plate 1 do not participate in the structural force. Then, the partition plate 1 is divided into four parts along the height direction, which are defined as the force-bearing part 101, force-bearing part 102, force-bearing part 103 and force-bearing part 104 from top to bottom. Among them, the heights of the force-bearing part 101, force-bearing part 102, force-bearing part 103 and force-bearing part 104 are , , and , respectively, and , , and are determined by the following formula:

[0071] ;

[0072] ;

[0073] ;

[0074] ;

[0075] Among them, is the first layer coefficient, takes a value of 0.2 - 0.25 and , is the second layer coefficient, The value ranges from 0.07 to 0.14 and , is the layering coefficient three, the value ranges from 0.04 to 0.07 and , , is the total height of the corrugated water trough 2 (i.e., the total height of the partition 1), is the diameter of the round hole 106, is the height of the maintenance hole 107; the specific parameters are shown in Table 1.

[0076] The stressed thickness of the partition 1 in the connection structure is determined by taking the maximum value among the following four working conditions:

[0077] (1.1) As Figure 4 shown, when the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the stressed part 103 of the partition 1, assuming that all the loads on the corrugated water trough 3 are transmitted by the stressed part 104, then:

[0078] = 5.54 mm;

[0079] Among them, is the importance coefficient of the aqueduct structure, taking 0.9, 1.0 or 1.1, is the unit weight of water, is the design value of the compressive strength of the steel of the partition 1, is the width of the partition 1, is the longitudinal spacing of the partition 1.

[0080] (1.2) As Figure 4 shown, when the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the stressed part 102 of the partition 1 and above the bottom surface of the stressed part 103, assuming that the loads on the corrugated water trough 3 are transmitted jointly by the stressed part 103 and the stressed part 104, then:

[0081] = 6.55 mm;

[0082] (1.3) As Figure 4 shown, when the water flow height in the water conveyance working condition of the aqueduct structure is below the bottom surface of the stressed part 101 of the partition 1 and above the bottom surface of the stressed part 102, assuming that the loads on the corrugated water trough 3 are transmitted by the stressed part 102, the stressed part 103, the stressed If it is jointly transmitted by part 104, then:

[0083] = 6.81 mm;

[0084] (1.4) As Figure 4 shown, when the water flow height in the water conveyance condition of the aqueduct structure is below the top surface of the partition 1 and above the bottom surface of the force-bearing part 101, at this time, the load borne by the corrugated water trough 3 is jointly transmitted by the force-bearing part 101, the force-bearing part 102, the force-bearing part 103, and the force-bearing part 104. Then:

[0085] = 15.34 mm;

[0086] Among them, is the design shear strength value of the steel of the partition 1.

[0087] (2) The steps for constructing the force calculation model of the T-shaped stiffener 4 and calculating the design thickness of the T-shaped stiffener are as follows:

[0088] Based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water trough 3 due to temperature shrinkage, that is, the load caused by the temperature shrinkage of the corrugated water trough 3 between two adjacent partitions 1 (see Figure 3 ) is borne by the T-shaped stiffener 4 arranged at the bottom of the partition;

[0089] Furthermore, determine the design thickness of the T-shaped stiffener 4, which is determined by the following formula;

[0090] = 10.88 mm;

[0091] Therefore, the design thickness of the T-shaped stiffener 4 is taken as 12 mm.

[0092] Among them, takes values from 2030 to 2731, is the linear expansion coefficient of the corrugated water trough 3, is the average value of the temperature difference gradient in the area where the corrugated water trough 3 is located, is the elastic modulus of the corrugated water trough 3, is the thickness of the corrugated water trough 3, is the number of T-shaped stiffeners 4 arranged at the bottom of the partition 1 between two adjacent partitions 1 (when the longitudinal distance between two adjacent partitions 1 is 2 times the wavelength of the corrugated water trough 3, takes 7, and when the longitudinal distance between the two partitions 1 is 3 times the wavelength of the corrugated water trough 3, takes 11), is the wavelength of the corrugated water tank 3, is the web size of the T-shaped stiffener 4, is the flange size of the T-shaped stiffener 4.

[0093] Step S3: Assume that the diaphragm 1 undergoes plastic failure after the corrugated water tank 3, and consider the influence of the structural opening of the diaphragm 1 on the stiffness calculation. Construct a stiffness calculation model for the diaphragm 1 to determine the stiffness thickness of the diaphragm 1 ;

[0094] The stiffness thickness of the diaphragm 1 is determined by the following formula:

[0095] = 14.09 mm;

[0096] where, takes values from 0.033 to 0.047, is the longitudinal spacing of the diaphragm 1, is the developed length of one wavelength of the corrugated water tank 3, is the elastic modulus of the diaphragm 1, is the width of the maintenance hole 107;

[0097] Step S4: Based on the force and stiffness calculation models of the diaphragm 1, determine the design thickness of the diaphragm 1 , thereby completing the design of the connection structure;

[0098] The design thickness of the diaphragm 1 is determined by the following formula:

[0099] = 15.34 mm;

[0100] Therefore, the design thickness of the diaphragm 1 in this embodiment can be taken as 16 mm.

[0101] In this embodiment, the detailed calculation parameters involved are shown in Table 1.

[0102] Table 1 Detailed calculation parameters

[0103]

[0104] In summary, as can be seen from this embodiment, the present invention designs the overall structure of the combined aqueduct connection structure of the steel truss beam and the corrugated water tank based on functional requirements, establishes the design and calculation formula for the height of each force-bearing part of the partition board, and improves the refinement and design efficiency of the design; based on the overall structure and the principle of separate force-bearing, a force-bearing and stiffness calculation model for the partition board in the combined aqueduct connection structure of the steel truss beam and the corrugated water tank is constructed, provides the design thickness calculation formula for the partition board, and provides a convenient and fast design method for the combined aqueduct connection structure of the steel beam and the corrugated tank; based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water tank due to temperature shrinkage, provides the design thickness calculation formula for the T-shaped stiffening rib; the present invention considers the influence of the opening of the partition board structure on the stiffness calculation, makes the calculation result of the partition board stiffness calculation model closer to the true force-bearing state of the structure, and improves the reliability of the design; the structure has strong integrity. The partition board and T-shaped stiffening rib designed by the present invention take into account the requirements of transferring loads and coordinating deformations, reduce the influence of internal additional stress and secondary stress in the steel truss beam on the corrugated water tank, improve the local stress concentration caused by the all-welded structure of the corrugated water tank, and coordinate the longitudinal deformation of the corrugated water tank caused by temperature shrinkage, thereby improving the bearing capacity, stability and integrity of the structure.

[0105] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough, characterized in that, Including the following steps: Step S1: Design the overall structure of the combined aqueduct connection structure of the steel truss beam and the corrugated water trough based on the functional requirements. The connection structure includes a partition board and a T-shaped stiffening rib; Step S2: Based on the overall structure and the principle of separated forces, construct a force calculation model for the connection structure to determine the force-bearing thickness of the partition board , based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water tank due to temperature shrinkage, determine the design thickness of the T-shaped stiffening rib ; Step S3: Assume that the partition fails plastically after the corrugated water tank, and considering the influence of the openings in the partition structure on the stiffness calculation, construct a stiffness calculation model for the partition and determine the stiffness thickness of the partition ; Step S4: Determine the designed thickness of the partition based on the force and stiffness calculation models of the partition, and thus complete the design of the connection structure.

2. The design method of a combined aqueduct connection structure of a steel truss beam and a corrugated water trough according to claim 1, characterized in that In the said step S1, the connection structure is located between the steel truss beam and the corrugated water trough. The outer side is the steel truss beam, serving as the load-bearing structure, and the inner side is the corrugated water trough, serving as the water conveyance structure.

3. A design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough according to claim 1, characterized in that, In the said step S1, the design process of the overall structure of the connection structure is as follows: Step S11: For the longitudinal design of the connection structure, along the water conveyance direction of the aqueduct, based on the principle of overall structure and separate force-bearing, taking into account the requirements of load transfer and deformation coordination, along the wave crests and wave troughs of the corrugated water trough, a partition board is vertically arranged at every certain multiple of the wavelength of the corrugated water trough, connecting the outer steel truss beam and the inner corrugated water trough into a whole; meanwhile, between two partition boards, along the longitudinal direction of the corrugated water trough, a T-shaped stiffening rib is respectively arranged along the wave crests, wave troughs and hypotenuses of each waveform unit of the corrugated water trough; Step S12: For the transverse design of the connection structure, based on the functional requirements of the power pipeline crossing the bridge, at least one round hole is arranged on the upper part of the partition board. Based on the functional requirements of maintenance and inspection for people to pass through, a maintenance hole is arranged at the lower part of the connection structure. At the same time, considering the load transfer requirements under different water depth conditions, the spatial distribution of each part of the partition board is comprehensively determined; Step S13: For the vertical design of the connection structure, multiple T-shaped stiffening ribs are respectively arranged along the top and bottom of the corrugated water trough, and the T-shaped stiffening ribs arranged at the top and bottom of the corrugated water trough correspond to each other one by one.

4. A design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough according to claim 3, characterized in that, In the said step S2, the process of constructing the force calculation model of the partition board is as follows: Step S21: Based on the structural stress, it is assumed that the circular holes, maintenance holes, and the areas around the holes do not participate in the structural stress. The partition is divided into four parts along the height direction, which are defined as the first stressed part, the second stressed part, the third stressed part, and the fourth stressed part from top to bottom. Among them, the heights of the first stressed part, the second stressed part, the third stressed part, and the fourth stressed part are , , and , and , , and are determined according to the following formula: ； ； ； ； Among them, is the first stratification coefficient, is the second stratification coefficient, is the third stratification coefficient, is the total height of the partition board, is the diameter of the round hole, is the height of the maintenance hole; Step S22: The stressed thickness of the partition board Take the maximum value among the four water conveyance conditions of the aqueduct structure.

5. A design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough according to claim 4, characterized in that, In the said step S21, the number of round holes is two. The first force-bearing part is above the first round hole, the second force-bearing part is between the first round hole and the second round hole, the third force-bearing part is between the second round hole and the maintenance hole, and the fourth force-bearing part is below the maintenance hole.

6. The design method of a combined aqueduct connection structure of a steel truss beam and a corrugated water trough according to claim 5, characterized in that In the step S22, the stressed thickness of the partition board under the four water conveyance conditions of the aqueduct structure is calculated as follows: Condition 1: When the water flow height in the water conveyance condition of the aqueduct structure is below the bottom surface of the three stressed parts in the partition board, it is assumed that all the loads on the corrugated water channel are transmitted by the four stressed parts. Then: ; Among them, is the importance coefficient of the aqueduct structure, is the unit weight of water, is the design value of the compressive strength of the partition steel, is the longitudinal spacing of the partitions; Condition 2: When the water flow height in the water transportation condition of the aqueduct structure is below the bottom surface of the second stressed part and above the bottom surface of the third stressed part of the partition, assuming that the load on the corrugated water trough is jointly transmitted by the third stressed part and the fourth stressed part, then: ; Working condition three: When the water flow height in the aqueduct structure during the water transportation condition is below the bottom surface of the first force-bearing part and above the bottom surface of the second force-bearing part of the partition board, assuming that the load on the corrugated water trough is jointly transmitted by the second force-bearing part, the third force-bearing part, and the fourth force-bearing part, then: ; Working condition 4: When the water flow height in the water conveyance condition of the aqueduct structure is below the top surface of the partition and above the bottom surface of the first force-bearing part, at this time, the load on the corrugated water trough is jointly transmitted by the first force-bearing part, the second force-bearing part, the third force-bearing part, and the fourth force-bearing part, then: ; Among them, is the width of the partition board, is the design shear strength value of the partition board steel.

7. A design method for the connection structure of a combined aqueduct of a steel truss beam and a corrugated water trough according to claim 6, characterized in that, In the said step S2, the process of constructing the force calculation model of the T-shaped stiffening rib is as follows: Based on the principle of horizontal force balance caused by the longitudinal deformation of the corrugated water trough due to temperature shrinkage, that is, the load caused by the temperature shrinkage of the corrugated water trough between two adjacent partition boards is borne by the T-shaped stiffening ribs arranged at the bottom of the partition board; Furthermore, determine the design thickness of the T-shaped stiffener : ; Among them, takes values from 2030 to 2731, is the linear expansion coefficient of the corrugated water tank, is the average temperature difference gradient of the area where the corrugated water tank is located, is the elastic modulus of the corrugated water tank, is the thickness of the corrugated water tank, is the number of T-shaped stiffeners arranged at the bottom of the partition between two adjacent partitions, is the wavelength of the corrugated water tank, is the web size of the T-shaped stiffener, is the flange size of the T-shaped stiffener.

8. A design method for the connection structure of a steel truss beam and a corrugated water trough combined aqueduct according to claim 7, characterized in that, In the step S3, the stiffness thickness of the partition board is determined by the following formula: ； Among them, takes values from 0.033 to 0.047, is the longitudinal spacing of the partition, is the unfolded length of one wavelength of the corrugated water trough, is the elastic modulus of the partition, is the width of the maintenance hole.

9. The design method of a combined aqueduct connection structure between a steel truss beam and a corrugated water trough according to claim 8, characterized in that, In the step S4, the designed thickness of the partition board is determined according to the following formula: .

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