Stiff skeleton concrete arch bridge cross brace, arch bridge and design method

Abstract

The invention relates to the technical field of bridge engineering, in particular to a stiff skeleton concrete arch bridge cross brace, an arch bridge and a design method. The stiff skeleton concrete arch bridge cross brace comprises a cross brace upper flange, a cross brace web and a cross brace lower flange which are connected in sequence. Each of the cross brace upper flange, the cross brace web and the cross brace lower flange comprises a cross brace framework and concrete, the cross brace frameworks are used for being connected with an arch rib frame, and the cross brace frameworks are coated with the concrete; and the width of the cross brace upper flange is greater than that of the cross brace lower flange. It can be judged through calculation of various different parameter models, compared with a traditional cross brace structure, the arch bridge cross brace can more effectively improve the lateral stability of an arch bridge, and better economical efficiency is achieved. In addition, a calculation result shows that the width of the upper side of the cross brace is more sensitive to the influence of the lower side on the lateral stability, and therefore the cross brace is arranged to be in a mode of being wide in the upper portion and narrow in the lower portion.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a rigid skeleton concrete arch bridge cross brace, an arch bridge and a design method. Background Art

[0002] As a compression-bending structure, the stability of an arch bridge is the main factor restricting the development of its span. Vertical stability is usually achieved by increasing the height of the arch ribs and reducing their deadweight. Lateral stability is achieved by limiting the width-to-span ratio and increasing the cross braces between the arch ribs. The specification requires that the width-to-span ratio can be 1 / 20L to ensure lateral stability, where L is the calculated span of the arch bridge. However, it is difficult to meet this width-to-span ratio requirement for large-span arch bridges, so cross braces are required to meet the requirements for lateral stability.

[0003] Commonly used cross braces include X-shaped cross braces, K-shaped cross braces, and straight cross braces, etc. However, the rigidity of these cross braces is relatively small and cannot meet the requirements of lateral stability of long-span arch bridges. Summary of the invention

[0004] The purpose of the present invention is to overcome the technical problem in the prior art that the lateral stability of a long-span arch bridge cannot be satisfied, and to provide a rigid skeleton concrete arch bridge cross brace, an arch bridge and a design method.

[0005] In a first aspect, the present invention provides a rigid skeleton concrete arch bridge cross brace, comprising a cross brace upper flange, a cross brace web and a cross brace lower flange connected in sequence;

[0006] The upper flange of the cross brace, the web of the cross brace and the lower flange of the cross brace all include a cross brace frame and concrete, the cross brace frame is used to connect with the arch rib frame, and the concrete is coated outside the cross brace frame;

[0007] The width of the upper flange of the cross brace is greater than the width of the lower flange of the cross brace.

[0008] Preferably, the average width of the upper flange of the cross brace is determined by the following formula:

[0009] hcs=L / 100+△, where: hcs is the average width of the upper flange of the cross brace, L is the calculated span of the arch bridge, and △ is the corrected width;

[0010] The average width of the lower flange of the cross brace is determined by the following formula:

[0011] hcx=hcs / 2, where: hcx is the average width of the lower flange of the cross brace;

[0012] The height of the cross brace web is adapted to the height of the arch rib.

[0013] Preferably, the cross-sectional shapes of the upper flange of the cross brace and the lower flange of the cross brace are both rectangular, and the average width of the upper flange of the cross brace and the lower flange of the cross brace is the width of the rectangle.

[0014] Preferably, the upper flange of the cross brace includes a first region, a second region and a third region connected in sequence along its length direction, the second region is set to have equal width, the widths of the first region and the third region increase continuously or discontinuously from the second region, respectively, and the average width of the upper flange of the cross brace is the average width of the first region, the second region and the third region.

[0015] Preferably, the cross-sectional shape of the second region is rectangular, and the cross-sectional shapes of the first region and the third region are isosceles trapezoidal.

[0016] Preferably, the cross bracing frame is used for welding connection with the arch rib frame.

[0017] In a second aspect, the present invention provides an arch bridge, comprising at least two arch ribs and a plurality of arch bridge cross braces, wherein two ends of the arch bridge cross braces are respectively connected to two adjacent arch ribs, and the cross brace skeleton is connected to the arch rib skeleton and concrete is cast together.

[0018] Preferably, the cross brace spacing of the arch bridge cross braces is 1 / 17 to 1 / 12 of the calculated span of the arch bridge.

[0019] Preferably, the cross brace spacing of the arch bridge cross braces is consistent with the building position on the arch.

[0020] In a third aspect, the present invention provides an arch bridge design method for designing a cross brace of the arch bridge, comprising the steps of:

[0021] S1: Select multiple influencing factors and conduct orthogonal experiments;

[0022] S2: Conduct multi-factor variance analysis of arch bridge orthogonal test to obtain sensitive influencing factors;

[0023] S3: The width of the upper flange of the cross brace is determined by the following formula:

[0024] hcs=L / 100+△, where: hcs is the width of the upper flange of the cross brace, L is the calculated span of the arch bridge, and △ is the corrected width;

[0025] The average width of the lower flange of the cross brace is determined by the following formula:

[0026] hcx=hcs / 2, where: hcx is the average width of the lower flange of the cross brace;

[0027] The height of the cross brace web is adapted to the height of the arch rib.

[0028] Preferably, the cross brace spacing of the arch bridge cross braces is 1 / 17 to 1 / 12 of the calculated span of the arch bridge.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention provides a rigid skeleton concrete arch bridge cross brace, which can more effectively improve the lateral stability of the arch bridge by sequentially connecting the cross brace upper flange, the cross brace web and the cross brace lower flange, and making the width of the upper flange greater than the width of the lower flange, so as to meet the lateral stability requirements of the large-span arch bridge, and the cost of the arch bridge is greatly reduced.

[0031] 2. The present invention provides an arch bridge, which can effectively improve the lateral stability of the arch bridge through the cooperation of arch ribs and arch bridge cross braces, and at the same time reduce the cost of setting the arch bridge cross braces.

[0032] 3. The present invention provides an arch bridge design method, which can complete the design of the arch bridge cross brace, so that the designed arch bridge can meet the lateral stability requirements of the large-span arch bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the arch bridge cross brace when the cross-sectional shape of the upper flange is rectangular in Example 1 of the present invention.

[0034] Figure 2 It is a cross-sectional schematic diagram of the arch bridge cross brace when the cross-sectional shape of the upper flange is rectangular in Example 1 of the present invention.

[0035] Figure 3 Schematic diagram of the coordination between the arch bridge cross brace and the arch bridge arch rib when the cross-sectional shape of the upper flange is rectangular in Example 1 of the present invention Figure 1 .

[0036] Figure 4 Schematic diagram of the coordination between the arch bridge cross brace and the arch bridge arch rib when the cross-sectional shape of the upper flange is rectangular in Example 1 of the present invention Figure 2 .

[0037] Figure 5 It is a schematic structural diagram of the arch bridge cross brace when the cross-sectional shape of the upper flange is a variable cross-section in Example 2 of the present invention.

[0038] Figure 6 It is a schematic structural diagram of the cross bracing frame when the cross-sectional shape of the upper flange is a variable cross-section in Example 2 of the present invention.

[0039] Figure 7 It is a schematic diagram of the coordination between the arch bridge cross brace and the arch bridge arch rib when the cross-sectional shape of the upper flange is a variable cross-section in Example 2 of the present invention.

[0040] Figure 8 This is the design drawing of the middle cross brace of the 600m span rigid skeleton concrete arch bridge described in Example 2.

[0041] Fig. 9 This is a schematic structural diagram of the arch bridge described in Example 3.

[0042] Markings in the figure:

[0043] 1-arch bridge cross brace, 11-cross brace upper flange, 111-first area, 112-second area, 113-third area, 12-cross brace lower flange, 13-cross brace web, 14-cross brace frame, 2-arch rib. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0045] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0047] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0048] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0049] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0050] Example 1

[0051] like Figure 1-2 As shown, this embodiment proposes an arch bridge cross brace 1, including a cross brace upper flange 11, a cross brace web 13 and a cross brace lower flange 12 connected in sequence, wherein the cross brace upper flange 11 and the cross brace lower flange 12 are completely parallel or approximately parallel, the cross brace web 13 is completely vertical or approximately vertical relative to the cross brace upper flange 11 and the cross brace lower flange 12, and the two side edges of the cross brace web 13 are respectively connected to the middle of the cross brace upper flange 11 and the middle of the cross brace lower flange 12.

[0052] When the arch bridge cross brace 1 is applied to an arch bridge, the cross brace upper flange 11 is located outside the cross brace lower flange 12, and the cross brace upper flange 11, the cross brace lower flange 12 and the cross brace web 13 can be connected to the arch ribs 2 on both sides at the same time, playing a supporting and reinforcing role. Among them, the width direction of the cross brace upper flange 11 and the cross brace lower flange 12 is perpendicular to the cross brace web 13 (that is, the width direction of the cross brace upper flange 11 and the cross brace lower flange 12 corresponds to the longitudinal direction of the arch bridge); the length direction of the cross brace upper flange 11 and the cross brace lower flange 12 is parallel to the cross brace web 13 (that is, the length direction of the cross brace upper flange 11 and the cross brace lower flange 12 corresponds to the transverse direction of the arch bridge).

[0053] Through experiments, it was found that when the arch bridge cross brace 1 is applied to an arch bridge and the sum of the widths of the cross brace upper flange 11 and the cross brace lower flange 12 are the same, compared with a structure in which the widths of the cross brace upper flange 11 and the cross brace lower flange 12 are equal (referred to as "upper and lower widths are consistent"), or the width of the cross brace lower flange 12 is greater than the width of the cross brace upper flange 11 (referred to as "narrow at the top and wide at the bottom"), making the width of the cross brace upper flange 11 greater than the width of the cross brace lower flange 12 (referred to as "wide at the top and narrow at the bottom") can more effectively improve the lateral stability of the arch bridge, so as to meet the lateral stability requirements of large-span arch bridges.

[0054] It should be noted that a large span refers to a span greater than 300m, that is, the arch bridge cross brace 1 can meet the lateral stability requirements of an arch bridge with a span greater than 300m. However, it should be noted that the application scenario of the arch bridge cross brace 1 can also be an arch bridge with a smaller span, and is not limited to the application scenario of a large span arch bridge.

[0055] The arch bridge cross brace 1 is a structure of a frame and concrete. The arch bridge cross brace 1 includes a cross brace frame 14 and concrete, and the concrete is coated outside the cross brace frame 14.

[0056] The cross section of the arch rib 2 connected to the arch bridge cross brace 1 can be any shape such as solid rectangle, box type and tube type. Preferably, the arch rib 2 adopts a box type cross section.

[0057] On this basis, the rigid frame of the arch rib 2 can be connected to the cross bracing frame 14, for example, by welding, and concrete can be poured together.

[0058] The test process is as follows:

[0059] like Figure 3-4 As shown, a three-dimensional model is constructed, wherein an arch bridge cross brace including a cross brace upper flange 11, a cross brace web 13 and a cross brace lower flange 12 is arranged in the arch bridge, wherein the influencing factors involved in the stability of the cross brace include: the arch height h d , is the arch foot height h j , arch width B, arch rib width B x , arch axis coefficient m, calculated rise of arch bridge f, calculated span of arch bridge L, upper flange width of cross brace hcs, lower flange width of cross brace hcx, and cross brace spacing hcd.

[0060] In order to study the stability performance of the cross bracing structure under different influencing factors, orthogonal tests can be carried out on the above ten influencing factors, among which each influencing factor and its level range are shown in Table 1.

[0061] Table 1 Influencing factors and horizontal range (unit: m)

[0062]

[0063]

[0064] Orthogonal tests were conducted on 10 combinations of influencing factors in 6 level ranges. The orthogonal test table and corresponding results are shown in Table 2.

[0065] Table 2 Orthogonal test results of arch bridges with different spans (unit: m)

[0066]

[0067]

[0068]

[0069] Data processing was performed on the 10 influencing factors respectively, and the results of multi-factor variance analysis of the arch bridge orthogonal test were obtained, as shown in Tables 3 and 4.

[0070] Table 3 Results of multi-factor variance analysis of lateral instability

[0071] Lateral stability L <![CDATA[h d ]]> <![CDATA[h j ]]> B <![CDATA[B x ]]> m f hcs HC hcd F-number 125.116 33.891 39.898 76.034 25.181 4.283 7.366 14.385 4.425 18.969 Test P value 0.000 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.004 0.000 in conclusion Very significant Very significant Very significant Very significant Very significant Very obvious Very significant Very significant Very obvious Very significant

[0072] Table 4 Results of multi-factor variance analysis of first-order instability

[0073] First-order stability L <![CDATA[h d ]]> <![CDATA[h j ]]> B <![CDATA[B x ]]> m f hcs HC hcd F-number 194.496 165.094 84.307 6.430 24.431 0.497 3.032 12.792 1.217 3.793 Test P value 0.000 0.000 0.000 0.000 0.000 0.776 0.025 0.000 0.325 0.009 in conclusion Very significant Very significant Very significant Very significant Very significant Not significant Significant Very significant Not significant Very obvious

[0074] Note: When P>0.05, the influence of the influencing factor is not significant; when P≤0.05, the influence of the influencing factor is significant, among which, when 0.01<P≤0.05, the influence of the influencing factor is significant, when 0.001<P≤0.01, the influence of the influencing factor is very significant, and when P≤0.001, the influence of the influencing factor is extremely significant.

[0075] It can be seen that both the width and spacing of the cross braces have a significant impact on the lateral stability, and increasing the upper flange of the cross brace has a better effect than increasing the lower flange of the cross brace.

[0076] It can be seen that when the amount of materials used is the same, making the width of the upper flange 11 of the cross brace larger than the width of the lower flange 12 of the cross brace can more effectively improve the lateral stability of the arch bridge. In addition, during the construction of the arch bridge, the upper side of the arch bridge cross brace 1 is easier to construct than the lower side, so setting the arch bridge cross brace 1 to be "wide at the top and narrow at the bottom" is more suitable for convenience in the actual construction process.

[0077] Based on the above research, the size design of a span rigid skeleton arch bridge is shown in Table 5.

[0078] Table 5 Reasonable size design of super-long span rigid skeleton arch bridge

[0079]

[0080]

[0081] Therefore, the following method can be used to set the width of the cross brace for different spans:

[0082] hcs=L / 100+△

[0083] hcx=hcs / 2

[0084] Where: hcs is the width of the upper flange of the cross brace, hcx is the width of the lower flange of the cross brace, L is the calculated span of the arch bridge, △ is the correction width, and △ is taken as 0~2m. The specific width of the cross brace can be adjusted as needed to match it with the longitudinal stability and achieve the best economic benefit.

[0085] The horizontal brace spacing (hcd) should be (1 / 17~1 / 12)L, which should be consistent with the position of the building on the arch. The main factor affecting stability is the width of the upper and lower flanges. The horizontal brace spacing should be consistent with the spacing of the building on the arch, which can save the material of the "I"-shaped horizontal brace web and help save construction costs.

[0086] Through this cross bracing arrangement, the structural stability can be effectively increased.

[0087] Preferably, the height of the cross bracing web 13 can be adapted to the height of the arch rib 2, thereby further improving the lateral stability of the arch bridge.

[0088] The above test is mainly conducted on the basis that the cross-sectional shapes of the upper flange 11 and the lower flange 12 of the cross brace are both rectangular. Figure 1-2 shown.

[0089] Among them, based on the above test, taking a 600m-class arch bridge as an example, the cost of the cross brace is estimated:

[0090] Table 6 Cost estimation of different cross braces for main span 600mm arch bridge

[0091]

[0092] Based on the above, a method for arch bridge design can be summarized, including the following steps:

[0093] S1: Select multiple influencing factors and conduct orthogonal tests. The influencing factors of the cross brace stability include: arch height h d , is the arch foot height h j , arch width B, arch rib width B x , arch axis coefficient m, calculated rise of arch bridge f, calculated span of arch bridge L, upper flange width of cross brace hcs, lower flange width of cross brace hcx, and cross brace spacing hcd.

[0094] S2: A multi-factor variance analysis was conducted on the orthogonal test of the arch bridge to obtain the sensitive influencing factors. It can be seen that both the width and spacing of the cross braces have a significant impact on the lateral stability, and increasing the upper flange of the cross brace has a better effect than increasing the lower flange of the cross brace.

[0095] S3: The width of the upper flange 11 of the cross brace is determined by the following formula:

[0096] hcs=L / 100+△, where: hcs is the width of the upper flange of the cross brace, L is the calculated span of the arch bridge, and △ is the corrected width;

[0097] The average width of the lower flange 12 of the cross brace is determined by the following formula:

[0098] hcx=hcs / 2, where: hcx is the average width of the lower flange of the cross brace;

[0099] The height of the cross bracing web 13 is adapted to the height of the arch rib 2 .

[0100] The cross brace spacing of the arch bridge cross brace 1 is 1 / 17 to 1 / 12 of the calculated span of the arch bridge.

[0101] Furthermore, when the cross-sectional shape of the upper flange 11 of the horizontal brace is a rectangle, the steps are as follows:

[0102] A1. Obtain the length of the arch bridge cross brace 1 based on the spacing between the adjacent arch ribs 2. This length can be used as the length of the cross brace upper flange 11, the cross brace lower flange 12 and the cross brace web 13;

[0103] A2. Obtain the first-order lateral bending instability coefficient of the arch bridge under different flange widths;

[0104] A3. Based on the first-order lateral bending instability coefficient under different flange widths and the first-order lateral bending instability coefficient required for the arch bridge, select the appropriate width of the upper flange 11 of the cross brace and the width of the lower flange 12 of the cross brace.

[0105] At this time, in actual construction, the width of the above-mentioned adapted cross brace upper flange 11 can be used as the width of the cross brace upper flange 11, the width of the above-mentioned adapted cross brace lower flange 12 can be used as the width of the cross brace lower flange 12, and the length of the above-mentioned arch bridge cross brace 1 can be used as the length of the cross brace upper flange 11, the cross brace lower flange 12 and the cross brace web 13, thereby completing the design of the arch bridge cross brace 1 accordingly.

[0106] Example 2

[0107] The difference between this embodiment and embodiment 1 is that in this embodiment, the upper flange 11 of the cross brace is designed to have a variable width, such as Figure 5-7 shown.

[0108] Specifically, the upper flange 11 of the cross brace includes a first area 111, a second area 112 and a third area 113 which are connected in sequence along its length direction. The second area 112 is set with equal width. The widths of the first area 111 and the third area 113 increase continuously or discontinuously from the second area 112 respectively. The average width of the upper flange 11 of the cross brace is the average width of the first area 111, the second area 112 and the third area 113.

[0109] Further preferably, the cross-sectional shape of the second region 112 is rectangular, and the cross-sectional shapes of the first region 111 and the third region 113 are isosceles trapezoids.

[0110] Taking a 600m span rigid skeleton concrete arch bridge as an example, the cross brace design is as follows: Figure 8 As shown in the figure, the upper flange of the cross brace is designed to have a variable width. The maximum width of the upper flange of the cross brace is 12m, the minimum width is 6m, and the width of the lower flange of the cross brace is 4m. At this time, the first-order instability coefficient is 9.262. Compared with the instability coefficient of 9.041 under the same material dosage (the upper flange of the cross brace has a constant width of 7.45m), the stability is improved by 2.4%.

[0111] In a method for designing an arch bridge, when the cross-sectional shape of the upper flange 11 of the cross brace is a variable cross-section, the method further includes the steps of:

[0112] A4. Construct a reference rectangle, wherein the width of the reference rectangle is consistent with the width of the selected adapted cross brace upper flange 11, and the length of the reference rectangle is consistent with the length of the arch bridge cross brace 1;

[0113] A5. Based on the reference rectangle and the selected adapted width of the cross brace lower flange 12, the cross-sectional shape of the cross brace upper flange 11 is deformed, wherein the length of the cross brace upper flange 11 is consistent with the length of the reference rectangle, the two base angles of the isosceles trapezoid are [45°, 90°), the first width of the cross brace upper flange 11 is greater than the width of the reference rectangle, the second width of the cross brace upper flange 11 is less than the width of the reference rectangle and greater than the width of the cross brace lower flange 12, and the cross-sectional area of ​​the cross brace upper flange 11 is consistent with the area of ​​the reference rectangle.

[0114] At this time, in actual construction, the cross-sectional shape of the upper flange 11 of the cross brace can be obtained through the design method of the cross-sectional shape of the upper flange 11 of the cross brace in step A5, the width of the adapted lower flange 12 of the cross brace mentioned in step A3 can be used as the width of the lower flange 12 of the cross brace, and the length of the arch bridge cross brace 1 mentioned in step A1 can be used as the length of the upper flange 11 of the cross brace, the lower flange 12 of the cross brace and the web 13 of the cross brace, thereby completing the design of the arch bridge cross brace 1 accordingly.

[0115] Example 3

[0116] like Fig. 9 As shown, this embodiment proposes an arch bridge, comprising at least two arch ribs 2 and a plurality of arch bridge cross braces 1 described in Embodiment 1 or 2, wherein the two ends of the arch bridge cross brace 1 are respectively connected to two adjacent arch ribs 2, and the plurality of arch bridge cross braces 1 are spaced apart and distributed along the length direction of the arch rib 2.

[0117] The cooperation between the arch rib 2 and the arch bridge cross brace 1 can effectively improve the lateral stability of the arch bridge, while reducing the cost of setting the arch bridge cross brace 1.

[0118] The cross brace spacing of the arch bridge cross brace 1 is 1 / 17 to 1 / 12 of the calculated span of the arch bridge, and the cross brace spacing is consistent with the building position on the arch.

[0119] The cross section of the arch rib 2 connected to the arch bridge cross brace 1 can be any shape such as solid rectangle, box type and tube type. Preferably, the arch rib 2 adopts a box type cross section.

[0120] Both the arch bridge cross brace 1 and the arch rib 2 can be a structure of concrete and a frame, wherein the arch bridge cross brace 1 includes a cross brace frame 14; the arch rib frame of the arch rib 2 is connected to the cross brace frame 14, and concrete is poured together later.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rigid skeleton concrete arch bridge cross brace (1), characterized in that: It comprises a transverse brace upper flange (11), a transverse brace web (13) and a transverse brace lower flange (12) which are connected in sequence; The cross brace upper flange (11), the cross brace web (13) and the cross brace lower flange (12) all include a cross brace frame (14) and concrete, the cross brace frame (14) is used to connect with the arch rib frame, and the concrete is coated outside the cross brace frame (14); The width of the upper flange (11) of the cross brace is greater than the width of the lower flange (12) of the cross brace.

2. A rigid skeleton concrete arch bridge cross brace (1) according to claim 1, characterized in that: The average width of the upper flange (11) of the cross brace is determined by the following formula: hcs=L / 100+△, where: hcs is the average width of the upper flange of the cross brace, L is the calculated span of the arch bridge, and △ is the corrected width; The average width of the lower flange (12) of the cross brace is determined by the following formula: hcx=hcs / 2, where: hcx is the average width of the lower flange of the cross brace; The height of the cross bracing web (13) is adapted to the height of the arch rib (2).

3. A rigid skeleton concrete arch bridge cross brace (1) according to claim 2, characterized in that: The cross-sectional shapes of the upper flange (11) of the cross brace and the lower flange (12) of the cross brace are both rectangular, and the average width of the upper flange (11) of the cross brace and the lower flange (12) of the cross brace is the width of the rectangle.

4. A rigid skeleton concrete arch bridge cross brace (1) according to claim 2, characterized in that: The upper flange (11) of the cross brace comprises a first region (111), a second region (112) and a third region (113) connected in sequence along its length direction; the second region (112) is arranged with equal width; the widths of the first region (111) and the third region (113) increase continuously or discontinuously from the second region (112); and the average width of the upper flange (11) of the cross brace is the average width of the first region (111), the second region (112) and the third region (113).

5. A rigid skeleton concrete arch bridge cross brace (1) according to claim 4, characterized in that: The cross-sectional shape of the second region (112) is rectangular, and the cross-sectional shapes of the first region (111) and the third region (113) are isosceles trapezoids.

6. A rigid skeleton concrete arch bridge cross brace (1) according to any one of claims 1 to 5, characterized in that: The cross brace frame (14) is used for welding connection with the arch rib frame.

7. An arch bridge, characterized in that: It comprises at least two arch ribs (2) and a plurality of arch bridge cross braces (1) as described in any one of claims 1 to 6, wherein the two ends of the arch bridge cross brace (1) are respectively connected to two adjacent arch ribs (2), and the cross brace frame (14) is connected to the arch rib frame and concrete is poured together.

8. The arch bridge according to claim 6, characterized in that: The cross brace spacing of the arch bridge cross brace (1) is 1 / 17 to 1 / 12 of the calculated span of the arch bridge, and / or the cross brace spacing of the arch bridge cross brace (1) is consistent with the building position on the arch.

9. A method for designing an arch bridge, characterized in that: Used to design the arch bridge cross brace (1) according to any one of claims 1 to 6, comprising the steps of: S1: Select multiple influencing factors and conduct orthogonal experiments; S2: Conduct multi-factor variance analysis of arch bridge orthogonal test to obtain sensitive influencing factors; S3: The width of the upper flange (11) of the cross brace is determined by the following formula: hcs=L / 100+△, where: hcs is the width of the upper flange of the cross brace, L is the calculated span of the arch bridge, and △ is the corrected width; The average width of the lower flange (12) of the cross brace is determined by the following formula: hcx=hcs / 2, where: hcx is the average width of the lower flange of the cross brace; The height of the cross bracing web (13) is adapted to the height of the arch rib (2).

10. The arch bridge design method according to claim 9, characterized in that: Includes steps: The cross brace spacing of the arch bridge cross brace (1) is 1 / 17 to 1 / 12 of the calculated span of the arch bridge, and / or the cross brace spacing of the arch bridge cross brace (1) is consistent with the building position on the arch.

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