Design method suitable for bridge sound barrier integrated guardrail

Abstract

The invention relates to the technical field of traffic safety facilities, in particular to a design method suitable for a bridge sound barrier integrated guardrail, which comprises the following steps: determining the protection level of the guardrail; according to the use environment of the bridge sound barrier integrated guardrail, wind pressure and height are determined, then the design wind load of a sound barrier is calculated, and the size of a stand column and the steel type are preliminarily determined according to the design wind load; according to the structure of the bridge sound barrier integrated guardrail, the design collision load of the bridge sound barrier integrated guardrail is calculated; coupling the design wind load and the design collision load, checking whether the bridge sound barrier integrated guardrail meets the design requirements or not, and completing the design of the bridge sound barrier integrated guardrail. According to the method, the problem that a sound barrier and guardrail collaborative design method is lacked is systematically solved, the secondary damage risk caused by the tripping effect of a traditional bridge sound barrier stand column when a vehicle is out of control and collides in the prior art is overcome, and the safety compatibility of protection facilities is improved.

Description

Technical Field

[0001] This invention relates to the technical field of traffic safety facilities, and in particular to a design method for an integrated guardrail suitable for bridge sound barriers. Background Technology

[0002] With the rapid development of urban transportation networks, double-deck highway bridges have become a key technical means to alleviate land resource constraints and optimize road network layout. However, traffic noise from the upper deck poses a serious threat to the surrounding environment, making sound barriers a necessary noise reduction facility. Meanwhile, bridge railings are an important safety measure for highways.

[0003] According to relevant regulations, sound barrier design does not consider vehicle impact; therefore, other measures should be taken to account for the impact force. The impact of out-of-control vehicles cannot be resisted by the sound barrier structure itself; instead, a metal crash barrier should be installed in front of the sound barrier structure to prevent collisions from out-of-control vehicles.

[0004] To reduce the variety of foundation types for facilities such as anti-falling object nets, sound barriers, and light poles, and considering ease of construction, maintenance, and cost savings over the entire life cycle of these facilities, an integrated design of bridge railings and related facility foundations is recommended. When sound barriers are combined with concrete railings, the sound barrier posts become obstacles; out-of-control vehicles tilting to the side are highly likely to collide with these posts, causing obstruction and potentially injury. To avoid the impact of sound barriers on the safety performance of railings, and considering the ease of construction and maintenance of sound barriers, a collaborative protection system for bridge railings and sound barriers is proposed. This system places the sound barrier on top of a concrete base and forms a collaborative anti-collision system with the railings, effectively preventing obstruction of the posts during vehicle collisions. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies in addressing the risk of secondary injury caused by the tripping effect of traditional bridge sound barrier columns when a vehicle loses control and collides, and to provide a design method suitable for integrated guardrails for bridge sound barriers.

[0006] In a first aspect, the present invention provides a design method for integrated guardrails for bridge sound barriers, comprising the following steps:

[0007] S1. Determine the protection level of the integrated bridge sound barrier railing; S2. Based on the usage environment of the integrated bridge sound barrier railing, calculate the design wind load of the sound barrier, and preliminarily determine the size of the column and the steel type based on the design wind load. S3. Based on the structure of the integrated bridge sound barrier guardrail, calculate the design collision load of the integrated bridge sound barrier guardrail. S4. Couple the design wind load and design collision load to verify whether the integrated bridge sound barrier railing meets the design requirements and complete the design of the integrated bridge sound barrier railing.

[0008] The protection levels of guardrails include HA, HB, SS, SA, SB, A, B, and C. The protection level of bridge guardrails is determined from two aspects: firstly, the bridge's usage conditions, which include general bridges and bridges crossing highways, expressways, rail transit, or water source protection areas; and secondly, the bridge's design speed, as detailed in relevant standards.

[0009] Based on the design wind load of the sound barrier, the horizontal displacement at the top of the column, the bending moment at the bottom of the column, and the axial force at the bottom of the column are listed. The horizontal displacement at the top needs to be less than or equal to the corresponding threshold. The section strength and shear strength of the column are listed using the bending moment and axial force at the bottom of the column. The section strength and shear strength of the column also need to be less than or equal to the corresponding threshold. Based on the above relationships, the dimensions and steel type of the column are determined, and then the design collision load of the integrated bridge sound barrier is calculated. The design collision load of the integrated bridge sound barrier includes the design collision load of the barrier concrete and the design collision load of the sound barrier beams. The design wind load and the design collision load are then coupled and verified. If the integrated bridge sound barrier meets the coupled design wind load and design collision load, the design of the integrated bridge sound barrier is completed. This application not only calculates the design wind load and design collision load but also couples them, thus meeting both the collision protection requirements and the wind load resistance requirements.

[0010] Preferably, in S3, when calculating the design collision load of the integrated bridge sound barrier guardrail, the standard value of the guardrail concrete's resistance to lateral loads is calculated separately. R w and crossbeam design bearing resistance R Then calculate the design load-bearing capacity of the integrated bridge sound barrier railing. .

[0011] Design load-bearing capacity of integrated bridge sound barrier railing according to R w and R The calculations show that the crossbeam is the crossbeam of the sound barrier.

[0012] Preferably, calculation R w When a collision occurs at a standard section of the guardrail, calculate the standard value of the guardrail's first resistance to lateral loads. R w1 ; and the second standard value of the guardrail's resistance to lateral loads, where the collision occurs at the end of the guardrail or at the expansion joint. Rw2 Standard value of guardrail resistance to lateral loads .

[0013] The standard section of a guardrail, also known as the general section or intermediate section, refers to a road section in the guardrail design where its structural form, cross-sectional dimensions, material strength, and protective capacity are representative and fully reflect the design protection level requirements. The collision mechanism differs when a collision occurs in the standard section compared to when it occurs at the end of the guardrail or at an expansion joint; therefore, they are calculated separately, and the most unfavorable value is taken as the standard section. R w .

[0014] Preferably, calculation R w1 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w11 Standard value of lateral load resistance of column when failure occurs R w12 , ;calculate R w2 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w21 Standard value of lateral load resistance of column when failure occurs R w22 , .

[0015] The collision mechanisms differ when they occur at the column and at the mid-span, so they are calculated separately, and the most unfavorable value is taken as the parameter value.

[0016] Preferably, R w The design bending moment of the guardrail concrete about the longitudinal axis of the bridge is determined by... M C Obtain, calculate M C At that time, first divide the guardrail into sections along the longitudinal direction of the bridge. nu Segment, calculate the first one respectively j Segment bending bearing moment M Cj ,in j ={1,2… nu}, and then according to M Cj Calculate the location of the damage M C .

[0017] The location of the damage includes damage occurring on a standard section of the guardrail, at the end of the guardrail, or at an expansion joint.

[0018] Preferably, calculation The design of the integrated bridge sound barrier and guardrail takes into account the load-bearing capacity of the first bridge sound barrier when the collision occurs at the mid-span of the metal beam. The load-bearing capacity of the integrated guardrail design for the second bridge sound barrier when the collision occurs at the column. , .

[0019] Preferably, calculation R At that time, calculate the design bearing capacity of the crossbeam when the collision damage does not include the end columns. R 1; and the design bearing capacity of the crossbeams during collision damage, including at the end columns. R 2. Bearing capacity of the beams of the sound barrier ...

[0020] Preferably, calculation R At time 1, calculate the bearing resistance for failure of odd-numbered spans and even-numbered spans respectively, and take the most unfavorable result. R 1.

[0021] Preferably, when considering the requirements of the coupled wind load and collision load on the overall sound barrier in S4, the columns can be used to resist the design bending moment capacity. M collision,available The following formula can be used to obtain: M collision,available = M post M wind in, M post The design bending moment of the column. M wind The wind load is the design load for the sound barrier.

[0022] Preferably, in S2, the column spacing is determined by the design wind load. L and column height H .

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a design method for integrated bridge sound barrier railings. First, the protection level of the railing is determined. Then, the design wind load of the sound barrier is calculated, and the dimensions and steel type of the columns are initially determined based on the design wind load. Next, the design collision load of the integrated bridge sound barrier railing is calculated. Finally, the design wind load and design collision load are coupled to verify whether the integrated bridge sound barrier railing meets the design requirements, thus completing the design of the integrated bridge sound barrier railing. Based on the design wind load of the sound barrier, the horizontal displacement at the top of the column, the bending moment at the bottom of the column, and the axial force at the bottom of the column are listed. The horizontal displacement at the top must be less than or equal to the corresponding threshold. The section strength and shear strength of the column are listed using the bending moment and axial force at the bottom of the column. The section strength and shear strength of the column must be less than or equal to the corresponding threshold. Based on the above relationships, the dimensions and steel type of the columns are determined, and then the design collision load of the integrated bridge sound barrier railing is calculated. The design collision load of the integrated bridge sound barrier railing includes the design collision load of the railing concrete and the design collision load of the sound barrier beams. The design wind load and design collision load are then coupled and verified. If the integrated bridge sound barrier railing meets the coupled design wind load and design collision load, the design of the integrated bridge sound barrier railing is complete. This application not only calculates the design wind load and design collision load, but also couples them, thus meeting both the collision protection and wind load resistance requirements. This application addresses the problem that existing standards do not cover the design method of integrated bridge sound barrier railings, providing a systematic and scientific design method that overcomes the risk of secondary injury caused by the tripping effect of traditional bridge sound barrier columns in the event of a collision due to vehicle loss of control. Attached Figure Description

[0024] Figure 1 A flowchart illustrating a design method for an integrated guardrail for bridge sound barriers according to the present invention; Figure 2 This is a front view of a design method for an integrated guardrail for bridge sound barriers according to the present invention; Figure 3 This is a side view of a design method for an integrated guardrail for bridge sound barriers according to the present invention. icon: 2-Post, 3-Concrete guardrail, 4-Beam, 5-Positioning steel plate, 6-Flange, 7-Connecting bolt, 8-Bridge deck, 9-Bridge deck pavement, 10-Anchor bolt. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0026] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0027] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0028] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0029] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0030] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0031] Example 1 like Figures 1 to 3 As shown, a design method for integrated guardrails suitable for bridge sound barriers includes the following steps: S1. Determine the protection level of the integrated bridge sound barrier railing; S2. Based on the usage environment of the integrated bridge sound barrier railing, calculate the design wind load of the sound barrier, and preliminarily determine the size and steel type of column 2 based on the design wind load. S3. Based on the structure of the integrated bridge sound barrier guardrail, calculate the design collision load of the integrated bridge sound barrier guardrail. S4. Couple the design wind load and design collision load to verify whether the integrated bridge sound barrier railing meets the design requirements and complete the design of the integrated bridge sound barrier railing.

[0032] The protection levels of guardrails include HA, HB, SS, SA, SB, A, B, and C. The protection level of bridge guardrails is determined from two aspects: firstly, the bridge's usage conditions, which include general bridges and bridges crossing highways, expressways, rail transit, or water source protection areas; and secondly, the bridge's design speed, as detailed in relevant standards.

[0033] Based on the design wind load of the sound barrier, the horizontal displacement at the top of column 2, the bending moment at the bottom of column 2, and the axial force at the bottom of column 2 are listed. The horizontal displacement at the top needs to be less than or equal to the corresponding threshold. The section strength and shear strength of column 2 are listed using the bending moment and axial force at the bottom of column 2. The section strength and shear strength of column 2 also need to be less than or equal to the corresponding threshold. Based on the above relationships, the dimensions and steel type of column 2 are determined. Next, the design collision load of the integrated bridge sound barrier is calculated. The design collision load of the integrated bridge sound barrier includes the design collision load of the barrier concrete 3 and the design collision load of the sound barrier beam 4. The design wind load and design collision load are then coupled and verified. If the integrated bridge sound barrier meets the coupled design wind load and design collision load, the design of the integrated bridge sound barrier is completed. This application not only calculates the design wind load and design collision load but also couples them, satisfying both the collision protection requirements and the wind load resistance requirements.

[0034] Furthermore, in step S1, the lateral load collision standard value of the guardrail is determined according to the guardrail's protection level. F t .

[0035] Furthermore, in S3, when calculating the design collision load of the integrated bridge sound barrier guardrail, the standard value of the guardrail concrete resistance to lateral loads is calculated separately.R w The beams of the sound barrier are designed to bear resistance. R Then calculate the design load-bearing capacity of the integrated bridge sound barrier railing. .like and If the collision load initially meets the collision requirements of the corresponding guardrail protection level, then further... The calculation. If R w and or R Less than F t Then return to step S2 to readjust the size and steel type of column 2.

[0036] Further calculation R w When a collision occurs at a standard section of the guardrail, calculate the standard value of the guardrail's first resistance to lateral loads. R w1 ; and the second standard value of the guardrail's resistance to lateral loads, where the collision occurs at the end of the guardrail or at the expansion joint. R w2 Standard value of guardrail resistance to lateral loads .

[0037] Further calculation R w1 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w11 Standard value of lateral load resistance of column 2 when failure occurs at column 2 R w12 , ;calculate R w2 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w21 Standard value of lateral load resistance of column 2 when failure occurs at column 2 R w22 , .

[0038] Furthermore, R w The design bending moment of the guardrail concrete about the longitudinal axis of the bridge is determined by the following parameters. M C Obtain, calculate M C At that time, first divide the guardrail into sections along the longitudinal direction of the bridge. nu Segment, calculate the first one respectively j Segment bending bearing moment M Cj ,inj ={1,2… nu}, and then according to M Cj Calculate the location of the damage M C .

[0039] Further calculation The design of the integrated bridge sound barrier and guardrail takes into account the load-bearing capacity of the first bridge sound barrier in the four spans of the metal beam where the collision occurs. The impact occurred at column 2, and the load-bearing capacity of the integrated guardrail design for the second bridge sound barrier. , .

[0040] Further calculation R When calculating the collision damage excluding end column 2, the design bearing capacity of the beam 4) is calculated separately. R 1; and the design bearing capacity of the crossbeam 4 when impact damage includes the end column 2. R 2. The load-bearing capacity of the crossbeams 4 of the sound barrier. .

[0041] Further calculation R At time 1, calculate the bearing resistance for failure of odd-numbered spans and even-numbered spans respectively, and take the most unfavorable result. R 1.

[0042] Furthermore, when considering the requirements of coupled wind load and collision load on the overall sound barrier in S4, column 2 can be used to resist the design bending moment capacity. M collision,available The following formula can be used to obtain: M collision,available = M post M wind in, M post The design bending moment of column 2. M wind The wind load is the design load for the sound barrier.

[0043] Furthermore, in S2, the spacing of column 2 is determined by designing the wind load. L and column height 2 H .

[0044] In this embodiment, as Figure 2 and Figure 3As shown, the column 2 is connected to the top surface of the guardrail concrete 3 via flange 6 and positioning steel plate 5. Anchor bolts 10 pass through flange 6 and positioning steel plate 5 and extend into the guardrail concrete 3, thereby connecting the column 2 to the guardrail concrete 3. The bottom surface of the guardrail concrete 3 is connected to the bridge deck pavement 9, which is located on the top surface of the bridge deck 8. The two crossbeams 4 connected at the ends are connected by connecting bolts 7.

[0045] The specific calculation method is as follows: 1. Based on the usage environment of the integrated bridge sound barrier guardrail, the protection level of the guardrail is determined to be SS level (extra-high protection level), with the corresponding lateral load collision standard value. F t =520kN.

[0046] 2. Calculated wind load.

[0047] 2.1 Wind load calculation The standard value of the horizontal lateral wind load acting on the wind barrier is calculated according to formula (5.2.7) in Article 5.2.7 of the "Technical Standard for Sound Barrier Structures" (GB / T 51335-2018). (kN / m) 2 ):

[0048] When determining the parameters, the embankment height was initially determined by considering the most unfavorable situation for a typical embankment, so the bridge height was initially determined to be 30.0m. Furthermore, according to Article 8.2.1 of the "Code for Design of Building Structures" (GB 50009-2012), the ground roughness category was determined to be Class B.

[0049] in, —The gust coefficient at height z is determined to be 2.4 according to Table 5.2.7-1 of Clause 5.2.7 of the "Technical Standard for Noise Barrier Structures" (GB / T 51335-2018); —The local shape coefficient for wind load is determined to be 1.65 according to Clause 5.2.7 of the "Technical Standard for Noise Barrier Structures" (GB / T 51335-2018); —The wind pressure height variation coefficient is determined to be 0.51 according to Table 5.2.7-1 of Clause 5.2.7 of the "Technical Standard for Sound Barrier Structures" (GB / T 51335-2018); —The basic wind pressure, determined according to Appendix E.5 of the "Code for Design of Building Structures" (GB 50009-2012) and the usage environment of the integrated bridge sound barrier guardrail, is 0.75 kN / m. 2 .

[0050] 2.2 Column 2 bears a uniformly distributed load Load of the bridge sound barrier on column 2

[0051] in, L — The distance between two adjacent columns 2.

[0052] 2.3 Internal forces at the bottom of column 2 Bending moment at the bottom of column 2

[0053] Bottom shear force of column 2

[0054] Axial force at the bottom of column 2

[0055] 2.4 Referring to Clause 5.3.3 of the "Technical Standard for Sound Barrier Structures" (GB / T 51335-2018), under the design standard value of wind load, the wind pressure resistance performance of the structure shall meet the following requirements: the horizontal displacement value of the top of column 2 shall not exceed [a certain value]. H / 200, of which H This is the height of column 2.

[0056]

[0057] in, E Let be the elastic modulus of column 2. I Let be the moment of inertia of the cross section of column 2. Using the above formula, we obtain... H .

[0058] 2.5 Other dimensions of column 2 are obtained through strength verification of column 2, according to Articles 8.1.1 and 6.1.3 of the "Standard for Design of Steel Structures" (GB50017-2017).

[0059]

[0060] in, N —Design value of axial compressive force (N) at the same cross section; —Design value of bending moment about the x-axis at the same cross section (N·mm); —Coefficient of plastic development of cross section; —Net cross-sectional area of ​​the component (mm²) 2 ); —Net section modulus of the component with respect to the x-axis (mm); V —Calculate the design value (N) of the shear force acting along the web plane at the cross section; S — Calculate the area moment (mm) of the gross section above (or below) the shear stress point about the neutral axis; I — Gross moment of inertia of the component (mm) 3 ); —Web thickness of the component (mm); —Design value of shear strength of steel (N / mm) 2 ).

[0061] 3. Structural requirements under collision loads 3.1 Concrete guardrail 3 3.1.1 Calculation of the bearing capacity of concrete 3 for guardrail Determine the basic information such as the type and spacing of the reinforcing bars inside the concrete of the guardrail.

[0062] 3.1.2 Collision Load SS-grade bridge railings, standard value for lateral vehicle collision load. F t =520kN, referring to Table 3.5.4 of the "Design Specifications for Highway Traffic Safety Facilities" (JTG / T D81-2017), the load distribution length of the guardrail is taken as 520kN. L t =2.4m.

[0063] 3.1.3 Design bending moment of guardrails relative to the longitudinal axis of the bridge M C The guardrail has a non-standard cross-section and is divided into sections. nu The calculation is performed by taking the average value of the segments.

[0064] Calculate the vertical sections of the (n+1) longitudinal sections of the n-segment beam 4. M Cj .

[0065] In this embodiment, nu =3 Example calculation.

[0066] Calculate the vertical cross-sections of the four longitudinal sections of the three beam segments respectively. M C1 , M C2 and M C3 .

[0067] When damage occurs in a standard section of the guardrail:

[0068] in,H 1 represents the height of the first section of the guardrail. H 2 represents the height of the second section of the guardrail.

[0069] When damage occurs at the end of the guardrail or at the expansion joint: .

[0070] 3.1.4 Additional bending moment M of the crossbeams at the top of the guardrail, excluding Mw b Because the concrete wall of the integrated bridge sound barrier is calculated separately from the upper crossbeam 4, therefore M b =0.

[0071] 3.1.5 Bending moment M of the guardrail about its vertical axis w Divide the vertical section of the guardrail concrete 3 into three parts (the plane containing this section is perpendicular to the length direction of the interconnecting concrete), and calculate the bending moment M of each part about its vertical axis. w1 M w2 and M w3 .

[0072] (1) When the collision occurs on a standard section of the guardrail a. The collision occurred at the mid-span.

[0073]

[0074] in, —The critical length at which the yield line occurs.

[0075]

[0076] b. The collision occurred at point 2 of the pillar.

[0077]

[0078]

[0079] Ultimately, the worst outcome between the two collision modes is selected.

[0080] (2) When the collision occurs at the end of the guardrail or at the expansion joint a. The collision occurred at the mid-span.

[0081]

[0082]

[0083] b. The collision occurred at point 2 of the pillar.

[0084]

[0085]

[0086] The worst possible outcome between the two collision modes is taken as the final value.

[0087] 3.2 Calculation of the bearing capacity of the upper crossbeam 4 3.2.1 Obtain the structural and material parameters of beam 4 3.2.2 Calculation of the inelastic or yield line bending moment of the single beam 4 and column 2 constituting the plastic hinge In this embodiment, multiple crossbeams 4 have the same specifications, and the bending bearing moment of each crossbeam 4 is... All are:

[0088] Bending bearing moment of column 2 for:

[0089] The above calculations do not take into account the effect of longitudinal collision load on the plastic bending moment of column 2.

[0090] 3.2.3 Plastic modulus of multiple crossbeams 4

[0091]

[0092] in ——No. i Bearing capacity (N) of beam 4 ——No. i Distance (m) from the bridge deck to the 4th crossbeam; —The sum of the resistance of each of the four crossbeams above the bridge deck 8.

[0093] 3.2.4 Calculation of the bearing capacity of the upper crossbeam 4 (1) When the destruction mode does not include end post 2

[0094] ① The number of spans included in the destruction mode N When it is an odd number:

[0095] ② The number of spans included in the destruction mode N When it is even

[0096] Take the minimum value calculated from the two cases above. R .

[0097] (2) When the failure mode includes end post 2 For any number of beams with 4 spans N To be honest

[0098] Select the minimum value as R .

[0099] 4. Composite calculation of the load-bearing capacity of the combined guardrail 4.1 When the vehicle collision occurred at the midpoint of the four spans of the metal crossbeam.

[0100] in, —Ultimate resistance of a single span of beam (kN); — Height of beam 4 (m); — Height of the concrete wall of the guardrail (m).

[0101] 4.2 When the vehicle collision occurs at point 2 of the pillar.

[0102] in: —Ultimate lateral resistance of the two spans of crossbeams (kN); —The reduced resistance (kN) of the concrete wall to the column load.

[0103] Take the most unfavorable outcome of the two scenarios as The corresponding result is the final one. Completed the design of the integrated bridge sound barrier railing.

[0104] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A design method for integrated guardrails for bridge sound barriers, characterized in that, Includes the following steps: S1. Determine the protection level of the integrated bridge sound barrier railing; S2. Based on the usage environment of the integrated guardrail of the bridge sound barrier, calculate the design wind load of the sound barrier, and preliminarily determine the size and steel type of the column (2) based on the design wind load. S3. Based on the structure of the integrated bridge sound barrier guardrail, calculate the design collision load of the integrated bridge sound barrier guardrail. S4. Couple the design wind load and design collision load to verify whether the integrated bridge sound barrier railing meets the design requirements and complete the design of the integrated bridge sound barrier railing.

2. The design method for an integrated bridge sound barrier railing according to claim 1, characterized in that, In S3, when calculating the design collision load of the integrated bridge sound barrier guardrail, the standard value of the guardrail concrete (3) against the transverse load is calculated separately. R w and crossbeam design bearing resistance R Then calculate the design load-bearing capacity of the integrated bridge sound barrier railing. .

3. The design method for an integrated bridge sound barrier railing according to claim 2, characterized in that, calculate R w When a collision occurs at a standard section of the guardrail, calculate the standard value of the guardrail's first resistance to lateral loads. R w1 ; and the second standard value of the guardrail's resistance to lateral loads, where the collision occurs at the end of the guardrail or at the expansion joint. R w2 Standard value of guardrail resistance to lateral loads .

4. The design method for an integrated bridge sound barrier railing according to claim 3, characterized in that, calculate R w1 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w11 Standard value of lateral load resistance of column (2) when failure occurs. R w12 , ;calculate R w2 Calculate the standard value of the transverse load resistance at mid-span when failure occurs at mid-span. R w21 and the standard value of the lateral load resistance of the column when failure occurs in column (2) R w22 , .

5. The design method for an integrated bridge sound barrier railing according to claim 2, characterized in that, R w The design bending moment of the guardrail concrete (3) regarding the longitudinal axis of the bridge. M C Obtain, calculate M C At that time, first divide the guardrail into sections along the longitudinal direction of the bridge. nu Segment, calculate the first one respectively j Segment bending bearing moment M Cj ,in j ={1,2… nu }, and then according to M Cj Calculate the location of the damage M C .

6. The design method for an integrated bridge sound barrier railing according to claim 2, characterized in that, calculate The design of the integrated bridge sound barrier guardrail, considering the collision occurring at the mid-span of the metal beam (4), is based on the load-bearing capacity. The bearing capacity of the integrated guardrail design for the second bridge sound barrier when the collision occurs at column (2) , .

7. A design method for an integrated bridge sound barrier railing according to any one of claims 1-6, characterized in that, calculate R When the collision damage does not include the end column (2), calculate the design bearing capacity of the beam. R 1; and the design bearing resistance of the crossbeam when collision damage includes the end column (2). R 2. Bearing capacity of the beams of the sound barrier .

8. The design method for an integrated bridge sound barrier railing according to claim 7, characterized in that, calculate R At time 1, calculate the bearing resistance for failure of odd-numbered spans and even-numbered spans respectively, and take the most unfavorable result. R 1.

9. A design method for an integrated bridge sound barrier railing according to any one of claims 1-6, characterized in that, When considering the requirements of coupled wind load and collision load on the overall sound barrier in S4, the column (2) can be used to resist the design bending moment capacity. M collision,available The following formula can be used to obtain: M collision,available = M post M wind in, M post The design bending moment of column (2) M wind The wind load is the design load for the sound barrier.

10. A design method for an integrated bridge sound barrier railing according to any one of claims 1-6, characterized in that, In S2, the spacing of the columns (2) is determined by the design wind load. L Height of column (2) H .

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