CN-122020797-A - Design method suitable for bridge sound barrier integrated guardrail

CN122020797ACN 122020797 ACN122020797 ACN 122020797ACN-122020797-A

Abstract

The application relates to the technical field of traffic safety facilities, in particular to a design method of an integrated guardrail applicable to a sound barrier of a bridge, which comprises the following steps of determining the protection grade of the guardrail; according to the use environment of the bridge sound barrier integrated guardrail, wind pressure and height are determined, the design wind load of the sound barrier is calculated, the size of the stand column and the steel model are primarily determined according to the design wind load, the design collision load of the bridge sound barrier integrated guardrail is calculated according to the structure of the bridge sound barrier integrated guardrail, the design wind load and the design collision load are coupled, whether the bridge sound barrier integrated guardrail meets the design requirement is checked, and the design of the bridge sound barrier integrated guardrail is completed. The application systematically solves the problem of missing of the method for cooperatively designing the sound barrier and the guardrail, overcomes the secondary injury risk caused by the stumbling effect of the traditional bridge sound barrier upright post when the vehicle is out of control and collides in the prior art, and improves the safety compatibility of protective facilities.

Inventors

ZHAO LIANG
YUAN KANG
KANG ZHIWEN
SHEN LINLIN
LI BING
YANG DONGRUI
LI JUN
ZHANG YI
ZHANG HONGSONG
YANG XIAODONG
JING BO
WANG BUGAO
LI JINRUI
LI DEJUN
ZHOU QUN
WANG BOXING
DAI CHEN

Assignees

中交第一公路勘察设计研究院有限公司
西安金路交通工程科技发展有限责任公司
深圳高速公路集团股份有限公司
深圳高速建设发展有限公司
北京中交华安科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. The design method of the integrated guardrail applicable to the sound barrier of the bridge is characterized by comprising the following steps of: s1, determining the protection grade of a bridge sound barrier integrated guardrail; s2, calculating the design wind load of the sound barrier according to the use environment of the integrated guardrail of the bridge sound barrier, and primarily determining the size of the upright post (2) and the type of steel according to the design wind load; S3, calculating the design collision load of the bridge sound barrier integrated guardrail according to the structure of the bridge sound barrier integrated guardrail; s4, coupling design wind load and design collision load, checking whether the bridge sound barrier integrated guardrail meets the design requirement, and completing the design of the bridge sound barrier integrated guardrail.
2. The method for designing the integrated guardrail applicable to the bridge sound barrier according to claim 1, wherein in the step S3, when the designed collision load of the integrated guardrail of the bridge sound barrier is calculated, a standard resistance value R w and a designed bearing resistance R of a cross beam of the guardrail concrete (3) against transverse load are calculated respectively, and then the designed bearing capacity of the integrated guardrail of the bridge sound barrier is calculated 。
3. The method of claim 2, wherein R w is calculated as a standard value R w1 of a first resistance of the guardrail against a transverse load and R w2 of a second resistance of the guardrail against a transverse load are calculated as a standard value R w1 of a second resistance of the guardrail against a transverse load and a standard value R of a resistance of the guardrail against a transverse load when the collision occurs in the standard section of the guardrail and the collision occurs at the end portion or the expansion joint of the guardrail 。
4. The method for designing an integrated guardrail for a sound barrier of a bridge according to claim 3, wherein when R w1 is calculated, a standard value R w11 of the transverse load resistance of the midspan when the damage occurs in the midspan and a standard value R w12 of the transverse load resistance of the upright post (2) when the damage occurs in the upright post (2) are calculated respectively, When R w2 is calculated, a standard value R w21 of the mid-span transverse load resistance when the damage occurs in mid-span and a standard value R w22 of the upright post transverse load resistance when the damage occurs in the upright post (2) are respectively calculated, 。
5. The method for designing the integrated guardrail applicable to the sound barrier of the bridge according to claim 2, wherein R w is obtained by designing bending bearing moment M C of the guardrail concrete (3) about the longitudinal axis of the bridge, when M C is calculated, the guardrail is divided into nu sections along the longitudinal bridge, bending bearing moment M Cj of the j sections is calculated respectively, wherein j= {1, 2..nu }, and then M C is calculated according to M Cj and the damage occurrence position.
6. The method for designing an integrated barrier for a sound barrier of a bridge according to claim 2, wherein the method comprises the steps of Design bearing capacity of first bridge sound barrier integrated guardrail respectively considering collision occurring in midspan of metal cross beam (4) Design bearing capacity of second bridge sound barrier integrated guardrail when collision occurs on upright post (2) , 。
7. The method of claim 1-6, wherein R is calculated by calculating the beam design load resistance R 1 when the collision damage does not include the end post (2), and R 2 is calculated by calculating the beam design load resistance when the collision damage includes the end post (2), and the beam load resistance of the sound barrier 。
8. The method of claim 7, wherein R 1 is calculated to calculate the load resistance to damage to odd spans and even spans, respectively, with the least favorable result being R 1 .
9. The method for designing an integrated guardrail for a sound barrier of a bridge according to any one of claims 1 to 6, wherein when the coupling wind load and the collision load in S4 are required for the whole sound barrier, the design bending moment capacity M collision,available of the upright post (2) for resisting is obtained by the following formula: M collision,available =M post M wind Wherein M post is the design bending load moment of the upright post (2), and M wind is the design wind load of the sound barrier.
10. The method for designing the integrated guardrail applicable to the sound barrier of the bridge according to any one of claims 1 to 6, wherein the distance L between the upright posts (2) and the height H of the upright posts (2) are determined in S2 through the design wind load.

Description

Design method suitable for bridge sound barrier integrated guardrail Technical Field The invention relates to the technical field of traffic safety facilities, in particular to a design method of an integrated guardrail applicable to a sound barrier of a bridge. Background With the rapid development of urban traffic networks, double-layer highway bridges have become key technical means for relieving land resource shortage and optimizing road network layout, but upper-layer driving noise forms serious invasion to surrounding environment, and a sound barrier becomes necessary noise reduction facility. Meanwhile, bridge guardrails are important safety measures for highways. According to the relevant specifications, the sound barrier design does not take into account the impact of the vehicle, so that the corresponding impact force of the vehicle should take into account other measures. Impact to a runaway vehicle cannot be resisted by the sound barrier structure, and a metal crash barrier is provided in front of the sound barrier structure to avoid impact of the runaway vehicle. In order to reduce the types of foundation types of facilities such as falling prevention nets, sound barriers, lamp poles and the like, the integrated design of bridge guardrails and related facility foundations is preferably adopted from the aspects of construction convenience, maintenance convenience and facility life-span cost saving. When the sound barrier is combined with the concrete guardrail, the sound barrier upright post is an obstacle, and when the out-of-control vehicle is inclined, the sound barrier upright post is easy to strike, and the sound barrier upright post is blocked, so that the casualties are caused. In order to avoid the influence of the sound barrier to the safety performance of the guardrail, the guardrail at the upright post of the sound barrier is reasonably arranged, the construction convenience and the maintenance convenience of the sound barrier are considered, and the bridge guardrail and the sound barrier collaborative protection system are provided, the sound barrier is arranged at the top of the concrete base, and the sound barrier and the guardrail are made into a collaborative stressed anti-collision system, so that the problem of stumbling of the upright post during vehicle collision is effectively avoided. Disclosure of Invention The invention aims to overcome the defect of secondary damage risk caused by the stumbling effect of a traditional bridge sound barrier upright post when a vehicle is out of control and collides in the prior art, and provides a design method suitable for a bridge sound barrier integrated guardrail. In a first aspect, the present invention provides a design method for a sound barrier integrated guardrail of a bridge, including the following steps: s1, determining the protection grade of a bridge sound barrier integrated guardrail; s2, calculating the design wind load of the sound barrier according to the use environment of the integrated guardrail of the bridge sound barrier, and primarily determining the size of the stand column and the type of steel according to the design wind load; S3, calculating the design collision load of the bridge sound barrier integrated guardrail according to the structure of the bridge sound barrier integrated guardrail; s4, coupling design wind load and design collision load, checking whether the bridge sound barrier integrated guardrail meets the design requirement, and completing the design of the bridge sound barrier integrated guardrail. The guard rail HAs protection levels of HA, HB, SS, SA, SB, A, B and C. The protection level of the bridge guardrail is determined from two aspects, namely the use condition of the bridge, namely the common bridge and the bridge crossing expressways, rail traffic or the road sections of the cited water source protection areas and the like, and the design speed of the bridge, and particularly, the related specification. According to the design wind load of the sound barrier, the horizontal displacement of the top point of the upright post, the bottom bending moment of the upright post and the bottom axial force of the upright post are listed, wherein the horizontal displacement of the top point needs to be smaller than or equal to a corresponding threshold value, the section strength and the shearing strength of the upright post are listed through the bottom bending moment of the upright post and the bottom axial force of the upright post, and the section strength and the shearing strength of the upright post need to be smaller than or equal to a corresponding threshold value, so that the size and the steel model of the upright post are determined according to the relation, and then the design collision load of the integrated guardrail of the bridge sound barrier is calculated. The design collision load of the bridge sound barrier integrated guardrail comprises the design collision load of guardrail conc