基于屈服线理论的组合式防撞护栏设计及验算分析  

Design and Calculation Analysis of Combined Crash Barrier by Yield Line Theory

作　　者：卫德刚 Wei Degang(Beijing Guodaotong Highway Design&Research Institute Co.,Ltd.,Beijing 100073,China)

机构地区：[1]北京国道通公路设计研究院股份有限公司,北京100073

出　　处：《市政技术》2023年第7期65-70,76,共7页Journal of Municipal Technology

摘　　要：在JTG/T D81—2017《公路交通安全设施设计细则》中,提出了混凝土护栏基于塑性理论的屈服线设计方法,其与以往基于弹性理论的悬臂梁设计方法相比,护栏设计的理论基础和计算流程均发生了较大变化,使原护栏构造在新设计方法下需要进行相应的优化。因此,结合设计实例,对组合式护栏采用屈服线设计方法进行防撞验算,分析了混凝土护栏屈服线设计原理、组合式护栏以及桥面板悬臂防撞验算过程,揭示了屈服线设计方法在应用中的技术要点,提出基于塑性理论的防撞设计应将护栏与基础桥面板看成一个整体,以避免因护栏本体防撞能力过强而导致桥面板的过度设计。In JTG/T D81-2017 Guidelines for Design of Highway Safety Facilities,the yield line design method of concrete guardrail based on plastic theory is proposed.Compared with previous cantilever beam design methods based on elastic theory,its theoretical basis and calculation process of guardrail design have significant changed,which require corresponding optimization of the original guardrail structure.Therefore,combined with the design examples,the yield line design method was used for anti-collision calculation of composite guardrails.The design principle of the yield line for concrete guardrails,the process of anti-collision calculation for composite guardrails and bridge deck cantilever were analyzed.The technical points of the yield line design method in application were revealed.Based on plastic theory,the guardrail and the foundation bridge deck should be a whole in the anti-collision design to avoid excessive design of the bridge deck due to the strong anti-collision ability of the guardrail body.

关 键 词：组合式护栏 屈服线理论 护栏验算 桥面板 

分 类 号：U443.7[建筑科学—桥梁与隧道工程]