节地美观型中央分隔带护栏设计与评价

Design and Evaluation of Land-Saving and Beautiful Median Barriers

高速公路和国省干道在新建及改扩建过程中,对中央分隔带护栏提出了更加多样化的需求,包括防护性能可靠、占地空间小、美化交通环境及造价经济,但现有中央分隔带护栏成果尚有不完备之处。为了更好地满足公路中央分隔带护栏的设计与使用需求,该文采用理论分析、计算机仿真和实车足尺碰撞试验相结合的技术手段,分析了不同类型中央分隔带护栏的受力特点,提出梁柱一体式设计新理念,并通过护栏高度、宽度、横梁、立柱及基础等结构系统研究,得到节地美观型中央分隔带护栏成果。所得中央分隔带护栏研究成果的防护能力达到SAm级,整体宽度50 cm可节省建设用地,梁柱一体式结构景观更通透,材料用量少,造价更经济,综合性能较为优异。

During the construction and expansion of expressways and national and provincial highways,more diversified requirements have been put forward for the median barrier,including reliable protective performance,small footprints,beautiful traffic environments,and economic costs.However,the existing median barrier achievements still have some shortcomings.In order to better meet the design and use needs of median barriers for highways,theoretical analysis,computer simulation,and full-scale impact tests with real vehicles were adopted,and the force characteristics of different types of median barriers were analyzed.A new design concept of beam-column integration was put forward.Through systematic research on the barrier height,width,beam,column,foundation,and other structures,a land-saving and beautiful median barrier was developed.The median barrier had a protective performance at SAm level and an overall width of 50 cm.It could save construction land,and the single beam-column integrated structure enabled a more penetrating landscape,required less material consumption,and made the cost more economical,with excellent comprehensive performance.