基于桥侧护栏形式的中央分隔带护栏结构设计及优化研究

摘要

针对汝郴高速赤石特大桥采用了"人本型"高防护等级桥梁景观钢护栏,若为了整体景观效果而采用与桥侧护栏一致的结构,则会产生材料浪费.从景观效果、防护能力、造价等方面考虑采用人字形立柱加双侧横梁的结构形式,并采用有限元仿真对护栏结构进行优化,最终确定的中央分隔带横梁结构中上部横梁尺寸为120 mm长×160 mm宽×6 mm厚,中间和下部横梁尺寸为120 mm长×160 mm宽×4 mm厚,其余与路侧护栏采用相同的结构形式.并采用有限元仿真验证了结构的阻挡、导向功能符合相关规范要求,通过比较车辆碰撞路侧护栏和中央分隔带护栏后的护栏最大变形值得出中央分隔带护栏强度不低于路侧护栏的结论,并可以应用于工程实际中.%The high protection grade steel barrier on the Chishi Bridge of the Ruchen Highway adopt the "people oriented" landscape.If other sections adopt the same structural style would produce unnecessary waste.In consideration of the landscape, containment performance, manufacturing cost, the median barrier structure adopt herringbone column and beams on each side, and use the finite simulation to optimize structure.Results show that the top beam size is 120 mm×160 mm×6 mm,the middle and bottom beams size is 120 mm×160 mm×4 mm,the rest structures remain the same.Use the finite element simulation to verify whether the containment and redirective performance comply with the standard requirements, by comparing maximum dynamic widening distance of lateral deflection of the roadside barrier and the median barrier concluded that the strength of the median barrier no less than that of the roadside barier, and it can be applied in engineering practice.