台风地区高铁混凝土声屏障单元板试验研究

Experimental research on concrete noise barrier unit plate of high-speed railway in the typhoon areas

轻质高强是混凝土声屏障发展的趋势,其壳体材料选择和结构设计是关键。为解决台风区高速铁路混凝土声屏障容易开裂、变形过大等问题,壳体材料采用钢纤维高性能混凝土。通过理论计算、结构试验并考虑施工因素,制作内空腔无隔板,壳体最小壁厚25 mm的新型声屏障单元板。试验研究表明,背板在8.0 k Pa极限弯矩作用下,单元板没有开裂破损,跨中挠度较小,与有限元分析结果比较吻合。而且单元板自重小,制作方法简单,运输方便,具有良好的抗弯性能,满足台风地区高铁混凝土声屏障的要求。

Lightweight high strength is the trend of the development of the concrete noise barrier, its shell material selection and struc- ture design is the key.In order to solve the problems such as easy cracking and large deformation of concrete noise barriers of the high-speed railway in the typhoon areas,the shell material is made by steel fiber high performance concrete.Through theoretical calcula- tion, test and considering easy pouring construction, making a new noise barrier unit plate without clapboard of internal cavity, and the minimum thickness of noise barrier unit plate shell is selected as 25 mm.According to the test,the unit plate has no crack and the mid-span deformation is small under the ultimate bending moment of the 8.0 kPa on the back plate, compared with the finite element analysis results. This unit plate has the advantages of lightweight, simple manufacture method, convenient transportation and good bending performance, meets the request of the high-speed railway in the typhoon areas.