高速铁路大风地区挡风结构破坏性试验研究

Destructive Test Study of Wind-break Structure Along High Speed Railway in Gale Area

为研究由挡风立柱和挡风板组成的挡风结构在大风作用下的破坏情况,在现场用混凝土浇筑1∶1挡风结构模型,并对其进行静力加载试验,进而对挡风结构的裂缝发展规律和混凝土应力、钢筋应力、承载力等基本受力性能展开研究。试验结果表明,最大破坏荷载随挡风立柱高度的增加而减小,挡风立柱高度为3.5 m时承受的破坏荷载最大;长厚比越大挡风板所承受的最大破坏荷载越大,挡风板厚度为0.15 m时承受的破坏荷载最大;选用立柱高3.5 m、挡风板厚0.15 m的组合结构满足使用与安全要求,有较大的安全储备。

The wind-break structure is composed of wind column and wind shield. In order to study the damage of the wind-break structure under gade,the 1∶ 1 wind-break structure model of concrete casting was used in the field. And the static loading test of the model was carried out to study the basic mechanical behaviors,such as crack development law,concrete stress,steel stress,and bearing capacity. The test results showthat with the increase of the height of wind column,the maximum damage load decreases. When the wind column height is 3. 5 m,the damage load is the largest.With the increase of the length to thickness ratio,the maximum damage load increases. When the wind shield thickness is 0. 15 m,the damage load is the largest. The combination structure of column height 3. 5 m and wind shield thickness0. 15 m has a larger security reserve to meet safety requirements.