钢桥面复合铺装结构的大比例模型试验

Large scale Model Test on Mechanics Characteristics of Composite Pavement of Steel Bridge Deck

摘要:

在钢桥面板与沥青铺装层之间设置轻质混凝土层，组成了一种新型钢桥面复合铺装体系.为研究这种新型铺装体系的力学特性，制备了大比例模型试件，实测了不同车位下钢桥面及铺装结构的力学响应.结果表明：钢桥面板最大横向拉应力为90 MPa，而设置加劲肋后最大拉应力降至为43 MPa，即设置加劲肋有利于改善钢桥面板的受力.浇筑轻质混凝土铺装层后，钢桥面板顶板和加劲肋底板的应力峰值、位移都降低，最大应力降幅达48%，最大位移降幅达18%，而且钢桥面板中的应力分布也更加均匀.作为铺装结构，轻质混凝土铺装层也与桥面板共同参与结构受力，使得桥面铺装体系的结构刚度得到提高.

Abstract:

A light weight concrete layer is placed between steel deck slab and asphalt layer to compose a new steel bridge deck pavement system. In order to research the mechanics characteristics of the new deck pavement system, a large scale model is prepared, and the mechanics response of steel deck slab and deck pavement are measured under different vehicle load positions. Results show that the biggest transverse tensile stress of steel deck slab is 90 MPa, but it decreases to 43 MPa after being set the ribbed stiffener, that is to say the ribbed stiffener is useful to improve the load capacity of the steel deck slab. After paving the light weight concrete layer, the maximal stress and displacement of top steel deck slab and bottom ribbed stiffener also decrease. The maximal stress decreasing amplitude is 48%, and the maximal displacement decreasing amplitude is 18%. Meanwhile, the stress distribution of steel deck slab is more uniform. As a pavement layer, the light weight concrete layer jointly participates the load bearing together with the steel deck slab, and the stiffness of the bridge deck pavement system improves.