混凝土桥面复合式铺装层受力分析和设计

Mechanic analysis and design of composite type overlay on concrete bridge pavement

选取典型的T梁和箱梁桥型,将桥梁体、水泥混凝土铺装层、防水层、沥青混凝土铺装层视作一个整体,研究了复合式桥面铺装在承受汽超-20偏载作用下的结构响应。采用有限元方法进行三维空间实体建模,分析了铺装层受力最不利位置、铺装层拉应力、层间剪应力和层间法向拉应力。结果表明:桥梁体、水泥混凝土铺装层、防水层和沥青混凝土铺装层相互作用,在桥梁结构特殊部位产生铺装层最大拉应力,在轮载作用域产生最大层间应力;铺装层厚度对荷载应力大小有重要影响。提出了复合式铺装的设计指标,建议沥青混凝土铺装层和水泥混凝土铺装层厚度的设计采用复合式结构。

This paper analyzed the structure response of composite type overlay on typical T-Beam and Box-Beam bridges under traffic loading when the bridge structure, Asphalt Concrete （AC） overlay, Portland Cement Concrete （PCC） overlay, and waterproof interlay were considered as a continuous system. The 3D finite element method was used to study the critical stress position, the overlay tensile stress, interface shear stress and interface normal tensile stress. The results indicate that the bridge, PCC overlay, waterproof interlay, and AC overlay affect each other significantly, and the maximum overlay tensile stress appears at the critical position of bridges, the maximum interface stress raises at the tire loading area, and the overlay thickness has important influence on the stress magnitude. The design criteria for the composite type overlay on concrete bridges were proposed, and reasonable thickness components of AC and PCC overlay was suggested. 6 tabs, 12 figs, 12 refs.