中兴大桥桥面板UHPC-超薄磨耗层(SMA)层间性能分析

为避免由于超高性能混凝土(UHPC)与新材料面层的黏结能力较差而引起的层间摩擦滑移造成脱空破损的现象,采用有限元模拟的手段深入研究了粘结剂作用形成组合材料桥面板的层间黏结性能.其黏结性能主要以层间剪应力和法向拉应力来表征,车轮荷载作用于钢桥面板不同位置的受力性能.研究结果表明:UHPC-超薄磨耗层层间剪应力和法向拉应力值会随着车轮加载位置不同而有不同的结果;宁波中兴大桥在各种加载位置下层间剪应力和法向拉应力值均小于实测强度且具有一定的强度储备;随着车轮荷载的增加,层间应力会急剧增加,造成严重的破坏.

Study on Interlayer Performances of UHPC-Ultra Thin Abrasion Layer of Zhongxing Bridge Deck

In order to avoid the phenomenon of void damage caused by the interlayer friction and slip due to the poor bonding ability between ultra-high performance concrete (UHPC) and new material surface, the interlayer bonding performance of composite material bridge deck formed by binder is studied by the means of finite element simulation. The bonding performance is mainly characterized by interlayer shear stress and normal tensile stress. The wheel load acts on the mechanical performances of the steel bridge deck at the different positions. The study result shows that the values of interlayer shear stress and normal tensile stress of UHPC-ultra thin abrasion layer vary with the different wheel loading positions. The values of interlayer shear stress and normal tensile stress of Ningbo Zhongxing Bridge under various loading positions are less than the measured strength and have a certain strength reserve. With the increase of wheel load, the interlayer stress will increase sharply, causing serious damage.