中文摘要：

本文对桥面铺装层建立一种分层剪滞模型,并结合线弹性断裂力学研究了混凝土公路桥中桥面板和铺装层组合体受车辆荷载作用下铺装层的破坏问题,求得了某工程实例中新、旧桥面铺装层中裂纹发生扩展时的强度.结果表明,新桥面铺装层（钢纤维增强混凝土）的强度极限明显高于旧桥面铺装层（普通混凝土）的强度极限.

英文摘要：

A layering shear- lag model was established for the bridge overlays. The failure problem of concrete bridge overlays in the system coupled by bridge deck and pavement for concrete highway bridges under vehicle loads was studied by utilizing the model in conjunction with the linear elastic fracture mechanics, and the strengths of new and original bridge overlays for an engineering example were obtained when the crack propagation occurred. The results show that the strength of new bridge overlay （steel fiber concrete） is evidently higher than that of original one （ conventional concrete）.