大跨径钢箱梁桥面铺装动力响应分析

为了分析钢桥面铺装在动荷载作用下的力学变化规律，针对现有铺装层常见的脱层、滑移、开裂等破坏形式，研究了行车荷载的动力特性与形式，将车轮荷载模拟为移动恒载，选取了6种铺装结构和3种力学控制指标，建立了钢桥面铺装体系三维有限元模型，研究了在动荷载作用下铺装的动力响应，并与静力计算结果进行了对比，给出了最优的铺装结构形式。分析表明，钢桥面铺装的动力响应与静力响应有较大的不同；在动力荷载下，铺装层最不利受力荷位是横隔板跨中位置；铺装层最不利点位受拉情况类似于承受半正矢波荷载；静力分析在对层间剪应力计算时误差很大，在动力荷载作用下，铺装与钢板间会产生很大的层间剪应力，这是导致铺装出现脱层、滑移等病害的主要原因。

Analysis of Dynamic Response of Deck Pavements for Long-span Steel Box Girder Bridge

Aiming at the common damages of steel bridge deck pavements, such as pushing, slippage, cracking and so on, dynamic characteristic and shapes of traffic loads are analyzed. By simulating wheel loads as moving dead loads, dynamic responses of six types of pavement system subject to moving loads are investigated using finite element method and three michanical indexes, and the results are compared with the static one, thus the optimal structure is given.Analysis results show that dynamic responses of deck pavements are different from the static ones. The worst load position is on the mid-span of two transversal diaphragms. The traffic loads on the pavements mostly like half-sinusoid loads.The obvious errors exist in the statistic calculations of the shear stress between deck and pavement, and larger shear force between deck and pavement caused by dynamic loads is the main reason of damage types of pushing and local packing.