中文摘要：

为研究重载交通条件下RC板桥的抗裂性能，以煤运干线宣大高速公路某大桥所采集的动态称重（WIM）数据为基础，提取出883个特重车荷载工况，借助自主研发的三维动力可视化分析软件BDANS计算特重车荷载工况作用下RC板桥的正弯矩效应，并按照现行桥梁规范的裂缝宽度计算方法计算每个特重车工况作用下RC板桥跨中截面的裂缝宽度。结果表明：RC板桥跨中截面的裂缝宽度均介于0．1～0．2mm之间，未超越现行桥梁规范所规定的最大裂缝宽度，但该类型裂缝的存在将为混凝土碳化、钢筋的电化学腐蚀提供有利的发生环境；为保证结构的正常使用并延长其服役期，应对已有裂缝进行修复处理并对公路桥梁车辆荷载进行限载研究。

英文摘要：

In order to study the crack resistance of RC slab bridge under heavy traffic, 883 extraheavy truck cases were extracted from the Xuanda highway Weigh-in-motion （WIM） data, which was used for coal transportation. The sagging moment effect of RC slab bridge under the extra- heavy truck cases was calculated by self-developed three-dimensional analysis software BDANS. Furthermore, the crack widths of mid-span section of RC slab bridge were achieved according to the realizing method which was listed in current bridge standard. The results show that the crack width of mid-span section of RC slab bridge caused by extra-heavy truck is within the scope of 0.1-0.2 mm and it does not exceed the maximum crack width of the relevant provisions. While the existing of these cracks will provide an ideal circumstance for the carbonation of concrete and electrochemical corrosion of the rebar. In order to ensure the serviceability and extend the service period of structures, some preliminary repairs for the cracks and study on vehicle load limitation of highway bridges should be done.