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Use of NDE Methods for Load Rating of Older Structures

机译：使用NDE方法进行旧结构的负载等级

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Load rating is carried out on all bridge structures to ensure that they have the capacity to support the expected vehicular loads, or to appropriately restrict the vehicular loading on older and/or distressed structures by posting load limits. For many of these older structures, including culverts, concrete and stone arches and precast girder bridges, design or as-built plans are no longer available to serve as a reference for the load rating analysis calculations. In these situations, NDE methods are often useful to fill in such missing data as element thickness, depth of overburden (culverts and arches), rebar depth and spacing, and estimated concrete strength. Over the past few years, Mass DOT has used these techniques to support load ratings on a number of structures. The paper describes the types of structures that have been investigated, the NDE methods used, the data that was obtained and the methods of analysis, and the resulting information generated for the load rating process.
机译：在所有桥梁结构上进行负载额定值，以确保它们具有支撑预期车辆载荷的能力，或者通过发布负载限制来适当地限制较旧的和/或遇险结构上的车辆负载。对于许多这些较旧的结构，包括涵洞，混凝土和石拱和预制梁桥，设计或建造计划不再可用作负载评级分析计算的参考。在这些情况下，NDE方法通常可用于将这种缺失的数据填充为元素厚度，过度覆盖（涵洞和拱形），钢筋深度和间距以及估计的混凝土强度。在过去几年中，大众点使用这些技术来支持许多结构的负荷额定值。本文描述了已被研究结构的类型，所使用的NDE方法，获得的数据和分析的方法，以及用于负载等级处理生成的结果信息。

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