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首页> 外文期刊>Practice periodical on structural design and construction >Distribution Factors for Short-Haul Vehicular Loads on Prestressed Concrete Open Box Beam (U-Beam) Bridges
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Distribution Factors for Short-Haul Vehicular Loads on Prestressed Concrete Open Box Beam (U-Beam) Bridges

机译：预应力混凝土开箱梁（U形梁）桥上短程车辆荷载的分布系数

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The design and analysis of a bridge system is a complicated task. In order to simplify the design process, it is necessary to break the system into smaller, less complex, and more manageable subsystems. The AASHTO load-and-resistance factor design (LRFD) bridge design specifications provide the design methods and procedures to design the bridge components explicitly and on an individual basis. In particular, the AASHTO LRFD bridge design specifications employs the beam-line method or distribution factor method to reduce the spatial dimensionality of bridge structures into line elements. The distribution factor is used to modify the load effects determined from the beam-line analysis to account for the effects at other locations in the structure. The published vehicular design loads adopted by the AASHTO LRFD bridge design specifications are considered to be an "average design truck." The average design truck loads exclude vehicles that are above the legal weight limits for the United States, but are regularly allowed to operate on the U.S. highway systems. These loads are short-haul vehicles such as solid waste trucks, aerial rescue fire trucks and concrete mixers. The most common type of bridge in the United States is the slab-girder bridge system. The principal function of the slab-girder bridge is to provide a roadway surface and transmit the applied loads of the roadway to the girder system supporting the roadway. This research examines the loading effects of the short-haul vehicular loads on a typical prestressed concrete open box beam (U-beam) bridge. This study consists of analytically determining the distribution factors of special vehicles such as, a concrete mixer, a solid waste truck, and an aerial fire rescue truck, and comparing the results to distribution factors recommended in the AASHTO LRFD bridge design specifications.
机译：桥梁系统的设计和分析是一项复杂的任务。为了简化设计过程，有必要将系统分解为更小，更简单，更易于管理的子系统。 AASHTO负载和阻力因数设计（LRFD）桥设计规范提供了设计方法和过程，可以明确地和单独地设计桥组件。特别是，AASHTO LRFD桥梁设计规范采用梁线法或分布因子法来减小桥梁结构成线元的空间尺寸。分配因子用于修改从梁线分析确定的载荷效应，以考虑结构中其他位置的效应。 AASHTO LRFD桥梁设计规范采用的已发布的车辆设计载荷被认为是“平均设计卡车”。设计卡车的平均载重量不包括超过美国法律规定的重量限制但定期在美国高速公路系统上行驶的车辆。这些负载是短途车辆，例如固体垃圾车，空中救援消防车和混凝土搅拌机。在美国，最常见的桥梁类型是板梁桥系统。平板-梁桥的主要功能是提供道路表面，并将施加的道路载荷传递到支撑道路的梁系统。这项研究研究了短程车辆荷载对典型的预应力混凝土开箱梁（U形梁）桥的荷载作用。这项研究包括分析确定特殊车辆（例如混凝土搅拌机，固体垃圾车和空中消防车）的分配系数，并将结果与​​AASHTO LRFD桥梁设计规范中建议的分配系数进行比较。

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