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首页> 外文期刊>Journal of bridge engineering >Agricultural Vehicle Load Distribution for Timber Bridges
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Agricultural Vehicle Load Distribution for Timber Bridges

机译：农用车木桥的负荷分配

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摘要

Agricultural or farm vehicles with various configurations and weights are frequently driven over timber bridges on secondary road-ways in the United States. Lateral live-load distribution factors (LLDFs) for these bridges loaded with farm vehicles are not well known. Further, the effects associated with farm vehicles have not been considered in the current AASHTO specifications that solely provide codified formulas to calculate LLDFs of timber girders. To estimate the timber-girder LLDFs more explicitly, three multispan timber-girder bridges in Iowa were selected, and LLDFs for each of girder were determined on the basis of various methods, including codified processing, field testing, simulation, and statistical analysis. For field LLDFs, the bridges subjected to four farm vehicles were tested and a roadway semitruck was used as a reference for determining roadway-vehicle load characteristics. As part of analytical LLDF investigation, analytical models of the bridges were generated and calibrated with field data using finite-element analysis (FEA) software. To consider the effects of farm vehicles with vastly different features, configurations of approximately 121 different farm vehicles were gathered and used as applied loads in the FEA models to determine analytical LLDFs per bridge. The analytical LLDFs were used to create LLDF limits for each bridge in a statistical manner. The resulting LLDFs were compared to those determined from the codified formulas, showing that the AASHTO LLDFs were, in specific cases, insufficiently conservative for the bridges studied. (C) 2017 American Society of Civil Engineers.
机译：在美国，具有各种配置和重量的农用或农用车辆经常在木桥上行驶。这些装有农用车辆的桥梁的侧向活荷载分配系数（LLDF）尚不为人所知。此外，在当前的AASHTO规范中未考虑与农用车辆相关的影响，该规范仅提供用于计算木梁LLDF的编纂公式。为了更明确地估计木梁的LLDF，在爱荷华州选择了三座多跨木梁桥，并根据各种方法确定了每个梁的LLDF，包括编码处理，现场测试，模拟和统计分析。对于野外LLDF，测试了四辆农用车辆承受的桥梁，并将道路半卡车用作确定道路车辆载荷特性的参考。作为分析LLDF研究的一部分，使用有限元分析（FEA）软件生成了桥梁的分析模型，并用现场数据进行了校准。为了考虑功能迥异的农用车辆的影响，收集了大约121种不同的农用车辆的配置，并将其用作FEA模型中的应用载荷，以确定每座桥梁的分析LLDF。分析的LLDF用于以统计方式为每个桥梁创建LLDF限值。将所得的LLDF与根据编码公式确定的LLDF进行了比较，表明AASHTO LLDF在特定情况下对于所研究的桥梁而言不够保守。 （C）2017年美国土木工程师学会。

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  • 来源
    《Journal of bridge engineering》 |2017年第11期|04017085.1-04017085.10|共10页
  • 作者

    Seo Junwon; Kilaru Chandra Teja; Phares Brent; Lu Ping;

  • 作者单位

    South Dakota Univ, Dept Civil & Environm Engn, Brookings, SD 57007 USA;

    Iowa State Univ, Dept Civil Construct & Environm Engn, Ames, IA 50011 USA;

    Iowa State Univ, Bridge Engn Ctr, Ames, IA 50011 USA;

    Iowa Dept Transportat, 800 Lincoln Way, Ames, IA 50010 USA;

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