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Live Load Distribution Factors for a Short Span Timber Bridge under Heavy Agricultural Vehicles

机译：重型农用车辆短跨度木桥的活荷载分配系数

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The American Association of State Highway and Transportation Officials (AASHTO) Specifications provide simplified formulas to determine Live Load Distribution Factors (LLDFs) for timber girder bridges with timber decking. The AASHTO formulas have been developed based upon the parametric study for timber bridges subjected to typical highway vehicles. However, the majority of short span timber bridges are located on secondary roadways where agricultural vehicles often operate. These vehicles have more vastly different configurations and weights relative to highway vehicles; thus, they can result in more different LLDFs than highway vehicles. Hence, the focus of this study is on the investigation of agricultural vehicle induced LLDFs for a short span timber bridge with timber decking through field tests, simulations, and AASHTO-based codified methods. The bridge was tested with four heavy agricultural vehicles and a highway truck. Commercially available finite element analysis (FEA) software was used to generate an analytical model of the bridge. The model was refined with field data to replicate field responses and analytical LLDFs of the bridge. To account for uncertainties in agricultural vehicle parameters, a large number of agricultural vehicles with different characteristics in use in the United States were used as input loads in the model. Field and analytical LLDFs were compared to those obtained from the AASHTO-based codified methods. Findings indicated that the field and analytical LLDFs for most girders occasionally exceeded the AASHTO codified values.
机译：美国国家公路和运输官员协会（AASHTO）规范提供了简化公式，用于确定具有木地板的木梁桥梁的活荷载分配系数（LLDF）。 AASHTO公式是根据对典型公路车辆使用的木桥的参数研究得出的。但是，大多数短跨度的木桥都位于农用车辆经常行驶的次要道路上。与公路车辆相比，这些车辆的配置和重量差异更大。因此，与公路车辆相比，它们可以产生更多的LLDF。因此，本研究的重点是通过田间试验，模拟和基于AASHTO的编纂方法，对带有木材铺面的短跨度木桥的农用车辆引起的LLDF进行研究。该桥用四辆重型农用车和一辆公路卡车进行了测试。使用市售的有限元分析（FEA）软件来生成桥梁的分析模型。使用现场数据对模型进行完善，以复制现场响应和桥梁的分析LLDF。为了解决农用车辆参数的不确定性，在模型中使用了美国使用的许多具有不同特性的农用车辆作为输入负载。将实地和分析性LLDF与从基于AASHTO的编码方法获得的LLDF进行了比较。研究结果表明，大多数大梁的野外和分析性LLDF偶尔会超过AASHTO编纂的值。

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