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首页> 外文期刊>Transportation Research Record >Cost and Performance Comparison of U.S. Overhead Sign Support Structures
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Cost and Performance Comparison of U.S. Overhead Sign Support Structures

机译：美国架空标志支撑结构的成本和性能比较

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Recent developments in fatigue analysis and design of overhead sign support structures prompted AASHTO to update the Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals in 2001. An earlier version of the specification was published in 1994 and, according to recent studies, did not adequately address the issue of fatigue. Updating existing sign support structures to comply with the AASHTO 2001 sign specification may result in a substantial expense to the state departments of transportation nationwide. A method was developed to analyze and evaluate overhead sign support structures for comparison based on cost and performance. The method was then applied to sign support structures across the United States to determine the best performing and most economical designs currently in use. To determine the estimated fatigue life of critical connection details, the evaluation of overhead sign support structure performance was based on dynamic analyses of finite element analysis models. Cost evaluation was based on structure weight and its relative constructability. Performance and cost metrics were combined to establish an optimization parameter, providing a quantitative measure of comparison between overhead sign support structure designs. It is therefore a representation of both effectiveness and economy and, because the performance measure is based on fatigue, it is consistent with current trends in overhead sign support structure design. The method may be used by all state departments of transportation and for all different types of sign support structures.
机译：疲劳分析和高架标志支撑结构设计的最新发展促使AASHTO于2001年更新了《公路标志，灯具和交通信号灯结构支撑标准规范》。该规范的较早版本于1994年发布，根据最近的研究，没有充分解决疲劳问题。更新现有的标志支持结构以符合AASHTO 2001标志规范，可能会导致全国交通运输部门付出巨额费用。开发了一种方法来分析和评估高架标志支持结构，以便根据成本和性能进行比较。然后将该方法应用于整个美国的标志支撑结构，以确定当前使用的最佳性能和最经济的设计。为了确定关键连接细节的估计疲劳寿命，高架标志支撑结构性能的评估基于有限元分析模型的动态分析。成本评估基于结构权重及其相对可构建性。将性能和成本指标进行组合以建立优化参数，从而提供了对架空标志支撑结构设计之间的比较进行量化的度量。因此，它既是有效性又是经济性的代表，并且由于性能度量基于疲劳，因此它与高架标志支撑结构设计的当前趋势一致。该方法可由所有州交通运输部门以及所有不同类型的标志支撑结构使用。

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