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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >Material Equivalence for Flexible Aircraft Pavement Thickness Design
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Material Equivalence for Flexible Aircraft Pavement Thickness Design

机译：柔性飞机路面厚度设计的材料等效性

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摘要

Material equivalence is the thickness of one pavement material which could be replaced by a different thickness of another pavement material to result in the same structural pavement capacity. The Federal Aviation Administration of the USA (FAA) pavement design guide provides ranges for equivalence factors for crushed rock base course, uncrushed gravel sub-base, asphalt and other pavement materials. These factors are commonly used to convert thicknesses of 'standard' pavement structures to equivalent thicknesses of alternate pavement compositions. The FAA provided ranges of equivalence are broad and most designers tend to utilise the mid-ranges values. When converted pavement thicknesses (using the mid-range FAA values) are compared to pavement thicknesses derived directly from the layered elastic design tool Aircraft Pavement Structural Design System (APSDS) there is a significant discrepancy, especially as the pavement structure moves further away from the 'standard' pavement composition. For medium to large aircraft, the equivalence factors which would be required to provide consistence with APSDS lie at the lower end of the FAA ranges. They are 1.3 for Asphalt in place of Crushed Rock, 1.2 for Crushed Rock in place of Uncrushed Gravel and 1.6 for Asphalt in place of Uncrushed Gravel. The FAA should consider revising the material equivalence values within their design guide in light of these findings. Some variability exists within the APSDS implied equivalences. Both the location of the replacement material in the pavement structure and the portion of the pavement thickness being replaced, significantly affect the equivalence implied by the layered elastic tool.
机译：等效材料是一种路面材料的厚度，该厚度可以被另一种路面材料的不同厚度替代，以产生相同的结构路面容量。美国联邦航空管理局（FAA）的路面设计指南提供了碎石基层，未碎石子基层，沥青和其他路面材料的当量系数范围。这些因素通常用于将“标准”路面结构的厚度转换为替代路面组合物的​​等效厚度。 FAA提供的等效范围很广，大多数设计人员倾向于使用中间范围的值。当将转换后的路面厚度（使用中值FAA值）与直接从分层弹性设计工具飞机路面结构设计系统（APSDS）得出的路面厚度进行比较时，会有很大的差异，尤其是当路面结构逐渐远离路面时“标准”路面组成。对于中型和大型飞机，与APSDS保持一致所需的当量系数位于FAA范围的下限。它们是碎石代替沥青的1.3，碎石碎石的1.2，碎石碎石的1.6。 FAA应该根据这些发现，考虑在其设计指南中修改材料等效值。 APSDS隐含的等效性中存在一些可变性。替换材料在路面结构中的位置以及路面厚度的一部分被替换，都极大地影响了分层弹性工具所隐含的等效性。

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