机场柔性道面结构的飞机当量单轮荷载

Equivalent Single Wheel Load of Airport Flexible Pavement Structures

通过引入机场柔性道面结构的飞机当量单轮荷载系数ζ和旁邻轮影响系数φ;明确了当量单轮荷载的概念和计算公式。分别基于结构层层底弯拉应力、应变和土基顶面压应变设计指标,分析了主起落架构型分别为双轮、双轴双轮和三轴双轮的飞机当量单轮荷载系数ζ随机场道面结构参数的变化规律。研究表明:计算沥青面层层底弯拉应变,刚性、半刚性基层层底弯拉应力的当量单轮荷载系数ζ时仅考虑计一根(或一排)轴载的影响;计算土基顶面压应变的ζ时可计入所有旁邻轮的影响。最后,给出了基于结构层层底弯拉应力、应变和土基顶面压应变的40余种飞机的当量单轮荷载系数ζ的近似回归公式。

In this paper,aircraft equivalent single wheel load coefficientζand adjacent wheel effect coefficientφof airport flexible pavement structures are introduced,and the concepts and formula expressions of equivalent single wheel load are defined.Calculation methods ofφandζare introduced.Based on flexural tensile stress,strain at the bottom of structure layer and compressive strain on top of sub-grade,the rule ofζwith pavement structure parameters is analyzed when the main landing gear configuration of aircraft is dual wheel,dual tandem wheel or three axis wheel respectively.The paper suggests that in calculatingζof flexural tensile strain at the bottom of asphalt layer and of flexural tensile stress at the bottom of rigid or semi-rigid base,the only one axle（or a row）load should be considered,and in calculating compressive strain on top of sub-grade,all adjacent wheels should be considered.At last,the approximate formulas of equivalent single wheel load coefficient for more than 40 kinds of aircraft based on flexural tensile stress,strain at the bottom of structure layer and compressive strain on top of sub-grade are given.