摘要
对适应大型特种飞机的机场水泥混凝土道面的损坏模式、设计标准和厚度计算方法进行研究。明确了大型特种飞机荷载重、起落架复杂的特点;三维有限元分析的结果表明,其多轮叠加效应明显,建议在道面结构设计中考虑全起落架荷载。针对大型特种飞机的特点提出以9块板三维有限元模型作为力学分析模型,以板疲劳断裂作为损坏模式,基于累积损伤原理考虑混合交通。基于Miner原理,给出了累积损伤因子CDF的计算公式,并以CDF接近1(道面达到50%的开裂密度)作为道面设计标准。详细分析了不同机型通行-覆盖率的计算方法,以此为基础形成了各机型预期覆盖次数的计算方法。系统对比了国内外的水泥混凝土道面疲劳方程,建议以美国NCHRP1-26提出的疲劳方程作为现阶段构建水泥混凝土道面设计方法的基础,并进一步明确了允许覆盖次数的计算方法。综合提出了适应大型特种飞机的机场水泥混凝土道面结构设计流程。
This paper is about airport concrete pavement design method for large special aircrafts. Based on 3-D FEM analysis, full landing gear is recommended for pavement design. Considering the characteristics of large special aircrafts, a 3-D FEM model with 9 concrete slabs is employed for pavement design. Fatigue crack is taken as a damage pattern, and a cumulative principle is recommended to consider mixed traffic. Based on Miner ~ principle, the functions of calculating CDF are given. CDF = 1 is accepted as the design criteria of concrete pavement, which indicates 50% crack density. The P/C （pass to coverage ratio） calculation functions are put forwarded for various aircrafts, and the equation for calculating the expected coverage is developed. Various fatigue functions of airport concrete pavement are compared. The functions developed by NCHRP 1-26 are accepted as the fatigue functions to calculate the allowable coverage of pavement. A flow chart of the concrete pavement design is provided.
出处
《土木工程学报》
EI
CSCD
北大核心
2011年第1期121-126,共6页
China Civil Engineering Journal
基金
国家自然科学基金(60776818)
