温度翘曲应力对机场刚性道面寿命的影响

分析了目前中国民航机场刚性道面的设计过程,指出在设计过程中忽视温度应力的影响不合理。参照公路水泥混凝土路面温度应力计算方法并根据Miner定律研究了温度翘曲疲劳损耗对于机场刚性道面影响规律,即温度翘曲疲劳损耗随板厚、地基反应模量的增大而增大,随着混凝土设计强度的增加而降低。然后提出采用设计寿命的影响因子nt/Nt评价温度翘曲疲劳损耗对于机场刚性道面设计寿命影响的方法并提供了相应的机场刚性道面板厚度设计流程图。最后提供了一个考虑温度翘曲应力的刚性道面设计实例,为工程应用提供参考。

Influence of thermal warping fatigue on airport rigid pavement life

The rigid pavement design process currently used in China is analyzed and the defect of ignoring thermal warping stress is pointed out.Then refer to the thermal warping stress determination technique of cement concrete pavement in freeway and the Miner principle,the influence of thermal warping fatigue to the airport rigid pavement is studied,which show the thermal warping fatigue impaction increases with the thickness of pavement slab and subgrade resilience modulus and decreases with the strength of concrete.Then a parameter,pavement life impact factor,is proposed to evaluate the thermal warping fatigue effect to the airport rigid pavement and the pavement slab thickness design process diagram is provided.At last an design example is provided in which thermal warping stress is considered which may has certain reference value in engineering practice.