温度⁃荷载耦合场下机场跑道剩余寿命评价模型

Residual Life Evaluation Model for Airport Runway Under Coupled Temperature⁃Load Fields

针对道面板在飞机荷载与温度耦合场复合作用下的道面寿命问题,首先,通过试验准确测量基于道面板深度的温度分布情况,得出了不同厚度道面板最大温度梯度推荐值,确定了仿真温度场加载参数。然后,在大量仿真试验分析的基础上,开展土基模量、道面板厚度和温差因素对道面板内应力的敏感性影响分析,建立温度应力与温差相关性关系模型,并通过实例验证其有效性。最后,在道面板临界荷位处进行飞机与温度耦合仿真加载试验分析,结果表明温度梯度和飞机荷载共同作用下产生的耦合应力小于温度翘曲应力和荷载应力的叠加之和,两者相差4.93%。基于荷载和温度耦合作用下的应力损伤累积原理,计算道面剩余容许作用次数,构建耦合场下道面剩余寿命评价模型,并进行实例应用。

For the life calculation of pavement under the combined action of aircraft load and temperature coupling field,the recommended values of the maximum temperature gradient of pavement with different thicknesses are obtained through the accurate measurement of the temperature distribution based on the pavement depth.The loading parameters of the simulated temperature field are determined.Based on the analysis of a large number of simulation tests,the sensitivity of soil modulus,pavement slab thickness,and temperature difference factors to the stress on the pavement slab is analyzed.The correlation model between temperature stress and the temperature difference is established,and its effectiveness is verified through examples.The simulation load test analysis of aircraft and the temperature coupling is conducted at the critical load level of the pavement.The results show that the coupling stress generated under the combined action of temperature gradient and aircraft load is less than the sum of temperature warping stress and load stress,with a difference of 4.93%.Based on the principle of stress damage accumulation under the coupling action of load and temperature,the residual allowable number of actions of pavement is calculated,the pavement residual life evaluation model under the coupling field is constructed,and an example is applied to provide a theoretical reference for improving the relevant research in the field of pavement structure design.