ABSTRACT

This paper quantifies the relevance of restriction to joint rotation of an airfield concrete pavement when calculating critical curling stresses and deflections using a validated finite element model. The validation uses strains measured at the John F. Kennedy International Airport. To calculate critical curling stresses and deflections, the pavement was subjected to 5263 h of temperature variation determined by utilising the enhanced integrated climate model and thermocouple readings. The profiles include a wide range of average temperatures, temperature gradients, and temperature nonlinearity. Three conditions were included: (1) joints free to displace and rotate; (2) joints free to rotate, but partially restrained to vertical displacement; and (3) joints partially restrained to vertical displacement and rotation. Differences in critical stresses between the second and third conditions were greater than 5% for 70% of the time. When considering rotational restriction, critical deflections are reduced. Eighty percent of the difference, with respect to the free case, was caused by rotational restriction. It was evident that joint rotation intensifies the influence of curling stresses and deflections on long-term performance of airfield rigid pavement.

摘要

本文在使用经过验证的有限元模型计算临界卷曲应力和挠度时，量化了限制与机场混凝土路面接头旋转的相关性。验证使用在约翰肯尼迪国际机场测量的菌株。为了计算临界卷曲应力和挠度，路面经受了 5263 小时的温度变化，该温度变化是利用增强的综合气候模型和热电偶读数确定的。这些曲线包括广泛的平均温度、温度梯度和温度非线性。包括三个条件：（1）关节自由移位和旋转；(2) 关节可自由转动，但部分受限于垂直位移；(3) 关节部分受限于垂直位移和旋转。在 70% 的时间内，第二和第三个条件之间的临界应力差异大于 5%。在考虑旋转限制时，会减少临界偏转。在自由情​​况下，百分之八十的差异是由旋转限制引起的。很明显，联合旋转加剧了卷曲应力和挠度对机场刚性路面长期性能的影响。