【摘要】 为了研究我国东北地区机场水泥混凝土道面板板角温度分布规律及温度-应力/应变关系,依托新建松原查干湖机场道面工程开展道面温度翘曲试验,应用智能温度、应变传感器监测板角不同深度处的温度与应变、应力日间变化和季节性变化差异。研究结果表明:板内温度-应变增量日间变化规律具有明显的滞回特性,且板顶同一点横向温度-应变增量滞回圈面积比纵向的大;板内应力的日间变化具有近似周期性波动特征,波动峰值滞后温度波动峰值约1h,且任一时间板内同一点纵、横向应力相差不大。板内温度及应变、应力受季节性环境温度影响显著,随环境温度的降低,板内正、负温度梯度的日间交替持续时间有明显变化;板内温度-应变增量滞回圈面积逐渐减小;板顶最大压应力逐渐减小,最大拉应力几乎不受影响。更多还原

【Abstract】 In order to study the temperature distribution and temperature-stress/strain relationship of concrete slab corner of airport pavement in northeast China, a pavement temperature warping experiment was carried out based on the Chagan Lake Airport Pavement Project under construction. Daily and seasonal variations of temperature, strain and stress at different depths of concrete slab corner were constantly monitored by intelligent temperature-strain sensors. The results show that the daily variations of the temperature-strain increment in the lab have obvious hysteretic-like characteristics, and the transverse temperature-strain increment hysteresis loops are larger than those in the longitudinal direction in the same position on the top of the slab. Daily variations of the stress in the slab are characterized by approximate periodic fluctuation; However, the wave peaks of the stress lag behind the temperature about an hour. Meanwhile, there is little difference between the longitudinal and transverse stresses in the slab at the same time and in the same position. The temperature, strain and stress in the slab are significantly influenced by the seasonal environment temperature. With the decrease of the environment temperature, the daily alternating durations of the positive and negative temperature gradients in the slab vary accordingly, and the temperature-strain increment hysteresis loops shrink gradually. Simultaneously, the maximum compressive stress on the top of the slab decreases, but the maximum tension stress are hardly affected.更多还原