水泥道面传力杆裹附混凝土应力响应模拟分析

Simulation on the Stress Response of Concrete Around Dowels in Airport Rigid Pavement

通过数值模拟分析了温度和荷载单独和叠加作用条件下的机场道面传力杆裹附混凝土的应力响应.使用Westergaard的温度梯度理论公式对有限元模型进行了准确性验证.模拟计算结果表明:在温度单独作用下,传力杆对道面板的挠曲有约15%的约束作用;荷载单独作用在板角传力杆滑动端上方时,混凝土内产生的应力最大;荷载作用下的最大应力仅在传力杆滑动端裹附的混凝土中产生.负温度梯度不利于降低受荷板的传力杆裹覆混凝土的应力集中,正温度梯度对其有利.

The stress response of concrete around dowels in airport rigid pavement under the individual action and superposition of temperature gradient and aircraft load was studied with finite element method(FEM)simulation.The model was validated by analytical equations under temperature gradient proposed by Westergaard.The results show that the dowels have approximately 15%of restraint on the deflection of the joint under temperature gradient.When the sole aircraft load is applied on the corner of the slab and above the sliding end of the dowel,the stress in the concrete sees its maximum.The maximum stress under sole load is only produced in concrete around the sliding end of dowels.Negative gradient is disadvantageous as to the stress concentration of concrete produced by aircraft load,while the positive gradient is advantageous.