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文章探讨了板底脱空的形成机理,应用有限元方法,分析了在不同车辆荷载(单轴和双轴)作用下有限尺寸板在脱空状态下的荷载应力,研究发现水泥混凝土面层板板底脱空区沿板横缝近似对称分布,且为近似的三角形楔形体,距板角愈近脱空高度愈大。当板角脱空面积达到1/2×1.0×1.0m2左右,面板最大拉应力的作用位置由板底转到板顶,可以认为,1/2×1.0×1.0m2的脱空面积是给面板带来不利影响的临界值。
In this paper, the forming mechanism of the void of the bottom of the slab is discussed. The finite element method is used to analyze the load stress of the slab under the condition of different sizes of vehicle (uniaxial and biaxial). The results show that the cement concrete slab The void area of the bottom plate is approximately symmetrical along the transverse seam of the plate, and is an approximate triangular wedge. The greater the height of the void from the plate angle, the more it is. When the angle of void area reaches about 1/2 × 1.0 × 1.0m2, the maximum tensile stress of the panel is transferred from the bottom of the plate to the top of the plate. It can be considered that the void area of 1/2 × 1.0 × 1.0m2 is given to the panel The detrimental impact of the critical value.