斜向预应力混凝土路面数值模拟

发布时间：2018-11-03 20:59

【摘要】：为研究斜向施加预应力路面的受力特性,通过理论推导由斜向预应力产生的路面板内压应力计算公式,预应力筋的直径、布设角度和间距是影响板内应力的主要因素。建立力学模型,模拟分析预应力筋作用位置、布设间距和角度以及直径大小对路面板应力的影响,结果表明,斜向预应力混凝土路面的锚固区和板角部分区域出现拉应力,但混凝土不会出现开裂;预应力筋布置在1/2板厚偏下是合理的,此时板底压应力大于板顶部,路面板产生负弯矩;预应力布设角度建议范围为25°~45°;考虑到经济性和预应力筋张拉空间,建议预应力筋布设间距最小为0.5 m,预应力筋的布设间距也不能过大,过大易造成路面板应力分布不均匀;可通过调整预应力筋的直径,以得到合理的布设角度和间距。
[Abstract]:In order to study the stress characteristics of the road surface subjected to oblique prestress, the formula for calculating the internal compressive stress of the pavement slab produced by the oblique prestressing force is derived theoretically. The diameter, placement angle and spacing of the prestressed tendons are the main factors affecting the internal stress of the slab. A mechanical model was established to simulate and analyze the influence of the position of prestressed tendons, spacing and angle of arrangement and diameter on the stress of the pavement slab. The results showed that tensile stress appeared in the anchoring area and the part area of the slab angle of the oblique prestressed concrete pavement. But concrete will not crack; It is reasonable to arrange the prestressed tendons at 1 / 2 thickness of slab, where the compressive stress at the bottom of the slab is greater than that at the top of the slab, and the negative bending moment is produced in the pavement slab, and the recommended angle of prestress placement is 25 掳~ 45 掳. Considering the economy and the tensioning space of prestressed tendons, it is suggested that the minimum spacing of prestressed tendons should be 0.5 m, and the spacing of prestressed tendons should not be too large. By adjusting the diameter of the prestressed tendons, the reasonable angle and spacing can be obtained.
【作者单位】：西安公路研究院;陕西省交通建设集团公司;
【基金】：国家西部交通建设科技项目(2011318793650)
【分类号】：U416.216

【参考文献】