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4.2 拱圈计算考虑大圆弧圈只承受主动土压力,由于拱墩仍有可能发生侧向位移,则钢筋混凝土拱圈宜做成三铰拱结构以适应拱墩变位。因此,大圆弧拱圈一般按三铰圆弧拱计算公式计算拱圈轴向压力,再根据拱圈材料的容许抗压强度计算拱圈厚度。由于小圆弧拱圈的部分拱段进入被动土压力区域,作用于拱圈上的土压力强度 P一般介于主动土压力 Pa 和被动土压力 Pp 之间。但是,小圆弧拱圈轴力肯定要比大圆弧
Arch arch calculation Consider the large circular arc only take the initiative to earth pressure, due to the arch pier may still occur lateral displacement, the reinforced concrete arch ring should be made of three hinge arch structure to accommodate the displacement of the arch. Therefore, the large arch arc generally calculated according to three-arch arc arch arch axial pressure, arch arch ring according to the allowable compressive strength of the arch thickness calculation. As part of the arc arch of the arch into the passive earth pressure area, the role of the arch on the earth pressure intensity P is generally between active earth pressure Pa and passive earth pressure Pp. However, the small arc arch ring axial force must be larger than the arc