单拱面预应力混凝土系杆拱桥空间稳定试验研究

通过两个大比例模型试验,研究了单拱面预应力混凝土系杆拱桥面内、面外稳定极限承载力及其影响因素。试验结果表明,结构破坏表现为拱肋结构弹塑性失稳。模型1拱肋宽跨比为1/30,高跨比为1/80,结构失效表现为面内失稳,模型2拱肋宽跨比为1/60,高跨比为1/40,结构表现为侧倾失稳。本文初步探讨了单拱面预应力混凝土系杆拱桥空间稳定安全系数的取值。

Through two great model tests, this paper investigates the ultimate bearing capacity and its influence factor of the inside and outside face of prestressed concrete tied arch bridge with single arch. The experimental results shows that the destroy of the structure is resulted from the elasto-plastic failure of the arch rib. The width-span ratio is 1/30, depth-span ratio is 1/80 in the arch rib of model 1 and its failure is destabilization inside the face, while in the arch rib of model 2, the width-span ratio is 1/60, depth-span ratio is 1/40 and it shows the side-tipping failure. This paper also studies the determination of safety coefficient of the spatial stability in prestressed concrete tied arch bridge with single arch.