大跨度反吊桥结构性能与计算理论

本文以跨越黄河的刘家峡大桥为工程背景,研究大跨度反吊桥的结构性能与计算理论.模型试验结果表明:大跨度反吊桥具有结构性能好、施工中的事故风险小、能降低建造费用等优点.在一定地质、地形条件下,是一种可取的桥梁结构形式,特别适合于跨越深沟峡谷.文中还研究了地锚、梁端锚、斜腿顶锚同时并存的悬索混合锚固,桥的施工控制与抗震性能,给出了有意义的结果.

Structural Features and the Calculating Theory for an Upside Down Suspension Bridge with a Long Span

The Liujia Gorge Bridge over the Yellow River with a main span of 180m is taken as an engineering background for investigating the upside down suspension bridge with a long span. The structural parameters, construction practice and calculating theory for this type of bridge have been studied. A reinforced concrete model with a geometrical dimension of a-twentieth that of the bridge to be built has been used in the study. It has been found that the upside down suspension bridge has many advantages, such as better structural features, less accident risks during construction and lower cost. It is the author's view that it is advisable to have this kind of bridge built under certain topologicai and geological con ditions. Some useful results of the mixed anchor of the suspension cables, the adoption of tensile suspension cables anchored for adjusting the stress in the girder, the control of construction and the anti seismci behavior of the stiucture are described.