自锚式悬索桥合理成桥状态及受力特性研究

Research of Reasonable Completion State and Stress Characteristics of Self-Anchored Suspension Bridge

结合自锚式悬索桥受力和施工特点,以鄂尔多斯市某双塔三跨自锚式悬索桥为工程背景,对自锚式悬索桥合理成桥状态的计算方法、吊索张拉顺序和动力特性展开研究,实践表明,采用基于影响矩阵的零位移法确定自锚式悬索桥合理成桥状态的方法,简单实用,计算精度高,具有较高的工程应用价值,经验算成桥运营状态结构强度和刚度均满足设计要求。采用无应力状态法进行正装分析,通过对比分析施工阶段桥梁结构的响应,优化吊索张拉顺序,明确了合理施工状态,包括缆形、吊索力、索鞍预偏量等。通过对桥梁结构进行动力分析得到一些结论可为同类桥梁提供参考。

Combining the stress and construction characteristics of self-anchored suspension bridge, taking the three span self-anchored suspension bridge of a twin towers in Ordos City as the engineering background, the calculation method of reasonable completion state, the tension sequence of the hanger and dynamic characteristics of self-anchored suspension bridge are studied. The method based on the zero displacement method on the influence matrix is adopted to determine the reasonable completion state of the self-anchored suspension bridge was proved which is simple and practical,with high calculation precision,high engineering application value. Both the strength and stiffness of the bridge meet the design requirements. Normal state analysis is carried out by using the stress free state method. the tension sequence of the hanger is optimized according to the response of the bridge structure in the construction stage. The reasonable construction state is determined, including the cable shape, hanger force, the pre deflection of the saddle and so on. Through the dynamic analysis of bridge structure, some conclusions can be reference for similar bridges.