混凝土自锚式吊拉组合索桥的静力性能研究

Study of Static Properties of a Self-Anchored Concrete Suspension and Cable-Stayed Bridge

通过对一座跨径133 m混凝土加劲梁自锚式吊拉组合索桥的静力分析,研究了非线性、索面形式、吊索形式、加劲梁拱度、初始内力、温度及混凝土收缩徐变等因素对自锚式吊拉组合索桥的受力影响。结果表明:该跨径的自锚式吊拉组合索桥基本满足弹性理论;吊索形式对结构受力影响较大;加劲梁拱度的增加可以提高结构刚度,减小活载挠度;混凝土收缩徐变对结构的受力影响较大。

On the basis of the static analysis of a self-anchored concrete stiffening girder suspension and cable-stayed bridge with span length 133 m, this paper makes a study of the influences of various factors, such as those of the non-linearity, types of the cable planes and suspenders, camber of the stiffening girder, initial internal force, temperatures, concrete shrinkage and creep, on the mechanical behavior of the bridge. The results of the study indicate that the bridge with the span length as mentioned above can meet the requirements of elastic theory on the whole, the types of suspenders have fairly significant influence on the mechanical behavior of the bridge structure, the increase of camber of the stiffening girder can increase the rigidity of the structure and reduce deflection due to live load and meanwhile, the concrete shrinkage and creep also have considerable influence on the mechanical behavior of the structure.