自锚式悬索桥合理成桥状态静力特性试验研究

摘要

Relying on a self-anchored suspension bridge supported by symmetric twin towers,we made an experimental study on the whole bridge scale model by the proportion of 1 ∶50.An equation a-nalysis method was carried out through the model design based on Stiffness Similarity Theory.We got stat-ic criterion of similarity on the multiphase medium scale model and the prototype structure.With the mu-tually confirmed method by the model test and finite displacement theory,studied the static characteristics of structural system in reasonable finished state of a self-anchored suspension bridg.Results show that:Except the strengthen suspenders beside the tower,the stress distribution on the slings of the whole bridge was more uniform;There was a high correlation between the characteristics of main cable stress distribu-tion and the line type of main cable;Under the combined action of bending moment and axial force,the stress distribution of upper and lower edge on the Stiffening girder was relatively uniform,line type met the requirements of design;The elements of bridge completion state had large safety reserve.Model test value coincided well with theoretical calculating value,meanwhile confirmed the rationality of the design about the scale model.%依托某双塔对称体系自锚式悬索桥，按几何缩尺比1∶50进行模型静力性能试验研究。模型设计上运用基于刚度相似原理的方程式分析法，获得了多相介质缩尺模型与结构原型的静力相似判据。采用模型试验与有限位移理论相互印证的手段，研究了自锚式悬索桥结构体系在合理成桥状态下的静力学特性。结果表明：除塔附近加强吊杆外，全桥吊索应力分布较为均匀；主缆应力分布特征与主缆线形具有较强相关性；加劲梁在弯矩与轴力组合作用下，上下缘应力分布较为均匀，线形符合设计要求；成桥状态各构件安全储备较大；模型验测试值与理论计算值吻合较好，同时印证了缩尺模型设计的合理性。