独塔无背索实训斜拉桥设计

On the Design of a Single-Pylon Cable-Stayed Bridge Without Back-Stays for Practical Training

无背索斜拉桥结构形式新颖,造型优美,近年来在国内外逐步兴起。以石家庄铁道大学铁道实训基地内独塔无背索实训斜拉桥建设为工程背景,重点研究1-32m独塔无背索实训斜拉桥的设计方法与设计过程。由于桥梁荷载特殊,设计时并无可直接依据的规范,只能参考现行相关铁路、公路桥梁设计规范进行设计研究。拟定了桥梁的结构形式与结构尺寸,借助midas Civil有限元分析软件,采用先建立成桥模型再确定施工阶段索力的方法,对无背索斜拉桥成桥状态及施工过程进行仿真模拟,对计算结果进行分析,桥梁满足参考规范要求,可以应用于教学与科研工作。

Being novel in structural style and beautiful in shape？there are more and more cable-stayed bridges without back-stays being built both at home and abroad in recent years. With the construction of the single-pylon cable-stayed bridge without backstays of the Practical Railway Training Base of the Shijiazhuang Tiedao University as the engineering background, great stress is placed on the study of the design methods for and the design process of 1-32 m single-pylon cable-stayed bridges without back-stays for practical training. Because of the special load on the bridge,there are no ready design specifications that may be directly based on when the design of the bridge is performed. In that case？only the railway and highway bridge design specifica-tions can be referred to when the design of the bridge is studied. The structural form and structural sizes of the bridge are first worked out ,then a model for the bridge is established,after which the methods for the tensile forces of the stays at the stages of construction are determined with the help of the finite element analysis software of midas CiviUupon the basis of which the completion state and the process of the construction for the cable-stayed bridge without backstays are simulated, with the calculated results analyzed. It is found that the bridge is up to the requirements of the technical specifications referred to and may be used for teaching work and scientific research.