Those of multi - span , middle - length ( about 25 - 40 metres ) are of large percentage among advanced bridges . simply - supported girder bridges with continuous decks are inferior to those of continuous girders because their decks crack easily . owing to the complex construction of continuous girder bridges , which is laboursome and time - consuming , people have been thinking about an approach to combining the advantages of the two so as to speed up the building and reduce the work procedures 在高等级公路桥梁中,多孔中等跨径(跨径在25 40米左右)的桥梁占很大的比重,桥面连续的简支梁结构体系由于存在桥面容易开裂等缺点而在与连续梁结构体系的竞争中常常处于下风。
This paper presents the design method for a long span concrete continuous girder bridge with precast segments , mixed arrangement of internal and external tendons , and to be constructed with cantilever erection by overhead launching gantry , and also discusses several issues of the type of the bridge in need of special considerations in aspect of design calculations and constructional design 摘要介绍采用节段预制架桥机悬拼施工,采用体内、体外混合配束的大跨度混凝土连续梁侨的设计方法,对设计计算及在构造设计上需要特殊考虑的一些问题进行了探讨。
During the course of studying , the correlative effect of the components or son - systems of the continuous girder bridge system is considered , and the whole domino offect of the bridge is also taken into account . the reasonable computational method is put forward , so the characteristic of invalidity of the continuous girder bridge system can be grasped as a whole , and the more scientific method is provided for such system 在研究过程中,考虑了连续梁桥各构件或子体系的相关性作用和桥梁整体效应的影响,提出了较为合理的可靠度计算方法,因而可以总体上把握连续梁桥结构体系的失效特点,为该体系的可靠性分析提供了更科学的理论方法。