【作者】 曾晓茜；

【导师】 钱永久；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2013， 硕士

【摘要】 我国幅员辽阔,水道纵横,桥梁建设成为交通线路上的重要组成部分。预应力混凝土连续刚构桥以其众多优点而备受青睐,但苦于病害的困扰,其发展受到了阻碍。为了避免病害的出现或针对己出现的病害采取有效的加固措施,分析病害影响因素及其发生原因就显得尤为重要。本文主要进行了以下研究工作：首先阐述了PC连续刚构桥的发展背景、历程、特点及展望,详细介绍了影响此类桥梁使用性能的几个重要因素(结构构造、混凝土收缩徐变、预应力损失、温度)的机理、计算方法和适用条件等。然后,探讨了裂缝、跨中下挠等病害,并将裂缝按照不同的方法进行归类。随后,又对北排涌主桥进行了专项检测,详细分析了实测资料,得出病害检测结果。采用MIDAS/CIVIL软件建立原始的全桥梁单元模型,建立多种工况进行计算,分别研究了结构在收缩徐变、预应力损失、温度、超载等因素影响下的响应。在病害检测结果的基础上,考虑各因素的综合影响,最终获得了较为符合实际损伤状态的梁单元损伤模型。出于对38#墩上0#块构造和受力上复杂性的考虑,本文还运用MIDAS/FEA对此区域长约26m的梁段,单独建立局部实体模型来进一步分析,然后对比梁单元模型和实体模型的计算结果并得出相应结论。更多还原

【Abstract】 China has a vast territory with a large amount of watercourse. Bridge construction has become an important part of the road lines. Prestressed concrete (PC) continuous rigid frame bridge is always favored rely on its advantages, but its development has been hampered because of various diseases. So analyzing the causes and influence factors of diseases is particularly important to avoid appearing of the similar diseases or to take effective reinforcement measures. Researches that have done in this paper are as follows:Firstly, development background, history, characteristics and prospects of PC continuous rigid frame bridge are briefly introduced. The mechanism, calculation methods and application conditions of several important performance affecting factors (structure, shrinkage and creep, loss of prestress, temperature) are described in detail afterwards. Then, cracking, mid-span down-warping and other diseases are mentioned, in addition, cracks are classified by different principles. After that, a special inspection on Bei Pai Yong main bridge is commenced, and based on which, detailed inspection results are gained.Secondly, the original beam element model is built with MIDAS/CIVIL software. By calculating a variety of conditions, some researches on structural response with influence of shrinkage and creep, prestress loss, temperature and overload have done. And then, based on detect results and influence factors, a damaged state beam element model is built, which is most in line with the actual damage state.Considering the complexity of structure and force of0#block on38#pier, MIDAS/FEA software is used to build a partial solid element model, which is about26meters long. Latterly, calculated results of damaged state beam element model and partial solid element model are compared, and some conclusions are obtained.更多还原