改梁拱式拱上建筑拱桥加固法分析研究-桥梁与隧道工程专业论文.docxVIP

华 华 中 科 技 大 学 硕 士 学 位 论 文 I I 摘 要 目前，越来越多的新材料、新技术不断涌现并被应用到拱桥加固设计研究之中， 课题组在这一背景下提出了改梁拱式拱上建筑加固空腹式拱桥的新方法。该方法是 一种通过改变结构受力体系、内力调整来提高拱桥承载力的全新的加固技术，并在 多项实际工程中取得了良好的效果。然而目前对该方法的研究主要是针对特定实例， 且多是关于施工层面的，尚未对其加固效果进行比较深入和系统的研究。因此，为 了更好地推广这项加固技术，本文对其加固后效果从有限元模拟、荷载试验及可靠 性评估多个方面进行了综合评价，证明了该加固方法加固在役拱桥是可靠、有效的。 本文所做的主要工作如下： 1、阐述了空腹式拱桥病害特征，并全面分析了其承载潜力。系统介绍了改梁拱 式拱上建筑加固空腹式拱桥的加固方法，阐述了其加固原理、措施及技术要点。创 新地引入标准化的概念，总结了改梁拱式拱上建筑加固法的加固标准化流程。 2、建立改梁拱式拱上建筑加固法的评价标准，将可靠度理论与有限元理论、荷 载试验相结合进行综合评价，形成了一套该方法的评估基本流程。 3、采用理论分析与具体工程实践相结合的研究方法，以七道河中桥工程为依托， 运用上述评估流程对其加固效果进行评价。验证改梁拱式拱上建筑加固法提高拱桥 承载力的正确性和可行性。 关键词：在役拱桥，梁拱式拱上建筑，可靠度，荷载试验，加固方法 II II Abstract Nowadays, more and more new materials and technologies were constantly emerging, which had been applied to the research of the arch bridge reinforcement. Our research group proposed a new reinforcement method by the change girder-arch spandrel construction in this context. This method was through changing the structure force system and stress to improve the bearing capacity. Furthermore, it had achieved good effect in many practical engineering. However, these studies of the method were mainly directed against the specific examples, moreover, which were almost on construction level, and did not having a deep and systematic research on the reinforcement effect. Therefore, in order to promote the reinforcement technique better, this paper made a comprehensive evaluation the reinforcement effect, especial through these aspects, such as the finite element simulation, after loading test and reliability evaluation. Generally, the paper proved the new reinforcement method for arch bridge in-service was reliable and effective. The key works performed in this paper were as follows: 1、Expounded the open-spandrel arch bridges disease characteristics, and analyzed them bearing potential totally. Given a comprehensive introduction about the change girder-arch spandrel construction reinforcement, expounded its reinforcing principle, measures and reinforcement technique points.