钢管混凝土拱桥吊杆索力识别与优化分析

发布时间：2018-08-30 12:44

【摘要】：近几十年来，我国桥梁正随着经济的繁荣而迅猛的发展，尤其是对于大跨径桥梁来说，更是一个辉煌的时期。这其中，钢管混凝土拱桥就占有不小的比例，这类结构新颖、技术复杂、设计施工难度大、科技含量高。吊杆是钢管混凝土拱桥重要的受力构件，国内外一些中、下承式钢管混凝土拱桥的垮塌事故大多与吊杆的健康状态有关，定期了解吊杆的受力状况是判断钢管混凝土拱桥是否处于正常工作状态的重要依据。吊杆索力作为整座桥梁施工和后期桥梁养护管理与健康监测最重要的指标，长久以来得到了广大研究学者的广泛关注。所以如何识别吊杆的受力情况，特别是短吊杆的受力情况，，如何对多年使用吊杆健康状况进行评估，如何对桥梁结构即将出现的病变进行准确的预测等问题，是摆在吊杆索力识别领域的一个重要课题。只有高效准确的识别吊杆索力，尽早发现桥梁问题，才能避免对国家经济财产造成损失，才能避免对无辜群众造成伤害。本文研究内容主要分为五大部分：第一部分为吊杆索力识别的研究现状以及各种识别方法的优劣，并介绍了吊杆施工索力优化的常用方法；第二部分为频率法对吊杆索力识别的现状及其应用于吊杆的不足；第三部分基于APDL的ANSYS有限元优化技术，对吊杆进行参数化建模，研究了吊杆自身结构参数灵敏度的问题，并对吊杆索力进行优化分析，为后期索力识别软件的开发打下理论基础；第四部分结合沙河特大桥MIDAS有限元模型，对吊杆成桥索力及初始张拉力进行了优化分析，研究了该桥在施工及成桥状态结构应力及位移，分析了最优施工顺序；第五部分主要应用开发的索力识别软件对沙河特大桥吊杆索力进行实桥分析，表明该系统能够对沙河特大桥吊杆受力情况进行准确有效的识别，进一步提高了吊杆索力识别的精度。
[Abstract]:In recent decades, bridges in China are developing rapidly with the prosperity of economy, especially for long-span bridges, which is a glorious period. Among them, concrete filled steel tube arch bridge occupies a large proportion, this kind of structure is novel, the technology is complex, the design and construction is difficult, the science and technology content is high. Suspension rod is an important force member of CFST arch bridge. In some of the domestic and foreign, the through concrete filled steel tubular arch bridge collapse accident is mostly related to the health state of the suspender. It is an important basis to judge whether the CFST arch bridge is in normal working condition. As the most important index of the whole bridge construction and the maintenance management and health monitoring of the bridge, the cable force of the suspension rod has been widely concerned by many researchers for a long time. So how to identify the stress of the suspenders, especially the stress of the short suspenders, how to evaluate the health status of the suspenders used for many years, how to accurately predict the damage of the bridge structure, etc. It is an important subject in the field of cable force identification. Only by identifying the cable force of the suspenders efficiently and accurately and finding the bridge problem as soon as possible can we avoid the loss of the national economic property and the injury to the innocent people. The main contents of this paper are divided into five parts: the first part is the research status of cable force identification and the advantages and disadvantages of various identification methods, and introduces the common methods of cable force optimization in construction; The second part is the current situation of the frequency method for the cable force identification and the shortage of its application to the suspension rod. The third part is based on the ANSYS finite element optimization technology of APDL to model the suspension rod parameterized, and studies the sensitivity of the structure parameter of the suspender itself. The cable force of the suspension rod is optimized and analyzed, which lays a theoretical foundation for the development of the cable force identification software in the later stage. The fourth part combines with the MIDAS finite element model of Shahe Bridge to optimize the cable force and the initial tension force of the suspender bridge. The stress and displacement of the bridge in the construction and the state of the bridge are studied, and the optimal construction sequence is analyzed. In the fifth part, the cable force identification software is mainly used to analyze the cable force of the suspension rod of the Shahe super bridge. The results show that the system can recognize the force of suspension rod accurately and effectively, and improve the precision of cable force recognition.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.22

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