某斜拉桥索力分析及施工监控

发布时间：2019-01-06 06:12

【摘要】：斜拉桥是桥梁结构中不可或缺的桥型,与其它桥梁结构相比,斜拉桥不仅具有跨度大、梁体尺寸小、造型美观等优势,而且经济效益显著。斜拉桥主梁内力的影响因素较多,其中拉索索力大小及索力分布的影响尤为明显。斜拉索具有可调节性,斜拉桥结构的内力状态可通过调整拉索索力来改善,因此,对斜拉桥的索力研究具有重要意义。斜拉桥拉索索力分为成桥索力和施工索力。成桥索力是斜拉桥成桥后的拉索索力,而施工索力是施工过程中为了达到成桥索力并保证每个施工阶段的安全所确定的索力。目前研究成桥索力与施工索力的方法较多,本文详细阐述了相关方法的基本理论,研究了基于影响矩阵法确定斜拉桥成桥索力与施工索力的原理和方法,并应用优化后的影响矩阵法对某实际工程案例中的拉索索力进行计算分析。本文主要研究了影响矩阵法在确定斜拉桥的成桥索力和施工索力中的应用。斜拉桥模型是通过大型有限元软件MIDAS建立的,在斜拉桥模型基础上应用影响矩阵法,分析出斜拉桥的成桥索力和施工索力,并与施工图纸的成桥索力和施工索力进行对比分析,验证影响矩阵法的准确性。另外,本文以某实际工程为依托,对施工过程中的线形、应力、索力和温度进行监测,据此实现了对下一施工阶段的线形和内力的预测,进而给出相对合理的反馈措施以确保施工过程的安全及稳定。监控结果也进一步验证了利用影响矩阵法求出施工索力的准确性。在文章的最后对斜拉桥索力进行探讨,提出本文未考虑到的因素及对影响矩阵法运用的展望。
[Abstract]:Cable-stayed bridge is an indispensable bridge type in bridge structure. Compared with other bridge structures, cable-stayed bridge not only has the advantages of large span, small beam size and beautiful shape, but also has remarkable economic benefits. There are many factors affecting the internal force of the main girder of cable-stayed bridge, especially the magnitude of cable force and the distribution of cable force. The internal force of the cable-stayed bridge can be improved by adjusting the cable force, so it is of great significance to study the cable force of the cable-stayed bridge. Cable force of cable-stayed bridge is divided into bridge cable force and construction cable force. The bridge cable force is the cable force after the cable-stayed bridge is completed, and the construction cable force is determined in order to achieve the bridge cable force and ensure the safety of each construction stage. At present, there are many methods to study the cable force and the construction cable force of the cable-stayed bridge. In this paper, the basic theory of the relevant methods is expounded in detail, and the principle and method of determining the cable force and the construction cable force of the cable-stayed bridge based on the influence matrix method are studied. The influence matrix method is used to calculate and analyze the cable force in a practical engineering case. This paper mainly studies the application of influence matrix method in determining cable force and construction cable force of cable-stayed bridge. The cable-stayed bridge model is established by the large-scale finite element software MIDAS. Based on the cable-stayed bridge model, the cable force and the construction cable force of the cable-stayed bridge are analyzed by using the influence matrix method, and compared with the cable force and the construction cable force of the construction drawing. Verify the accuracy of the influence matrix method. In addition, based on a practical project, this paper monitors the line shape, stress, cable force and temperature in the construction process, and realizes the prediction of the line shape and internal force in the next construction stage. Then reasonable feedback measures are given to ensure the safety and stability of the construction process. The monitoring results also further verify the accuracy of using the influence matrix method to calculate the construction cable force. At the end of the paper, the cable force of cable-stayed bridge is discussed, and the factors which are not considered in this paper and the prospect of the application of the influence matrix method are put forward.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27

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