梁拱组合结构吊杆索力研究及抗震分析

发布时间：2018-02-23 03:16

本文关键词： 梁拱组合结构索力优化最小弯曲能量法抗震分析　出处：《兰州交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着社会的发展和进步，特别是近些年来一些新技术的应用，，钢管混凝土拱桥在我国桥梁建设中占据越来越重要的作用。其中的梁拱组合结构，以其优异的跨越能力、良好的受力、及对地基的广泛适用性成为最具竞争力的桥型之一。这种桥型虽然结合了梁桥和拱桥的优点，但也出现了一些新的课题，比如梁拱组合结构吊杆索力及抗震，需要广大的科学工作者进行研究。本文以年楚河特大桥为工程背景，对梁拱组合结构成桥阶段、施工阶段的吊杆索力及整个桥梁结构抗震进行分析研究，主要做以下几方面的工作：一、回顾从早期的石拱桥到钢桁拱桥、从混凝土拱桥到钢管混凝土拱桥的发展，简单介绍梁拱组合结构，回顾钢管拱桥的研究现状，尤其吊杆索力的研究和拱桥的抗震研究方面。二、梁拱组合结构合理成桥吊杆索力的确定。首先，介绍了三种常用的确定合理成桥索力的方法——刚性支承连续梁法、最小弯曲能量法、刚性吊杆法，然后，使用这三种方法计算确定年楚河特大桥合理成桥状态的索力。在分析每种方法优劣的基础上，最终选择的成桥索力为最小弯曲能量法所计算确定的。三、施工阶段吊杆张拉索力的确定。在确定成桥索力的基础上，本文对一轮张拉和两轮张拉分别进行分析，确定施工阶段吊杆张拉力。一轮张拉分析，使用考虑施工阶段的未知荷载系数功能，将施工阶段索力设为单位拉力，进行施工阶段分析，然后设置约束条件，得到相应未知荷载系数，进而得到各施工阶段的吊杆张拉索力。二轮张拉分析，先用试算法确定第一次张拉的吊杆张拉力，然后使用影响矩阵法确定第二次张拉的吊杆张拉力。四、进行抗震分析。在确定该梁拱组合结构桥成桥索力的基础上，对该桥进行抗震分析。首先，进行动力特性分析，进而得到该结构的动力特性，比如振型形状、固有周期和频率、振型参与系数等，然后在此基础上进行反应谱分析和动力时程分析。
[Abstract]:With the development and progress of society, especially the application of some new technologies in recent years, CFST arch bridge occupies more and more important role in the bridge construction in our country. The girder and arch structure, with its excellent ability to leap, good stress, and wide applicability to the foundation of the bridge has become one of the most competitive. Although this bridge combines the advantages of beam bridge and arch bridge, but there are also some new issues, such as the beam arch combination structure of Suspender Force and seismic, the need of scientific research workers.
In this paper, Nianchu River Bridge, girder and arch combination bridge structure, analysis of cable force and the whole bridge structure seismic construction boom, mainly do the following aspects of the work:
First, from the early stone arch bridge to the steel truss arch bridge, from the concrete arch bridge to the concrete filled steel tube arch bridge, the paper briefly introduces the beam arch composite structure, reviews the research status of the steel tube arch bridge, especially the study of the suspender cable force and the aseismatic research of the arch bridge.
Two, to determine the reasonable structure combined beam arch bridge suspender force. Firstly, this paper introduces three common set of rigid support continuous beam method of bridge cable force is reasonable, the minimum bending energy method, rigid hanger method, and then use these three methods to calculate and determine the reasonable cable force of Nianchu River Bridge Bridge state. Based on analyzing the merits of each method, the final selection of the cable force calculation to determine the minimum bending energy method.
Three, determine the construction stage cable force. Based on determining the cable force on the wheel tension and two tension were analyzed, determine the construction stage suspender tension. Round tension analysis, with unknown coefficient of load in construction stage, the construction stage cable force a unit of force, the construction stage analysis, and then set the constraint conditions, the corresponding unknown load coefficient, then get the cable force of each construction stage. The two round of tension analysis, first determine the first tension suspenders with trial method, then use influence matrix method to determine second tension the suspenders.
Four, seismic analysis. Based on determining the cable force of the girder and arch combination bridge structure, seismic analysis of the bridge. Firstly, the dynamic characteristic analysis, then get the dynamic properties of the structure, such as mode shape, natural period and frequency, vibration mode participation coefficient, and then on this basis the response spectrum analysis and dynamic time history analysis.

【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.22

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