多塔悬索桥静动力特性及结构体系适宜性研究

发布时间：2018-01-09 13:11

本文关键词：多塔悬索桥静动力特性及结构体系适宜性研究　出处：《北京建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：多塔悬索桥这种新型结构形式,可以实现超长跨越,在同类桥型中优势非常明显,是目前跨海工程中首选桥型。但是目前国内外大跨度多塔悬索桥实例很少,只有中国已经建成的泰州长江大桥和正在建设的马鞍山长江大桥和武汉鹦鹉洲长江大桥,这说明多塔悬索桥的分析研究才刚刚起步,并且对这种结构体系受力性能还没有很好的把握,诸多技术难题有待解决,只有将存在的难题充分的解决,多塔悬索桥才能更好的应用于实践中。因此,本文首先对两塔及多塔悬索桥成桥状态的力学性能进分析,然后对比了分析了两塔及多塔悬索桥的静动力性能,并对三塔悬索桥结构体系进行了适当的研究。本文主要工作内容如下： 1、首先介绍了大跨度多塔悬索桥发展的历史背景及研究的现实意义,对世界悬索桥的发展历程进行阐述,列举了国内外目前已经建成的多塔悬索桥实例以及曾经在设计过程中提出过的方案,并着重分析了国内外学者对大跨度多塔悬索桥问题的研究。 2、其次对悬索桥发展的理论进行介绍,即弹性理论、挠度理论和有限位移理论,并主要对有限位移理论进行了相关阐述,列举了非线性有限元问题的影响因素和相关解法以及在计算过程中的收敛准则；并对悬索桥结构动力分析理论中的研究方法、自振特性理论以及相关振动方程进行了相关阐述。 3、对悬索桥初始平衡状态理论进行了介绍,对比分析了两塔悬索桥和多塔悬索桥之间成桥状态主缆位移以及主缆和吊索内力的差异,并分别在汽车活载和风荷载作用下对比分析了两塔悬索桥和多塔悬索桥之间的力学特性的差异,并对悬索桥自振频率特性进行了对比,从而得出两塔悬索桥与多塔悬索桥体系之间不同的静动力性能,分析了多塔效应对悬索桥力学性能的影响。 4、以三塔悬索桥为例,对三塔悬索桥这种创新型结构体系进行了适当的分析研究,主要分析了关键设计参数中塔处塔梁约束形式、中塔刚度和主缆矢跨比对三塔悬索桥结构静动力性能的影响,接着采用Abaqus建模来与Midas civil进行力学性能对比,从而验证Midas civil结果的可靠性；并通过前文不同参数计算分析所产生的效应来提出各参数所控制的关键指标,分析关键指标来得出三塔悬索桥在不同设计参数下适宜的结构体系。
[Abstract]:This paper firstly analyzes the mechanical properties of the two towers and the multi - tower suspension bridge , and then compares the static and dynamic performance of the two towers and the multi - tower suspension bridge , and then compares the static and dynamic performance of the two towers and the multi - tower suspension bridge . The main work of this paper is as follows : 1 . Firstly , the historical background of the development of the long - span multi - tower suspension bridge and the practical significance of the research are introduced . The development course of the world suspension bridge is described . The example of the multi - tower suspension bridge which has been completed at home and abroad and the scheme that have been proposed in the design process are listed , and the research on the problems of large - span multi - tower suspension bridge is emphatically analyzed . 2 . Secondly , the theory of suspension bridge development is introduced , that is , elastic theory , deflection theory and finite displacement theory , and the theory of finite displacement is described . The influencing factors and related solutions of nonlinear finite element problem and the convergence criterion in the calculation process are enumerated . The research methods , the self - vibration characteristic theory and the related vibration equation in the theory of dynamic analysis of suspension bridge are expounded . 3 . The initial equilibrium state theory of the suspension bridge is introduced , and the difference between the main cable displacement and the inner force of the main cable and the suspension cable is analyzed . The difference of the mechanical properties between the two tower suspension bridges and the multi - tower suspension bridge is compared and analyzed under the action of live load and wind load of the vehicle , and the self - vibration frequency characteristics of the suspension bridge are compared , so that the influence of the multi - tower effect on the mechanical properties of the suspension bridge is analyzed . 4 . Taking the three - tower suspension bridge as an example , the new structure system of the three - tower suspension bridge is analyzed and studied . The influence of the constraint form , the rigidity of the middle tower and the span ratio of the main cable on the static and dynamic performance of the three - tower suspension bridge structure is analyzed . Then , the reliability of the result of Midas civil is verified by using Abaqus modeling .

【学位授予单位】：北京建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25

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