斜拉—悬吊组合体系桥动力性能研究

发布时间：2018-03-20 01:32

本文选题：斜拉—悬吊组合体系桥　切入点：动力特性　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：斜拉—悬吊组合体系桥是一种具有较强跨越能力的新型桥梁结构形式,它结合了斜拉桥和悬索桥的优点并在一定程度上克服了两者的缺点,具有广泛的应用前景。目前,国内外对这种桥型的动力性能研究还比较少。本文针对1400米主跨斜拉—悬吊组合体系方案桥,在总结国内外文献的基础上,从设计参数的角度出发,对斜拉—悬吊组合体系桥的动力特性和抗震性能进行了分析研究,同时与相同主跨的斜拉桥和悬索桥进行了分析和比较。研究成果对斜拉—悬吊组合体系桥抗震性设计具有较好的参考意义和应用价值。本文首先利用有限元分析软件MIDAS/Civil建立了1400米主跨斜拉—悬吊组合体系方案桥的三维有限元模型,并进行了结构动力特性分析,同时与相同主跨的斜拉桥和悬索桥结构体系的动力特性进行了对比分析。在此基础上,分析了不同结构参数诸如主缆矢跨比、吊跨比、边跨长度、辅助墩设置、主梁约束方式和主梁结构形式对斜拉—悬吊组合体系桥动力特性的影响。其次,分别采用反应谱法和时程分析法对斜拉—悬吊组合体系桥进行了抗震性能分析,讨论了两种分析方法下结构反应结果的差异,并与相同主跨的斜拉桥和悬索桥结构体系的抗震性能进行了对比分析。在此基础上,改变主缆矢跨比、吊跨比、边跨长度、辅助墩设置、主梁约束方式和主梁结构形式等结构主要设计参数,对其地震反应进行分析和比较,对设计参数的取值提出参考意见。通过分析和研究表明：(1)斜拉—悬吊组合体系桥振型频率较小,基本周期长,为柔性结构,振型分布密集,有振型耦合的情况;(2)组合体系桥动力特性介于斜拉桥和悬索之间,更为接近悬索桥,总体表现要优于同跨径斜拉桥与悬索桥；(3)与反应谱法相比,时程分析法可以考虑一些非线性因素的影响,能更准确地预测结构的抗震性能；(4)主缆矢跨比为1/10、吊跨比在0.4-0.5之间、采用短边跨并设置辅助墩、半漂浮体系、主梁采用混合梁形式的斜拉—悬吊组合体系桥具有较好的动力特性和抗震性能。
[Abstract]:The cable-stayed suspension composite system bridge is a new type of bridge structure with strong span ability. It combines the advantages of cable-stayed bridge and suspension bridge, and to some extent overcomes the shortcomings of both, and has a wide application prospect. There is little research on the dynamic performance of this type of bridge at home and abroad. In this paper, based on the summary of domestic and foreign literature, aiming at the 1400m main span cable-stayed suspension composite system bridge, from the point of view of design parameters, The dynamic characteristics and seismic behavior of cable-stayed suspension composite system bridge are analyzed and studied. At the same time, it is analyzed and compared with the cable-stayed bridge and suspension bridge with the same main span. The research results have good reference significance and application value for the seismic design of cable-stayed suspension composite system bridge. In this paper, the three-dimensional finite element model of 1400m main span cable-stayed suspension composite system bridge is established by using the finite element analysis software MIDAS/Civil, and the dynamic characteristics of the structure are analyzed. At the same time, the dynamic characteristics of cable-stayed bridge and suspension bridge with the same main span are compared and analyzed. On this basis, different structural parameters such as main cable rise-span ratio, hoisting span ratio, side span length, auxiliary pier setting are analyzed. The influence of the restraint mode and the structure form of the main beam on the dynamic characteristics of the cable-stayed suspension composite system bridge. Secondly, the seismic behavior of cable-stayed suspension composite system bridge is analyzed by using response spectrum method and time-history analysis method, and the difference of structural response results under the two analysis methods is discussed. The aseismic performance of cable-stayed bridge and suspension bridge with the same main span is compared and analyzed. On this basis, the main cable rise-span ratio, hoisting span ratio, side span length, auxiliary pier setting are changed. The main design parameters, such as the restraint mode of the main beam and the structural form of the main beam, are analyzed and compared, and the reference for the value of the design parameters is put forward. The analysis and research show that the vibration mode frequency of the cable-stayed suspension composite system bridge is small, the basic period is long, it is a flexible structure, the mode distribution is dense, and the dynamic characteristics of the composite system bridge are between the cable-stayed bridge and the suspension cable. Compared with the response spectrum method, the time history analysis method can take into account the influence of some nonlinear factors. The ratio of main cable to span is 1 / 10, the ratio of lifting to span is between 0.4-0.5, the short side span is adopted and auxiliary pier is set up, and the semi-floating system is used to predict the seismic performance of the structure more accurately. The cable-stayed suspension composite system bridge with hybrid beam has better dynamic and seismic performance.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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