【作者】 闫翔宇；

【导师】 陈志华；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 斜拉桥是由塔、梁和索三种基本构件组成的缆索承重体系,具有受力性能好、跨越能力大、结构新颖、形式多样等优点,在桥梁工程中得到了飞速的发展和广泛的应用。摩天轮是一种游乐设施,自从世界上第一个现代大型摩天轮在芝加哥出现以后,在世界范围内得到了迅速的发展。本文研究对象利用斜拉桥的桥塔把二者首次结合起来,形成了新型斜拉桥和摩天轮组合结构这一独创性结构体系,本文围绕这一新型组合结构体系完成了以下几方面的工作。 总结了斜拉桥和摩天轮的发展历史和趋势,分析了斜拉桥在静力、抗震、施工过程分析等方面的研究现状,提出了本文的选题背景和主要工作。在分析斜拉桥几何非线性的来源的基础上,总结了在进行斜拉桥分析时各种几何非线性因素的处理办法和非线性方程组的求解方法。 研究了几何非线性因素对新型斜拉桥和摩天轮组合结构静力行为的影响。建立了考虑拉索垂度效应、大位移效应、梁柱效应等因素影响的新型斜拉桥和摩天轮组合结构的三维有限元模型,并在此基础上研究了两种不同的支承方式对结构性能的影响,提出了一种合理的支承方式;在选定支承方式的基础上,在指定工况下进行了结构的几何非线性分析,讨论了各非线性因素对结构性能的影响。 对新型斜拉桥和摩天轮组合结构的动力特性进行了分析研究。推导了有限元法求解结构动力特性的步骤,提出了在ANSYS中的实现方法,建立了新型斜拉桥和摩天轮组合结构的动力分析模型,并对结构中的新型斜拉桥和摩天轮各自的动力特性以及整体组合结构的动力性能特点进行了分析总结。 对新型斜拉桥和摩天轮组合结构的进行了地震反应时程分析的研究。综述了地震反应分析的三种方法,重点对时程分析法的实现过程包括地震动的输入、振动方程的建立、动力方程的求解以及时程分析在ANSYS中的实现进行了研究;然后选用天津地震波对新型斜拉桥和摩天轮组合结构在单向一致激励下的地震反应进行了分析,得到了结构地震作用下的响应。 对新型斜拉桥和摩天轮组合结构的设定的施工过程进行了分析。概述了目前斜拉桥施工过程分析常采用的方法前进分析法和倒退分析法;然后根据倒退分析法的基木原理对一设定的施工方案中的一个施工过程进行了分析,指出了其存在的问题,并提出了改进的措施;最后对摩天轮的施工方法进行了探讨。更多还原

【Abstract】 Cable-stayed bridge is a cable-supported structural system consisted of pylon, girder and cable. Because of the advantage of perfect load-carrying performance, large-spanning ability, structural novelty and diversity pattern, it has been developed quickly and applied widely. Giant wheel as a pleasure facility has been rapidly expanded in the world since the first giant wheel comes into the world in Chicago in 1893. The bridge and the wheel have been united into one structure in the subject investigated of this paper. And a creative structural system has come into being—the composite structure of new cable-stayed bridge with giant wheel. Around the new structural system, the following work has been done.The history and the trend of development of the cable-stayed and giant wheel have been presented. And present state of the study on the static, dynamic and aseismatic behavior of cable-stayed is analyzed. Then the background and the main work of this paper are put forward. Base on the analysis of the source of geometric nonlinear factors of cable-stayed, the method coped with each geometric nonlinear factor is presented. Also the method of solving the nonlinear equations is discussed.The influence of geometric non-linearity on the static characteristic of the composite structure of new cable-stayed bridge with giant wheel has been studied. A three-dimension model incorporating the sag of cable, large displacement of structure and the effects of beam-column has been developed. The comparison of two supporting systems is done and a rational one is confirmed. Base on the confirmed supporting system, the effect of each nonlinear factor on the behavior of the whole structure is discussed under the action of a certain load case.Analysis on dynamic characteristic of the composite structure of new cable-stayed bridge with giant wheel has been performed. The process of achieving the dynamic characteristic of the structure by finite element method is deduced. And the implementation way in ANSYS is advanced. A model for dynamic analysis is established and then the natural frequency and vibration mode of the new cable-stayed bridge, the giant wheel and thewhole structure is obtained. Also the trait of the dynamical performance of the structure is discussed.Seismic response analysis on the composite structure of the new bridge with giant wheel incorporating the geometric non-linearity has been done. Three methods for analyzing the structural response under the action of earthquake are summarized. And the emphasis is put on the procedure of the time-history method, which includes the input of seismic wave, the establishing and solving of vibration equations. Also the method of realizing method in ANSYS is brought forward. Then the seismic response of the composite structure is analyzed by inputting Tianjin wave in the longitudinal direction and the displacement and force response of the structure is achieved.Analysis of the new cable-stayed bridge with giant wheel during construction is made. The general analytical method of cable-stayed during construction is overviewed—forward process analysis and backward process analysis. Then based upon the principle of the backward process analysis, analysis of the structure in a certain state during one construction procedure is done and the existed problem is indicated. Also an improved measure is put forward. At last the construction method of the giant wheel is discussed.更多还原