【作者】 叶志龙；

【导师】 沈锐利；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 悬索桥本身固有的力学特性和专有的施工方法决定了主缆线形和结构参数取值精确程度的重要性。悬索桥结构线形不可能靠施工阶段的跟踪调整来逼近实现设计的理想线形,其结构线形必须依赖提供可靠的计算参数、采用精确的计算方法,再通过严格的制造和施工质量的控制,使结构实际成桥状态与设计理想状态最大限度的吻合。本论文围绕主缆线形计算方法和架设误差以及结构相关参数敏感性展开分析论述。首先,论文针对不同跨度的悬索桥主缆索股架设,分析温度测量元件和几何测量仪器等的精度对结构线形测量误差的影响,分析时考虑了实际测量中的一些相关连的因素。由此提出了各种跨度悬索桥在当前温度和线形测量精度范围内所能控制的误差范围。其次,论文以一座在建的特大跨度悬索桥为研究对象,分析主缆弹性模量、横截面积和加劲梁重量、刚度取值误差对结构线形内力的影响程度。该桥为主跨1650米两跨连续全漂浮体系钢箱梁悬索桥,通过对该桥主要影响参数的分析,对特大跨悬索桥的主要影响参数敏感性在量上有着较为准确的把握。最后,论文着重分析了主缆索股架设间距对成缆线形的影响。基于目前的成熟的悬索线形计算分析理论,建立了主缆索股架设紧缆的模拟算法,并利用VC⁺⁺计算机语言编制了相应的计算程序CSAA。利用CSAA计算分析了不同跨度悬索桥在不同索股架设间距下所具有的成缆线形,得出一些相关结论。本文研究分析了悬索桥主缆线形误差和结构主要影响参数的敏感性,得出了一些较有意义的结论,对悬索桥的施工及监控具有一定的参考价值。更多还原

【Abstract】 The inherent mechanics characteristic and the appropriation construction method of the suspension bridge decides the importance of the main cable shape and the precise degree of the structural parameters value. It is impossible to achieve the design ideal shape by track and adjustment in the construction stage. So its structure shape relies on providing reliable computation parameter and using precise computational method and then through strict manufacture and construction quality control, to make sure the real structure condition tallies with the ideal design condition in maximum limit. The paper launches the analysis and discussion regarding the main cable shape computational method and the surveying error as well as the related structure parameter sensitivity.Firstly, the thesis analyzed the influence of the precision error made by the temperature survey equipment and geometry surveying instrument to the structure shape in view of suspension bridges of different span in the erection of the wire strand of the main cable process. This analysis considered some related factors in the actual survey.As a result the thesis presented the error range in the current temperature and shape surveying precision of suspension bridge in each kind of span.Next, the thesis took one extra-long span suspension bridge which is being constructed as the object of study to analyze the influence degree of the elasticity coefficient of the main cable, the cross sectional area, the weight of the stiffening girder and the value error of the rigidity on the structure shape inner force. This main span of the bridge is 1650 meter and it has two spans with steel box girder and the entire floating system. Through the analysis of the major effect parameter to this bridge, the extra-long span suspension bridge’s major effect parameter sensitivity in the quantity have been grasped more accurately.Finally, the thesis emphatically analyzed the influence of the erection spacing of wire strands on the cable shape. On the basis of the mature suspension bridge computation analysis theory at present, the simulating algorithm of the erection of the wire strands of the main cable is established and VC++machine language is used to make the corresponding structure computation analysis program CSAA. Then, by using program CSAA, the main cable shape in various erection spacing of various suspension bridge span is calculated and some relative conclusion is made.The thesis researched and analyzed the sensitivity of the main cable shape error and the major effect parameter of the suspension bridge, and drew some meaningful conclusion which has certain reference value to the suspension bridge’s construction and monitoring.更多还原