石拱桥极限承载能力分析与影响因素

发布时间：2018-01-19 03:25

本文关键词： 极限承载力线弹性稳定非线性稳定拱上联合　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：对圬工拱桥的受力特点是比较复杂,由此成为了过国内外诸多学者以既定的拱桥为研究对象,从而分析其受力行为,对计算极限承载力也是逐渐趋向成熟,避免过高或过低的评价桥梁承载力,更能准确的确定其承载力。本文基于荷载试验实际测算的数据基础上,对石拱桥做了细致的分析。分析拱上联合是如何影响结构受力以及对承载能力的影响,对承载能力的影响影响程度是多少,应用midas有限元软件对裸拱和拱上联合做了分析。分析拱桥在不同病害的影响因素,不同的影响因素对拱桥承载力的影响,此外,基于一座实测石拱桥的拱轴线,在设计与实际拱轴线之间的差异对石拱桥承载力的影响,以及按这一病害逐步加深的趋势,预测拱轴线的偏离对承载力的影响。对结构的承载力分析采用有限元方法,对石拱桥进入极限承载力状态的判定也做了全新的定义,更准确的分析极限承载力。从力学角度看,分析结构极限承载力的实质就是通过不断求解几何非线性和材料非线性的刚度方程,寻找其极限荷载的过程,从实质指出桥梁的承载力研究方法,分析与比较线弹性稳定的活载系数和非线性稳定的活载系数之间的差异,更精确研究了石拱桥承载力的作用,同时也分析不同荷载类型作用在石拱桥上对承载力的影响,同时也考虑石拱桥在偏载和中载作用的情况下对石拱桥承载力的影响,更加细微的考虑了荷载作用位置对承载力的影响,但两者之间的影响程度非常有限,材料非线性与几何非线性和线弹性分析有很大的差别,也就说明材料非线性分析极限承载力是非常有意义。
[Abstract]:The mechanical characteristics of masonry arch bridge is more complex, so many scholars at home and abroad have taken the established arch bridge as the research object, so the behavior of the arch bridge is analyzed, and the ultimate bearing capacity of masonry arch bridge is gradually becoming mature. Avoid too high or too low to evaluate the bearing capacity of the bridge, more accurate determination of its bearing capacity. This paper makes a detailed analysis on the stone arch bridge. It analyzes how the combination of arch and arch affects the bearing capacity of the structure and how much the influence degree of the influence on the bearing capacity is. The midas finite element software is used to analyze the joint of bare arch and arch. The influence factors of arch bridge in different diseases and the influence of different factors on the bearing capacity of arch bridge are analyzed. Based on the actual arch axis of a stone arch bridge, the difference between the design and the actual arch axis affects the bearing capacity of the stone arch bridge, and according to the trend of this disease gradually deepening. The finite element method is used to analyze the bearing capacity of the structure, and a new definition is made for the determination of the ultimate bearing capacity of the stone arch bridge. From the point of view of mechanics, the essence of analyzing the ultimate bearing capacity of structures is to find the process of ultimate load by solving the stiffness equations of geometric nonlinearity and material nonlinearity. The paper points out the research method of the bearing capacity of the bridge, analyzes and compares the difference between the live load coefficient of the linear elastic stability and the live load coefficient of the nonlinear stability, and studies the bearing capacity function of the stone arch bridge more accurately. At the same time, the influence of different load types on the bearing capacity of stone arch bridge is analyzed, and the influence of stone arch bridge on the bearing capacity of stone arch bridge is also considered. The influence of load position on the bearing capacity is considered more carefully, but the influence between them is very limited, and the material nonlinearity is different from geometric nonlinearity and linear elastic analysis. It also shows that nonlinear analysis of material ultimate bearing capacity is of great significance.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22

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