【作者】 陆燕青；

【导师】 谢肖礼；

【作者基本信息】 广西大学 ， 结构工程， 2004， 硕士

【摘要】 首先简单介绍了钢管混凝土的发展现状和前景、结构形式、钢管混凝土的力学性能以及在工程实际中的应用，其次介绍状态非线性接触理论在模拟钢管混凝土中的应用，最后介绍作者的研究工作。 对于圆形截面钢管混凝土紧箍力的研究已经相当成熟，而钢管混凝土拱桥常用截面是哑铃形截面，对该种形式截面的紧箍力及在轴心受压和小偏心情况下钢管混凝土应力状态大小及主应力分布缺乏了解。为搞清钢管混凝土构件所承受的复杂应力状态，以及钢管与核心混凝土之间存在的环向紧箍力作用，首先采用有限元法对哑铃形截面钢管混凝土短柱紧箍力的大小和分布情况进行研究，并深入分析了不同混凝土标号及含钢率对紧箍力的影响，弄清了腹腔部分混凝土的应力分布等受力特性，对该种柱的设计及进一步研究有较大的参考价值。然后还应用状态非线性接触理论对混凝土和钢管表面的相互接触过程进行了模拟，得出其接触应力分布情况以及在接触状态下哑铃形钢管混凝土的应力分布。最后以某哑铃形钢管混凝土拱桥工程实例进行整体及局部分析，提出了整体分析和局部分析的有限元处理方法，并对拱肋节点进行了模拟，得到在正常使用荷载作用下节点破坏时的失效因子。更多还原

【Abstract】 In this thesis , the application status and perspective of concrete-filled steel tube(CFST) are firstly introduced briefly, as well as its structural types, mechanical characters and engineering application. Consequently, the application of nonlinear finite element contact theory in simulating of CFST is presented. Then, the thesis put forward the author’s research.Although the study about bond stress in circular CFST section has become mature, the bond stress in dumbbell-shaped CFST section, a commonly used section in CFST arch bridges, is even unfamiliar, so are the value of bond stress, the mechanical state and the distribution of main stress in CFST under both axial compression and small eccentricity. To get known of the complex mechanical state of CFST component, and the round bond stress between steel tube and core concrete, this thesis firstly perform an analysis on the value and distribution of bond stress in short column with dumbbell-shaped section with finite element method (FEM). Meanwhile, further study on the influence of concrete standard and steel ratio on bond stress is carried out, acquiring mechanical properties of core concrete, such as the stress distribution, which offers important reference for design and further analysis about the column. Secondly, simulating of the contact process between concrete and steel tube surface is carried out with nonlinear finite element contact theory, acquiring the distribution of contact stress and the distribution of stress in dumbbell-shaped CFST under contact. Lastly, an actual arch bridge with dumbbell-shaped CFST is analyzed from global and local aspect, finite element methods of global analysis and local one are put forward. Through the simulating of arch rib joints, the failure coefficient of joints in destruction under normal service order is obtained.更多还原