【作者】 刘景亮；

【导师】 张保印；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2003， 硕士

【摘要】 近几年来，随着国内外高层建筑越建越高，结构形式也越来越复杂。如何高效、准确地对这些复杂结构体系进行内力分析，已成为我国高层建筑领域亟待解决的问题。传统的结构分析是按照一次加载模式进行的，而施工阶段的钢筋混凝土结构是形状、材料性质以及所承受的荷载均随时间变化的时变结构。施工阶段结构受力与按传统方法计算的结果有很大的差别。 本文介绍了土木工程施工力学研究的基本理论，分析了混凝土的依时变形特性及其对施工阶段上部结构受力的影响，并研究了施工阶段高层及超高层建筑结构的荷载、抗力的时变特性及“刚度迟后”现象。 以超级元理论为基础，本文建立了高层筒中筒结构的简化施工力学计算模型，提出了“超级元-子结构有限元耦合法”。利用Ansys有限元程序对超高层筒中筒结构的施工过程进行了数值模拟，并结合一超高层建筑上部结构原位测试结果对施工过程中上部结构的受力进行了分析。分析表明：外框筒、剪力墙内筒以及内外筒之间均存在明显的“拱效应”，使结构中发生内力重分布。因此笔者建议在实际工程设计中采用合适的有限元软件考虑上部结构与地基、基础的共同作用对超高层建筑结构进行全过程的施工力学分析以作为设计的依据。更多还原

【Abstract】 In recent years , with the increase of height of super high-rise buildings, the structure types become more and more complex. How to analysize these complex structure systems is an urgent problem in the field of tall building of our country. Traditional structural analysis is based on the single load model. However , in the construction period the reinforced concrete structure is a kind of time-varing structure in which structure shape, material performance and loads are all time-varing. Structural response in the construction process has great difference from results calculated with traditional method.In the paper, the basic theory of construction mechanics is introduced. The time-dependant characteristics of concrete is discussed and its influence on structure response in the construction period is induced. Subsequently the rigidity-leg phenomenon and the time-varing feature of load and resistence in the super hige-rise building’ s conctruction period is analysized.Based on the super finite element theory a simplified computation model of construction mechanics toward high-rise tube in tube structure is brought forward and the super-element-minor-structure-coupling finite element method is established. Using ANSYS computer programme the construction process of super high-rise tube in tube structure is numerically simulated and the inner force of superstructure is analysized combined with on-site measurement data of a tube and tube structure. As analysis is shown, there are great "arching effects" in the inner tube and outer tube and also between two tubes. So i t is advised that some appropriate computer software consideringthe interaction of superstructure, base and soil should be adopted to analysize the response of super high-rise building through the construction process to provide reference to engineering design.更多还原