【作者】 李元初；

【导师】 杨佑发；

【作者基本信息】 重庆大学 ， 结构工程， 2008， 硕士

【摘要】 水平加强层能够有效地减小高层筒体结构在侧向水平荷载作用下的侧向位移。但带水平加强层的高层筒体结构在地震作用下表现出了非常复杂的反应特性,加强层的设置不仅能引起结构竖向刚度的突变,引起结构内力的重分布;而且容易在加强层附近形成薄弱层。因此,对这类结构必须进行详尽而准确的分析研究,掌握其在侧向荷载作用下的反应规律以及结构在地震特别是大震下的塑性屈服机制;开展这方面的工作具有很强的实际意义。针对这些命题,本文完成以下几个方面的工作:(1)通过多个算例计算,分析了水平加强层减小结构侧移的力学机理;分析了结构在设置加强层后引起的内力重分布现象。(2)运用高层连续化分析方法,建立顶部带水平伸臂的框架-筒体结构侧移和内力的解析表达式,对结构进行了定量分析。(3)通过多种加强层设置方案探讨了加强层对筒中筒结构外框筒柱剪力滞后效应的影响。(4)进行了多种加强层结构的静力弹塑性分析,研究其在地震作用下的塑性屈服机制和延性性能;指出结构在大震作用下加强层附近会形成薄弱层,结构设计中必须采取相应的措施保证其变形能力。(5)以超高层算例分析为基础,探讨了带水平加强层的高层筒体结构的动力反应,指出加强层引起的刚度、内力突变问题和引起的薄弱层,为设计提供一些建议。更多还原

【Abstract】 Horizontal strengthened stories can effectively reduce the lateral displacement of the high-rise tubular structures under lateral load. But the high-rise tubular structures with horizontal strengthened stories displayed the extremely complex response characteristic under the earthquake action, the setting of Horizontal strengthened stories can not only cause the mutation of vertical stiffness, and the redistribution of the structural internal force, but also easily form weak stories nearby the horizontal strengthened stories. Therefore, we must do detailed and accurate study and analysis on this kind of structure, master the response regularity of structure under the lateral load action and the plastic yield mechanism under the earthquake action especial under the rare earthquake action. It has very strong practical significance to develop work in this aspect. Acording to this propositions in this field, in this paper, several aspects work has been finished:(1) By several example discussion, We analyze the mechanical mechanism that the horizontal strengthened stories reduce structural lateral displacement, and analyze internal force redistribution phenomenon which is caused by the establishment of horizontal strengthened stories.(2) Based on the method of continuous analysis for the high-rise structure, the analytical expression of lateral displacement and internal force for the frame-tubular structure with horizontal strengthened stories are established, and quantitative analysis have finished on this aspect structure.(3) The influence of strengthened stories on the shear lag effect of the outer frame- tube in tube-in-tube structure is discussed through several examples.(4) The static elastic-plastic analysis (push-over analysis) on various structures are presented with horizontal strengthened stories, the plastic yield mechanism and ductility performance under earthquake action have been discussed in this paper. It is pointed out that weak stories will be formed nearby the horizontal strengthened stories. In the design we must take corresponding measures to ensure the deformability of the structure under rare earthquake action.(5) Based on the analysis of super high-rise structure, elastic dynamic response of the structure with horizontal strengthened stories is discussed, t the mutation of stiffness and internal forces and weak stories caused by strengthened stories are pointed out, then give some suggestions on designing this structure.更多还原