不同支承条件下双层柱面网壳结构动力性能研究

发布时间：2018-03-22 20:10

本文选题：双层柱面网壳　切入点：支承条件　出处：《青岛理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：双层柱面网壳结构是一种颇受国内外关注且有广阔发展前景的大跨度空间结构，而且国内学者在结构静、动力性能及抗震设计的研究领域取得了丰硕成果。但是，关于网壳结构在不同支承条件下动力性能方面的研究还不完善，特别是独立柱支承网壳结构地震反应方面的研究还不够。在现实工程中，网壳结构支承在钢柱上时，地震作用通过支承结构传给上部网壳屋盖，若不考虑下部支承结构刚度的影响，将会与实际情况产生较大的偏差。因此，对考虑不同支承条件下网壳结构在地震作用下的动力分析的研究有着重要意义。本文以青岛海上嘉年华门厅工程为背景，通过有限元分析软件SAP2000研究了双层正放四角锥形柱面网壳结构在不同的支座类型及支承刚度条件下对结构静、动力性能及地震反应的影响。首先，分析了双层柱面网壳结构在不同的支座类型及不同支承刚度条件下的静力性能，并在支座反力、杆件内力、节点位移方面与独立柱支承的网壳结构整体模型进行对比。其次，对四种支承条件下的网壳结构进行了模态分析，得出了不同支承条件下结构的自振频率及其对应振型，分析比较了网壳结构在不同支承条件下自振特性方面的差异。总结了网壳结构自振频率随支承刚度变化的规律，指出了利用弹性支座模型代替独立柱支承模型分析的关键因素。研究了网壳结构在不同支承条件下，矢跨比对结构基频的影响程度，得出对设计有参考价值的结论。最后，，对独立柱支承的网壳结构在6、7、8度多遇地震作用下进行振型分解反应谱分析，采用时程法对8度多遇地震进行补充分析，并比较了反应谱法与时程分析法计算结果的异同，同时和网壳结构的静力结果进行对比总结。
[Abstract]:The double-layer cylindrical latticed shell structure is a kind of large-span space structure which has attracted much attention at home and abroad and has broad prospects for development. Moreover, domestic scholars have made great achievements in the field of structural static, dynamic performance and seismic design. The study on the dynamic performance of latticed shell structures under different supporting conditions is not perfect, especially the study on the seismic response of latticed shell structures supported by independent columns. In practical engineering, the latticed shell structures are supported on steel columns. The seismic action is transmitted to the upper latticed shell roof through the supporting structure. If the stiffness of the lower supporting structure is not considered, there will be a big deviation from the actual situation. It is of great significance to study the dynamic analysis of latticed shell structures under earthquake action under different supporting conditions. Based on the Qingdao Marine Carnival Lobby Project, this paper studies the static behavior of the double-layered four-corner conical cylindrical reticulated shell structure under the conditions of different bearing types and supporting stiffness by using the finite element analysis software SAP2000. The influence of dynamic performance and seismic response. Firstly, the static behavior of double-layer cylindrical latticed shell structure under different support types and different supporting stiffness is analyzed, and compared with the integral model of the reticulated shell structure supported by independent columns in the aspects of support reaction force, internal force of rod and node displacement. Secondly, the modal analysis of the latticed shell structure under four kinds of supporting conditions is carried out, and the natural vibration frequency and the corresponding vibration modes of the structure under different supporting conditions are obtained. The differences of natural vibration characteristics of latticed shell structures under different supporting conditions are analyzed and compared. The variation of natural vibration frequency with support stiffness of latticed shell structures is summarized. The paper points out the key factors of using elastic support model to replace the independent column support model, studies the influence of rise-span ratio on the fundamental frequency of latticed shell structure under different supporting conditions, and draws a conclusion of reference value for design. Finally, the vibration mode decomposition response spectrum analysis of the reticulated shell structure supported by independent columns is carried out under the action of frequent earthquakes of 6 ~ 7 ~ 8 degrees, and an additional analysis of frequent earthquakes of 8 degrees is carried out by using the time-log method. The similarities and differences between the response spectrum method and the time-history analysis method are compared and compared with the static results of the reticulated shell structure.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU399;TU311.3

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