施威德勒弦支穹顶结构的稳定性及抗震性能研究

发布时间：2018-03-17 22:20

本文选题：弦支穹顶结构　切入点：稳定性分析　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：弦支穹顶结构是由上部单层网壳和下部索承体系相结合的一种新型复杂的空间结构。相比单层网壳结构弦支穹顶结构受力更加合理，施工简便以及经济效益良好。而施威德勒弦支穹顶克服了肋环型结构整体刚度差的缺点，能够很好的适用于大中跨度。鉴于近几年弦支穹顶结构在诸多国际重大活动中应用的增多以及地震灾害的频发，，对此类结构有必要进行整体稳定以及抗震性能等方面的研究。本文首先利用ANSYS有限元分析软件建立了施威德勒弦支穹顶结构模型，对其进行线性和非线性屈曲分析。通过考虑矢跨比、撑杆高度以及环径比对结构整体稳定性能的影响以及和单层网壳进行对比，论证了弦支穹顶结构的优越性。然后，本文分析了结构的自振特性，计算出结构的自振频率和振型，同时与单层网壳进行了对比分析。通过分析矢跨比、荷载大小、撑杆高度以及环径比等参数对结构自振频率的影响，总结出了结构自振特性随各参数变化的基本规律。最后，本文采用时程分析法，通过输入典型的EL-centro波和Taft波提取了在水平向、竖向以及XZ两维地震作用下的X和Z向时程位移曲线和杆件内力，掌握了施威德勒弦支穹顶结构地震反应的基本规律。对结构的地震响应进行了参数分析，提取了杆件的最大内力响应，总结了矢跨比和撑杆高度等参数对结构动力水平的影响。
[Abstract]:The chord dome is a new complex spatial structure which is composed of the upper monolayer reticulated shell and the lower cable-supported system, which is more reasonable than the single-layer latticed dome structure. The construction is simple and economic benefit is good, and Schweidler chord dome overcomes the shortcoming of the whole stiffness of ribbed ring structure. In view of the increasing application of dome structures in recent years and the frequent occurrence of earthquake disasters, it is necessary to study the overall stability and seismic performance of such structures. In this paper, the Schweidler dome structure model is established by using ANSYS finite element analysis software, and the linear and nonlinear buckling analysis of the dome is carried out. The influence of the height of bracing rod and the ratio of ring to diameter on the overall stability of the structure and the comparison with the single-layer latticed shell demonstrate the superiority of the chord dome structure. Then, the natural vibration characteristics of the structure are analyzed, and the natural vibration frequency and mode shape of the structure are calculated. At the same time, the structure is compared with the single-layer latticed shell. The influence of the parameters such as the height of the strut and the ratio of ring to diameter on the natural vibration frequency of the structure is summarized, and the basic law of the natural vibration characteristics of the structure with the variation of the parameters is summarized. Finally, the X and Z time-history displacement curves and the member internal forces under horizontal, vertical and XZ two dimensional earthquakes are extracted by means of time history analysis and the input of typical EL-centro and Taft waves. The basic law of seismic response of Schweidler dome structure is mastered. The seismic response of the structure is analyzed, the maximum internal force response of the member is extracted, and the influence of the parameters such as rise-span ratio and brace height on the dynamic level of the structure is summarized.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU399;TU352.11

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