烟台景观塔整体稳定性分析

发布时间：2018-05-15 00:05

本文选题：复杂高层结构 + 整体稳定　；参考：《山东建筑大学》2015年硕士论文

【摘要】：烟台景观塔为烟台开发区一标志性景观建筑,其整体结构由下部八根大斜柱及上部内框架、外网筒等组成。结构体系组成复杂,结构布置不规则,属于复杂超限结构。现行规范对结构稳定的设计方法已不能满足该结构稳定设计的需要。综合考虑各种实际因素的影响,进行专项稳定设计研究,对进一步优化该结构的设计,加强结构的薄弱部位,提高结构的稳定承载能力十分必要。本文基于SAP2000建立了烟台景观塔空间有限元模型,通过特征值屈曲分析、P-△效应分析、几何非线性稳定分析,对该结构的稳定性能进行了深入探讨研究,研究结果表明：(1)在特征值屈曲分析中,大斜柱的屈曲滞后于整体结构屈曲,结构的特征值屈曲因子大于10,说明该结构具有良好的屈曲稳定性。在几何非线性分析中,外网筒、斜撑首先屈服,表现为良好的屈服机制。整体结构的临界荷载系数大于5,说明该结构具有良好的非线性稳定性。(2)斜柱的截面对结构的整体稳定极限承载能力影响不敏感,不宜通过加大斜柱截面的方式改善整体结构的稳定性能。(3)柱间支撑的布置方式对结构稳定承载力影响较显著。在结构的薄弱部位合理的布置支撑可有效地提高结构的稳定极限承载力。(4)随着连接短梁线刚度的增加,外网筒参与整体组合的作用增大,结构的整体抗侧刚度提高。分析表明,短梁线刚度在(0.265-0.318)X106KN.m之间,结构的稳定承载性能较好：当短梁连接节点为铰接或半刚性连接时结构的二阶效应远大于节点为刚接时结构的二阶效应,不容忽视。在结构设计时必须加强节点连接刚性,否则会高估结构的稳定承载能力。(5)景观塔的稳定性对结构的整体初始几何缺陷不敏感,但受大斜柱局部初始几何缺陷的影响较大,应注重大斜柱施工允许偏差的控制。
[Abstract]:Yantai landscape tower is an iconic landscape building in Yantai Development Zone. Its overall structure is composed of eight large inclined columns in the lower part, upper inner frame and outer net tube. The structure system is complex, the structure arrangement is irregular, and belongs to the complex over-limit structure. The design method of structural stability in current code can not meet the needs of structural stability design. It is necessary to further optimize the design of the structure, strengthen the weak position of the structure, and improve the stable bearing capacity of the structure by taking into account the influence of various practical factors. Based on SAP2000, the spatial finite element model of Yantai landscape tower is established in this paper. By means of eigenvalue buckling analysis and geometric nonlinear stability analysis, the stability performance of the structure is studied. The results show that in the eigenvalue buckling analysis, the buckling of the large oblique column lags behind the buckling of the whole structure, and the eigenvalue buckling factor of the structure is greater than 10, which indicates that the structure has good buckling stability. In geometric nonlinear analysis, the oblique braces yield first, showing a good yield mechanism. The critical load coefficient of the whole structure is greater than 5, which shows that the section of the inclined column is not sensitive to the ultimate bearing capacity of the whole structure. It is not advisable to improve the stability performance of the whole structure by increasing the cross section of the inclined column. The arrangement of bracing between columns has a significant effect on the stability bearing capacity of the structure. The reasonable arrangement of bracing in the weak part of the structure can effectively improve the ultimate bearing capacity of the structure. (4) with the increase of the stiffness of the connection short beam, the role of the outer net tube in the integral combination is increased, and the overall lateral stiffness of the structure is improved. The analysis shows that the linear stiffness of short beam is between 0.265-0.318x106KN.m, and the stable bearing capacity of the structure is better. When the connection joint is hinged or semi-rigid, the second-order effect of the structure is far greater than the second-order effect of the structure when the connection is rigid, and can not be ignored. In structural design, the connection rigidity must be strengthened, otherwise the stability of the landscape tower will be overestimated. The stability of the landscape tower is not sensitive to the whole initial geometric defect of the structure, but it is greatly affected by the local initial geometric defect of the large oblique column. Attention should be paid to the control of allowable deviations in the construction of large inclined columns.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU347;TU311.2

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