某高层建筑顶层大空间屋盖结构方案优化分析研究

发布时间：2018-01-18 00:00

本文关键词：某高层建筑顶层大空间屋盖结构方案优化分析研究　出处：《广西大学》2013年硕士论文　论文类型：学位论文

【摘要】：本文以某顶层大空间高层框架-剪力墙结构为工程背景,首先针对该工程设计方案中采用的屋盖形式进行进一步的选型和优化。同时,本文根据抗震设计规范和高层建筑混凝土结构技术规程的相关要求,对该结构进行了多遇地震下的弹性抗震性能和罕遇地震下的弹塑性抗震性能分析,为类似实际工程提供了依据。本文研究工作和研究成果如下： (1)对屋盖结构的进一步选型和优化。针对该工程的设计方案提出三种常用的屋盖形式：井字梁屋盖、网架屋盖、柱面网壳屋盖。采用振型分解反应谱法,利用SATWE和MIDAS/GEN进行建模分析,比较了井字梁正放和斜放时的受力性能,研究了网架以及不同矢跨比的网壳对大空间层柱内力的影响,并且比较了几种方案的经济指标。结果表明采用网架屋盖结构方案更为经济合理。 (2)顶层大空间的结构,由于竖向刚度的突然减少,在高阶振型和鞭梢效应的影响下,从而使震害加重,对抗震十分不利。本文选用三条地震波,对几种方案进行了多遇地震下的弹性动力时程分析补充计算。结果说明,弹性时程分析得到的结构响应均小于反应谱法的结果,用反应谱计算是比较保守的。此外,顶层加速度值的放大倍数比较大,验证了此类结构的鞭梢效应。 (3)考虑高阶振型的影响,采用多模态加载方式对结构进行罕遇地震下的Pushover推覆分析,并对该结构的抗震性能进行评估。结果表明,结构出现了性能点,塑性铰首先出现在梁端,而柱和墙没有出现塑性铰,符合“强柱弱梁”的设计原则。在刚度突变处,没有出现明显的薄弱层,塑性铰发展和破坏过程比较合理。
[Abstract]:In this paper, a high-rise frame-shear wall structure on the top floor is used as the engineering background. Firstly, the type selection and optimization of the roof used in the design scheme are carried out. At the same time. According to the requirements of seismic design code and technical specification for high-rise building concrete structure, the elastic seismic behavior of the structure under frequent earthquakes and the elastoplastic seismic behavior of the structure under rare earthquake are analyzed in this paper. It provides the basis for similar practical projects. The research work and results of this paper are as follows: 1) further selection and optimization of roof structure. According to the design scheme of this project, three common roof forms are put forward: well beam roof, reticulated roof, cylindrical reticulated shell roof. Vibration mode decomposition response spectrum method is used. By using SATWE and MIDAS/GEN to model and analyze, the mechanical performance of vertical and oblique beam is compared, and the influence of grid frame and reticulated shell with different rise-to-span ratio on the internal force of large space layer column is studied. The economic indexes of several schemes are compared and the results show that the scheme of truss roof structure is more economical and reasonable. Due to the sudden reduction of vertical stiffness and the effect of high-order vibration mode and whipping effect, the structure of large space on the top floor will aggravate the earthquake damage and be very unfavorable to the earthquake resistance. Three seismic waves are selected in this paper. The results show that the structural responses obtained by elastic time-history analysis are smaller than those obtained by the response spectrum method. The calculation of response spectrum is conservative. In addition, the amplification of the acceleration value of the top layer is relatively large, which verifies the whipping effect of this kind of structure. (3) considering the influence of high-order modes, the Pushover nappe analysis of the structure under rare earthquake is carried out by multi-modal loading method, and the seismic performance of the structure is evaluated. The structure has the performance point, the plastic hinge first appears in the beam end, but the column and the wall does not appear the plastic hinge, conforms to the "strong column weak beam" the design principle, in the stiffness abrupt place, does not appear the obvious weak layer. The development and failure process of plastic hinge is reasonable.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.3

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