本文關(guān)鍵詞：某高層建筑頂層大空間屋蓋結(jié)構(gòu)方案優(yōu)化分析研究　出處：《廣西大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高層框架-剪力墻結(jié)構(gòu)結(jié) 構(gòu)優(yōu)化 頂層大空間結(jié)構(gòu) 豎向剛度突變 抗震性能

【摘要】：本文以某頂層大空間高層框架-剪力墻結(jié)構(gòu)為工程背景,首先針對該工程設(shè)計方案中采用的屋蓋形式進行進一步的選型和優(yōu)化。同時,本文根據(jù)抗震設(shè)計規(guī)范和高層建筑混凝土結(jié)構(gòu)技術(shù)規(guī)程的相關(guān)要求,對該結(jié)構(gòu)進行了多遇地震下的彈性抗震性能和罕遇地震下的彈塑性抗震性能分析,為類似實際工程提供了依據(jù)。本文研究工作和研究成果如下： (1)對屋蓋結(jié)構(gòu)的進一步選型和優(yōu)化。針對該工程的設(shè)計方案提出三種常用的屋蓋形式：井字梁屋蓋、網(wǎng)架屋蓋、柱面網(wǎng)殼屋蓋。采用振型分解反應(yīng)譜法,利用SATWE和MIDAS/GEN進行建模分析,比較了井字梁正放和斜放時的受力性能,研究了網(wǎng)架以及不同矢跨比的網(wǎng)殼對大空間層柱內(nèi)力的影響,并且比較了幾種方案的經(jīng)濟指標。結(jié)果表明采用網(wǎng)架屋蓋結(jié)構(gòu)方案更為經(jīng)濟合理。 (2)頂層大空間的結(jié)構(gòu),由于豎向剛度的突然減少,在高階振型和鞭梢效應(yīng)的影響下,從而使震害加重,對抗震十分不利。本文選用三條地震波,對幾種方案進行了多遇地震下的彈性動力時程分析補充計算。結(jié)果說明,彈性時程分析得到的結(jié)構(gòu)響應(yīng)均小于反應(yīng)譜法的結(jié)果,用反應(yīng)譜計算是比較保守的。此外,頂層加速度值的放大倍數(shù)比較大,驗證了此類結(jié)構(gòu)的鞭梢效應(yīng)。 (3)考慮高階振型的影響,采用多模態(tài)加載方式對結(jié)構(gòu)進行罕遇地震下的Pushover推覆分析,并對該結(jié)構(gòu)的抗震性能進行評估。結(jié)果表明,結(jié)構(gòu)出現(xiàn)了性能點,塑性鉸首先出現(xiàn)在梁端,而柱和墻沒有出現(xiàn)塑性鉸,符合“強柱弱梁”的設(shè)計原則。在剛度突變處,沒有出現(xiàn)明顯的薄弱層,塑性鉸發(fā)展和破壞過程比較合理。
[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.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU973.3

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本文編號：1438523