本文關(guān)鍵詞：寧波國際會展中心屋蓋結(jié)構(gòu)風振響應(yīng)分析　出處：《華南理工大學(xué)》2010年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨度空間結(jié)構(gòu) 風速時程 AR模型 逆傅里葉變換 風振響應(yīng) 風振系數(shù)

【摘要】： 大跨度空間網(wǎng)架結(jié)構(gòu)是工程中應(yīng)用十分廣泛結(jié)構(gòu)形式,相對于索膜等柔性結(jié)構(gòu),該類結(jié)構(gòu)的風振響應(yīng)問題還沒有引起足夠重視。 本文以寧波國際會展中心(二期)大跨度網(wǎng)架屋蓋結(jié)構(gòu)風振響應(yīng)為研究對象,對該結(jié)構(gòu)的風振響應(yīng)進行了計算機模擬仿真分析。本文主要研究工作包括以下幾方面: 1.本文以實際工程為算例,利用ANSYS命令流進行力學(xué)建模,考慮結(jié)構(gòu)節(jié)點間的風速時程相關(guān)性,采用AR模型模擬節(jié)點隨機脈動風速時程,使用自行編制的相關(guān)程序,進行了AR法和快速逆傅里葉變換(IFFT)的計算。計算結(jié)果表明該方法可有效地模擬具有時間相關(guān)性、空間相關(guān)性的節(jié)點脈動風速時程。得到的風速時程樣本的功率譜密度與目標曲線吻合很好。另外還討論了時間間隔和自回歸階數(shù)的取值對結(jié)構(gòu)風荷載模擬的影響。 2.用ANSYS軟件對結(jié)構(gòu)進行自振特性分析,在上述工作的基礎(chǔ)上計算了結(jié)構(gòu)的風振響應(yīng),探討了風速、豎向風、阻尼比、網(wǎng)架高度等基本參數(shù)變化對結(jié)構(gòu)風振響應(yīng)計算結(jié)果的影響。 3.根據(jù)算例分析結(jié)果指出現(xiàn)行規(guī)范設(shè)計方法對空間網(wǎng)架結(jié)構(gòu)不適用之處,認為空間網(wǎng)架結(jié)構(gòu)位移風振系數(shù)和內(nèi)力風振系數(shù)不同,進而探討了結(jié)構(gòu)參數(shù)變化對位移風振系數(shù)和內(nèi)力風振系數(shù)的影響,所得結(jié)果和結(jié)論為設(shè)計人員進行工程設(shè)計提供了參考。
[Abstract]:Large-span space truss structures are widely used in engineering. Compared with flexible structures such as cable and film, the problem of wind-induced vibration response of long-span space truss structures has not been paid enough attention to. In this paper, the wind-induced vibration response of large-span truss roof structure of Ningbo International Convention and Exhibition Center (second phase) is taken as the research object. The wind-induced vibration response of the structure is simulated and analyzed by computer. The main research work in this paper includes the following aspects: 1. Taking the actual engineering as an example, using the ANSYS command stream to model the mechanics, considering the correlation of wind speed between the structural nodes, the AR model is used to simulate the random pulsating wind speed time history of the nodes. The AR method and the Fast inverse Fourier transform (FFT) IFFTs are calculated by using the self-compiled program. The results show that the proposed method can be used to simulate the temporal correlation effectively. The power spectral density of the wind speed sample obtained is in good agreement with the target curve. In addition, the influence of the time interval and the autoregressive order on the wind load simulation of the structure is also discussed. . 2. The natural vibration characteristics of the structure are analyzed by ANSYS software. Based on the above work, the wind-induced vibration response of the structure is calculated, and the wind speed, vertical wind and damping ratio are discussed. The influence of the basic parameters such as the height of the grid structure on the calculation results of the wind-induced vibration response of the structure. 3. According to the result of example analysis, it is pointed out that the current code design method is not applicable to space grid structure, and it is considered that the displacement wind vibration coefficient and internal force wind vibration coefficient of space grid structure are different. Furthermore, the influence of structural parameters on the wind vibration coefficient of displacement and the wind vibration coefficient of internal force is discussed. The results and conclusions provided a reference for designers to carry out engineering design.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：TU312.1

【引證文獻】

相關(guān)碩士學(xué)位論文 前1條

1 徐牧;索穹頂結(jié)構(gòu)風振響應(yīng)研究[D];華南理工大學(xué);2011年

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本文編號：1431327