【摘要】：近年來，大跨網(wǎng)殼結(jié)構(gòu)在體育館、工業(yè)廠房、博物館和車站等建筑中得到了大量的應(yīng)用。雖然現(xiàn)在大跨度結(jié)構(gòu)一般都是采用鋼結(jié)構(gòu)，但是木材由于其重量輕且具有一定的裝飾性，所以在大跨結(jié)構(gòu)中也有一定的使用。 無論是什么材料所構(gòu)成的大跨網(wǎng)殼結(jié)構(gòu)，由于其質(zhì)量輕，剛度小，，頻率集中等特點(diǎn)，都屬于風(fēng)敏感結(jié)構(gòu)�，F(xiàn)在很多關(guān)于大跨結(jié)構(gòu)的風(fēng)振響應(yīng)的研究是通過準(zhǔn)定常假定或者一些修正的假定將風(fēng)速向風(fēng)壓轉(zhuǎn)換，這對(duì)于大跨度結(jié)構(gòu)的適用性值得商榷。對(duì)于網(wǎng)殼特別是單層網(wǎng)殼的整體穩(wěn)定性的研究，主要是針對(duì)鋼結(jié)構(gòu)網(wǎng)殼，而對(duì)于木結(jié)構(gòu)單層網(wǎng)殼的研究基本沒有。本文主要以天津歡樂谷85m跨單層球形木結(jié)構(gòu)網(wǎng)殼為例，研究木結(jié)構(gòu)網(wǎng)殼的風(fēng)振響應(yīng)和整體穩(wěn)定性。 本文基于白噪聲濾波法（AR法）解決脈動(dòng)風(fēng)入口的輸入問題，通過大渦模擬（LES）得到網(wǎng)殼上各節(jié)點(diǎn)的風(fēng)壓時(shí)程，然后通過瞬態(tài)動(dòng)力學(xué)計(jì)算得到網(wǎng)殼各節(jié)點(diǎn)的風(fēng)振系數(shù)。與風(fēng)洞試驗(yàn)結(jié)果對(duì)比表明本文方法的計(jì)算結(jié)果和試驗(yàn)結(jié)果吻合較好，按該方法計(jì)算大跨結(jié)構(gòu)風(fēng)振響應(yīng)是可行的。通過本文方法，論文討論了木結(jié)構(gòu)網(wǎng)殼在不同豎向荷載、阻尼、邊界條件和荷載分布等參數(shù)作用下對(duì)于網(wǎng)殼風(fēng)振系數(shù)的影響。 對(duì)于整體穩(wěn)定性，本文通過計(jì)算木結(jié)構(gòu)球形單層網(wǎng)殼在半跨活荷載以及全跨活荷載下的屈曲特征值，無缺陷的穩(wěn)定承載力和引入初始缺陷后的網(wǎng)殼承載力，討論了網(wǎng)殼的初始缺陷、荷載分布和非線性對(duì)于木結(jié)構(gòu)網(wǎng)殼的整體承載力的影響。 本文采用的分析方法和各種影響因素的對(duì)比結(jié)果，以及風(fēng)振系數(shù)和整體穩(wěn)定性荷載的取值規(guī)律，可供類似結(jié)構(gòu)設(shè)計(jì)作為參考。
[Abstract]:In recent years, large span latticed shell structures have been widely used in gymnasiums, industrial buildings, museums and stations. Although steel structures are generally used in long-span structures nowadays, wood is also used in long-span structures because of its light weight and decorative properties. The large-span latticed shell structure, no matter what material it is, belongs to wind-sensitive structure because of its light weight, low stiffness and concentrated frequency. At present, many researches on the wind-induced vibration response of long-span structures are based on quasi-steady assumptions or some modified assumptions to convert wind speed to wind pressure. The applicability of this study to long-span structures is open to question. The overall stability of latticed shells, especially single-layer latticed shells, is mainly focused on steel latticed shells, but there is no research on single-layer latticed shells of wood structures. In this paper, the wind-induced vibration response and overall stability of single-layer spherical wooden shell with 85 m span in Huanghue Valley of Tianjin are studied as an example. Based on the white noise filtering (AR) method, the input problem of the pulsating wind inlet is solved. The wind pressure time history of each node on the reticulated shell is obtained by large eddy simulation (LES), and the wind-induced vibration coefficient of each node in the latticed shell is calculated by transient dynamics calculation. The comparison with the wind tunnel test results shows that the calculated results are in good agreement with the experimental results, and it is feasible to calculate the wind-induced vibration response of long-span structures by using this method. Through this method, the paper discusses the influence of different vertical load, damping, boundary condition and load distribution on the wind vibration coefficient of the latticed shell of wood structure. For global stability, the buckling eigenvalues of spherical single-layer latticed shells of wooden structures under semi-span live load and full-span live load are calculated, the load-carrying capacity of no-defect stable shell and the latticed shell with initial defect are calculated in this paper. The effects of initial defects, load distribution and nonlinearity of latticed shells on the overall bearing capacity of latticed shells are discussed. The analytical method adopted in this paper, the comparative results of various influencing factors, as well as the values of wind-induced vibration coefficient and global stability load, can be used as a reference for the design of similar structures.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU399;TU311.3

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