本文關(guān)鍵詞：大跨度結(jié)構(gòu)風(fēng)致雪漂模擬研究　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨度結(jié)構(gòu) 雪荷載 風(fēng)致雪漂 數(shù)值模擬 計(jì)算流體力學(xué)

【摘要】：隨著社會(huì)的進(jìn)步大跨度結(jié)構(gòu)的建設(shè)得到蓬勃發(fā)展。但由于雪荷載過大或結(jié)構(gòu)承載力下降等原因造成的大跨度結(jié)構(gòu)屋蓋倒塌事故時(shí)有發(fā)生。近年來國內(nèi)外暴雪災(zāi)害不斷,雪災(zāi)造成的房屋倒塌嚴(yán)重威脅人民的生命安全。尤其是由于風(fēng)致雪漂作用在建筑物表面形成的不均勻雪荷載,往往對(duì)結(jié)構(gòu)受力更不利,所以非常有必要對(duì)大跨度結(jié)構(gòu)表面的風(fēng)致雪漂進(jìn)行研究。本文對(duì)風(fēng)致雪漂的數(shù)值模擬理論基礎(chǔ)進(jìn)行總結(jié)。解釋了風(fēng)致雪漂現(xiàn)象的產(chǎn)生原因和運(yùn)動(dòng)方式,詳細(xì)闡述了風(fēng)致雪漂數(shù)值模擬的數(shù)學(xué)模型和風(fēng)致雪漂數(shù)值模擬的各個(gè)關(guān)鍵參數(shù)的選取,總結(jié)出對(duì)風(fēng)致雪漂進(jìn)行數(shù)值模擬的兩種不同方法——雪相控制方程求解法和MIXTURE多相流模型求解方法。對(duì)廣饒國際博覽中心展廳大跨度弦支網(wǎng)架結(jié)構(gòu)性能進(jìn)行分析,通過方案對(duì)比,發(fā)現(xiàn)該體系能在結(jié)構(gòu)高度較小時(shí)滿足大跨度大空間的要求,且結(jié)構(gòu)用鋼量較省,結(jié)構(gòu)剛度較大,同時(shí)動(dòng)力性能明顯優(yōu)于平板網(wǎng)架;不同分布的雪荷載尤其是不均勻雪荷載對(duì)結(jié)構(gòu)的受力影響較大,考慮雪漂作用形成的不均勻雪荷載在結(jié)構(gòu)設(shè)計(jì)時(shí)非常有必要。以氣象資料為基礎(chǔ),通過統(tǒng)計(jì)分析估算出2013年至2014年冬季廣饒國際博覽中心附近的實(shí)際地面雪壓;基于雙坡屋面的風(fēng)致雪漂在背風(fēng)面呈三角形分布的假設(shè),對(duì)博覽中心展廳的雙坡屋面在2013年至2014年冬季實(shí)際降雪情況下的由風(fēng)致雪漂形成的雪漂荷載進(jìn)行模擬,發(fā)現(xiàn)由于當(dāng)?shù)?013年至2014年冬季降雪較少,風(fēng)速不大,所以雙坡屋面的實(shí)際雪漂荷載較小。對(duì)計(jì)算域分別進(jìn)行結(jié)構(gòu)化網(wǎng)格、非結(jié)構(gòu)化網(wǎng)格和混合網(wǎng)格劃分,基于FLUENT軟件采用雪相控制方程求解法和MIXTURE多相流模型求解法對(duì)一球形網(wǎng)殼和于家堡貝殼形網(wǎng)殼進(jìn)行風(fēng)致雪漂數(shù)值模擬。利用C語言對(duì)FLUENT軟件進(jìn)行二次開發(fā),得到屋蓋表面積雪發(fā)生侵蝕和沉積后產(chǎn)生的不均勻雪荷載。對(duì)比不同網(wǎng)格劃分和模擬方法對(duì)風(fēng)致雪漂模擬結(jié)果的影響,發(fā)現(xiàn)結(jié)構(gòu)化網(wǎng)格的計(jì)算結(jié)果優(yōu)于混合網(wǎng)格,混合網(wǎng)格的計(jì)算結(jié)果優(yōu)于非結(jié)構(gòu)化網(wǎng)格;雪相控制方程求解方法的計(jì)算結(jié)果優(yōu)于MIXTURE多相流模型求解方法。對(duì)大跨度結(jié)構(gòu)風(fēng)致雪漂現(xiàn)象數(shù)值模擬的網(wǎng)格劃分方式和數(shù)值模擬方法提出合理建議。
[Abstract]:With the development of society, the construction of long-span structure has been developed vigorously, but the collapse accident of long-span structure roof caused by excessive snow load or structural bearing capacity has occurred frequently in recent years. In recent years, blizzard disaster occurred at home and abroad. All the time. The collapse of houses caused by snow disaster is a serious threat to the safety of people's lives, especially because of the uneven snow load formed on the surface of buildings due to wind-induced snow drift, which is often more disadvantageous to the structure. Therefore, it is very necessary to study the wind-induced snow drift on the surface of long-span structures. In this paper, the theoretical basis of the numerical simulation of wind-induced snow drift is summarized, and the causes and motion of wind-induced snow drift are explained. The mathematical model of wind-induced snow drift numerical simulation and the selection of key parameters of wind-induced snow drift numerical simulation are described in detail. Two different methods for numerical simulation of wind-induced snow drift, snow phase control equation solution and MIXTURE multiphase flow model, are summarized. The large-span chord-supported grid structure of exhibition hall of Guangrao International Expo Center is studied. Performance analysis. Through the comparison of schemes, it is found that the system can meet the requirements of large span and large space when the height of the structure is small, and the amount of steel used in the structure is less, the stiffness of the structure is larger, and the dynamic performance of the system is obviously better than that of the plate grid. Different distribution of snow load, especially uneven snow load, has a great influence on the structure. It is necessary to take account of snow drift in the design of the structure, based on meteorological data. The actual surface snow pressure near Guangrao International Expo Center from 2013 to 2014 is estimated by statistical analysis. Based on the assumption that the wind-induced snow drifts on the leeward surface of the double-slope roof, it is assumed that the snow floats on the leeward surface. The snowdrift load caused by wind-induced snow drift is simulated on the double-slope roof of the exhibition hall of the Expo Center during the winter snowfall from 2013 to 2014. It is found that the actual snow drift load of the double-slope roof is smaller because of the small snowfall and small wind speed in the local winter from 2013 to 2014. Unstructured grid and hybrid grid partitioning. The wind-induced snow drift of a spherical reticulated shell and a shell reticulated shell of Yujiabao were simulated by using the snow phase control equation solution method and the MIXTURE multiphase flow model solution method based on FLUENT software. The second development of LUENT software is carried out. The uneven snow load caused by snow erosion and deposition on the roof surface is obtained, and the effects of different mesh generation and simulation methods on the simulation results of wind-induced snow drift are compared. It is found that the computational result of structured grid is better than that of hybrid grid, and that of hybrid grid is better than that of unstructured grid. The calculation result of snow phase control equation is better than that of MIXTURE multiphase flow model. Some reasonable suggestions are put forward for the grid generation and numerical simulation of wind-induced snow drift phenomenon in long-span structures. .
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU356;TU312.1

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