本文選題：大跨空間屋蓋 + 風(fēng)壓分布��； 參考：《上海交通大學(xué)》2015年碩士論文

【摘要】：大跨空間屋蓋以其造型豐富、材料節(jié)省、可利用空間大、適應(yīng)性強(qiáng)等特點(diǎn)備受青睞,在機(jī)場(chǎng)航站樓、展覽館、體育館、工業(yè)廠房等大型建筑中廣泛應(yīng)用。然而此類結(jié)構(gòu)質(zhì)量輕、跨度大、柔性大、自振頻率低,結(jié)構(gòu)對(duì)風(fēng)荷載敏感,風(fēng)荷載往往是結(jié)構(gòu)設(shè)計(jì)的控制荷載。風(fēng)荷載作為一種隨機(jī)動(dòng)力荷載,其作用下的結(jié)構(gòu)動(dòng)力響應(yīng)計(jì)算涉及結(jié)構(gòu)動(dòng)力學(xué)、隨機(jī)振動(dòng)、風(fēng)荷載特性以及風(fēng)與結(jié)構(gòu)耦合的相互作用。為了便于設(shè)計(jì)人員掌握風(fēng)荷載的設(shè)計(jì)方法,風(fēng)工程研究者提出等效靜風(fēng)荷載的概念(Equivalent Static Wind Load,ESWL)。本文從大跨空間結(jié)構(gòu)工程抗風(fēng)問(wèn)題出發(fā),闡述了大跨空間結(jié)構(gòu)風(fēng)壓風(fēng)場(chǎng)數(shù)值模擬方法,以架空碟形空間結(jié)構(gòu)為例,分析了風(fēng)向角、支撐柱高度、上下碟面矢跨比對(duì)碟形空間結(jié)構(gòu)風(fēng)壓分布及風(fēng)致合力的影響;針對(duì)大跨拱形屋蓋、大跨多折面形屋蓋,分析了屋蓋風(fēng)壓分布規(guī)律;利用MATLAB自編程序?qū)崿F(xiàn)了基于諧波疊加法的風(fēng)速時(shí)程數(shù)值模擬,以此為數(shù)值風(fēng)洞入口邊界條件,基于FLUENT軟件平臺(tái)對(duì)結(jié)構(gòu)進(jìn)行非穩(wěn)態(tài)分析,獲得結(jié)構(gòu)動(dòng)力時(shí)程風(fēng)荷載;利用ANSYS軟件建立結(jié)構(gòu)有限元模型,結(jié)合有限元?jiǎng)恿r(shí)程分析法,對(duì)結(jié)構(gòu)進(jìn)行風(fēng)振響應(yīng)分析;在此基礎(chǔ)上,結(jié)合結(jié)構(gòu)特定時(shí)刻的瞬時(shí)風(fēng)壓分布,得到單目標(biāo)等效靜風(fēng)荷載;給出了多目標(biāo)等效靜風(fēng)荷載加權(quán)組合系數(shù)的定義,基于荷載響應(yīng)相關(guān)系數(shù)對(duì)單目標(biāo)等效靜風(fēng)荷載進(jìn)行組合,獲得了多目標(biāo)等效靜風(fēng)荷載;以大跨開敞式拱形屋蓋結(jié)構(gòu)和多折面形屋蓋結(jié)構(gòu)實(shí)際工程為例,計(jì)算獲得多目標(biāo)等效靜風(fēng)荷載分布,并與動(dòng)力時(shí)程分析結(jié)果進(jìn)行對(duì)比,驗(yàn)證了本文多目標(biāo)等效靜風(fēng)荷載方法的正確性。
[Abstract]:Long-span space roof has been widely used in airport terminal, exhibition hall, gymnasium, industrial workshop and other large buildings because of its rich shape, saving materials, large usable space, strong adaptability and so on. However, such structures are light in weight, large in span, flexible, low in natural vibration frequency and sensitive to wind loads, which are often the control loads of structural design. As a kind of random dynamic load, the dynamic response calculation of structure under the action of wind load involves structural dynamics, random vibration, wind load characteristics and the interaction between wind and structure. In order to facilitate designers to master the design method of wind load, wind engineering researchers put forward the concept of equivalent wind load (ESWL). In this paper, the numerical simulation method of wind pressure and wind field of large span space structure is expounded based on the problem of wind resistance in large span space structure engineering. The wind direction angle and the height of supporting column are analyzed with the example of aerial disc space structure. The wind pressure distribution and wind-induced force of the disk-shaped spatial structure are analyzed, and the wind pressure distribution of the large-span arched roof and the large-span multi-facet roof is analyzed. The numerical simulation of wind speed time history based on harmonic superposition method is realized by using MATLAB software, which is regarded as the entry boundary condition of numerical wind tunnel. The unsteady state analysis of the structure is carried out based on fluent software platform, and the dynamic time-history wind load of the structure is obtained. The finite element model of the structure is established by using ANSYS software, and the wind-induced vibration response of the structure is analyzed by using the finite element dynamic time-history analysis method, and on this basis, the equivalent static wind load with single objective is obtained by combining the instantaneous wind pressure distribution of the structure at a specific time. The definition of multi-objective equivalent static wind load weighted combination coefficient is given. Based on the load response correlation coefficient, the single-objective equivalent static wind load is combined and the multi-objective equivalent static wind load is obtained. Taking the large span open arch roof structure and multi-folded roof structure as examples, the equivalent static wind load distribution of multi-objective is calculated and compared with the results of dynamic time-history analysis. The validity of the multi-objective equivalent static wind load method is verified.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU312.1

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