本文選題：800　切入點(diǎn)：m跨度柱面網(wǎng)殼　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著科技的發(fā)展,建造千米級(jí)“城市穹頂”成為了人們對(duì)未來(lái)建筑的設(shè)想。隨著設(shè)想的提出,許多問題便成為了工程師們面臨的挑戰(zhàn),如在大體量室內(nèi)空間的風(fēng)環(huán)境舒適性調(diào)控,穹頂外部的抗風(fēng)問題等等。本文以800m跨度柱面網(wǎng)殼為例,對(duì)其室內(nèi)外風(fēng)場(chǎng)以及風(fēng)振響應(yīng)特性進(jìn)行了研究分析,主要研究?jī)?nèi)容包括以下方面:1、800m跨度柱面網(wǎng)殼室內(nèi)風(fēng)環(huán)境研究基于CFD流體分析軟件FLUENT,建立太陽(yáng)照射和正常通風(fēng)條件下室內(nèi)風(fēng)環(huán)境分析模型,探討了自然通風(fēng)口設(shè)置對(duì)室內(nèi)風(fēng)環(huán)境的影響。分析了自然通風(fēng)不同進(jìn)排風(fēng)口大小、進(jìn)排風(fēng)口高差、排風(fēng)口形式和不同密集程度建筑物群條件下通風(fēng)效果的差異;研究了機(jī)械通風(fēng)分層調(diào)控形式下不同氣流組織形式和不同動(dòng)力形式對(duì)室內(nèi)風(fēng)環(huán)境舒適度的影響。2、風(fēng)壓分布特性數(shù)值模擬和分析超大跨度建筑結(jié)構(gòu)一般都具有質(zhì)量輕、剛度小、自振頻率低等特點(diǎn),對(duì)風(fēng)荷載十分敏感,其風(fēng)壓系數(shù)分布的研究對(duì)工程設(shè)計(jì)意義重大。規(guī)范對(duì)于相似外形的落地拱屋面的風(fēng)荷載規(guī)定能否直接應(yīng)用于800m跨度柱面網(wǎng)殼設(shè)計(jì)中,還不明確;因此,采用經(jīng)過準(zhǔn)確性驗(yàn)證的CFD數(shù)值模擬方法對(duì)不同形式的網(wǎng)殼進(jìn)行風(fēng)壓系數(shù)分布的數(shù)值模擬,分析800m跨度柱面網(wǎng)殼的風(fēng)荷載分布特性;將模擬結(jié)果和現(xiàn)行荷載規(guī)范對(duì)比,探討規(guī)范條文的適用性,并且分析了風(fēng)向角、矢跨比、尺寸效應(yīng)和縱橫比對(duì)風(fēng)壓系數(shù)分布的影響。結(jié)果表明,現(xiàn)行荷載規(guī)范條文無(wú)法直接應(yīng)用于超大跨度柱面網(wǎng)殼的設(shè)計(jì);矢跨比對(duì)風(fēng)壓系數(shù)的分布影響最大,縱橫比的影響次之,矢跨比一定時(shí),網(wǎng)殼結(jié)構(gòu)風(fēng)荷載尺度效應(yīng)不明顯。3、800m跨度柱面網(wǎng)殼風(fēng)振響應(yīng)特性分析基于MATLAB軟件采用自回歸方法對(duì)風(fēng)速脈動(dòng)進(jìn)行數(shù)值模擬,根據(jù)模擬得到的脈動(dòng)風(fēng)速時(shí)程,建立800m跨度懸索支撐拱桁架結(jié)構(gòu)有限元模型,進(jìn)行了風(fēng)振響應(yīng)時(shí)程分析,研究了網(wǎng)殼的風(fēng)振響應(yīng)特性。分析得到800m跨度柱面網(wǎng)殼結(jié)構(gòu)的風(fēng)振系數(shù),得到所有節(jié)點(diǎn)風(fēng)振系數(shù)平均值為1.8;僅考慮平均風(fēng)對(duì)結(jié)構(gòu)的靜力作用是不安全的,風(fēng)速脈動(dòng)引起結(jié)構(gòu)的風(fēng)振響應(yīng)不可忽略。
[Abstract]:With the development of science and technology, the construction of kilometer-scale "urban dome" has become the vision of future architecture.With the development of the idea, many problems have become a challenge to engineers, such as the comfort control of wind environment in large indoor space, the wind resistance problem outside the dome and so on.Taking 800m span cylindrical reticulated shell as an example, the indoor and outdoor wind field and wind vibration response characteristics are studied and analyzed in this paper.The main research contents include the following aspects: 1: 1800m span cylindrical reticulated shell indoor wind environment research. Based on CFD fluid analysis software fluent, the indoor wind environment analysis model under solar irradiation and normal ventilation is established.The influence of natural vent setting on indoor wind environment is discussed.The difference of ventilation effect under the condition of natural ventilation with different size of inlet and outlet, the difference of inlet and outlet height, the form of outlet and the density of buildings were analyzed.In this paper, the effects of different airflow organization and different power forms on indoor wind environment comfort under the condition of mechanical ventilation stratification control are studied. Numerical simulation and analysis of wind pressure distribution characteristics are generally of light weight and low stiffness.Since the natural vibration frequency is low, it is sensitive to wind load, and the study of wind pressure coefficient distribution is of great significance to engineering design.It is not clear whether the specification of wind load of the similar shape of landing arch roof can be directly applied to the design of 800m span cylindrical latticed shell; therefore,The wind load distribution characteristics of 800m span cylindrical latticed shells are analyzed by numerical simulation of wind pressure coefficient distribution of different types of latticed shells by using CFD numerical simulation method, and the simulation results are compared with the current load codes.The applicability of the specification is discussed, and the effects of wind direction angle, rise-span ratio, dimension effect and aspect ratio on the distribution of wind pressure coefficient are analyzed.The results show that the current load code can not be directly applied to the design of super-span cylindrical latticed shells, the distribution of wind pressure coefficient is the most important, the aspect ratio is the second, and when the rise-span ratio is fixed, the distribution of wind pressure coefficient is the most important.Analysis of Wind Vibration response of Cylindrical latticed Shell with a Span of 3800m; numerical Simulation of Wind Velocity pulsation based on MATLAB Software, according to the time History of fluctuating Wind Velocity obtained by Simulation, the scale effect of Wind load on reticulated Shell structure is not obvious.The finite element model of 800m span suspension cable supported arch truss structure is established. The wind vibration response time history analysis is carried out and the wind vibration response characteristics of the latticed shell are studied.The wind vibration coefficient of 800 m span cylindrical latticed shell structure is obtained, and the average wind vibration coefficient of all nodes is 1.8. It is not safe to consider the static effect of average wind on the structure only, and the wind vibration response caused by wind speed pulsation can not be ignored.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU399;TU312.1

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