【摘要】：風(fēng)能是一種蘊(yùn)藏豐富,分布廣泛,清潔的可再生資源。目前,國(guó)內(nèi)已建成的風(fēng)電塔架多采用鋼塔形式。隨著大型兆瓦級(jí)風(fēng)力發(fā)電機(jī)組的發(fā)展,塔架的高度不斷變高,截面尺寸不斷變大,這就增加了塔段的制作和運(yùn)輸難度�；炷了芸梢越鉀Q制作和運(yùn)輸上的難題,但是由于其自重較大,單一的混凝土塔架不能滿足風(fēng)電塔架日益增長(zhǎng)的高度要求�；谝陨显�,將混凝土塔架和鋼塔架組合,充分發(fā)揮兩種材料的優(yōu)勢(shì),設(shè)計(jì)一種預(yù)應(yīng)力混凝土—鋼組合風(fēng)電塔架,為大型風(fēng)力發(fā)電機(jī)組的發(fā)展提供一種新途徑。在進(jìn)行組合風(fēng)力發(fā)電塔架結(jié)構(gòu)設(shè)計(jì)中,預(yù)應(yīng)力混凝土塔段與鋼塔段的連接是該結(jié)構(gòu)的關(guān)鍵部分。本文提出一種新型的連接段方案—鋼箱混凝土連接段,它可以提高連接段整體剛度,改善連接段鋼箱下部混凝土受力性能,使其應(yīng)力分布更加均勻,避免出現(xiàn)拉應(yīng)力。由于目前對(duì)預(yù)應(yīng)力混凝土—鋼組合風(fēng)電塔架連接段的設(shè)計(jì)與分析研究非常有限,因此本文通過(guò)對(duì)組合風(fēng)電塔架連接段開展數(shù)值分析以及試驗(yàn)研究工作,可以為我國(guó)組合風(fēng)電塔架的設(shè)計(jì)與研究提供參考。本文主要開展以下工作:(1)提出組合風(fēng)電塔架連接段的選型設(shè)計(jì),并通過(guò)對(duì)四種連接段方案的對(duì)比分析,得出鋼箱混凝土連接段具有顯著的優(yōu)勢(shì)。通過(guò)簡(jiǎn)化力學(xué)模型,計(jì)算分析鋼箱混凝土連接段的受力特點(diǎn)。(2)利用有限元分析軟件ABAQUS,對(duì)鋼箱混凝土連接段與傳統(tǒng)厚型法蘭盤連接段方案整體建模,并分別進(jìn)行彈性和彈塑性分析,對(duì)比兩種連接方案計(jì)算結(jié)果,得出鋼箱混凝土連接段在受力性能上的優(yōu)越性。(3)以2MW風(fēng)力發(fā)電塔架為研究對(duì)象,設(shè)計(jì)鋼箱混凝土連接段局部節(jié)點(diǎn)縮尺模型,利用液壓作動(dòng)器對(duì)其進(jìn)行靜力加載試驗(yàn)。通過(guò)分析試驗(yàn)構(gòu)件的力學(xué)行為,得出鋼箱混凝土連接段設(shè)計(jì)的合理性。(4)在鋼箱混凝土連接段試驗(yàn)研究的基礎(chǔ)上,對(duì)試驗(yàn)?zāi)Ｐ瓦M(jìn)行有限元建模分析,通過(guò)對(duì)比數(shù)值計(jì)算與試驗(yàn)結(jié)果,驗(yàn)證試驗(yàn)研究的準(zhǔn)確性。
[Abstract]:Wind energy is a kind of renewable resources which is rich, widely distributed and clean. At present, most of the wind power towers built in China are in the form of steel towers. With the development of large megawatt wind turbine, the height of tower is getting higher and the cross section size is getting bigger, which increases the difficulty of making and transportation of tower section. Concrete tower can solve the difficult problems in manufacture and transportation, but because of its large weight, a single concrete tower can not meet the increasing height requirements of wind power tower. Based on the above reasons, the concrete tower and steel tower are combined to give full play to the advantages of the two materials, and a prestressed concrete-steel composite wind turbine tower is designed, which provides a new way for the development of large wind turbine. In the design of composite wind power tower structure, the connection between prestressed concrete tower and steel tower is the key part of the structure. In this paper, a new type of connection section, steel box concrete connection section, is proposed, which can improve the overall stiffness of the connection section, improve the mechanical properties of the lower part of the steel box, make the stress distribution more uniform, and avoid tensile stress. At present, the research on the design and analysis of prestressed concrete-steel composite wind power tower connection section is very limited, so this paper carries on the numerical analysis and the experimental research work to the composite wind power tower connection section. It can provide reference for the design and research of combined wind power tower in China. The main work of this paper is as follows: (1) the selection design of the connection section of the combined wind power tower is put forward, and through the comparative analysis of the four connection section schemes, it is concluded that the steel box concrete connection section has remarkable advantages. By simplifying the mechanical model, the stress characteristics of the steel box concrete connection section are calculated and analyzed. (2) the finite element analysis software ABAQUS, is used to model the scheme of the steel box concrete connection section and the traditional thick flange connection section. The elastic and elastic-plastic analysis are carried out respectively, and the calculation results of the two connection schemes are compared, and the advantages of the steel box concrete connection section in the mechanical performance are obtained. (3) the 2MW wind power tower is taken as the research object. The scale model of local joint in concrete connection section of steel box is designed, and the static loading test is carried out by hydraulic actuator. By analyzing the mechanical behavior of the test members, the rationality of the design of the steel box concrete connection section is obtained. (4) on the basis of the experimental research of the steel box concrete connection section, the finite element modeling analysis of the test model is carried out. The accuracy of the experimental study is verified by comparing the numerical calculation with the experimental results.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9

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