预应力混凝土—钢组合风电塔架钢箱混凝土连接段性能研究
发布时间：2019-05-12 18:13
【摘要】：风能是一种蕴藏丰富,分布广泛,清洁的可再生资源。目前,国内已建成的风电塔架多采用钢塔形式。随着大型兆瓦级风力发电机组的发展,塔架的高度不断变高,截面尺寸不断变大,这就增加了塔段的制作和运输难度。混凝土塔架可以解决制作和运输上的难题,但是由于其自重较大,单一的混凝土塔架不能满足风电塔架日益增长的高度要求。基于以上原因,将混凝土塔架和钢塔架组合,充分发挥两种材料的优势,设计一种预应力混凝土—钢组合风电塔架,为大型风力发电机组的发展提供一种新途径。在进行组合风力发电塔架结构设计中,预应力混凝土塔段与钢塔段的连接是该结构的关键部分。本文提出一种新型的连接段方案—钢箱混凝土连接段,它可以提高连接段整体刚度,改善连接段钢箱下部混凝土受力性能,使其应力分布更加均匀,避免出现拉应力。由于目前对预应力混凝土—钢组合风电塔架连接段的设计与分析研究非常有限,因此本文通过对组合风电塔架连接段开展数值分析以及试验研究工作,可以为我国组合风电塔架的设计与研究提供参考。本文主要开展以下工作:(1)提出组合风电塔架连接段的选型设计,并通过对四种连接段方案的对比分析,得出钢箱混凝土连接段具有显著的优势。通过简化力学模型,计算分析钢箱混凝土连接段的受力特点。(2)利用有限元分析软件ABAQUS,对钢箱混凝土连接段与传统厚型法兰盘连接段方案整体建模,并分别进行弹性和弹塑性分析,对比两种连接方案计算结果,得出钢箱混凝土连接段在受力性能上的优越性。(3)以2MW风力发电塔架为研究对象,设计钢箱混凝土连接段局部节点缩尺模型,利用液压作动器对其进行静力加载试验。通过分析试验构件的力学行为,得出钢箱混凝土连接段设计的合理性。(4)在钢箱混凝土连接段试验研究的基础上,对试验模型进行有限元建模分析,通过对比数值计算与试验结果,验证试验研究的准确性。
[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.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9
[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.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9
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