钢—混凝土组合结构风电塔架力学性能研究

发布时间：2018-06-23 19:42

本文选题：钢-混凝土组合结构风电塔架 + 结构设计　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：随着人们对风能的逐步重视,风力发电得到迅速发展。因此,风机单机容量提高迅速,势必导致传统钢塔架的高度、壁厚和直径的大幅度增大,给塔架的制造、安装和运输带来困难,成本也急剧增加。而中空夹层钢管混凝土具有传统实心钢管混凝土的良好受力性能之外,还具备抗弯刚度大、自重轻以及经济效益高的优点。为了降低大容量风电塔架的建设成本,新型风电塔架的结构形式得到人们的重视和研究。本文结合风电塔架研究现状和中空夹层钢管混凝土结构优势,提出基于中空夹层钢管混凝土的新型钢-混凝土组合结构风电塔架,并结构设计。通过试验和数值模拟研究,得到钢-混凝土组合结构工作机理以及合理的结构设计方案。本文在中空夹层钢管混凝土结构的基础上设计了5类适用于风电塔架的钢-混凝土组合结构,5类结构的区别在于内、外钢管与夹层混凝土接触面上的肋板布置方式不同。通过轴压试验,探讨各类试件内、外钢管变形情况和破坏形式、轴向荷载与应变关系以及肋板的不同布置方式对试件承载力的影响。从试验结果来看,内、外钢管焊接通长肋板对试件变形、受压刚度和承载力均有明显的改善和提高。本文使用ABAQUS有限元软件对5类试件进行轴压试验的数值模拟分析。对比计算结果和试验结果,验证有限元模型的有效性。通过有限元计算结果在受压刚度、延性特征以及内、外钢管工作机理方面对5类试件受力全过程进行对比研究。同时,通过试件在受力过程中特征点的应力分布云图分析试验过程中各类试件变形情况和破坏形式的原因,验证了通长肋板可以缓解或避免钢管过早进入屈服阶段,防止了试件因钢管局部屈曲发生破坏。最后,结合试件承载力、受压刚度和延性特征对5类试件进行综合性能的对比分析。通长肋板相比分层肋板更适用于钢-混凝土组合结构风电塔架,得出了一些可供实际工程设计参考的结论。合理的结构形式还需结合制造成本、安装和运输方面进一步优化。
[Abstract]:With the gradual attention to wind energy, wind power generation has been developed rapidly. Therefore, the rapid increase of fan capacity will inevitably lead to a large increase in the height, wall thickness and diameter of the traditional steel tower, which will make it difficult to manufacture, install and transport the tower, and the cost will increase sharply. The hollow sandwich concrete-filled steel tube has the advantages of high flexural stiffness, light weight and high economic benefit in addition to the good mechanical performance of the traditional solid concrete filled steel tube. In order to reduce the construction cost of large capacity wind power tower, the structure form of new wind power tower has been paid attention to and studied. Based on the research status of wind power tower and the advantages of hollow sandwich concrete filled steel tube structure, a new type of steel and concrete composite structure wind power tower based on hollow sandwich steel tube concrete is proposed in this paper, and the structure is designed. Through experiment and numerical simulation, the working mechanism and reasonable design scheme of steel-concrete composite structure are obtained. On the basis of hollow sandwich concrete filled steel tube structure, five kinds of steel-concrete composite structures suitable for wind power tower are designed in this paper. The difference lies in the different arrangement of ribbed slab on the interface between outer steel tube and sandwich concrete. Through axial compression test, the deformation and failure mode of steel tube inside and outside the specimens, the relationship between axial load and strain, and the influence of different arrangement of ribbed plate on the bearing capacity of specimens are discussed. According to the test results, the deformation, compression stiffness and bearing capacity of welded long ribbed plates of inner and outer steel tubes are obviously improved and improved. In this paper, Abaqus finite element software is used to simulate the axial compression test of 5 kinds of specimens. The validity of the finite element model is verified by comparing the calculated results with the experimental results. Through the finite element calculation results in the compression stiffness ductility characteristics and internal and external steel pipe working mechanism of the whole process of five types of specimens are compared. At the same time, through the analysis of the stress distribution of the characteristic point in the stress process of the specimen, the reasons of the deformation and failure form of all kinds of specimens during the test process are analyzed, it is proved that the long ribbed plate can alleviate or avoid the steel pipe entering the yield stage prematurely. The local buckling failure of the steel tube is prevented. Finally, combined with the bearing capacity, compression stiffness and ductility of the specimens, the comprehensive properties of the five types of specimens are compared and analyzed. Compared with layered ribbed slab, long ribbed slab is more suitable for wind power tower of steel-concrete composite structure, and some conclusions for practical engineering design are obtained. Reasonable structure should be optimized in combination with manufacturing cost, installation and transportation.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

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