变电站构架多支管空间节点力学性能研究

发布时间：2018-11-28 07:32

【摘要】：在变电站及其他钢结构设计中,钢节点起到连接各杆件,保证结构充分发挥其功能的重要作用,是设计者工作中的重中之重。钢管相贯节点在实际工程中应用较早,范围较广,其力学性能已得到相对充分的研究,已得出相应的力学理论公式可供设计者参考。插板节点因其安装施工便捷、制作工艺简单、运输方便等优势,近些年逐渐被广泛应用于工程中。有关其力学性能的研究较少,国内外有关规范尚有欠缺。因此,同时具有相贯节点和插板节点特征的钢管节点在工程应用和理论分析中具有很重要的研究意义。本文以220kV风帆式联合构架变电站工程为背景,对构架中的空间节点足尺模型进行了静力加载试验和非线性有限元分析。文中所研究的多支管空间节点同时具有相贯节点和插板节点的特征。在足尺模型试验中,详细介绍了加载方案、布片方案、测试方案,并对试验数据进行了分析;针对5种荷载工况,研究了节点在1.5倍各工况设计荷载下的力学性能,了解了节点在各加载阶段的应力分布及发展情况,分别得出5种工况下各测点的应力发展曲线;由试验可知,加载结束时,节点各测点应力均未超过材料的屈服强度,节点并无明显变形。在试验的基础上,同时考虑了材料非线性和几何非线性,建立了节点有限元模型,严格按照试验加载制度,对节点进行了有限元分析。分别针对5种工况,得出各测点应力发展的数值模拟解、荷载-位移曲线、破坏形式及极限承载力。结果表明,试验结果和有限元结果吻合良好,节点在各工况下的极限承载力较大。节点设计安全合理,从而保证了变电站工程的安全性。
[Abstract]:In the design of substation and other steel structures, the steel joint plays an important role in connecting the members and ensuring the structure to give full play to its function, which is the most important task in the designer's work. The intersected steel pipe joints have been used in practical engineering earlier and have a wide range. The mechanical properties of the joints have been studied sufficiently and the corresponding mechanical theoretical formulas can be used for reference by designers. Because of the advantages of convenient installation and construction, simple manufacturing technology and convenient transportation, the splint joint has been widely used in engineering in recent years. There are few researches on its mechanical properties, and the relevant codes at home and abroad are still lacking. Therefore, the steel pipe joints with the characteristics of intersecting joints and plate joints are of great significance in engineering application and theoretical analysis. In this paper, the static loading test and nonlinear finite element analysis of the full-scale model of the spatial node in the frame are carried out under the background of the 220kV windsurfing combined frame substation project. In this paper, the multi-branch tubular space node has the characteristics of the intersecting node and the interlocking joint. In the full-scale model test, the loading scheme, the cloth scheme and the test scheme are introduced in detail, and the test data are analyzed. According to five load conditions, the mechanical properties of the joints under 1.5 times design load are studied, and the stress distribution and development of the joints at each loading stage are understood, and the stress development curves of each measuring point under five conditions are obtained respectively. The test results show that at the end of loading, the stress at each measuring point of the joint does not exceed the yield strength of the material, and there is no obvious deformation of the joint. On the basis of the experiment, considering the material nonlinearity and the geometric nonlinearity, the finite element model of the joint is established, and the finite element analysis of the joint is carried out strictly according to the test loading system. The numerical simulation solution, load-displacement curve, failure form and ultimate bearing capacity of each measuring point are obtained according to five working conditions. The results show that the test results are in good agreement with the finite element results, and the ultimate bearing capacity of the joints under various conditions is larger. The node design is safe and reasonable, thus ensuring the safety of substation engineering.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63

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