输电线路大跨越钢管塔法兰盘连接试验及研究

钢管法兰连接节点的设计研究是大跨越高塔设计的重要组成部分。对于某些重大的跨越高塔,由于荷载的大幅增加,法兰节点按常规计算方法得到的承载能力不够精确,使得设计人员难以准确把握实际结构的受力状态,设计的风险较大,而法兰节点的准确合理设计是保证结构安全的重要环节。以舟山与大陆联网工程中的370m大跨越塔为背景,对内侧螺栓连接法兰和外侧螺栓连接法兰进行节点极限承载力拉伸试验,并建立精确的有限元分析模型,研究法兰节点的力学行为、应力分布以及弹塑性的破坏过程,证明内法兰与外法兰都具有很高的安全裕度,可以作为大跨越钢管塔的法兰节点设计的一种参考。

TEST AND NONLINEAR ANALYSIS OF FLANGE CONNECTING JOINT FOR LONG-SPAN TRANSMISSION STEEL TOWER

The design of flange connecting joint is an important part of the long span transmission lines.For some major long-span towers,due to a substantial increase in load,the bearing capacity of flange joints by conventional method is to be imprecise.It＇s difficult to accurately grasp the actual structure state and the design risk increases.Yet,the flange design to ensure the structural safety is the main design components.Based on the engineering of a large long-span steel tower with 370 m height for Zhoushan and the mainland networking projects,the accurate finite element model of two typical flange joints has been established.The mechanical behavior,stress distribution and the process of elastic-plastic damage have been studied and compared respectively.Through the research,some useful conclusions have been found,and the results can be applied for the design of flange connecting joints for large long-span transmission towers.