振动时效技术在自升式风电安装平台固桩架上的应用

振动时效技术是一种有效消除焊接残余应力、提升构件使用寿命、保证结构尺寸精度的方法。在自升式平台固桩架建造过程中，焊接施工导致其内部产生大量的残余应力，残余应力是导致固桩架精度超差和损伤失效的重要原因之一，它会大幅度降低平台的疲劳寿命，因此，固桩架建造完成后消除其内部残余应力对于平台的使用安全至关重要。本文以一个质量约100 t的固桩架分段为研究对象，采用专门的振动时效设备对固桩架施加激振力，测量振动时效前后主焊缝附近的残余应力水平。通过对比分析发现，振动时效技术可以有效降低固桩架焊接过程中产生的残余应力，达到调整、均化、降低残余应力水平、提高构件尺寸精度稳定性的效果，有利于提升平台的使用寿命。

Application of Vibratory Stress Relief Technology on Pile Fixing Frame of Jack-up Wind Power Installation Platform

Vibration stress relief technology is an effective method to eliminate welding residual stress, improve the service life of components and ensure structural stability. During the construction of jack-up platform pile fixing frame, welding construction causes a large amount of residual stress in the pile fixing frame. Residual stress is one of the important reasons for the size change, loss and failure of the pile fixing frame. It will greatly reduce the fatigue life of the platform. Therefore, it is very important for the safety of the platform to eliminate the internal residual stress after the construction of the pile fixing frame. In this paper, a 100 t section of the pile fixing frame is taken as the research object, and a special vibratory stress relief device is used to apply exciting force to the pile fixing frame. The residualstress level near the main weld before and after the vibratory stress relief is measured. Through comparative analysis, it is found that the vibratory stress relief technology can effectively reduce the residual stress generated during the welding process of the pile fixing frame, achieve the effect of adjusting, homogenizing, and reducing the level of residual stress, ensure the overall stability of the structure, and help improve the service life of the platform.