Collaborative Research: Fracture Properties of Heat-straightened Steel (UWYO)

多年来，热矫直一直被用于修复受损的钢结构。然而，直到最近，实践者使用这种方法都是基于通过试验和错误获得的经验。最近的研究已经为该方法提供了工程基础和既定的使用程序。工程和建筑界对使用热矫直一直犹豫不决，原因包括：过去对修复过程中产生断裂的工艺的误用；对热矫直对材料性能的影响，特别是对塑性的影响；以及对该方法普遍缺乏了解。它目前的应用主要是修复受损的桥梁梁，对其他类型的建筑应用有限。尽管这种方法现在已经有了科学依据，但现有数据存在着一个重大空白，限制了热矫直的应用。对于热矫直构件的断裂敏感性还没有重要的研究，如果没有这些知识，基于性能的设计方法就不能用于设计热矫直修复。这项建议的目的是描述一项研究计划，该计划将量化修复过程并确定成功修复的限制参数。

Heat straightening has been used to repair damaged steel structures for manyyears. However, until recently practitioners use of the method was based onexperience gained through trial and error. Recent research had provided andengineering basis for the method and established procedures for its use.The engineering and construction community has been hesitant to utilize heatstraightening for several reasons including: past misuse of the processwhich has produced fractures during repair; concerns about the effect ofheat straightening on material properties, especially ductility; and ageneral lack of understanding of the method. Its current application isprimarily in repair of damaged bridge girders with limited application forother types of construction. Even though a scientific basis now exists forthe method, there is a major gap in available data that has limited theapplication of heat straightening. There have been no significantinvestigations into the fracture sensitivity of heat straightened members.Without this knowledge, a performance based design approach cannot be usedfor designing heat-straightening repairs. The purpose of this proposal isto describe a research plan that will quantify the process and define thelimiting parameters for a successful repair.