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

多年来，热矫直一直被用于修复损坏的钢结构。然而，直到最近，从业者使用该方法是基于通过试验和错误获得的经验。近年来的研究为该方法提供了工程依据，并建立了使用规程。工程和建筑界一直对使用热矫直犹豫不决，原因包括：过去在修复过程中使用不当导致骨折；关注热矫直对材料性能，特别是延展性的影响；并且普遍缺乏对方法的理解。它目前的应用主要是修复损坏的桥梁梁，在其他类型的建筑中应用有限。尽管这种方法现在有了科学依据，但现有数据中存在一个主要缺口，限制了热矫直的应用。对于热矫直构件的断裂敏感性，目前还没有重要的研究。没有这些知识，基于性能的设计方法不能用于设计热矫直修复。本提案的目的是描述一个研究计划，该计划将量化过程并定义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.