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

多年来，热校直一直被用于修复受损的钢结构。然而，直到最近，从业者使用的方法是基于经验，通过试验和错误。 最近的研究提供了一个工程基础的方法，并建立了程序，它的使用。工程和建筑界一直犹豫不决，利用热矫直的几个原因，包括：过去的误用过程中产生的骨折修复;关注的影响，热矫直对材料性能，特别是延展性;和普遍缺乏了解的方法。其目前的应用主要是在修复损坏的桥梁与其他类型的建筑有限的应用. 即使现在存在的科学依据的方法，有一个主要的差距，在现有的数据，限制了热矫直的应用。目前还没有对热矫直构件的断裂敏感性进行有意义的研究。没有这方面的知识，基于性能的设计方法就不能用于设计热矫直修复。 本建议的目的是描述一个研究计划，将量化的过程，并定义一个成功的修复thelimiting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.