Reliability of Existing Framed Structures Using Approximate Reasoning

最近在医学、经济学和工程学方面的研究表明，模糊集合理论确实可能是表达专业判断的有用工具。结构工程的研究主要集中在疲劳和地震荷载下的损伤评估。本研究将着重于现有（包括新建）平面框架结构的可靠性和安全性。经典可靠度分析将首先使用客观信息，如材料的屈服强度、结构的几何形状和施加的载荷来计算结构的可靠度度量。然后利用模糊集逻辑更新可靠性度量，以通过检查包括连接和结构成员的质量。与结构整体安全性相关的其他参数也将进行研究。提出了一种客观可靠度的更新算法。将讨论在可靠性分析中纳入主观信息的意义。这项研究的结果有望为结构的安全性提供更精确的评估。预计这些结果将提高工程师或业主在决定对结构采取适当行动（如维护和修复等）时的决策过程。

Recent studies in medicine, economics and engineering have demonstrated that fuzzy set theory may indeed by a useful tool for the expression of professional judgement. Studies in structural engineering have been on damage assessment due to fatigue, and seismic loads. This research will emphasize the reliability and safety of existing (including newly constructed) plane frame structures. Classical reliability analysis will be used first to calculate the structure's reliability measure using objective information such as yield strength of materials, geometry of structures and applied loads. The reliability measure will then be updated utilizing the fuzzy set logic to include the quality of connections and structural members through inspections. Other parameters pertinent to the overall safety of a structure will also be investigated. An algorithm for updating the objective reliability will be presented. The significance of incorporating the subjective information in reliability analyses will be discussed. The results of this proposed study are expected to provide a more precise assessment on the safety of structures. These results are expected to enhance the engineers or owners' decision-making process in determining appropriate action to the structure such as maintenance, and rehabilitation, etc.