Hierarchy Modeling of Damage Factors Due to Alkali-Aggregate Reaction and Chloride Corrosion and Its Application to Damage Assessment

由于在役结构的损伤过程多，损伤因素多，因此对碱-集料反应和氯离子腐蚀引起的混凝土结构劣化的评估以及骨料和钢筋的潜在反应能力的评估需要考虑多方面的因素。本文将模糊层次结构模型和模糊集理论相结合，开发了一个基于模糊层次结构模型和模糊集理论的损伤评估系统，作为碱-集料反应特别是碱-硅酸反应的计算机辅助评估系统。评估系统使用的计算机系统和语言分别是日本NEC公司的PC-9801VX41个人计算机和N88 BASIC语言。该系统产生的最后阶段的损失评估结果被认为具有语言表达形式表示的“安全”、“轻微安全”、“中等”、“轻微危险”和“危险”五种元素归因的可能性期望值。通过对收集到的现场数据的几个具体结构的分析，说明了该系统的适用性。通过对损伤结构的应用，用该系统进行推理，得到了合理的结果。

Assessment of deteriorating concrete structures due to alkali-aggregate reaction and chloride corrosion and also estimation of potential reactivity of aggregate and reinforcing bar are necessary to be taken many factors into consideration because there are multiple processes of damage with a lot of damage factors in existing structures in service. Then, in the processes of the damage assessment are included a subjective uncertainty of professional engineers such as professional experience, knowledge on damage assessment, etc.In this paper, a damage assessment system as a computer-aided assessment system for alkali-aggregate reaction, especially for Alkali-Silica Reaction (ASR) is developed based on a combination of both the fuzzy hierarchy structural model and the fuzzy set theory which deal with the subjective information related to the assessment. The computer system and language which used in the assessment system are the PC-9801VX41 personal computer made by the NEC Corporation, Japan and the N88 Basic language, respectively.The results of the damage assessment at final stage produced by this system are considered to be presented with the possibilities expected values of attribution to five elements expressed by linguistic expressions as "safe", "slightly safe", "moderate", "slightly danger" and "danger".A few concrete structures on which field data have been collected are analyzed to demonstrate the applicability of this system. Through the application to the damaged structures, reasonable results are obtained by inference with the system.