## 4 Comparison of Evaluation Results  
Table 6 shows some of the fire-damaged RC members presented in \"Diagnosis and Repair Methods of Fire Damaged Buildings\" published by the AIJ [2; 19], which were obtained from the actual onsite investigation on a fire-damaged RC structure in Japan. The field inspection data of the fire-damaged RC members are also summarized in Table 6, where those are classified into two categories, i.e., CPD I and CPD II. The average compressive strength of the concrete cores taken from the columns, beams and walls in the fire-damaged area ranged from 25.1 MPa to 36.7 MPa, and those in the non-damaged area ranged from 31.9 MPa to 35.5 MPa. The measured concrete carbonation depths in the fire-damaged region ranged from 10.9 mm to 26.5 mm, and those in the non-damaged region ranged from 2.7 mm to 3.8 mm. In addition, the heating temperature was estimated at around 300 \({}^{\circ}\)C on average in the fire damaged region. In particular, the heating temperature was estimated at about 410 \({}^{\circ}\)C on the surface of Beam 2 (Case 4), which means that it was exposed to a higher temperature compared to  
Figure 10: Fuzzy inference process for CPD II. other members, and the carbonation depth was measured at 10.9 mm. In addition, the carbonation depth of Wall 1 (Case 2) was measured at 26.5 mm, which was the largest among those of all members. Table 7 shows a comparison of the evaluation results estimated by professionals and those by the FDDS proposed in this study. The column (Case 1) shown in Table 6 was discolored to pink, and soot was also observed on the member surface, together with a 7 mm-depth spalling. In 'Diagnosis and Repair Methods of Fire Damaged Buildings' published by AIJ [2; 19], Grade B was imposed on the fire-damaged column (Case 1), based on the field inspection data. The fire damage grade assessed by the FDDS was Grade B in both CPD I and CPD II evaluations, which is identical to that reported in the AIJ document. In addition, as shown in Table 7, the FDDS evaluation results for Cases 2-5 were also the same or very close to those estimated by the fire inspection professionals based on the AIJ methods. Therefore, it is considered that the FDDS proposed in this study can provide reasonable fire damage grades. It should be emphasized that the FDDS can provide consistent and objective evaluation results because it can ensure comprehensive considerations of the influential factors (i.e., the field inspection data) in a systematic manner based on fuzzy theory. As the FDDS provides very similar fire damage grades to the inspection method widely used in current practices, it can be now straightly adopted for the field inspection. In addition, since the application of the FDDS can improve the reliability of the fire damage grades of RC members, it can be also very useful to establish appropriate post-fire actions, such as repairing or strengthening of the fire-damaged RC members. The fire damage diagnosis system proposed in this study, however, can provide the fire damage grades of individual RC members, but it cannot give the overall fire damage grade of an RC structure at the structural level. Thus, additional research is yet necessary to extend its application to a building-level grade evaluation.