Abstract
An effective evaluation model for safety appraisal of existing concrete members plays a significant role in promoting the management of an existing building. This study aims to introduce extension theory into the safety appraisal of existing concrete members based on five indices (bearing capacity, deflection-to-span ratio, cracks, reinforcement corrosion, and concrete carbonation depth) and inspection data. A matter-element model is established for the safety appraisal of existing concrete members based on matter-element theory. The safety appraisal rating is identified by the comprehensive correlation degrees, which can be calculated by the weights and single-index correlation degrees of the five indices. Owing to the one-sidedness in the single-weighting method, a comprehensive weighting method integrating the merits of subjective weight and objective weight is adopted based on game theory. The interval analytic hierarchy process (IAHP) and entropy weight method are, respectively, used to determine the subjective and objective weight of each index. It was found that the subjective weight vector calculated by IAHP consists of interval numbers. Therefore, the traditional comprehensive weighting method based on game theory needs to be improved by the interval number theory. A comparison analysis between the results generated by the proposed model and an analytic hierarchy process-fuzzy comprehensive evaluation model is conducted. The results show that the matter-element extension model based on comprehensive weight is more accurate and rational. The proposed model makes full use of inspection data and gives a clear safety level to decision makers avoiding disorganized data of a single index. Hence, it can serve as guidance for safety appraisal of existing concrete members in the future. Furthermore, the improved comprehensive weighting method has practical merits and high scientific value in terms of safety evaluation and other applications in different research fields.
Highlights
An effective evaluation model for safety appraisal of existing concrete members plays a significant role in promoting the management of an existing building. is study aims to introduce extension theory into the safety appraisal of existing concrete members based on five indices and inspection data
A matter-element model is established for the safety appraisal of existing concrete members based on matter-element theory. e safety appraisal rating is identified by the comprehensive correlation degrees, which can be calculated by the weights and single-index correlation degrees of the five indices
Owing to the one-sidedness in the singleweighting method, a comprehensive weighting method integrating the merits of subjective weight and objective weight is adopted based on game theory. e interval analytic hierarchy process (IAHP) and entropy weight method are, respectively, used to determine the subjective and objective weight of each index
Summary
An effective evaluation model for safety appraisal of existing concrete members plays a significant role in promoting the management of an existing building. is study aims to introduce extension theory into the safety appraisal of existing concrete members based on five indices (bearing capacity, deflection-to-span ratio, cracks, reinforcement corrosion, and concrete carbonation depth) and inspection data. Is study aims to introduce extension theory into the safety appraisal of existing concrete members based on five indices (bearing capacity, deflection-to-span ratio, cracks, reinforcement corrosion, and concrete carbonation depth) and inspection data. Since the objects of this study are reinforced concrete members, their safety can be evaluated by bearing capacity appraisal individually according to design specifications. In order to solve this problem, this study introduces the matter-element extension model into the safety appraisal of existing concrete members. Due to their significant impact on the safety of existing concrete members, two additional indices are considered in the proposed rating model: reinforcement corrosion and concrete carbonation depth [15,16,17]. An improved comprehensive weighting method based on game theory and interval number theory which can process interval numbers is used to determine the indices’ comprehensive weights
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