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UNK RUS 7-17 Tur Victar Brest State Technical University, 267, Moskovskaya St., Brest, Belarus, 224017 Yalavaya Yuliya Fuzzy logic – based expert system for assessment of existing concrete structures Fuzzy logic is a useful tool when assessing the existing reinforced concrete structures. The introduction of expert system in assessing the technical condition of the existing structures built on the fuzzy logic represents a transition to a new and higher-quality level for the survey of constructions sites. The paper presents the principle of development and implementation of expert system for assessment of the damages of the existing structures. The process is based on the algorithm in which the input data (crack width and propagation, residual strength of materials, amount and condition of the steel reinforcement, deflection, corrosion level et al.) and information collected at each phase are processed and interpreted in order to define the successive step of the procedure. As a result, it is seen that the assessment of the existing building with precast concrete elements with usage of the proposed fuzzy system is in compliance with the estimation of the qualified experts. 10.18720/CUBS.81.1 69 Expert system; fuzzy logic; existing structures; assessment; technical condition; https://unistroy.spbstu.ru/article/2019.81.1/ 86_1.pdf

UNK RUS 18-27 Chernyshev Dmitry Operation of horizontal ground heat exchanger in climatic conditions of the Krasnodar region Modes of operation of horizontal ground heat exchanger of heat pump in Krasnodar region of Russia are investigated in this work. Ground temperature decreases from 3,6 °С to -1,6 °С in the area of the heat exchanger during the heating period due to increase of the heat removal of the heat exchanger from 25 W/m to 95 W/m, in this connection the coefficient of performance respectively decreases from 2,49 to 1,98. According to the results of mathematical modeling the temperature of the ground in the case of minimum heat removal reaches a temperature of undisturbed ground, the temperature of the ground in the case of maximum heat removal is reduced by 1 °C compared to the temperature of undisturbed ground. 10.18720/CUBS.81.2 69 heat pump; horizontal ground heat exchanger; coefficient of performance; heat-collector systems; temperature distribution; https://unistroy.spbstu.ru/article/2019.81.2/ 86_2.pdf