The interlayer structure of prefabricated buildings typically consists of a large number of connectors,suspension systems,and weld points.Generally,vulnerabilities are often located at these connection points.In low-temperature environments,due to the complexity of the structure,it is difficult to detect some vulnerabilities directly.Therefore,a simulation for detecting vulnerabilities in the interlayer structure of prefabricated buildings in low-tem-perature environments was proposed.In the first step,the method of infrared thermography was used to obtain the thermal insulation structure of exterior walls,and then the heat conduction process of the building was analyzed.Sec-ond,the accumulation of heat at vulnerable points in the outer interlayer structure was researched,and then the infra-red boundary value conditions were obtained by using the heat conduction differential equation,thereby clarifying the heat conduction and time variables of the interlayer structure.Third,the thermal resistance of the inner and outer walls was calculated,and then the location of defects in the outer interlayer structure could be determined.Fourth,an evaluation framework for vulnerable points in the interlayer structure was constructed to integrate the value of vulnera-bility assessment.Through self-evaluation of decision-making units,the optimal solution was obtained from the results of linear programming.Finally,the detection results of vulnerabilities in the internal interlayer structure were obtained based on the cross-evaluation value.Experiment results prove that the proposed method can effectively detect vulnerabilities in the inner and outer interlayer structures of prefabricated buildings.This method also has good robustness and practicality.
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