Study Of Reliability Appraisal And Classification And Strengthening Of Single-floor Industrial Mill Buildings

According to the national statistics concerned, the factory area of industrial buildings has added up to 700 million square metre by the end of 1994,among which the number of the buildings served for beyond 20 years has been more than half. Many buildings' service life has come into old age. Companied with aging and disrepairing of structural members,and suffering high temperarure,high moisture,acidic or alkaline gas from outside, the reliability and safety of industrial mill buildings have depressed severely.On the basis of the theory of fuzzy math and analytic hierarchy process, this paper establishes a math model of three-grade comprehensive evaluation method for the reliability assessments of single-floor industrial buildings,and advances a new method for those existing structures'quality classification. The characteristics of this method includes establishment of the evaluation sets of the membership functions for single-factor,determination of the weight value sets of each factor by analytic hierarchy process,usage of the weighted average model as a comprehensive evaluation model.and industrial buildings'quality classification through maximum membership degree method or approach degree method. Otherwise,this paper discusses the theory and technique of industrial buildings' strengthening .Through an example of a one-floor RC factory building, this paper evaluates and classifies its reliability by criterion method and fuzzy comprehensive evaluation method. By comparing two results, this paper testifies the latter's feasibility, and analyses each merits and defects. At the same time, this paper proposes strengthening measures about the existing quality problems of the building.