Quality degradation evaluation of brick-timber structure houses built before 1950 in Shanghai

The quality degradation of historical brick-timber structure houses in Shanghai is affected by various factors, like worsen environment, improper maintenance, and lack of repair. The inspection results of common problems involve a large amount of data. To quantitatively evaluate the quality degradation of historical brick-timber structure houses in Shanghai, this paper introduces principal component analysis method and complex correlation coefficient weighting method. First, material strength and component damage were selected as the evaluation indicators of housing quality degradation. Then the principal component analysis method and complex correlation coefficient weighting method were utilized to analyze the data of evaluation indicators. In this way, the final evaluation results could be obtained. The evaluation results of an example show that the evaluation values of the principal component analysis method and complex correlation coefficient weighting method were relatively similar, and well consistent with the actual safety elevation results of appraisal reports.