Study On Safety Assessment Of Masonry Structures In Loess Area After Flood

Masonry structure is widely distributed in the loess area of China,but because of its special geological environment characteristics and structural form,the structures of buildings are often damaged seriously after flood,which brings great harm to people’s production,life and safety.In order to eliminate the potential safety hazard,it is particularly urgent to adopt a reasonable and efficient way to detect and evaluate masonry structures.At present,the detection and evaluation of masonry structures safety in this area are still indiscriminately included in the scope of conventional civil buildings,without considering the special disaster-causing mechanism and destructive characteristics of "flood",which has brought adverse effects on disaster relief work in disaster-stricken areas.Therefore,by means of rapid detection of masonry structures safety,based on extracting the main influencing factors of masonry structure safety after flood,through innovating and improving the structural safety assessment method,this paper carries out the research on masonry structure safety assessment in loess area after flood.The main contents are as follows:(1)Research on safety assessment theory.Through the research on the performance degradation of masonry structure after flood,the process of structural detection and the method of safety evaluation,the paper summarizes many shortcomings in the process of detection and evaluation of masonry structure after flood: neglecting the disaster-causing characteristics of flood,unclear classification of evaluation criteria,and neglecting the integrity of structure.(2)Research on the content of safety assessment of masonry structure.Firstly,the existing evaluation contents are summarized and summarized.On this basis,combined with their own practice and relevant research queries,the content of safety evaluation of masonry structure is improved.The two construct the index system of structural safetyevaluation.The weights of each index are determined by combining subjective and objective weighting methods.(3)Research on structural safety assessment model.By analyzing the advantages and disadvantages of each evaluation method,the grey fixed weight clustering method is selected as the evaluation method in this paper.The criteria of structural safety evaluation index are developed in sequence according to three levels of component,sub-unit and evaluation unit.Then,the whitening weight functions of grey classes of each index are constructed from quantitative and qualitative perspectives,and the evaluation matrices of each index are constructed.Finally,the structural safety evaluation results of each level are obtained according to the grey clustering evaluation matrix.(4)Case study.By analyzing the general situation of the project and calculating the inspection data,the safety of the selected masonry structure after flood is evaluated comprehensively by using the model based on grey fixed weight clustering evaluation method.Through the analysis of the evaluation results obtained by the grey fixed weight clustering evaluation method and the comparison with the original evaluation results,the applicability of the structural model is finally verified.