Research On The Construction Risk Recognition And Evaluation Model Of Brick Masonry In Ancient Pagoda

Ancient masonry pagoda is an ancient high-rise building in our country and to protect it is significantly important.Ancient masonry pagoda has been affecting by the natural and human activities for a long time after completing construction,and usually the damage is more serious.Therefore,it is an effective way to protect Ancient pagoda by reinforcing.In order to ensure the rationality and scientific of reinforce construction.Through carrying on the system analysis the characteristics of the Ancient pagoda building and the reinforcement construction,then built index system of influence factors about the construction risk in brick Ancient pagoda reinforcement,and analyzed by factor analysis method,at last obtain the weight vector and proposed for appropriate model of risk assessment method.The main work is as follows:on the base of looking up data,the three aspects of masonry Ancient pagoda risk analysis methods are introduced briefly: the qualitative risk analysis,quantitative risk analysis method and qualitative and quantitative risk analysis method.Through comparative analysis the advantages and disadvantages of various risk methods,combined with the existing data,experience and research methods,select the fuzzy comprehensive evaluation method as reinforcement construction of risk assessment methods in Ancient masonry pagoda.According to the characteristics of ancient masonry pagoda structure and damage,combined with the characteristic of strengthening construction project,reference to the relevant literature,and expert advice,from Ancient pagoda's own risk,construction risk,management risk,economic risk,contract risk,legal risk and political risk,personnel risk,seven system factors to established and system analysis reinforcement construction risk index system in ancient masonry pagoda.The factor analysis method is used to analyze the index system,and the weight of each index is calculated by the factor contribution rate.Then the weight vector of the system layer and the factor layer is determined,which reflects the importance of the system.Based on the existing reference assessment documents,the risk factors were divided into A,B,C,D four grades,respectively,giving the evaluation standard and choosing the appropriate membership function,to determine the degree of membership by analogy,established a fuzzy comprehensive evaluation system.In Shanxi Province,Xingping North Tower repair project as an example,through the factor analysis method to determine the weights,using fuzzy comprehensive evaluation to evaluate.The evaluation results show that the reinforcement project risk rating is I level and consistent with the actual construction process.At the same time show that based on fuzzy comprehensive evaluation method to establish the risk assessment model for Ancient pagoda masonry reinforcement construction is ideal,verify the feasibility of evaluation model.