Research On Safety Evaluation Method Of Masonry-timber Buildings

As a cultural and artistic treasure of our country,ancient architecture has high historical and scientific value.As one of the representatives of ancient buildings,brick-wood ancient buildings,have gradually attracted people’s attention.At the same time,people have also paid attention to their maintenance and repair work.Only by evaluating the safety of ancient brick and wood structures scientifically and reasonably can we provide a reliable basis.So far there is little research on the overall safety of brick-wood structure ancient buildings,and it is different from modern buildings,so the evaluation method of modern architecture can not be used to assess its safety directly.How to evaluate its safety scientifically and reasonably is an urgent problem to be solved.By summarizing the current research status of the safety of existing buildings and ancient architectures,this paper analyzes the structural system and safety influencing factors,and summarizes the basic evaluation theory of the safety of masonry-timber buildings;Combing with Standards and specifications and analysis of existing building safety research methods,selection of methods based on the combination of structural state assessment and structural performance-based analysis to study the safety of ancient brick-wood structures.According to the basic theory of the safety research of brick-wood structure ancient buildings,combined with its construction characteristics,systematically analyze the content of safety evaluation,construct a safety evaluation system of masonry-timber buildings with three parts and three levels,which includs foundation,upper load-bearing structure,brick wall and roof enclosure structure.On this basis,analyzing the advantages and disadvantages of various index weight determination methods,combined with the characteristics of the established evaluation system,the subjective weight of the evaluation index is determined by the analytic hierarchy process,the objective weight is determined by a simple correlation function,and the game model is established to determine its synthesis Weights.Considering the characteristics of the multi-level and multi-index of the evaluation system structure,combining relative merits and applicability of various security evaluation methods,based on extenics,analyze the basic content of extenics and establish a matter-element extension model to evaluate the safety of masonry-timber buildings.The safety evaluation system and evaluation model of masonry-timber buildings are applied to Guangfu Temple in Lanzhou City.The final calculated result is consistent with the actual situation,which verifies the rationality of the evaluation system and model.The evaluation results reflect the damage degree of each component,and provide a reliable basis for its maintenance and reinforcement.