Research On Multi-scale Seismic Damage Assessment Method For Cross-soil Fracture Frame Structure

Ground fissures,as a serious geological hazard,seriously restrict the economic construction and development of cities.Up to now,some achievements have been made in the study of the formation mechanism,distribution characteristics,dynamic response and prevention measures of ground fissures,but there is still a lack of damage assessment data for the structure across ground fissures under earthquake action.The detailed damage information of the structure is often neglected in the seismic damage evaluation based on components or whole,which results in the lack of systematicness and reliability of the evaluation results.Therefore,it is of great theoretical significance and practical value to use multi-scale damage to study the seismic damage assessment method of frame structures across ground fissures.Firstly,taking damage of concrete material as damage index,a multi-scale evaluation method for damage of beams,columns and whole structures from material damage is proposed based on beam and column components of cross-ground fissure frame structure.According to the stress and failure characteristics of beam and column components,the quantitative description of damage of each component,floor and whole structure is given.Secondly,the ABAQUS finite element software is used to establish the frame structure model of cross-ground fissure,and the damage evolution process of crossground fissure structure under earthquake is studied.Based on the multi-scale seismic damage evaluation method,the damage value of material is obtained by finite element calculation,and the damage degree of the components and the whole structure of crossground fissure is evaluated.At the same time,the damage assessment results of the whole model are compared with those of the test,which verifies the correctness of the method proposed in this paper.Then the whole damage index of the structure is fitted with the maximum acceleration of the first layer,and the correlation between them is found.Finally,the seismic response of the frame structures with different foundation forms is analyzed,and the seismic damage evaluation of the frame structures with different foundation forms is carried out through the inter-story displacement angle and the fast judgment curve based on multi-scale damage,which verifies the feasibility of the seismic evaluation method based on multi-scale damage.