Research On Safety Assessment Method Of Single Story Industrial Building Post Earthquake Based On Fuzzy Comprehensive Evaluation

Earthquakes are one of the natural disasters known to cause harm to humans.The occurrence of strong earthquake often cause the destruction of human living environment,especially the damage of buildings,and then lead to a large number of casualties and property losses.During the emergency period after the destructive earthquake,the safety assessment of the damaged buildings is an important part of the earthquake emergency work,and it is of great significance to properly settle the affected people and quickly restore the daily production and life of the disaster area.So far,the safety assessment in earthquake site in China mainly relies on the practical experience of senior experts from various scientific research institutes.In 2001,Yang Yucheng,a researcher at the Institute of Engineering Mechanics,China Earthquake Administration,and others compiled the national standard GB/T 18208.2-2001 Earthquake Field Work part II: Building safety Assessment.In 2021,Sun Baitao of Institute of Engineering Mechanics,China Earthquake Administration completed GB/T 18208.2 Earthquake Field Work part 2:Building Safety Assessment(hereinafter referred to as "National Standard for Safety Assessment"(2021)).This standard gives the judgment standard for all kinds of common building structures in earthquake site when they are used as safety buildings of various grades,but they are basically qualitative clauses,and it is very difficult to operate completely according to the standard.In addition,the number of safety assessment experts is seriously insufficient,and their practical experience and professional background are greatly different,which will lead to low efficiency of the assessment,which is not conducive to the development of safety assessment during the earthquake emergency period.In view of the disadvantages of the above qualitative judgment,based on a large number of actual seismic damage,combined with rigorous mathematical theory deduction,this paper puts forward a quantitative method of safety assessment of earthquake-affected buildings considering the importance of each component.The research results of this paper are as follows:(1)According to the seismic damage judgment clause of the single-storey reinforced concrete bent column workshop and single-storey brick column workshop in the "National Standard for Safety Assessment"(2021),in view of the seismic damage phenomenon of Tangshan and Wenchuan earthquake,the typical damage of structural components to be identified is divided into three types: slight damage,moderate damage and serious damage,and the causes of these damage are analyzed emphatically.(2)According to the seismic damage judgment clause of the single-storey reinforced concrete bent column workshop and single-storey brick column workshop used as a safe building in the "National Standard for Safety Assessment"(2021),in view of the seismic damage phenomenon of the two kinds of structures in many large earthquakes in China and the structural characteristics of the two kinds of structures themselves,the judgment criteria of each component of the two kinds of structures under different damage levels are put forward.At the same time,the concept of detail seismic damage is put forward,and the structural whole damage is divided into component damage and component detail seismic damage.(3)According to the divided components and their detail seismic damage,the weight coefficient of each component and its detail seismic damage of the two types of plant structure was calculated by using analytic hierarchy process(AHP)after a lot of trial calculation and discussion with many experts.(4)The damage level of each component and its detail seismic damage is combined from 5 to 3,and the damage proportion is combined to 3,and nine kinds of damage states are obtained,and each kind of damage state is given a specific numerical evaluation coefficient of detail damage.The evaluation sets corresponding to nine seismic damage states are determined by the triangular membership function graph.(5)By analyzing the related theory knowledge of fuzzy mathematics,the two-level fuzzy comprehensive evaluation method of fuzzy mathematics is applied to the safety assessment calculation of these two kinds of plant structure.The method has high practical application value through strict mathematical formula derivation and theoretical analysis.The accuracy and reliability of the proposed method are verified by random sampling of typical damaged plants in actual earthquakes.Based on the national standard and actual seismic damage,a quantitative assessment method for safety assessment of two typical structures in earthquake site is established.This method can deal with the qualitative judgment in the safety assessment by quantitative treatment and greatly reduce the difference between the results of different appraisers.At the same time,the method is derived by strict mathematical formula,and the overall theory is strong.The reliability and scientificity of this method are verified by earthquake examples.