Rapid Assessment Of Damage Degree Of RC Frame Structure After Earthquake Based On Strong Earthquake Scenarios

Earthquake is one of the main natural disasters facing humanity,which can bring huge casualties and economic losses.In order to reduce the loss,save the lives and property of the people,we need to form emergency decisions and carry out rescue work after the earthquake.The key is to establish a suitable rapid evaluation method to determine the scope and extent of earthquake disaster.Most of the damage caused by the earthquake is caused by the collapse damage of the building structure,so the determination of the destruction of the predictive building structure has a significant guiding significance for the reasonable development of rescue work.Reinforced Concrete(RC)framework structure is one of the most common forms in urban architectural structures.Its wide range of uses has a significant social value,so many scientific research workers are involved in the study of RC framework structure.As a country with frequent earthquakes,my country has established a rapid evaluation method of earthquake disaster,which is of great significance to predict the degree of damage of the RC framework structure,and guided the implementation of rescue and relief actions after the earthquake.Therefore,the research goal of this paper is to quickly determine the impact range and extent of the disaster after the earthquake,and divide the main research content into two levels:First,the powerful scene construction method,that is,how to quickly evaluate the scope and earthquake intensity of the disaster area after the earthquake;Second,how to quickly evaluate the degree of damage of the RC framework structure under the premise of known seismic intensity,thereby providing scientific basis for the emergency response of the government and society.The specific research content is as follows:(1)By collecting historical seismic data,earthquake intensity attenuation relationship in north-south earthquake zone is established.First,the historical seismic data in the north-south earthquake zone is analyzed,selecting the main parameter information,and obtains the most suitable fit curve through the statistical method of the least squares method.Then,on the basis of an elliptic model,seismic intensity attenuation relationship is established from the two directions of the long axis and the short axis,respectively.Finally,compare with the results of other researchers to verify the applicability of the model.(2)By using foreign researcher earthquake intensity attenuation forecasting equations,it is further optimized the relationship between earthquake intensity attenuation in the western region of my country.Firstly,the foreign researchers have summarized the earthquake intensity attenuation prediction equation established by different countries,and these equations were screened through historical seismic data in western China.Then,from the aspects of fitting curve,residual trend,and standard deviation,the form of equations in the long-axis and short axis direction of China western region are selected.Finally,compare the elliptical model commonly used in my country to get the difference between different earthquake intensity attenuation relations.(3)Through statistical analysis of the affected situation of the RC frame structure in the historical earthquake,the degree of damage of the RC frame structure in different seismic intensities is obtained.First,the degree of damage and quantity of the RC frame structure in my country’s historical earthquake has collected in the different seismic intensity zones,and compares the description of different intensity zone construction in the "China Earthquake Intensity Table".Then,by statistical analysis,the probability of different degrees of damage of the RC frame structure in different seismic intensity zones is obtained.Finally,the degree of damage to the RC frame structure of the evaluated is quantified by the earthquake index.(4)By statistically analyzed the results of a large number of RC frame structures earthquake simulation shaking table tests,the degree of destruction of the RC frame structure in different strength excitation is obtained.First,the seismic simulation shaking table test results of the more typical RC frame structure at home and abroad were collected,and it is classified according to whether the test model has a padding wall.Then,by statistical analysis,the relationship between the peak acceleration PGA of the input seismic wave and the maximum degree of interlayer positioning angle capable of reflecting the degree of structural damage is obtained.Finally,considering that the maximum interlayer position angle of real building structure is not easy to obtain in the seismic reaction process,the relationship between the maximum interlayer position angle and frequency reduction amplitude reduction in the RC frame structure under test conditions is established.