Prediction And Protection Measurements Of Seismic Damage Of Ancient Buildings In Urban Area Of Yibin City

The historical earthquake damage indicates that the damage of buildings is the main form by earthquake damage in cities. The most effective measures, which improve comprehensive ability of earthquake-resistant, decrease seismic damage to the maximum degree for the cities, are as follows: predicting the destruction of buildings, economic losses and casualties scientifically; analyzing the weak point in the earthquake-resistant and damage- prevention from a city and putting forward the defending counter-measure. Analysis on the measures which are the main contents of earthquake-resistant and damage-prevention of a city has most important realistic meanings.On the basis of the layout of earthquake-resistant and damage prevention of Yibin City, researches on damage prediction and correspond countermeasures of buildings have been carried on in two aspects as follows:Firstly, have carried on the analysis contrast of the method of prediction of earthquake calamity of domestic and international building, general method, the pluses and minuses and scope of application to summarize prediction of earthquake calamity of the buildings, have put forward subject matter and settlement measure existing in prediction of earthquake calamity of the building at present.Secondly, Investigate the current situation of ancient building of urban area of Yibin , Have explained the method of prediction of earthquake calamity and step of the main type of ancient building of urban area of Yibin, provide the calculation instance of prediction of earthquake calamity, Have finished prediction of earthquake calamity of ancient building , earthquake economic losses , the homeless and casualty's estimation in the urban area of Yibin, point out the weak link of taking precautions against natural calamities in antidetonation of ancient building of urban area of Yibin , has put forward the corresponding countermeasure of defending..Because of above-mentioned research, there are the main conclusions drawn:①The prediction of earthquake calamity of the building is a fuzzy , systematic , complicated problem, the existing method regard statistics law of the earthquake , expertise , theory analysis and experimental study as more bases, each have good and bad and specific scope of application.②Should direct against different building condition , place condition , intensity of earthquake and already experienced etc., adopt different prediction methods to carry onthe prediction of earthquake calamity of the building, in order to predict the result reaches anticipated accuracy, dependability and effectiveness;③ Set up earthquake matrix from 6 degrees to 9 degrees of earthquakes function after setting up 3 kinds of ancient buildings of urban area of Yibin, become the important basis of instructing antidetonation to take precautions against natural calamities. The damage conditions of different ancient buildings under different intensity are as followings: All kinds of ancient buildings are intact basically under 6 degrees of earthquakes function; The tower ancient building of structure, ancient building of timber structure of 7 degrees of earthquakes function are shown as basically mainly intactly, other ancient buildings rely mainly on destroying slightly ; The ancient building of timber structure still relies mainly on intact basically under 8 degrees of earthquakes function, other ancient buildings rely mainly on the fact that destroy medium-sizedly; The ancient building of timber structure relies mainly on destroying slightly under 9 degrees of earthquakes function, The tower ancient building of structure relies mainly on the fact that destroy medium-sizedly, other buildings rely mainly on destroying seriously;④ The result of prediction of earthquake calamity of the ancient building has reflected the earthquake degree when the earthquake comes in the future, while working out the urban area antidetonation of Yibin and taking precautions against natural calamities and planning, Is it is it take place as to experience medium-sized ancient building destroyed above consider determining and strengthening antidetonation to influence to surmount probability 10% earthquake one year;⑤The direct economic losses caused by destruction of the ancient building are the important parts of the economic losses of urban earthquake, its is involved in earthquake degree of all kinds of ancient buildings with the whole area of ancient building , structure type , earthquake intensity mainly;⑥The direct economic losses destroyed in ancient building where different earthquake intensities cause increase progressively toward high earthquake intensity according to 3 to 4 times, The direct economic losses destroyed in ancient building of the urban area of Yibin are from 6 degrees to 9 degrees of proportionate relationships which are 1:3.6:14.1:37;⑦Experience basic earthquake when setting up defenses earthquake intensity (7), ancient direct economic losses about 20 million yuan that building destroy , Yibin of urban area, homeless personnel about 31270 people, and lose the most with the earthquake of the ancient building of the structure of the brick and tile;⑧The casualties that the earthquake causes collapse with the ancient building mainly, destroy seriously and medium-sized degree and ancient the whole area of building that destroy and take place earthquake ancient building indoor number at closely related with, homeless personnel collapse with the ancient building mainly when the earthquake, destroy seriously and the medium-sized degree that destroy and the whole area of the ancient building and per capita living space of the city are closely related with.