The Research Of Physical Measure Of Seismic Intensity And Damage Potential Of Earthquake Ground Motions

The research of physical measure of seismic intensity is a history and basic subject and the study of damage potential of earthquake ground motion has been worked on for more than one hundred years. Because of the lack of the material about the seismic damage the study of this field is carried out based on the accumulated earthquake records and damage material. Since different earthquakes have different source mechanism, ground motion characteristics, damaged structures and seismic intensity evaluation the method of mixing different earthquake material with different time and location to study physical measure of seismic intensity is not valid. But this method is unavoidable. Also, though the study before classify the kind of structures it is very cursory and simple. In addition, the ground motion parameters considered only included peak amplitude and few spectrum parameters and the energy and duration parameters were never taken into account. As for this condition the study of physical measure of seismic intensity and damage potential of ground motion based on the abundant records and specified damage material from Chi-Chi earthquake is conducted in this paper. The main contents and conclusions of this dissertation are followed.(1) The material about damage to structures of Chi-Chi earthquake is collected and based on it the isoseismal is plotted using the method of mean damage index.(2) Three kinds of structures as for masonry structures, RC frames and RC shear wall frames are chosen for their generally popularization. The response and damage index of these structures subjected to different kind of ground motions are calculated. The study of the correlation between parameters and the structure response and damage index is conducted in order to confirm the correlation between ground motion parameters and structure response and find out the damage potential of ground motion. The results are followed. Einput, Eh and PGA reveal very good correlation with response of all the structures. The correlation coefficient between Einput, Eh and all the structure response except masonry structures is nearly 1, which indicates the energy parameters can reflect...