Grant No.: IAA2071002 |
Grant Agency:Grant Agency of the Academy of Sciences of the CR (GAAVČR) |
Resolved in: 2000 - 2002 |
Principal investigator:Prof. Ing. Ondřej Fischer, DrSc., Institute of Theoretical and Applied Mechanics of the AS CR,v. v.i.1) |
Co-investigators: RNDr. Zdeňka Schenková, CSc., Laboratory of Geodynamics, IRSM AS CR, v.v.i.2)
Co-operation:
Mgr. Cyril Fischer, Ph.1),
Ing. Pavel Kottnauer 2),
Ing. Petr Koudelka, Dr.Sc. 1),
Ing. Jiří Náprstek, Dr.Sc. 2),
RNDr. Richard Pichl, PhD 2),
Prof. Ing. Miroš Pirner, Dr.Sc.1),
Dr. Ing. Stanislav Pospíšil 1),
RNDr. Vladimír Schenk, Dr.Sc. 2),
Ing. Shota Urushadze 1) |
Description: The aim of the project was to achieve applications of stochastic mechanics methods on seismic excitation analyses and on a selection of parameters characterizing threatened excitations of buildings and other structures. Methods of a generation of artificial excitations representing the structure damage risk were tested. The analyses of nonstationary seismic signals revealed that the signal decomposition into a stationary random process and a deterministic modulation function can be applied into an input process for complete stochastic solutions of the structure responses. Reliable results gave combinations of several stationary random processes, modulated by different functions. The signal approximations were solved by the wavelet transforms and the quadratic spline function modulations. The stochastic approach was tested on records of the strong earthquake for California and for South Europe. The excitation signal representation gave the possibility to use the stochastic mechanics to direct solution of the random response of mechanical systems qualified by the statistical parameters.
Another earthquake engineering tasks describing damage effects of seismic excitations are joined to observations of the macroseismic intensity. Macroseismic data of 17 earthquakes occurred in Central and Western Greece in the period 1973-2001 and other 22 earthquakes felt in Prague during the period 1927-1986 were collected. New approach of the macroseismic data processing was developed that allowed isoseismal maps to be automatically drawn. Local differences (residuals) between the isoseismal map values and original macroseismic observations can be identified and attenuation laws to be calculated. An influence of local geology to macroseismic intensity observed was investigated and relations among macroseismic residua and rock types, seismic P-wave velocity and bulk density were found. The relations allowed corrections of probabilistic earthquake hazard values to local geological effects to be introduced. |
| Project in The Research and Development and Innovation System of the Czech Republic (in Czech only) |
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