Zveza društev gradbenih inženirjev in tehnikov slovenije
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Objavljeno v: Gradbeni vestnik - 6, 7 - 1965

Avtorji

Sergej Bubnov, dipl. inž.

Seizmična mikrorajonizacija in potresne obremenitve zgradb

UDK: 550.34:721

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SEISMIC MICROZONING AND SEISMIC LOADINGS

 

Seismic macrozoning, often called seismic zoning, is to be distinguished from seismic microzoning. For macrozoning the auther recommends to appropriate the Medvedev-Sponheuer-Karnik scale in the new Yugoslav codes for seismic design. For microzoning the most treated method in the world is the Soviet method. But it has also some imperfections, especially the following:
this method does not take into account the rigidity of structure built on the corresponding bearing soils. Recent investigations point out the fact that there is a reciprocal dependency between the type of bearing soils, rigidity of the structure (oscillation period of the structure), and seismic loading;
this method provides only one spectral function for all types of bearing soils and for all building objects. It would be advisable to have different spectral functions for different bearing soils.
p s i s
A short description of the Japan method K. Kanai is given does not come into consideration in our circumstances for the present, due to the lack of seis-mologic data on our seismic regions.
Principles for the seismic microzoning for the region Ljubljana are given according to the Soviet method, taking into account also intermediate values for seismic loadings and the dependence of the types of bearing soils and the rigidity of the structure. The ways of carriing out the microzoning of other settlements in seismic regions: are given. Economical aspect of the microzoning is given and the possibility to make the building cheaper by the right evaluation of the seismic bearing soils quality. In IX seismic region there is possible to make reserves by the use of microzoning, for example at buildings on good bearing soils the reserves reached approx. 2 °/# of the value of the object. On the other hand the expences of the building on the unsuitable bearing soils would rise for approx 1%.

 

Seismic macrozoning, often called seismic zoning, is to be distinguished from seismic microzoning. For macrozoning the auther recommends to appropriate the Medvedev-Sponheuer-Karnik scale in the new Yugoslav codes for seismic design. For microzoning the most treated method in the world is the Soviet method. But it has also some imperfections, especially the following:

this method does not take into account the rigidity of structure built on the corresponding bearing soils. Recent investigations point out the fact that there is a reciprocal dependency between the type of bearing soils, rigidity of the structure (oscillation period of the structure), and seismic loading;

this method provides only one spectral function for all types of bearing soils and for all building objects. It would be advisable to have different spectral functions for different bearing soils.

p s i s

A short description of the Japan method K. Kanai is given does not come into consideration in our circumstances for the present, due to the lack of seis-mologic data on our seismic regions.

Principles for the seismic microzoning for the region Ljubljana are given according to the Soviet method, taking into account also intermediate values for seismic loadings and the dependence of the types of bearing soils and the rigidity of the structure. The ways of carriing out the microzoning of other settlements in seismic regions: are given. Economical aspect of the microzoning is given and the possibility to make the building cheaper by the right evaluation of the seismic bearing soils quality. In IX seismic region there is possible to make reserves by the use of microzoning, for example at buildings on good bearing soils the reserves reached approx. 2 °/# of the value of the object. On the other hand the expences of the building on the unsuitable bearing soils would rise for approx 1%.

Karlovška 3
1000 Ljubljana, SLOVENIJA

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