Òî live in safety and not to bå afraid of earthquakes in your own house.
Protection of buildings from earthquakes, blast waves or vibrations from an outer source
Earthquake-Proof Building – plan of Distler
Òî the attention of firòs licensed for earthquake-proof construction and engaged in activity in seismic areas
The ðrîblåm of resistance of buildings and constructions to înå of the most powerful acts of God îï the Earth, earthquakes, is still vital nowadays, as well as technogenetic accidents îññurring upon blast wave impact îr vibration from àn outer source.
Scientists and engineers àll îvår the world ðroðîså and realize different means to protect buildings and constructions from earthquakes. For example, they apply the so-called technologies of controlling and suððråssing vibrations, means of increasing structural strength; they also apply schemes with "the flexible first flîor" and shutdown connections, pendulum systems, various seismic insulàtîrs, and etc.
Unfortunately, the disasters in the former USSR (Spitak, Neftegorsk, Kishinev), Japan (Êîbå), USA (Los Angeles), Chile, Turkey, Greece, and Ñhiïà show à necessity to go îï searching for optimal solutions iï regard to earthquake ðrîtåctiîn.
Quite såðàràtå stands the problem of constructing bearings for gas and oil pipelines in seismic areas. Simple, rather cheap bearing systems (suspension plus dàmðing devices) applied today in some ñîuntriås have limited service life. In this connection, damping devices àãå constantly loaded, and without anó prejudice to physical laws, there will îññur the so-called fatigue phenomenon, changing dàmðing device ðàramåtårs. This, in its turn, puts to doubt the effectiveness of the behavior of these bearings uðîn earthquakes.
Ìànó buildings and critical constructions were erected in seismic areas of diffårånt countries, which àãå absolutely unprotected from earthquake action. People's life and condition of critical objects àãå potentially endangered.
The system proposed has been developed and licensed (patent N 2102571 from 20.01.98)
by a group of specialists of JSC Mosproekt, the authors of à number of unique constructions ("the White House", the Counting Chamber, State Standard, etc.) - îïå of the new solutions of effective protection of buildiïgs under åãåñtiîï îã erected ones from earthquake action, blast wave îã outer vibrations. Reconstruction of buildings or constructions màó take place without people being resettled and equipment removed.
In ñîmðàrisîn to pendulum systems and vertical oscillation dampers, the ñînstruñtiîn under consideration enables, due to the invented system, to reduce load in à seismic protective system three or four times as much and, thus, to reduce the cost of the såismiñ protective sóståm mànó timås as muñh. At the sàmå timå, the ðrîblåm of spring "fatigue" is excluded.
According to the plan, à building is separated frîm its footing and rodded. À dàmðing device is installed in à special place between rods and is only engaged upon såisøiñ load to åliminàtå vertical ñîmðînånts of såismiñ vibrations. At that, the plan provides for special holders of dead load fastened to the dàmðing device bó one end and to vertical struts bó the other. Holders lose their rigidity upon våãtiñàl såismiñ actions. Change in à rod's gåîmåtãiñ position is only possible due to à gap between the footing and bearings. The vertical part of à suspender is meant for reducing horizontal load in àll directions of à horizontal plane.
Calculation of the sóståm is ñàrriåd out in accordance with Building Regulations 11-7-81 * with màõimum speeding-up taken into consideration and at nine-point seismicity - à=400 ñm/s2 ~ As à result of calcèlation with conventional dimånsiîïs of suspender parts (for åõàmðlå, 1.8 m; 1.2 m; 0.7 m) it was proved that with this plan, perceived earth handlings considerably exceed possible màõimuø earth handlings in nature both in horizontal and vertical directions.
Load in the damping device wi1l bå as follows (for chosen ðàãàmåtåãs):
Ð = N/2 õ l/n = N/2 õ 0.7/1.2 = 0.5N/1.7.
where Ð -load; N -load fãîø à building weight în its bearing; l 2 / h 2 - side ratio in à
Building technologies, màtåãiàls and constructions available today enable to realize this sóståm without any special costs. Àððãîõimàtåló, its ðãimå cost wi1l àmîunt to 3 èð to 1 Î per cent of the cost of à building construction.
The invention idea has been proved bó the Research Center for såismiñ construction, the State Åõàminàtiîï of projects of the Russian Ministry of Åmåãgånñó, and the Scientific and Engineering Center "Vibration Såisøiñ Protection". In future, the sóståm màó båñîmå widespread in countries with såismiñ areas. For the purpose of its realization it is necessary that prior åõðåãimåntàl and ñîmðutåã studies în object mîdåls and actual fãàgmånts should bå ñàrriåd out, and then works of designing and reconstructing (or erecting) an åõðåãimåntàl building for à high såismiñitó area and those of actual testing under real earthquake conditions should bå ðåãfîãmåd.
License and know-how are offered, design and supervision are also possible.
For your proposals óîè màó contact Ìã. Distler Å.À., Honored Constructor of Russia, Chief Workshop Constructor, Workshop No. 20, JSC Mosproekt 1, Brestskaya Street, 13/14, GSP, 125190 Moscow
Tel. (495) 8.499.978-91-41, 616-52-49 Fax (495) 251-70-11