SEISMIC HAMMER CANCELATION TECHNIQUE FOR EARTHQUAKE RESITANT (SHC)Seismic hammer cancelation technique is emerging

technology based upon cancelation of relative motion due to seismic waves on ground objects.

SUBMITTED BYANAND BHATNAGAR

POINTS TO BE DISCUSSED Introduction Prologue (techniques we used previously ) Reason behind earthquake destruction Seismic hammer cancelation technique Conclusion

INTRODUCTIONThis presentation demonstrates the new capabilities emerging techniques used for earthquake resistant. In the past, seismic retrofit was primarily applied to achieve public safety, with engineering solutions limited by economic and political considerations. However, with the development of Performance based earthquake engineering (PBEE), several levels of performance objectives are gradually recognised.

PrologueIn present time there are several techniques uses for earthquake resistant, all of them based upon different technologies. But at last motive is same for all to resist against earthquakes. Some of them are mentioned follows.

Concurrent shake-tableCombined vibration control solutionSteel plate shear walls systemEarthquake shelter

SNAPSHOT OF SHAKE TABLE BUILDING MODEL.

Earthquake resistant structures

COMBINED VIBRATION CONTROL SYSTEM

INFILL SHEAR TRUSSES

Reason behind earthquake destructionSeismic waves are waves of

energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that gives out low-frequency acoustic energy. Among the many types of seismic waves, one can make a broad distinction between body waves and surface waves.

Some types of seismic waves

P- and S-waves sharing with the propagation

Cracks due to seismic waves

SEISMIC HAMMER CANCELATION

TECHNIQUE:-In SHC we try to lowering the effect of

seismic waves by compensate them using shock absorbers in home’s base. This is done such a way, so the wall and columns of home is completely isolated from earth surface. By doing this walls of homes do not have any relative motion resulted due to seismic waves, so destruction in homes is too less.

SHOCK ABSORBERS IN HOMESSeismic hammer cancelation

RESON BEHIND SHC IDEAAs we see in everyday life many things on this

earth is isolated from earth surface, these things are only contacted with earth surface but not bounded with earth. And when earthquake comes these things have very less effect of earthquake compared to other things(e.g. Cars and other automobiles, beds, and any thing that is not directly pinned in earth). As we see these things does not effected during earthquakes (only due to seismic waves), and can bear energetic earthquakes compared to bounded things to earth.

Conclusion

From this technique we can attain high resistance against earthquakes. But there are several demerits also, like this technique only can be used only for low rise buildings and construction is hard compared to previously earthquake resistant buildings.

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