Frictional non rocking seismic base isolator for structure seismic protection (fnsi)

frictional non rocking seismic base isolator for structure seismic protection or FNSI which is installed between a structure and ground, so that earthquake motions transferred only through the FNSI to the structure, comprises,

• a) a sliding hammer (SH) which is a disk has top smooth concave surface and bottom flat surface fixed to ground,
• b) a rotating anvil (RA), which is 2-convex, arrangement connected rigidly through a cylindrical neck, wherein bottom convex of the arrangement has similar radius to the sliding hammer concave, and is large enough so that it, normally, does not slide over the sliding hammer due to horizontal forces affect the bottom convex, due to horizontal reaction forces created partially or completely at the peripheries of the contacted surfaces of the SH and RA, and wherein the other top convex of the arrangement has comparatively smaller radius, and wherein the arrangement situated between the upper face of the SH concave and the lower face of an upside down concave fixed centrally at bottom of,
• c) a hook which is a disk, has flat surface at the top, and wherein the upside down smooth concave has a radius similar to top small convex of the RA, so that the RA small convex fits into the hook concave and can rotate around its own center which is, normally, coincide with the center of the hook upside down concave and wherein the hook upside down concave is connected rigidly and centered at the bottom of the hook disk which is connected to the structure isolated by the FNSI.