Seismic isolation system
View Patent ↗A seismic isolation building system, and method thereof, for buildings and other structures that is well suited to protect lightweight low rise buildings including houses against earthquakes, particularly where the structure is located in low lying wet regions subject to liquefaction. The system utilizes a platform with piles extending from the platform into a ground, wherein the piles are connected to the platform via at least one shear bolt that links a platform plate to a pile. The shear bolt or bolts are designed to shear in an event of a predetermined level of seismic activity freeing the platform and structure on the platform to move independent of the piles. Post seismic activity, the platform and structure are moved, repositioned and/or re-fixed to new or existing piles thereby minimizing damage to the structure and hence repair costs.
1. A seismic isolation building system comprising:
at least one structural platform laid horizontally on a ground surface providing a foundation for a structure thereon;
a plurality of piles extending from the platform into the ground surface on which the at least one structural platform is placed;
at least one plate inserted between the pile and platform that is fixed to the platform, wherein said at least one plate comprises at least one platform plate; and,
at least one further plate fixedly linked to the pile and which abuts the platform plate, wherein said at least one further plate comprises at least one pile plate;
wherein the plurality of piles are connected to the at least one structural platform via at least one shear bolt that links a platform plate of said at least one platform plate to a pile of said plurality of piles, and,
wherein the at least one shear bolt is designed to shear during a predetermined level of seismic activity freeing the at least one structural platform to move independent of the plurality of piles, and which, post seismic activity, be moved, repositioned and/or re-fixed to new piles or existing piles of said plurality of piles.
2. The system as claimed in claim 1 , wherein the at least one platform is at least one structural insulated panel (SIP).
3. The system as claimed in claim 2 , wherein the at least one SIP comprises a core manufactured from expanded polystyrene foam (EPS), extruded polystyrene foam (XPS), polyisocyanurate foam, polyurethane foam or composite honeycomb (HSC).
4. The system as claimed in claim 2 , wherein the SIP comprises two opposing structural panels or boards manufactured from orientated strand board (OSB), sheet metal, plywood, cement, magnesium oxide or any combinations thereof.
5. The system as claimed in claim 1 , wherein the at least one structural platform is fastened to sides of rim perimeter boards, and further comprising at least one truss beam located inside or about the at least one structural platform.
6. The system as claimed in claim 1 , wherein the at least one platform plate and the at least one pile plate are flat plates which slide against each other with a calculable amount of friction.
7. The system as claimed in claim 1 , wherein the at least one pile plate is smaller than the at least one platform plate.
8. The system as claimed in claim 1 , wherein one or more of the at least one platform plate and the at least one pile plate is circular in shape.
9. The system as claimed in claim 1 , wherein the at least one shear bolt links the pile to the at least one platform plate, and wherein the at least one shear bolt is not attached to the at least one pile plate.
10. The system as claimed in claim 1 , wherein the at least one shear bolt is linked to the pile via a collar that fits around the pile and which includes at least one flange to which one end of a bolt of the at least one bolt attaches to.
11. The system as claimed in claim 1 , wherein one or more of the at least one platform plate and the at least one pile plate is manufactured from materials with a specific coefficient of friction at opposing surfaces to resist sliding between plate surfaces of the at least one platform plate and the at least one pile plate.
12. The system as claimed in claim 1 , wherein one or more of the at least one platform plate and the at least one pile plate is manufactured from steel.
13. The system as claimed in claim 1 , wherein at least one service line passes through the at least one structural platform, wherein the at least one service line is manufactured from a flexible and/or extendable material.
14. The system as claimed in claim 1 , wherein a substantially impermeable barrier is placed between the at least one structural platform and the ground surface on which the at least one structural platform is placed.