Seismic isolation base

 

(57) Abstract:

The invention relates to the construction, namely, to designs of foundations under the foundations of earthquake resistant buildings. The purpose of the invention is improving the efficiency of the damping of seismic vibrations by providing the reflection and absorption of the vibration energy of the design of seismic isolation Foundation of buildings. This goal is achieved by the fact that seismic isolation base buildings, structures includes located beneath the foundations of buildings, structures elastic base having the shape of an inverted truncated rectangular pyramid, the sides of which consist of alternately stacked horizontal and inclined layers of materials with different acoustic properties and the Central elastic core made of reinforced soil, the mass of seismic isolation base is equal to the mass of the building structure. Experimental studies on models of the proposed design of seismic isolation Foundation confirms its high seismic isolation properties. Application of seismic isolation Foundation will help to improve the earthquake resistance of buildings, structures, particularly unfavorable in seismical> The invention relates to the construction, namely, to designs of foundations under the foundations of aseismic buildings.

Known for the design of earthquake resistant building Foundation, structure, increase the efficiency of the damping of seismic vibrations due to intense vertical bolt connecting the top and bottom base plate, and a horizontal rod with supports at the ends, is placed in the gap of the bulk material [1].

The disadvantage of this design of the Foundation is its lack of effectiveness after the first stage seismography, when the elastic layer and the strained anchor exhausts damping properties.

The closest technical solution to offer is the basis for the Foundation of earthquake-resistant buildings, structures, whose horizontal elastic cushion made of composite of the upper sand layer and a lower layer of crushed rock material and provided with a horizontal concrete slabs placed in the sand layer, and a gap relative to each other, and inclined elastic pillow also made of composite internal clayey-sand layer and the outer of crushed rock soil, when the P> The disadvantages of this Foundation are the low efficiency of seismic protection due to the small difference of the acoustic stiffness of the elastic layers of pillows and the integrity of the system the basis is the Foundation upon exhaustion of the absorption properties of the materials of pillows under seismic vibrations.

The purpose of the invention is improving the efficiency of the damping of seismic vibrations by providing the reflection and absorption of the vibration energy of the structure siamosaurus the base of the building structure.

This goal is achieved by the fact that seismic isolation base buildings, structures includes a braided belt in a horizontal elastic cushion placed under the Foundation, and an inclined elastic cushion, placed on the sides of the Foundation and the bottom and side elastic cushion braided belt made of alternating layers of materials, the acoustic stiffness which differs hundreds of times, and the Central elastic core Foundation of reinforced soil, the mass of seismic isolation base is equal to the mass of the building structure.

Seismic isolation Foundation under the Foundation 1 buildings, structures 2, located in the pit 3, includes: a lower and Bo and polyurethane foam, rubber 5; Central elastic core made of clay soil, laid in layers with a seal (7) and reinforced by geogrid or steel strip reinforcement (6); soil backfill 8.

The principle of seismic isolation Foundation under the Foundation 1 buildings, structures 2 is as follows.

Seismic waves acting on the basis of buildings, structures 2, repeatedly reflected on the limits of the "hard" 4, and "soft" 5 layers of screening zone, the acoustic stiffness which differ in hundreds of times, and therefore the partition boundary layers 4 and 5 there is a large number of interfering waves, which will be mutually strengthened, i.e., the reflection coefficient increases significantly and will lead to significant attenuation of the seismic signal.

In the basis of seismic isolation in addition to the reflected seismic waves occur significantly weakened passing and passing exchange waves penetrating the Central elastic core of reinforced soil. The elastic core is in triaxial stress state and the function of the absorption of passing seismic waves. When exposed to earthquake shock seismic loads are reduced sledstvennoe device, reflecting and absorbing seismic waves. The equality of the masses that make up the system: building - seismic isolation base, provide optimal transfer function of this system, as absorbed by the ground wave is damped by the mass of the seismic isolation base and smooth out large rigidity of the base. In principle it is possible to choose the design of seismic isolation base of the building, structure (number, thickness and acoustic stiffness of the layers for specified seismic impact that the effect of the earthquake on the building, the building will be minimized or eliminated completely.

Conducted on models of experimental studies of the proposed design of seismic isolation Foundation confirms its high seismic isolation properties.

Application of seismic isolation Foundation will help to improve the earthquake resistance of buildings, structures, particularly in the construction of the adverse seismic soils, such as subsidence, bulk, stacked heterogeneous soils, etc.

Sources of information

1. USSR author's certificate N 981512, E 02 D 27/34, 1982.

2. Copyright witness the shielding zone in the form of a horizontal elastic cushion, placed under the Foundation, and an inclined elastic cushion, placed on the sides of the base, characterized in that the bottom and side elastic cushion is made of alternating layers of materials, the acoustic stiffness which differs hundreds of times, and the Central elastic core Foundation of reinforced soil, the mass of seismic isolation base is equal to the mass of the building structure.

 

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3 cl, 1 dwg

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