SU1286682A1 - Foundation for earthquake-proof building or structure - Google Patents

Abstract

The invention relates to the construction of foundations for earthquake-resistant buildings, construction, and allows reducing seismic impacts on a building or structure, as well as reducing material consumption. The foundation includes a grillage consisting of the upper 1 and having through holes 2 of the lower 3 plates with an anti-friction gasket 4 between them, central piles 5 freely flowing through the holes 2 in the lower plate 3 with filling gaps with elastic material 6 and rigidly attached to the upper plate 1 and peripheral piles 7. Through holes 2 are made in the central part of the bottom plate 3, and peripheral piles 7 are rigidly attached to the bottom plate 3 outside the perforated part. When this hole in the bottom plate 3 can be communicated with each other with the formation of a common cavity. The relationship is given to determine the length H of each pile. 1 hp f-ly, 2 ill. g (/

Description

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The invention relates to the construction, in particular to the construction of foundations in seismic areas.

The purpose of the invention is to reduce seismic effects on a building, construction, and also to reduce material consumption.

FIG. 1 shows the proposed foundation, a section in FIG. 2 - the same embodiment.

The proposed foundation includes a grillage consisting of the top 1 and having through holes 2 of the bottom

3plit with anti-friction gasket

4 between them, the central piles 5, freely passed through the holes 2 in the bottom plate 3 with filling gaps with elastic material 6 and rigidly attached to the top plate 1, and peripheral piles 7. Through holes 2 are made in the central part of the bottom plate 3, and the peripheral piles

7 are rigidly attached to the bottom plate 3 outside the perforated part thereof. The length H of each pile is determined by the ratio

To oh 1lp

where Vj is the velocity of propagation of longitudinal seismic waves in the basement soil, m / s;

T is the predominant period of seismic vibrations of the soil in the construction area, with the holes in the bottom plates can be communicated with each other with the formation of a common cavity 8, which makes it possible to reduce the material intensity.

 The foundation works as follows.

A longitudinal seismic wave, races 45 through holes in the bottom plate with a base propagating in the ground, is reflected and scattered from the peripheral piles forming a seismic insulating screen, and the efficiency of reflection of these waves increases due to the fact that these piles are rigidly connected to due to the high velocity of seismic wave propagation in reinforced concrete compared to the velocity in the ground, the pressure of the seismic wave from its approach is significantly further weakened by passive repulsion ie this is not deformed

with a physical push of the soil at the peripheral piles on the opposite side of the foundation.

Horizontal,: The deformations of these piles and, correspondingly, the lower base plate, are transmitted to the upper plate and the building located on it, the structure in a significantly weakened form and only due to the frictional forces between the upper and lower plates.

The depth of the pile is due to the fact that at depths H 0, the horizontal accelerations and movements during seismic effects are approximately two times lower than in the surface layers, therefore, the foundation construction makes it possible to reduce the calculated seismicity of the aboveground part of the building, 1 point,,

At the same time, supporting the upper plate to the lower one can be performed through rollers or swinging supports (not shown), which further enhances the effectiveness of reducing seismic loads,

Friction in anti-friction devices and the operation of the central piles of the foundation to bend prevent the catastrophic movement of the above-ground part of the building, the structure, which is a kind of strain relief under seismic effects.

Claims (2)

Invention Formula 1, The foundation of a seismic resistant building, a structure, including a grillage consisting of the top and having through holes of the bottom plates with an anti-friction layer between them, central piles freely missed filling the gaps with elastic material and rigidly attached to the top plate, and peripheral piles, characterized in that, with the aim of reducing seismic effects on the building, the structure, through holes, are made in the central part of the bottom plate, and the peripheral piles are rigidly attached to the bottom slab outside the perforated part, the length H of each pile is determined by the ratio H 5 0.1 V t o p Vg — velocity of propagation of longitudinal seismic waves in the base soil, m / s; T is the predominant period of seismic soil oscillations in the construction area, s. 2. A foundation according to Claim 1, characterized in that, in order to reduce material consumption, the holes in the bottom plate communicate with each other to form a common cavity. 2