SU1715989A1 - Foundation of earthquake-proof building - Google Patents

Abstract

The invention relates to the construction of foundations for seismic resistant buildings and structures. The purpose of the invention is to increase the seismic stability of the foundation. The foundation consists of lower 2 and upper 3 support blocks. The lower block is made with a curved notch, and the upper block is with a convex base installed in the notch of the lower block with a gap filled with an elastic layer 1. The blocks are interconnected by an anchor 9, which is passed through the hole in the lower block, and its upper and lower ends are fixed respectively in the upper block and the base soil. 1 il.

Description

ate

WITH

The invention relates to the construction, in particular to the structures of the foundations of seismic resistant buildings and structures.

The purpose of the invention is to increase the seismic stability of the foundation.

The invention is illustrated in the drawing, which shows the foundation described, a cross-section.

The foundation is an array divided by curvilinear elastic layer 1 into the lower block 2 and upper block 3. on which the building, structure 4 is located. Elastic layer 1, the edges of which can extend both to the upper and to the side faces. The base massif may be filled with an elastic material throughout its whole, or it may have in its central part a gasket 5 of soft metal, for example, lead. Surfaces 6 and 7, respectively, of upper block 3 and lower block 2, respectively, have p-and pi curvatures, the values of which can be found in the following ratios:

/ 01/92 or / Э1 pz.

When / from / 02, the elastic layer 1 has a variable thickness increasing from the center of the plates 2 and 3 to their edges. Through the hole in the lower block 2 from the upper block 3 to the ground & Anchor 9 is attached, made, for example, in the form of a pile with a wide end. The space 10 between the walls 11 of the hole in the lower block 2 and the anchor 9 can be filled with elastic material, and the edge of the walls 11 to avoid stress concentration at the relative offset of the anchor 9 and the block 2 should be run with bevel 12. Anchor 9 can be rigidly embedded in the upper block 3, or wound up in the well 13, made in it, in which

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the space 14 between the bottom and the walls can be filled with an elastic material.

The foundation works as follows.

The seismic effect on the building 4 is transmitted through the lower unit 2, directly connected to the ground 8, in which seismic waves propagate. Movement of the lower unit 2 together with the ground causes a horizontal seismic force acting on the structurally connected building, structure 4 and upper unit 3. At the same time, the elastic layer 1, acting as a vibration isolator-damper, reduces this force, and as a result, the curvilinear ™ the lower block 2 serves as a stop for the upper block 3, which increases the seismic resistance of the building, structure 4. However, a part of the elastic layer 1 located in the central part of the foundation array, BoqnpMHHMaeT. almost the entire vertical load from the building, structure 4 and upper block 3, therefore undergoes more intensive aging, and its replacement is impossible, in the case of aging of the elastic material used in the elastic layer 1, the gasket 5 of this layer in The limits up to half the length I of the upper block 3 (i.e. I / 4 on both sides of the symmetry axes) can be made of a soft alloy or a metal, for example, lead, which will also increase the damping properties of the foundation and therefore its seismic resistance. In this case, the remaining part of the elastic layer 1, for which the elastic material is used, can be divided into separate sector gaskets, which can be extracted alternately interchangeable during the repair process. The implementation of the elastic layer with a variable to increasing from the center

foundation to its edges, the thickness improves the elastic properties of the foundation and facilitates the removal of gaskets. The elastic layer 1 not only reduces the seismic load, but also returns the building to its original position. Both of these functions are facilitated by anchor 9, thanks to which in providing improved seismic resistance of the building, structure .4 due to more effective reduction of seismic force and restoring its original geometrical position, elastic repulsing of soil 8 is involved, and filling of spaces 10 and 14 between the anchors with elastic material 9 and the walls 11 of the hole in the lower unit 2, as well as the bottom and walls of the well 13 in the upper unit 3, provide a smooth interaction between the anchor 9 and the foundation during seismic effects, e of the elastic material in the space 10 serves as a waterproofing torus prevents favoring penetration of ground water into the cavity of the elastic layer.

Claims (1)

The use of the basement described makes it possible to effectively ensure the seismic resistance of buildings and structures at different intensities and different types of seismic effects and in different ground conditions. The invention The foundation of an earthquake-resistant building, including an upper support block with a convex sole, placed in a curvilinear notch of the lower support block with a gap filled with elastic material between them, which are combined with each other to increase the seismic resistance of the foundation an anchor located along their axis, the lower end of which is fixed in the base soil. YAL