SU1361252A1 - Earthquake protection block - Google Patents

Abstract

The invention relates to the construction of a seismic protection unit and reduces its metal intensity. This unit is a protective soschit unit of lower 1, upper 2, intermediate 3, lateral longitudinal 7 and transverse 8 plates. The bottom 1 and top 2 plates are interconnected by a number of vertical rods i4, and the bottom 1 and intermediate 3 plates are connected by rows of inclined rods 5 and 6. On the inner surface of the longitudinal plates there are diamond-shaped protrusions 9 with inclined lateral faces and a vertical end face. The vertical end faces of the protrusions limit the deflection of the vertical rods, and the inclined faces of the adjacent protrusions limit the deflection of the inclined rods. I ep f-ly, 3 ill. //; // /: о S5 N5 SP Figure 1

Description

G, e (m) l L KMJ

The invention relates to construction and can be used in the construction of objects in seismically active regions.

The purpose of the invention is to reduce the metal intensity of the seismic protection unit.

Figure 1 shows the seismic protection unit, a general view; figure 2 - section aa in figure 1; figure 3 - section bb in figure 1.

The seismic protection unit contains the lower 1, upper 2 support and intermediate 3 plates. The bottom 1 and top 2 plates are interconnected by vertical rods 4. The intermediate plate 3 is located slightly below the top plate 2. It has through holes through which the vertical rods 4 are passed. The bottom 1 and intermediate 3 plates are interconnected by two rows of inclined parallel rods 5 and 6, located on two sides of a row of vertical rods 4. While rods 5 and 6 are inclined in opposite directions and the lower and upper ends are rigidly embedded, respectively, in the lower 1 and intermediate 3 plates. On the bottom plate I, along its contour, are attached lateral longitudinal 7 and transverse 8 vertical plates and together with it form a box open at the top. The cavity of the box is filled with some stuff. The rods 4-6 have deflection stops made in the form of diamond-shaped protrusions 9 on the inner surfaces of the lateral longitudinal plates 7. Between the vertical end faces of the peaks 9 are located on a certain one. the distances from them are vertical rods 4, and between the inclined side faces of the protrusions 9 are at a certain distance from them the inclined rods 5 and 6. The vertical rods 4 have the least rigidity in the plane of their row, and the inclined rods 5 and 6 have the lowest rigidity is in planes parallel to the lateral face of the protrusions 9. The lower support plate 1 rests on the base, and the upper support plate 2 carries the upper structure.

The distance between the inclined rods and the inclined faces of the protrusions facing them is determined by the formula

DL, lntg (2oJr90)

& „- distance between slope

P

rod and deflection limiter in the initial state;

D C - maximum deflection of the rod:

OL rod tilt angle;

E (fi is a complete elliptic integral of the second kind;

K (t) is a complete elliptic integral of the First kind; m is the parameter of the elliptic integral, defined by the formula

m

 H IPz

4 N 2P IHMH

where P is the calculated horizontal load on the unit; the number of rods tilted in one direction; elastic modulus of the rod material;

the minimum moment of inertia of the cross section of the rod.

p, E. mits

Seismic protection unit perceives vertical and horizontal, on

straightened along the median plane, load. The vertical load is perceived by the vertical rods 4, and the horizontal load is perceived by the inclined rods 5 and 6. Under the action of the nominal load, as well as with weak earthquakes, when the push force does not pose a danger to the upper structure, the rods 4-6 remain stable the linear equilibrium shape and the block work as a rigid structure. When the load reaches a critical value, the rods 4-6 lose stability and bend. their plane of least stiffness. The deflection of the vertical rods 4 is limited by the end faces of the protrusions 9, and the deflection of the inclined rods 5 and 6 are lateral faces of the adjacent protrusions 9. The upper 2 and intermediate 3 plates move relative to the lower plate 1, thereby absorbing the impulse transmitted to the upper structure. When exposed to

the construction of a dynamic load from periodic fluctuations of the soil, which causes the rods 4-6 to oscillate due to periodic loss and restoration of stability, loose

material contributes to the intensive damping of vibrations.

Claims (2)

Invention Formula 1, a seismic protection unit comprising an upper and lower base plates, an intermediate plate with through holes arranged between them, longitudinal and transverse side plates, longitudinal rows of parallel rods, in the extreme of which the rods are oriented obliquely and rigidly attached to the lower support and intermediate plates, and on average, the rods are vertically oriented, passed through holes in the intermediate plate and rigidly attached with their ends to the lower and upper support plates, and the deflection stator Rods, characterized in that, in order to reduce the metal intensity of the seismic protection unit, the deflection stops of the rods are made in the form of protrusions on the inner surfaces of the longitudinal side plates, each of which is made with inclined parallel sides and a vertical face edge. than the inclined rods are placed in the gaps between the side faces of the protrusions of the corresponding side plate and parallel to these faces and have a minimum rigidity in planes parallel to the side faces of the protrusions, and the vertical st The yarns are located in the gaps between the end faces of the projections of the longitudinal side plates and have a minimum rigidity in the planes of their row. 2. The unit of claim, which is different from each other, and with the fact that each inclined rod is located relative to the faces of the protrusions facing it at a distance determined by the formula i: i intgC i-go) i- Ijslj. where D c is the distance between the inclined rod and the side face of the protrusion in the initial position; U and - the maximum deflection of the rod; o is the angle of the rod; (t is the complete elliptic integral of the second kind; K (t) is the complete elliptic integral of the first kind; m is the parameter of the elliptic integral defined by the formula t them Wg 2p co8 ECs-1A, IR P is the calculated horizontal load on the unit; n is the number of rods tilted in one direction; E - the modulus of elasticity of the material rod; min the minimum moment of inertia of the cross section of the rod. s 2