SU1379435A1 - Earthquake-proof building or strucure - Google Patents

Abstract

The invention relates to earthquake-resistant buildings, structures, and allows to increase these seismic-resistant Bocib. The building, the structure includes foundation 1 and suprafundum, part 2, placed with a gap of 3 V / J 16 L 3, sliding supports 4 are installed, rigid stops 8 horizontal displacements, vertical links 9, consisting of the upper element 10 of the T-section and anchored in the base of the lower element 1 in the form of a slot grip, which engages with the element 10 with the possibility of its horizontal movement, and seismic isolation The device 12, consisting of a stand 13, which is supported by the lower spherical hinge I4 on the projection 15 of the foundation, and the upper hinge 16 which is vertically movable, is connected to the supra-foundation part. Levers 17 are rigidly attached to the stand 13 from the opposite ends. loads 19 with a gap of 20 from the surface of the foundation. 4 or about 9 10 Y S. 5 (L oo QO 4: 00 SL 2 {Fig. /

Description

The invention relates to the construction, in particular to the device seismic resistant buildings, structures with active seismic protection

The purpose of the invention is to reduce, seismic stability of the building, construction by accelerating the dissipation of the oscillation energy.

Fig, 1 shows the proposed 10 building, structure, longitudinal section; FIG. 2 is a diagram of the seismic insulating device j in FIG. 3 — node 1 in FIG. 1; figure 4 - section aa in fig „1 about. .15

The earthquake-resistant building, the structure includes foundation 1, the sub-foundation structure 2, placed with a gap of 3 relative to the foundation 1. In the gap 3 there are sliding 20 supports A, consisting of the upper 5 and lower 6 supporting elements with anti-friction plates 7 between them (for example, , from fluoroplastic A), rigid limiters 8 horizontal 25 displacements, vertical connections 9 from the upper element 10 of the T-section and anchored in the foundation I of the slot grip 11 from two L-shaped plates that engage with 30 its horizontal movement, and the seismic isolation device 12, consisting of a stand 13, the lower spherical hinge 14 resting on the protrusion 15 5 of the foundation 1, and the upper hinge 16 vertically movable connected to the supra-foundation part and rigidly attached in a vertical plane parallel to the main building axis, 40 structures in plan, on opposite sides of the rack 13 are two levers 17. By the free end of each lever 17, the load 19. with a clearance of 20 from the surface of the foundation I, and the angle / inclination of the bracket 18 to the horizontal is less than the angle l of the inclination to the horizontal of the tangent to any point of the path of the free end of the lever 17 in the part of the movement of its end after the load 19 on the surface of installation 1,

To facilitate installation and improve the accuracy of the assembly of its vertical links, i.e. in order to avoid a vertical gap in the connection of the elements 10, the top element 10 is fastened with bolts 21 to a plate 22 rigidly anchored in an identi cal structure, and the holes 23 for bolts 21 in the plate 22 have an elongated shape

The building works as follows.

Sliding supports 4 perceive only the vertical load, ensuring the free movement of the superstructure in the horizontal plane. Before the seismic effect, the underfound part, in the presence of sliding supports 4, is in a state of stable equilibrium, which is ensured by the balanced forces of the seismic isolation device 12 due to the equal but different in magnitude moments of the two loads 19 relative to the center of the 14th rack 14.

With weak horizontal oscillations of the base, the inertial load acting on the supra-foundation part does not exceed the frictional forces between the under-foundation part and the foundation, as a result of which the building or structure works as usual.

When the inertial load exceeds the value of the friction force, the mass of the under-foundation part slides relative to the foundation and the horizontal forces are transferred to the pillars 13 of the seismic insulating devices 12. When the pillar 13 tilts, the levers 17 drive the loads 19 in the vertical plane with changing their initial height above the surface of the basement, which infects the seismic isolation device 12 from equilibrium with the occurrence of a restoring horizontal force applied to the upper hinge 16 of the rack 13 and directed The reverse horizontal seismic force acting on the supra-foundation part. A necessary condition for creeping the restoring force and ensuring stable equilibrium of the seismic isolation device 12 is the center of gravity of the load 19 below the center of the lower hinge 14. When the strut rolls with the lever 17, the center of the weight of the load 19 move along an arc of a circle with a center in the lower hinge 14, while the shoulder from the center of the latter to the center of the weight of the lifted weight increases, and the shoulder to the center of the weight lowering the load decreases, leading to an increase in

ten

reactive moment

of the moment or horizontal restoring force is determined by the selection of the calculated load arm 19 and its mass from the condition that the restoring force exceeds the sliding forces in the sliding supports, vertical connections and hinges 14 and 16 of the rack 13

With significant ground movements, as seismic frequencies approach the natural oscillation frequencies of the building, load 19 abuts the foundation 1 surface. With the elimination of the gap 20, the counterweight effect ceases, the unloading moment of the second lever increases with the frequency of the fundamental wave oscillating with the output of the resonant mode , which increases the reliability of jn seismic isolation of buildings and structures.

The dispersion of the oscillation energy and the magnitude of the relative displacement of the above-foundation part depend on the selection of the dynamic parameters of the seismic insulating device 12,

To prevent the impact, the connection of the load 19 with the free end of the lever 17 is adapted to provide 1379435

The value of the reactive is the calculated value of the gaps). With

15

changing the application horizontally, the load by 90 in operation includes | Other seismic insulating devices 12 located perpendicularly.

The variation of the dynamic characteristics of the building with changes in the dynamic power of the building, which increases its seismic stability due to the reduction in the possibility of entering the resonance mode.

Thus, in the proposed building, the structure provides improved seismic resistance by accelerating the attenuation of the energy of the oscillations.

Claims (1)

Invention Formula A seismic resistant building, the structure including the foundation and the supra-foundation part, placed with a gap, which has upper and lower supporting elements with an anti-friction pad between them, a horizontal displacement limiter and vertical links, the ends of which are rigid 0 n five five changing the application of the horizontal load by 90 into operation | Other seismic insulating devices 12 located perpendicularly are included. The magnitude of the restoring force, which varies with oscillations, changes the dynamic characteristics of the building, structure, which increases its seismic resistance due to the reduced possibility of entering the resonance mode. Thus, in the proposed building, the structure provides seismic resistance by accelerating the attenuation of the oscillation energy. Invention Formula A seismic resistant building, a structure comprising a foundation and an over-foundation part, placed with a gap, in which upper and lower supporting elements are installed with antifreeze gasket between them, horizontal displacement restraints and vertical links, the ends of which are rigidly No load 19 to foundation 1, i.e. cargo suspension connectors have a gap, while the slope The movement of the lever I 7 after the abutment -JQ is attached to the foundation and to the supra-foundation part, characterized in that, in order to improve the seismic stability of the building, by increasing the oscillation energy, it is provided with a stand attached by upper and lower hinges at its ends to the basement and to the supra-foundation structure, and an arm with rigidly attached to its opposite sides with loads of the same to the horizontal, the brackets 18 are smaller than the angle / j of the inclination to the horizontal of the tangent to the trajectory of the end of the p) hchaga 17. Vertical links 9, installed for the perception of strong vertical seismic effects, provide for relative horizontal displacements of the under-foundation part. These connections in the vertical direction are made rigid without shock absorbers, and the vertical seismic load is perceived according to the scheme of buildings on common foundations. In order to limit the relative horizontal shift of the basement part and the foundation, rigid barriers of 8 displacements were introduced into the seismic protection system (for example, zhelezobetonnye protrusions in the depressions with 35 40 45 50 the masses are freely suspended from the ends of the arms and away from them, the lower hinge of the post is located above the free ends of the levers, the levers are located in a vertical plane parallel to one of the main axes of the building, the building is in plan, and the vertical connections are made up of composite height and covering them with the possibility of horizontal movement of the lower elements. the masses are freely suspended from the ends of the arms and away from them, the lower hinge of the post is located above the free ends of the levers, the levers are located in a vertical plane parallel to one of the main axes of the building, the building is in plan, and the vertical connections are made up of composite parts in height from the upper and covering them with the possibility of horizontal movement of the lower elements. 13 FIG. g 78 cpi / g3 Fig4