Aseismic bearing

 

(57) Abstract:

Usage: the supports of buildings and structures. The inventive between the Foundation and advancement design posted by the elastic element to give three coordinate axes, filled with damping fluid. The elastic element is designed as a welded bellows corrugated in the radial and circumferential directions of the main membrane and an additional membrane. At one extreme the main membranes made of calibrated holes, it is on the outer contour and the hard center with the formation of a sealed cavity connected to an additional membrane. The additional stiffness of the membrane in the radial and axial directions is less in relation to the main membrane. 2 Il.

The invention relates to support structures earthquake-resistant buildings, structures and can be used as absorbers in facilities operating with high vibration and shock acceleration: on road and rail transport, power plants and nuclear reactors, to install precision equipment, as damping devices in the stretch of high-rise structures.

The purpose of the invention oprosti metoikoi support; in Fig. 2 - strain state of the aseismic support during the earthquake.

Aseismic bearing contains an elastic element 1 with the malleability of the three coordinate axes, made in the form of welded bellows corrugated in the radial and circumferential directions of the membranes 2, installed with clearances through the annular distancer 3 outer diameters of the membranes 2 and the o-ring bonnet space 4 on the perimeters of the Central hole 5 of the membranes 2, the extreme of which is the top and bottom are made without the Central hole 5. At one extreme of the membrane 2, for example, the upper made of calibrated holes 6, with the same external contour and the hard center with the formation of a sealed cavity connected to an additional membrane 7, made with less stiffness in the radial and axial directions relative to the main membranes. With the elastic member 1 in the center is rigidly connected to the vertical elements of the seal support 8 and 9, made in the form of pipe ends and the slots 10, the free ends of which are embedded in the Foundation II and advancement design structures 12, made for example of concrete.

In the upper part of a corrugated diaphragm 7 has a filling nozzle 13 at the bottom of the corrugated memb is, for example polymethylsiloxane fluid type PMS, kerosene or fuel oil. In addition, to improve the damping properties of seismic supports in horizontal directions corrugated membrane 2 may be made of a material with high dissipation, and intermembrane cavity can be partially filled by an elastic-plastic material such as polyurethane SKU-6 with a through vertical and horizontal channels for damping fluid (not shown).

The elastic element 1 may be made in the form of welded bellows corrugated in the radial and circumferential directions of the membrane, the United pairs of outer and inner flange (not shown), the profile of the corrugation which is chosen from the condition that the deformation of the elastic element 1 surface adjacent membranes must be paired. In this case, the annular distancer 3 and 4 are not required.

The stiffness of the elastic element 1 aseismic bearing in the axial and radial directions is determined by the modulus of elasticity of the material, the outer and inner radii, the thickness of the membranes and the height of the corrugation in the radial and circumferential directions of the membranes 2 and may be provided in a wide range.

Additional membrane 7 so the thin ribbon in the form of a shell of revolution containing concentric cylindrical sections with corrugations in the circumferential direction with the end ring section with a corrugation in the circumferential direction in the upper part of the casing 7, the outer annular flange and a flat butt in the lower part of the inner cylindrical surface. Additional membrane outer flange welded to the top of the membrane 2 and the lower planar side to the upper sealing element support 8 and the hard center of the top of the membrane 2. In the case of the proposed design of earthquake-resistant support as precision dampers for installation vasotocin devices with a small weight on the objects, such as inertial navigation systems, instead of the fluid 15 as damping medium, you can use the air, and as the material of the membrane 2 to use the high precision of the dispersion-hardening alloy type SHNUR-VI with a high level of elastic properties (modulusor1200 MPa, q Q 60000 - 70000). In this case, the design supports simplified by eliminating additional membrane 7.

Seismological support works as follows.

Dynamic fluctuations of the Foundation of the 11 facilities with fixed therein by a vertical sealing element 9 is of the axes in relation to advancements construction 12 and the vertical sealing element 8 when the earthquake or traffic impacts will lead to deformation and mutual displacement of the centers of the membranes 2 of the elastic element 1 along the three coordinate axes, the weakening of the shock pulse loads due to low contact stiffness transmitted from the base 11 to advancements construction 12, reduced contact stresses, displacement of the damping fluid 15 in the intermembrane cavity between the membranes 2 in the radial direction and from the intermembrane cavity in the cavity between the upper membrane 2 and the additional membrane 7 through an orifice 6 (the direction of movement of the damping medium in Fig. 1 indicated by arrows for the case of compression of the elastic element 1) that will lead to the emergence damping forces and moments along the three coordinate axes. The effectiveness of damping on the vertical axis of support increases with decreasing diameter and number of calibrated holes 6 in the upper corrugated membrane 2. High-frequency components of the dynamic fluctuations of the Foundation 11 due to the large inertia of the structures are smoothed out by the elastic element. 1. As an example in Fig. 2 shows the deformed aseismic bearing in the direction of the action of dynamic forces from the side of the sealing element 9 in the base 11 in the plane of the drawing to the left upwards.

Aseismic bearing functional and upside down, and educstional reliability and durability in comparison with the known seismic supports and shock absorbers.

Aseismic bearing containing placed between the Foundation and advancement design of buildings fixed vertical elements of the seal support rigidly connected with them elastic element with the malleability of the three coordinate axes, filled with damping fluid, characterized in that, with the aim of simplifying design support and enhance the seismic resistance of structures, the elastic element is designed as a welded bellows corrugated in the radial and circumferential directions of the main membrane and an additional membrane, the outermost of the major membranes made with hard centers connected with a vertical sealing elements, one at the main membranes made of calibrated holes, it is on the outer contour and the hard center with the formation of a sealed cavity connected to an additional membrane is made with less stiffness in the radial and axial directions relative to the main membranes.

 

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