RU2792872C1 - Method for vibration isolation of a modular building in high seismic conditions - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: supports can be used to damp vibrations from technical equipment. A method for vibration isolation of a modular building in high seismic conditions, which makes it possible to perform vibration isolation in a resonant mode by installing spring dampers, each of which contains a base, a cover and elastic elements located between them in the form of helical springs with a dry friction damper, the base is connected to the cover by means of a damper dry friction, consisting of a lower sleeve rigidly connected to the base, and an upper sleeve coaxial with it, rigidly connected to the cover, contains an axisymmetric and coaxially installed helical spring inside it. During the construction of modular buildings, their foundations are designed in the form of free-standing piles, which are combined at the heads with transverse beams, in the longitudinal direction, the pile heads are combined with longitudinal struts, and spring dampers are installed on top of horizontal cross ties at each reference point of the pile, which are located over the entire area of modular building.

EFFECT: reduction in internal forces in the bearing elements of buildings and structures, significant reduction of the bending moment values, which leads to a decrease in the material consumption of structures.

1 cl, 3 dwg

Description

The invention relates to the field of construction, in particular, supports can be used to damp vibrations from technical equipment.

A rubber-metal support is known (patent RU 101 514 F16F 1/40, 2011), in which the elastomeric supports used to protect structures from seismic effects are layered structures from alternately stacked sheets of natural or artificial rubber with a thickness of 5-20 mm and sheets of metal with a thickness of 1.5-5.0 mm. Flange plates 20-40 mm thick are installed from above and below. Sheets of rubber and metal are interconnected by vulcanization or with the help of special binding materials. At the ends of the elastomeric supports, steel support plates are provided, through which the supports are attached to the structures of non-seismically isolated and seismically isolated parts of the structure.

The disadvantage of this reinforced elastomeric support is the rapid loss of product performance due to the low resistance of rubber elastomeric layers to aging and high negative temperatures.

The closest in technical essence to the claimed invention is the foundation of an earthquake-resistant, new, existing or reconstructed building or structure (patent RU 101 053 E02D 27/34, 2011), in which the supports are made of rubber plates with low dissipative properties. The lead core is placed in pre-formed holes in the center or along the perimeter of the support; the total diameter of the core is from 15% to 33% of the external diameter of the support.

However, this method of elastomeric bearings with lead cores has parameters less sensitive to the values of vertical loads, speeds and load history, ambient temperature and aging than the parameters of elastomeric bearings without lead core. The objectives of the claimed invention are:

- reduction of internal forces in the bearing elements of buildings and structures, which allows to significantly reduce the values of bending moments;

- increase in the service life of the product;

- reducing the material consumption of building structures.

The tasks are solved by the fact that in the method of vibration isolation of a modular building in high seismic conditions, the principle of operation corresponds to the presented supports, according to the invention, the working medium of which is a spring and a metal pad made of CrNi steel reinforcing wire with a special anti-corrosion coating. In elastomeric bearings, the working medium is rubber and metal sheets, the disadvantage of which is the rapid loss of performance characteristics of the product due to the low resistance of the rubber of the elastomeric layers to aging and high negative temperatures.

The drawings show a general view of the device (Fig. 1) and a section (Fig. 2) of spring dampers for implementing the method of vibration isolation of a modular building in conditions of high seismicity.

The spring damper device comprises a base 1 with holes 2 for fastening on top of the horizontal cross braces of the modular building structure, a cover 3 with holes 4 for fastening the spring damper. The base 1 is connected to the cover 3 by means of a dry friction damper 10, consisting of a lower sleeve 7 rigidly connected to the base 1 and an upper sleeve 8 coaxial with it, rigidly connected to the cover 3. At least two elastic elements 5 and 6 are located around the damper 10 , connected by means of pins 9 with cover 3 and base 1, and made in the form of cylindrical helical springs, and inside the damper 10 axisymmetric and coaxial to the upper 8 and lower 7 sleeves there is a spring 11 with a built-in combined damper. The method is carried out as follows.

The foundations for the modular building are designed in the form of free-standing piles, united at their heads by transverse beams. In the longitudinal direction, the pile heads are connected by longitudinal struts.

Spring dampers are installed on top of the horizontal cross braces at each pile anchor point, which are located throughout the entire area of the modular building.

The drawing shows a General view of the location of the spring dampers (Fig. 3).

The bending moments in the pile insertion are reduced by 2.17 times in the longitudinal direction and by 1.13 times in the transverse direction. The magnitude of the longitudinal force in piles does not depend on the installation of spring dampers.

The installation of spring dampers is an effective way to reduce internal forces in the bearing elements of buildings and structures, which makes it possible to significantly reduce the values of bending moments, which leads to a decrease in the material consumption of structures. Spring damper works as follows.

During vibrations of the vibration-isolated object located on the cover 3, the cylindrical helical springs 5 and 6, as well as the damper 10, perceive both vertical and horizontal loads, thereby weakening the dynamic effect on the vibration-isolated object, i.e. Spatial vibration protection is provided.

The use of the claimed invention makes it possible to effectively reduce internal forces in the bearing elements of buildings and structures, significantly reduce the values of bending moments, which leads to a decrease in the material consumption of structures.

It is economically feasible to use spring dampers due to lower material and labor costs for the installation of supports.

Claims (1)

A method for vibration isolation of a modular building in high seismic conditions, which makes it possible to perform vibration isolation in a resonant mode by installing spring dampers, each of which contains a base, a cover and elastic elements located between them in the form of cylindrical helical springs with a dry friction damper, the base is connected to the cover by means of a damper dry friction, consisting of a lower sleeve rigidly connected to the base, and an upper sleeve coaxial with it, rigidly connected to the lid, contains an axisymmetric and coaxially installed cylindrical helical spring inside it, characterized in that during the construction of modular buildings, the foundations for the modular building are designed in in the form of free-standing piles, which are connected along the heads by transverse beams, in the longitudinal direction the pile heads are connected by longitudinal struts, and spring dampers are installed on top of the horizontal cross ties at each reference point of the pile, which are located over the entire area of the modular building.

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