SU1507943A1 - Multistorey earthquake-proof building - Google Patents

Abstract

The invention relates to multi-story earthquake-resistant buildings. The aim of the invention is to increase earthquake resistance by reducing the amplitudes of the horizontal vibrations of the building and reducing the inertial forces under seismic effects. The lower and upper floors of the building are made flexible and have prestressed connections with tension couplings and vibration limiters. The latter in the lower flexible floor are made of cable, and in the upper flexible floor, in the form of dampers with viscous resistance. Pre-stressed links are placed cross-diagonally between the posts along the internal mutually perpendicular axes of the corner cells. 3 il.

Description

The invention relates to construction and is intended for buildings exposed to dynamic effects, in particular seismic, microseismic, wind.

The aim of the invention is to increase the seismic resistance by reducing the amplitudes of the horizontal oscillations of the building and reducing the inertial forces under seismic effects.

FIG. 1 shows a multistory seismic resistant building; FIG. 2 shows section A-A in FIG. one; FIG. 3 shows a section BB in FIG. one.

A multistory seismic resistant building contains the lower flexible floor 1, placed on the basement plate 2, spatial-rigid floors 3, located on the ceiling 4 of the lower flexible floor 1, the upper flexible floor 5 - on the ceiling 6 of the upper hard floor 3, pillars 7 and 8 respectively, flexible lower 1 and upper 5 floors, prestressed communications of 9 flexible floors 1 and 5, made in the form of metal weights and equipped with tension couplings Yu and limiters I and 12 vibrations, the last of which are made in the lower floor with cable, and in the top floor in the form of dampers with viscous resistance. Fastening wall panels (not shown) to the frame in the upper and lower floors precludes their participation in the work on horizontal loads.

The stiffness of the upper flexible floor 5 is determined from the ratio

sd

about

oo

to

where K is the rigidity of the upper flexible floor 5;

t is the mass of the upper floor 5;

To-period of natural oscillations of the building without the last floor 5.

Connections 9 with flexible limiters 11 and 12 oscillations are set cross-diagonally between posts 7 and 8 along the internal mutually perpendicular axes of the corner cells 13.

Connection 9 with 11 oscillations limiters with one end of an anchor at the top of rack 7, located along the perimeter of the building, in the crossbar, overlap 4 lower flexible floors 1, and the other end of an anchor at the base of rack 7, located in the first row of exterior racks 7 of the building in the basement slab 2. Connections 9 with limiting 12 oscillations with one end of an anchor are at the top of a stand 8 located around the perimeter of the building in the crossbar covering 14 of the upper flexible floor 5 and the other end of an anchor is at the base of a stand 8 located in the first from outdoor p yes racks 8 the building framework, in the crossbar, overlap 6 upper hard floors 5.

The connections 9 to the tension sleeves 10 connect the opposite corners of the cells 13.

This arrangement of the connections makes it possible to control the displacement of hard floors 3 of the covering 14 of the upper floor 5 relative to the center of mass and the center of rigidity and avoids torsion deformation for multi-storey buildings with flexible floors. Tension magnitude in connection with tension couplings 10 is established experimentally by measuring the natural frequencies of a building.

The building's detuning from the prevailing dynamic effect frequencies is made by selecting the appropriate stiffness of the flexible lower floor 5 and by adjusting the tension of the prestressed communication cables with the 9 tension couplings 10.

The setting of the upper flexible floor 5 to the natural frequency of the building is ensured by choosing the appropriate rigidity of the upper floor 5 and selecting the appropriate tension in the pre-stressed connections 9 and ensuring the necessary

Viscous friction coefficient in dampers 11.

The device of the first flexible floor 1 with the lowest possible stiffness provides a vibration-insulating effect, and setting the upper flexible floor 5 to the frequency of the building without the last floor 5 provides damping of vibrations at the resonant frequency of the building, while the lower and upper flexible floors are equipped at the same time

 rigid couplings 9 in the form of prestressed cables with tension couplings 10 and limiters 11 and 12 oscillations to limit the amplitudes of oscillations under narrow band effects, which ensures the output of the system from the resonant mode and reduces seismic load.

Claims (1)

Claims of the Invention Multi-storey seismic-resistant building comprising a foundation slab, spatially rigid floors and two made with racks and ties in the form of flexible floor cables, one of which is placed on the foundation slab, characterized in that in order to increase the seismic stability by reducing amplitudes horizontal oscillations of the building and reduction of inertial forces during seismic effects; another flexible floor is placed on the overlap of the upper rigid floor, and communications in both flexible 0 floors are prestressed, equipped with tensioning couplings and vibration limiters and installed cross-diagonally between the posts along the internal mutually perpendicular axes of the corner cells, while the vibration limiters are made of cable in the lower flexible floor and in the upper flexible floor damper with viscous resistance, and the rigidity of the upper flexible floor is determined from the ratio 0-j, l  about where / (:: stiffness of the upper flexible floor; t is the mass of the upper floor; Then is the period of natural oscillations in a building without the last floor. ten J /five n four / // 3 6 r / J 5-t / t-fig. b