SU947368A1 - Single-storey metal framework of earthquake-proof production building - Google Patents

Description

(547 SINGLE-FLOOR METAL FRAMEWORK OF SEISMIC RESISTANT PRODUCTION

The invention relates to the construction and can be used in the construction of metal frames of industrial buildings in seismic areas.

The closest to the proposed technical essence and the achieved result is a one-metal metal frame of an industrial building, including roofing trusses, foundations and two-leg cross-section columns, the branches of which are connected to the scaffolds and struts, and the columns are rigidly connected to the foundations and hinged to the trusses of the truss and struts .

However, the known frame is characterized by insufficient seismic resistance due to the absence of structural elements capable of absorbing the energy of seismic effects and metal overruns, since the full bearing capacity in the upper part of the column branches is not used and a factor of 1.5 is introduced when calculating the frame for seismic loads.

The purpose of the invention is to increase the seismic resistance and reduce metal consumption. BUILDING

This goal is achieved by the fact that in a single-storey metal carte, seismic washing production Edani, including roofing trusses, foundations and through two-legged columns, the branches of which are connected by braces and struts, the columns being rigidly connected to the foundations and hinged to the roofing trusses,

To the branches of the upper part of the columns are connected by braces with the formation of a triangular lattice, and the upper part - by struts - the energy absorber, made in the form of channels of variable cross section,

15 the height of which increases symmetrically with respect to the longitudinal axis of the struts from their middle to the ends.

FIG. 1 shows a frame in section; in fig. 2 — node I in FIG. one.

20

The single-storey metal frame of the production earthquake-proof Edan includes the trusses of coating 1, hinged on the through two-leg columns-2, rigidly connected with 25 foundations 3.

Claims (2)

Columns 2 are made of two branches 4 interconnected in the lower part of the columns by diagonals 5, pattern {and и and triangular lattice b, and in the upper part of the columns by struts 7 representing energy absorbers made of variable section channels, the height of which is increases yymmetrically relative to the longitudinal axis of the struts 7 from their core to the end & m. With a horizontal seismic jolt, columns 2 operate as cantilever beams clamped in foundations 1. In this case, the lower parts of the branches 4, combined by braces 5, experience only compressive tensile forces, and these conditions decrease as they move away from the anchorage point with the foundation. The upper sections of the branches 4, united by spacers - energy absorbers 7, experience stresses from tension — compression and additional bending. With wind loads and horizontal seismic, the rated stress in all framework elements is within the elastic work of the steel. When seismic loads of the calculated value in the struts 7, plastic deformations from bending occur, contributing to the absorption of impulse energy. In this case, the branches of the 4 columns 2 in the sections with struts 7 receive additional bending stresses, and since they are underloaded with axial forces at this point, the total-metallic stresses remain within the elastic work of the steel. In order for seismic overloads, the stresses in all frame elements, except for the struts 7, are within the limits of elastic deformations, the frame must have sufficient energy intensity. It is governed by the cross section of the struts 7 and the frequency of their location and the cross section of the branches of 4 columns 2. For this, the running rigidity of faults 7 and branches 4 is prescribed so that the stresses in the branches x 4 columns 2 are 1.2 times less than the stresses in the struts 7. The energy absorption of seismic jolts by the work of pacjiopoK 7 in the plastic stage contributes to the rapid damping of oscillations building This prevents overloads and overvoltages of other frame members. The advantage of the proposed building framework is its increased seismic resistance due to the implementation of column struts in the form of energy absorbers, which makes it possible to calculate the framework structures without a factor of 1.5, which leads to a decrease in metal consumption, and to use standard column designs without introducing special devices into the framework. - energy absorbers. Claims. A single-storey metal frame of an earthquake-resistant production building, including truss trusses, foundations and through two-leg columns, the branches of which are connected by braces and struts, and the columns are rigidly connected to the foundation trunks, characterized in that, in order to increase the seismic resistance and reduce the metal capacity, the branches of the lower part of the columns are connected by braces with the formation of a triangular lattice, and the upper part - by struts-energy absorbers, made in the form of channels of variable cross-section nor, whose height increases symmetrically with respect to the longitudinal axis of the struts from their middle to the ends. Sources of information taken into account during the examination 1. Belen E.I. and others. Metal constructions. M., stroiizdat, 1976, p. 286, 287, p. X.I. f-f