Beam with wall corrugated with asymmetric profile

FIELD: construction.

SUBSTANCE: beam with a wall corrugated with an asymmetric profile comprises a compressed and an extended belt and a wall. The wall at least on some sections is traditionally or alternately corrugated with transverse corrugations. The profile of corrugations is asymmetric relative to the plane stretching via the corrugation top and normal to the longitudinal axis of the beam.

EFFECT: increased bearing capacity of a beam.

10 cl, 8 dwg

 

The invention relates to the construction, the joists, with the ability to perform enclosing functions, and can be applied in industrial and civil buildings and structures.

The prior art I-beam, for EXAMPLE, by Selivanov - Patent RU 2029039 C1. In this beam wall Gavrilovna profile with decreasing toward the bottom (stretched) waist amplitude. A disadvantage of the known designs is the reduction in the overall stability of the wall and the local stability of the individual corrugation due to changes in the height of the wall section of the flute, which stops working as transverse stiffening rib, which is especially important on primarnych sections of the beams. A wall section in the areas of prevalence of bending moments (usually srednepolny section pivotally supported flexible beams) may not fully engaged in the work of bending due to the low stiffness of the wall across the corrugations.

The closest analogue (prototype) of the present invention to the technical essence and the achieved effect is a beam with a variable-corrugated-wall - Patent for useful model №91583. A constructive solution of the prototype corresponds to changes in the intensity of the main effort, resulting in the bending beam - bending moments and shear forces - however, does not implement the full pot is dzielenie opportunities alternating corrugation wall. This fact is justified by the symmetry of the profile (profile) of the corrugations relative to the plane passing through the top of the flute and normal to the longitudinal axis of the beam passing along the largest side of the element.

The technical result from the use of the present invention is to increase the carrying capacity of the beam, first of all, the stability of its walls.

This technical result is the solution of urgent tasks efficient use of materials in load-bearing structural elements. Marked technical result is achieved due to the fact that the wall beams, at least in some areas, traditional or variable Gavrilovna predominantly transverse corrugations profile, asymmetrical with respect to a plane passing through the top of the flute and normal to the longitudinal axis of the banks. Rational placement of corrugations with an asymmetric profile are zones of intense shear forces and/or torques and significant tangential stresses (usually Primorye plots).

While traditional suggested shirring sheet blanks corrugations with a constant pitch and height. Variables are suggested to be considered shirring sheet blanks corrugations with a variable pitch and/or height.

Change the settings of corrugations (the Aga and height) at alternating corrugation wall corresponds to changes in the intensity of transverse forces, bending and torsional moments in the beam areas of relatively intense shear forces and/or torques step of corrugations minimal, and their height is the maximum, and in areas of relatively small transverse forces and/or torques - the reverse situation, the step of corrugations maximum height of the corrugations is minimal.

The asymmetric profile of the corrugations of the wall lies in a shift of the peaks of the corrugations in the direction of increasing intensity shear forces and/or torques. The design solution allows you to place the top of the corrugation, i.e. a fragment of the individual corrugation with longitudinal and torsional stiffness, closer to the maximum (absolute) values of effort on the plot of this flute. The proposed asymmetric geometric shape of the profile of the corrugations of the wall corresponds to the optimal placement of the flute at a given step and the height based on the principle: the greatest stability of the wall at its lowest material consumption.

The invention is illustrated by drawings, in which:

figure 1 - beam with alternating asymmetric corrugated profile wall and parallel zones of sheet material;

figure 2 - side view of the beam in figure 1;

figure 3 is a longitudinal cross-section A-a in figure 2;

figure 4 - beam with asymmetric corrugated profile wall and inserted the additional metal-wooden belts;

Fig, 5 is a longitudinal section of a beam figure 4;

figure 6 - beam with alternating asymmetric corrugated profile wall having a perforation, and with parallel zones, one of which includes concrete flooring;

figure 7 - side view of the beam figure 6;

on Fig - longitudinal section a-a figure 7.

Beam with asymmetric corrugated profile wall consists of compressed zone 1 and elongated belt 2, connected by a wall 3. Wall 3 Gavrilovna predominantly transverse corrugations. An essential factor is the asymmetry of the profile of the corrugations on at least some, most often primarnych, parts of the beam. Shirring wall 3 may be traditional or variables, possible that in some parts of the wall 3 of the corrugations have a constant step height, and the other variable (figure 4, 5).

The corrugations may be unilateral or bilateral relative to the median plane of the wall 3. The duplex of corrugations is preferred due to a more uniform transfer of effort from zones 1 and 2 to the wall 3, the best work on the torsion close match calculated theoretical assumptions real picture of the pair of beam elements and their power of resistance.

The profile of the corrugations may be curved or broken. In some cases, it is possible to consider asymmetry the economic profile as the corresponding deformation wavy, triangular, trapezoidal, or other symmetrical profile. You can change the profile of the corrugations along the length of the wall 3, for example, trapezoidal profile on primarnych parts of the wall, and triangular and/or wavy profile - span section (figure 4, 5).

The scope of the invention a variant of the beam, which uses a flute as facing on both edges of the walls 3 and not facing, or corrugations extending only on one edge (deaf).

Wall 3 to improve local sustainability can have, at least in some areas, mainly pressed and allied with ribbed stiffeners (in fact additional corrugations 4). Additional corrugations 4 can not go to the edges of the wall 3 or leaving at least one edge. Additional corrugations 4 are usually one-sided and symmetric due to the fact that they are effectively done with the help of technology stamping of sheet items.

Wall 3 may have a perforation 5 (6, 7), which is preferable to provide in the area with predominant influence of bending moments on the bearing capacity. Punching device 5 can, in some cases, in addition to reduce the consumption of metal on the wall 3 and to pass communications through design.

The scope of the invention a variant of the beam, in which the phase is x relatively small transverse forces and torques with intense bending moments of the wall 3 is a smooth sheet. The wall section 3 for rational allocation of smooth sheet may be, for example, span the area pivotally supported flexible (especially with the formation of a zone of pure bending) of the beam.

Alternatively, the wall 3, at least in some areas, contains transversely located mainly metal rolling or cold-formed sections open or closed cross-section (Primorye parts of the wall 3, figure 4, 5).

These metal profiles form, as a rule, the peaks of the corrugations and are connected directly with each other or with the intermediate metal plates using a weld, adhesive or rivet connection.

Significant differences of the proposed design from the nearest similar:

- asymmetric profile of the corrugations allows to displace the top of the corrugations predominance of intensive shear forces and shear stresses, in most cases - in the direction of the support;

- the possibility of organizing a gang wall 3, which is formed by the set of rolled or formed sections, interconnected, for example, thin flat plates, which allows to differentiate the thickness of the wall 3 along the length of the beam;

without additional strengthening of the wall 3 to arrange it in a relatively small hole (the size of the holes is not more than 1/3 the height of the wall 3), for example, the R, to skip lines;

to increase the torsional rigidity of the cross section of the beam;

to produce a beam with variable - and traditionally-corrugated wall 3 without specialized goreobsessed equipment;

- the possibility of forming such wall 3, in which local buckling of plates does not design to limit state, but indicates a high level existing in the design effort, i.e. given the opportunity to create a design controlled by changing the shape of the elements of the level of stresses in the wall 3.

Beam with asymmetric corrugated profile wall 3 may have a length of wall 3 transverse stiffening and/or longitudinal ribs, and end support ribs (on the drawings conventionally not shown).

High flexibility of the wall 3 of up to 500 or more, increases the probability of the initial ogiba (geometric imperfections - deviations from idealized form), the negative impact which the most impact in primarnych parts of the wall 3. This circumstance, as well as the fact that the impact of the support reactions close to the self-contained external force causes the need for device support ribs in most cases.

The transverse ribs can join the wall 3 and to the zones 1 and 2, the sludge is only for zones 1 and 2. In the latter case, they are actually racks. Option beams, in which the wall 3 fortified not only by the posts, and braces. Relative to the wall 3 of ribs, struts and braces can be either unilateral or bilateral. Bilateral effective option in the case of the proposed strengthening beams, for example, increasing the operating load.

Zone 1 and 2 beams with asymmetric corrugated profile wall 3 can be parallel or not parallel to each other, representing a triangular, trapezoidal, polygonal or segmental form.

The compressed zone 1 and / or stretched belt 2 beams with asymmetric corrugated profile wall 3 can be performed with different cross-section, and you can change the section of the belts 1 and 2 in length.

The invention provides a variant of the beam, in which the compressed belt 1 is made of several materials: metal element 6 and a reinforced concrete deck 7 fastened together ankerwyke bolts 8 (6, 7).

The cross-section of the beam may be of I-beam, box (double wall 3), h-box (essentially a box with overhangs zones 1 and/or 2).

The nature of the work beams with asymmetric corrugated profile wall 3 is as follows:

when uploading beams by an external load, the action is happening on one or two belts 1 and 2 and oriented in the plane of the wall 3, observed transverse bending of the structure. In the beam there are efforts mainly against transverse forces, bending and torsional moments. Transverse forces are taken up almost completely by the wall 3, and bending moments - almost entirely zones 1 and 2. Effort from torque and perceived zones 1, 2 and wall 3.

If over the beams constructed of reinforced concrete flooring 7, it is included in the compressed work zone I in compression and torsion, allowing you to significantly reduce their consumption. The resistance of the compressed zone 1 is improved in its contiguity to the corrugated sections of the wall 3, for the account based on a notional strip of width equal to the height of the corrugations.

I-beam with asymmetric corrugated profile wall 3 on resistance to torsion (torsional rigidity) occupies an intermediate position between the I-smooth (with transverse ribs) and box beams. Increased resistance to torsion allows you to apply a bending load eccentricities, reaching half the height of the corrugations.

The stability of a beam of plane is provided by releasing her bonds in the form of struts and girders, solid flooring in the form of concrete slabs, profiled or flat sheet metal, etc.

The proposed beam has, as a rule, articulated underlying the s at the ends, although it is possible continuous multi-span scheme beams.

Shirring wall 3, and the device (if necessary) of stiffeners, end (base) of the edges and/or system of braces and/or racks prevents the buckling wall 3. In the case of devices of smooth sections of the wall 3 in areas of intense bending moments these sites are included in work zones 1,2 bending.

Support reaction of the beam is transmitted to the downstream vertical load-bearing elements of the structure (walls, columns, pylons) and then to the foundations.

Beam with asymmetric corrugated profile wall 3 is usually made from metals, mainly steel groups normal or increased strength. Due to the fact that bending moments are perceived mainly by zones 1 and 2, it may be made of metals with different physical-mechanical properties (in particular bistline solution). The wall 3 is connected with the belts 1 and 2 by means of a continuous, single-sided or double-sided welds that requires consideration of indicators weldability and conditions.

Possible metal-to-wood solution zones (figure 4), representing United in a single bearing element wooden beam 9 and the metal profile 10 (bent or rolled). This design decision allows connection of the stand to the wall with 3 zones 1 and 2 with its inserts in the grooves, arranged in a wooden bars 9. The connection beam 9 profile 10 can be implemented using glue, navalnyj elements or bolts (including end-to-end).

In the case of manufacturing a beam of non-metallic materials (plastics, composites and other) compounds of elements of the beam are carried out mainly by means of adhesive solutions.

Traditional or AC shirring possible with the technology of stamping and pressing of workpieces between two matrices, rolling on core mills, flexible roll forming machines, as well as a combination of these methods. Preference should be given to production with a maximum degree of automation that brings the greatest economic benefit. Note that the device of the ribs, the end of support ribs, braces and supports, considerably complicate, and in some cases violates the full automation of the production lines for production of composite structures.

The scope of the invention: structural system of load-bearing elements of buildings and structures for civil and industrial purposes, the present invention can be used in various snow, wind and seismic areas. The proposed design is intended for the perception of static or dynamic environmenta is th. Under dynamic loads it is recommended to make this beam of steel (compressed zone 1 may include concrete flooring 7 - 6, 7), and the connection zones 1 and 2 with the wall 3 to carry out with the help of two continuous welds.

The purpose of the design parameters of concrete beams (profile shape of the corrugations, the step height; cross-section and material of the beam elements, General sizes and so on) based on the work of construction, the complex task on its design and the results of calculations of the bearing capacity and performance. For calculations of the bearing capacity it is recommended to use numerical methods theory of elasticity, in particular, the finite element method (FEM) in the computer implementation.

Feature of the calculations is the view of the fact that the loss of stability of some elements of beams (first wall 3) is very likely in the elastic stage of the work material. Possible case when the loss of load bearing capacity of the beam caused by the loss of local stability of its elements and occurs when the stresses in the elements below the chapel fluidity, and in some cases even below the limit of proportionality elastic-plastic material of the beam elements.

Recommended for stability calculations beams to analyze not only the first form is Oteri sustainability, but the next. In many (but not all) cases valid calculations assuming elastic behaviour of the material of the beam.

When performing computer calculations by the finite element method it is recommended to use for modeling beams shell finite elements with regard to the geometric and material nonlinearities. When this essential criterion of the adequacy of the estimated model is its maximum similarity with the full-scale design as on the geometric characteristics and stiffness parameters.

1. Beam with asymmetric corrugated profile wall containing a compressed and / or stretched belt and the wall, wherein the wall at least in some areas, traditional or variable Gavrilovna predominantly transverse corrugations profile, asymmetrical with respect to a plane passing through the top of the flute and normal to the longitudinal axis of the beam.

2. Beam with asymmetric corrugated profile wall according to claim 1, wherein the wall has at least in some areas, mainly pressed and allied with ribbed stiffeners (in fact additional corrugations), does not extend to the edges of the wall or beyond at least one edge.

3. Beam with asymmetric corrugated profile wall according to claim 1 or 2, atricauda is the, that on sites of relatively small transverse forces and torques, but intense bending moments, the wall is made of smooth sheet.

4. Beam with asymmetric corrugated profile wall according to claim 3, characterized in that the profile of the corrugations varies along the length of the wall.

5. Beam with asymmetric corrugated profile wall according to claim 4, characterized in that the compressed and / or stretched belts are not parallel to each other, with the outline of the zone is a triangular, trapezoidal, polygonal or segmental form.

6. Beam with asymmetric corrugated profile wall according to claim 5, characterized in that the compressed and / or stretched belts are available with different cross-section and/or of different material.

7. Beam with asymmetric corrugated profile wall according to claim 6, characterized in that the wall, at least in some areas, contains transversely located mainly metal rolling or cold-formed sections open or closed cross-section.

8. Beam with asymmetric corrugated profile wall according to claim 7, characterized in that the length of a wall is provided for the production of transverse and/or longitudinal ribs, and/or end of the supporting ribs, and/or a rack system, and/or braces.

9. Beam with asymmetric corrugated profile wall of claim 8, from ecaudata fact, that wall has a perforation.

10. Beam with asymmetric corrugated profile wall according to claim 9, characterized in that the wall thickness along the length of AC.



 

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