Beam of composite structure with corrugated elements

FIELD: construction.

SUBSTANCE: beam comprises compressed and stretched belts and wall. Wall consists of metal sheets perpendicular to planes of belts. Metal sheets have traditional or alternate corrugation on part of length as transverse to longitudinal axis of beam. Cavities formed between metal sheets on sections of intense transverse forces are filled with concrete. Corrugations on these sections remain with section permanent along wall height.

EFFECT: reduced metal intensity and increased bearing capacity of beam.

9 cl, 13 dwg

 

The invention relates to the construction, and more specifically to the joists (with the possibility of execution of the enclosing function) of industrial and civil buildings and structures.

In the prior art (Metal construction. 3 I. Vol. 1. Structural elements: Textbook. for builds. universities / VII, Bouverot, You and others; Ed. by Rev. - 3rd ed., wiped. - M.: Higher. HQ., 2004. - 551 S. S-273, RES) known class of box-shaped metal beams used, as a rule, in cases of significant impact torque. The disadvantage of such designs is the increased intensity due to the appointment of plate thickness of the wall of the terms of tensile shear from the action of transverse forces (usually Primorye areas) and local sustainability. While it is difficult to realize one of the main criteria of optimality beam structures - tonkostennoy cross-sections.

In the prior art (Metal construction. 3 I. Vol. 1. Structural elements: Textbook. for builds. universities / VII, Bouverot, V.V. Filippov and others; Ed. by Rev. - 3rd ed., wiped. - M.: Higher. HQ., 2004 - 551 S. S-298, RES) known metal I-beam cross section with a corrugated wall. The disadvantage of this beam is a high intensity that caused the need for the device Rel is a relatively frequent step of corrugations to provide local and General stability of the wall, and the purpose of the wall thickness of the conditions tensile shear from the maximum shear forces.

The closest analogue of the present invention to the technical essence and the achieved effect is a beam Selivanova N.P. (patent RU 2029040 C1. Published 20.02.1995). The disadvantage of this beam is a high intensity, caused by the need to use the height and thickness of the corrugated sheets to the terms of tensile shear from the maximum shear forces, as well as the relatively frequent step of corrugations to provide local and General stability of the walls. In addition, in this construction, the corrugated walls are interconnected only at the level of zones (there are no intermediate links), which defers certain restrictions on the step and the height of the corrugations of the conditions of stability of the walls and leads to excessive metal on them.

The technical result from the use of the present invention is the reduction of metal beams, increasing the strength and stability (both form and position), which increases their carrying capacity. This technical result is the solution of urgent tasks efficient use of materials in load-bearing building structures and is due to the fact that the wall of the beam consists of several traditionally - or PE the b-corrugated in the transverse direction of the sheets, thus formed between the corrugated plates of the cavity in regions of intense shear forces are filled with concrete. (Under the traditional means corrugation of sheet metal corrugations with a constant pitch and height. Under variable refers to the corrugation of sheet metal corrugations with a variable pitch and/or height in accordance with changes in lateral forces, i.e. in areas of relatively intense shear forces step of corrugations minimal, and their height is the maximum, and in areas of relatively small transverse forces is the reverse situation: a step of corrugations maximum height of the corrugations is minimal). In this case, the slice from the action of transverse forces (usually on primarnych areas) has a cross-section of the wall, consisting of corrugated metal sheets and concrete plot - core. This provides an opportunity to reduce the thickness of the sheet metal wall, the height of the cross section of the beam in the areas of predominance of lateral forces, as well as to reduce the height and increase the pitch corrugations, providing the stability of the wall. In addition, increases the resistance of the structure to the action of the torque and reduces the impact of its own stresses and initial imperfections of the wall and the compressed zone. The weight of the concrete core causes a minor effort in structural elements, since the end of taruas, as a rule, near the supports, creates small bending moments. The features of the proposed design leads to less consumption of metal increases Flexural-torsional rigidity, strength from the action of shear forces, stability of shape and position, and hence the bearing capacity.

The invention is illustrated by drawings, in which:

figure 1 - composite beam structure with alternating corrugated wall and parallel metal belts;

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

figure 3 is a longitudinal section a-A cross section b-B, B-C and D-d of figure 2;

figure 4 - composite beam structure with alternating corrugated wall, the upper zone consists of a metal strip, coupled with concrete flooring (reinforcement of concrete flooring conventionally not shown);

figure 5 - side view of the beam in figure 4 (reinforcement of concrete flooring conventionally not shown);

figure 6 is a longitudinal cross-section A-a, B-B cross section B-b and G-g of figure 5 (reinforcement of concrete flooring conventionally not shown);

figure 7 - cross section d-D figure 6 (reinforcement of concrete flooring conventionally not shown);

on Fig - beam trapezoidal shape, a composite structure with alternating corrugated wall;

figure 9 is a side view of the beam and on Fig;

figure 10 is a longitudinal section a-A cross section b-B, B-C and D-d of figure 9;

figure 11 - beam polygonal shape, a composite structure with alternating corrugated wall, reinforced by a longitudinal rib;

on Fig - side view of the beam figure 11;

on Fig - longitudinal section a-A cross section b-B, B-C and D-G Fig.

Beam composite structure with corrugated elements consists of the compressed zone 1 and elongated belt 2, connected by a wall 3, which consists of a metal sheet 4 and the concrete sections formed by filling a concrete solution cavities in the wall 3 between the sheets 4 in the areas of predominance of lateral forces. Sheets 4 along the entire length or in some areas Gavrilovna transverse (perpendicular to the longitudinal axis of the beam) corrugations 5 and/or 6.

Corrugations 5, 6 on the parts of the wall 3, filled with concrete, remain constant along the height of the wall section 3.

Corrugations 5, 6 can be unilateral or bilateral. The duplex of ribs 5, 6 are preferable because of their symmetry relative to the median plane of the metal sheets 4.

The profile of the corrugations 5, 6 may be different: wavy (sinusoidal, parabolic, ellipsoidal, and the like), triangular, trapezoidal (in the particular case of rectangular). You can change the profile of the corrugations 5, 6 along the length stinky.

The scope of the invention a variant of the beam, which uses the corrugations 5 as extending to both edges of the sheets 4 and not facing, or corrugations 6, leaving only one edge (deaf).

Wall 3 may have a perforation 7, which is preferable to provide in-flight area, where the intensity of the transverse forces, usually small, and the intensity of the bending moments reaches its maximum. Punching device 7 can, in some cases, in addition to reduce the consumption of metal on the wall and to extend the scope of such designs, for example, by laying the through holes communications.

The thickness of the metal sheets 4 of the wall 3, the distance between them and the concrete grade and size of areas filled with concrete, consistent with the terms of the strength of the wall shear and assigned at design-specific conditions. You can use the expanding concrete and is. Thus, the maximum thickness of the metal sheets 4 wall 3 should be provided in areas of intense shear forces (usually Primorye areas), taking into account the power of resistance of the concrete wall elements 3.

At relatively low torques acting on the beam span in part, may wedge in terms of the location of the Fox is s 4 of the wall 3 in relation to each other with a maximum difference in the areas of maximum shear forces and the convergence to the site with a relatively small transverse forces. This design of the beam meets the principle of concentration of material depending on the intensity and nature of existing efforts (in this case, shear forces and bending moments). At a relatively large distance (commensurate with the height of the cross section of the beam) between outer sheets 4 on the support described above, the wedge-shaped arrangement of the sheets 4 can reduce the cross-sectional relationships, rsreplay compressed zone 1 on the support beams out of their plane, or to opt out of such relationships.

A variant of the beam, in which the parts are relatively small shear forces and intense bending moments of the wall 3 is one smooth or corrugated metal sheet 4 with degeneration of the cross-section of the beam at these sites in the h (Fig-13).

Beam composite structure with corrugated elements may have a length of wall transverse ribs 8 and/or longitudinal ribs 9, and the end of the supporting ribs 10.

The concrete mixture (solution) with a reinforcement (if necessary) elements fit into the corresponding cavity between the metal sheets 4 after welding to one of the zones 1 or 2 or pumped through the holes 11 in zone 1 or 2 after welding metal sheets 4 zones 1 and 2.

For the best stepl is of concrete with metal sheets 4 are pressed to have the appropriate notches 12 on sections of the corrugations 5. Notches 12 may be directed along or at an angle to the longitudinal axis of the beam. It is not excluded the possibility of the device ancarola elements 13 in the form of bent rods welded to the sheets 4.

For best collaboration metal sheets 4 wall 3 the arrangement of the tightening bolts 14 and/or transverse apertures 15.

Zone 1 and 2 of the beam of the composite structure with corrugated elements can be parallel or not parallel to each other. In the latter case, the delineation of zones 1 and 2 is a triangular, trapezoidal, polygonal or segmental form.

The compressed zone 1 and / or stretched belt 2 beams composite structure with corrugated elements can be performed with different cross-section.

To further reduce the material intensity of the considered beams may change sections 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 16 and concrete flooring 17 fastened together ankerwyke bolts 18. Possible breakage of the metal element 16 over the area of concrete cores with device rebar cages 19, working on the principle of pins and connecting concrete flooring 17 with the wall 3.

The efficiency of the beam is ompositional structure with corrugated elements is justified by the nature of its work, which is the following:

when uploading beams external load acting on one or two belts 1 and 2 and oriented in the plane of the wall 3, there is a transverse bending of the structure. Transverse forces are taken up almost entirely of composite wall 3, and bending moments - almost entirely zones 1 and 2. Concrete wall sections 3, working in conjunction with corrugated metal sheets 4, significantly increase the stiffness and stability of the entire cross-section in the longitudinal (along the corrugations 5, 6) his direction. This provides an opportunity to reduce the thickness of the metal sheets 4 of the wall 3, to reduce the height and increase the pitch of corrugations 5, 6 (to project flatter and therefore more economical shirring), and in some cases, to refuse the setting of the transverse ribs 8. However, due to the spacing (in plan) of the metal sheets 4 from the longitudinal axis of the beam and better stability of the wall 3 through the joint work with concrete, increased torsional and Flexural-torsional rigidity, stability of its shape and position.

Beam composite structure with corrugated elements made of metals, mainly steel groups of normal and high strength by filling the relevant cavity wall 3 concrete rastvoromety, that bending moments are perceived mainly by zones 1 and 2, it is possible to manufacture from metals with different physical-mechanical properties (in particular bistline solution). The metal sheets 4 of the wall 3 are connected with belts 1 and 2 by means of a continuous, one-sided welds that need to be considered when choosing specific materials weldability criteria and conditions.

Making sheet blanks traditionally required - or-alternating corrugated shape by stamping and pressing of workpieces between two matrices, rolling on core mills, flexible with the help of roll forming machines, as well as a combination of these methods.

The present invention can be used in a constructive system of load-bearing elements of buildings and structures for civil and industrial purposes, intended for use in a variety of snow and wind areas, and in areas with seismic activity up to 9 points.

1. Beam composite structure that contains compressed and / or stretched belt and the wall, wherein the wall is made of sheet metal, perpendicular to the planes of the belt and having at least part of the length transverse to the longitudinal axis of the beam traditional or AC shirring, and formed between metal is istemi cavity in regions of intense shear forces filled with concrete, moreover, the corrugations of these sites remain constant along the height of the wall section.

2. Beam composite structure according to claim 1, characterized in that the outer metal sheets of the walls in the plan are wedge-shaped with respect to each other with a maximum difference in the areas of maximum shear forces and the convergence to the site with a relatively small transverse forces.

3. Beam composite structure according to claim 1 or 2, characterized in that in areas of relatively low shear forces and intense bending moments of the wall represents one smooth or corrugated sheet metal with degeneration of the cross-section of the beam at these sites in the I-beam.

4. Beam composite structure according to claim 3, characterized in that the profile of the corrugations varies along the length of the wall.

5. Beam composite structure 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 composite structure according to claim 5, characterized in that the compressed and / or stretched belts are available with different cross-section and/or from different sets of materials.

7. Beam composite structure according to claim 6, characterized in that the length of the wall provided the setting for reechnyh and/or longitudinal ribs and/or end of the supporting ribs.

8. Beam composite structure according to claim 7, characterized in that the wall has a perforation.

9. The beam of the composite structure of claim 8, wherein the metal sheets have a variable wall thickness along the length of the beam.



 

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