RU182930U1 - COMPOSITE CONCRETE BEAM - Google Patents

Abstract

Composite concrete beam refers to construction, namely to composite concrete structures such as trusses or beams, into which composite reinforcement is introduced to absorb tensile forces.

A composite concrete beam, including a concrete body, a longitudinal rod working and transverse rod reinforcement, additionally equipped with transverse reinforcing elements installed in the span of the structure to the reinforcement height with a step corresponding to the calculated crack spacing, and the longitudinal rod working, transverse rod horizontal and transverse rod vertical reinforcement made from a composite in the cross section in the form of an oval, the long axis of which is combined with the maximum loads on the beam, Ichin axes of the oval rod composite reinforcement performed in proportion with the calculated loads along the axes of the beam in cross-section in the middle of the length.

The technical result of the claimed solution is to increase the load-bearing capacity of the beam by using oval-shaped composite reinforcement of the beam with the oval axes of the composite reinforcement rod in proportion to the calculated loads along the axes of the beam in the cross section in the middle of the length. tab. one.

Description

Composite concrete beam refers to construction, namely to composite concrete structures such as trusses or beams, into which composite reinforcement is introduced to absorb tensile forces.

A reinforced concrete building element is known (Patent RU No. 2188916 IPC E04C 3/20 (2000.01). Published on 04/10/2002 Bull. No. 25), made in the form of a reinforced concrete bending structure (crossbar) like a truss or beam, in which tensile forces are perceived metal reinforcement is introduced; bent sheet perforated reinforcement of closed box section with perforated sheet insert located diagonally along the trajectory of the main tensile stress is located in the supporting sections of the crossbar. The closed form of sheet reinforcement creates a cage effect for concrete, increasing its strength. The sheet insert not only perceives tensile forces, but also ensures the stability of the side surfaces of the sheet reinforcement to buckle out of the plane and increases the torsional stiffness of the supporting sections.

The known device has an insufficient bearing capacity of the beam.

A device is known Composite concrete strut for power line supports (Patent RU No. 178875 IPC Е04Н 12/12 Published: 04/20/2018 Bull. No. 11), containing the main volume of concrete, prestressed working reinforcement, a spiral attached to working reinforcement at the ends of the rack and in places changes in the pitch of the spiral, mounting and embedded loops, and the working reinforcement is made of high-strength composite reinforcement, which has an oval shape in cross section, the reinforcement is installed with the long axis of the oval coinciding with the long axis of the cross section Nia beams.

The known device has an insufficient bearing capacity of the beam.

The closest in technical essence to the claimed utility model is a reinforced concrete building element made in the form of a reinforced concrete building element such as trusses or beams, including a concrete body, longitudinal rod working and transverse rod reinforcement, equipped with thin transverse metal plates installed in the span of the structure to the height of reinforcement with a step corresponding to the calculated crack spacing. (Patent RU No. 67603 IPC E04C 3/00 (2006.01). Published: 10.27.2007 Bull. No. 30)

The disadvantage of this device is the insufficient bearing capacity of the beam.

The technical result of the claimed solution is to increase the load-bearing capacity of the beam by using oval-shaped composite reinforcement of the beam with the values of the oval axis of the composite reinforcement rod in proportion to the calculated axial loads.

The present technical result is achieved by a composite-concrete beam, including a concrete body, a longitudinal rod working and transverse rod reinforcement, additionally equipped with transverse reinforcing elements installed in the span of the structure to the reinforcement height with a step corresponding to the design crack pitch, and the longitudinal rod working, transverse rod horizontal and transverse vertical bar reinforcement made of a composite in cross section in the form of an oval, the long axis of which is It is placed with maximum loads on the beam, the values of the axis of the oval of the rod of the composite reinforcement are performed in proportion to the calculated loads on the axes of the beam in a cross section in the middle of the length.

The increase in the load-bearing capacity of the beam consists in the fact that with a change in the geometric shape of the reinforcement with the same area and with the same material, the load-bearing capacity in the direction of the long axis of the oval will increase, which is combined with the maximum load on the beam, and this means that the reliability of the structure will increase .

The increase in the load-bearing capacity of the beam is also determined to the optimal ratio of the oval axis values to greater or lesser in the spatial positioning of the composite reinforcement in power loads.

The table shows the relationship between the ratio of the values of the axes of the oval and the moments of resistance in the form of an oval of a bridge bull with curves according to [4].

The moments of resistance along the axes of the maximum load, an oval with a different ratio of the major axis to the smaller and with an area equal to the cross-sectional area of the circle of 14 mm, increase (see table). Moments of resistance along the axis of the minimum load, in similar conditions, are reduced. The total resistance moments on both axes increase slightly.

The operation of the composite beam device.

The calculated loads along the axes of the cross section in the middle of the length of the beam determine the values of the axes of the oval of the rod of the composite reinforcement. The reinforcing cage of a composite concrete building beam is formed as follows. The longitudinal rod working reinforcement is connected with the transverse rod horizontal reinforcement and the transverse rod vertical reinforcement with a spatial arrangement of oval forms of reinforcement for maximum load. The fittings are connected with viscous plastic clamps. Cross composite reinforcement is performed by horizontal and vertical reinforcing bars representing the connection of the sides of the rectangle with each other and longitudinal longitudinal working reinforcement with an oval cross-sectional shape. A composite beam with two support points along the edges carries a load along the entire length with a maximum in the middle. In the middle of the beam, a central transverse reinforcement is installed with a rectangle with the location of the long axes of the oval parallel to the longitudinal bar working reinforcement. Subsequent transverse reinforced rectangles are installed with a nonlinear increase in the distance from one another to the edges of the beam.

The finished composite frame is placed in the formwork and concreted.

Thus, the specified technical result is achieved in that the composite reinforcement is made in the form of an oval, the long axis of which is combined with the maximum loads on the beam and the axes of the oval core of the composite reinforcement are made in proportion to the calculated loads along the axes of the cross section in the middle of the length of the beam, in total these signs increase its bearing capacity.

Information sources

1. Patent RU No. 2188916 IPC E04C 3/20 (2000.01). Published on April 10, 2002 No. 25;

2. Patent RU No. 178875 IPC Е04Н 12/12 Published: 04/20/2018 Bull. No. 11;

3. Patent RU No. 67603 IPC E04C 3/00 (2006.01). Published: 10/27/2007 Bull. No. 30.

4. Reference on the resistance of materials / Pisarenko G.S., Yakovlev A.P., Matveev V.V .; open ed. Pisarenko G.S. - 2nd ed., Revised. and add. - Kiev: Science, Dumka, 1988 .-- 736 p. (58, 74 p.).

Claims (1)

A composite concrete beam, including a concrete body, a longitudinal rod working and transverse rod reinforcement, additionally equipped with transverse reinforcing elements installed in the span of the structure to the reinforcement height with a step corresponding to the calculated crack pitch, differs in that the longitudinal rod is working, the transverse rod is horizontal and the transverse rod vertical reinforcement made of composite in cross section in the form of an oval, the long axis of which is combined with maximum loads on the beam, the values of the axes of the oval of the rod of the composite reinforcement are performed in proportion to the calculated loads along the axes of the beam in a cross section in the middle of the length.