RU181315U1 - REINFORCED CONCRETE BEAM - Google Patents

Abstract

Reinforced concrete beam refers to construction, namely to reinforced concrete bending structures (girders) such as trusses or beams, into which steel reinforcement is introduced to absorb tensile forces. reinforcing elements installed in the span of the structure to the height of reinforcement with a step corresponding to the estimated crack spacing, and the longitudinal rod working, transverse rod horizontal and transverse rod vertical steel reinforcement is made in the cross section in the form of an oval, the long axis of which is combined with the maximum loads on the beam. The technical result of the claimed solution is to increase the bearing capacity of the beam.

Description

Reinforced concrete beam refers to construction, namely to reinforced concrete bending structures (crossbars) such as trusses or beams, into which steel 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.

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 prototype is the lack of bearing capacity of the beam.

The technical result of the claimed solution is to increase the bearing capacity of the beam, by replacing the contour of the cross section of the steel reinforcement of the round beam to an oval.

The present technical result is achieved by a reinforced concrete beam, including a concrete body, a longitudinal rod working and transverse rod steel reinforcement, additionally equipped with transverse metal 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 bar vertical steel reinforcement made in cross section in the form of an oval, long whose axis is combined with the maximum loads on the beam.

The principle of reliability of reinforcement is that with a change in the geometric shape of reinforcement with the same area and with the same material, the bearing capacity in a certain direction will increase, and therefore, the reliability of the structure will increase.

The moment of resistance along the axis of the maximum load, an oval with a ratio of the major axis to less than 1.61 and with an area equal to the cross-sectional area of the circle 16 mm, increased 1.829 times, i.e. by 82.9%. The moment of resistance along the axis of the minimum load, under similar conditions, decreased to 0.843 times or -15.6%. The total moments of resistance along both axes increased by 1.326 times, i.e. by + 32.6%.

The operation of the device reinforced concrete beams.

The metal frame of a reinforced 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 connection of the reinforcement is performed by welding or knitting wire. The transverse metal reinforcement with 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 shape in cross section. A reinforced concrete 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 metal frame is placed in the formwork and concreted.

Thus, the specified technical result is achieved by the fact that the reinforcement is made in the form of an oval, the long axis of which is combined with maximum loads on the beam increases 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. 67603 IPC E04C 3/00 (2006.01). Published: 10/27/2007 Bull. No. 30.

Claims (1)

Reinforced concrete beam, including a concrete body, a longitudinal rod working and transverse rod steel reinforcement, additionally equipped with transverse metal reinforcing elements installed in the span of the structure to a reinforcement height with a step corresponding to the design crack pitch, characterized in that the longitudinal rod is working, transverse rod horizontal and transverse bar vertical steel reinforcement made in cross section in the form of an oval, the long axis of which is aligned with maxi low loads on the beam.