CN-122014022-A - Concrete foundation beam of composite carbon fiber reinforced material

CN122014022ACN 122014022 ACN122014022 ACN 122014022ACN-122014022-A

Abstract

The invention discloses a concrete foundation beam of a composite carbon fiber reinforced material, and belongs to the technical field of civil engineering structures. The beam comprises a concrete body, a plurality of rows of longitudinal stress steel bar groups, positioning brackets, transverse constraint steel bar combinations, pre-buried anchoring connectors and an external composite carbon fiber reinforced layer, wherein the transverse constraint steel bar combinations are composed of closed main stirrups and Z-shaped additional drawknot ribs, the pre-buried anchoring connectors comprise end metal anchor plates and radial lateral anchor bars, the external composite carbon fiber reinforced layer is formed by pasting a plurality of layers of unidirectional carbon fiber fabric impregnating resins which are longitudinally arranged along the beam, the edges of the bottom, two sides and the top surface of the beam are fully wrapped, the end parts are connected with anchor plates through mechanical pressing sheets in a bolt mode, and longitudinal through reserved pore channels are further formed in the beam and are used for penetrating the prestressed bars or sensor cables. The invention improves the bending and shearing resistance, ductility, durability and multifunctional adaptability of the structure.

Inventors

ZHENG QIYUAN
CHEN ZHUOYI
ZHU SHULIN
FENG QING
TANG JUN
XIE WANG

Assignees

长沙理工大学

Dates

Publication Date: 20260512
Application Date: 20260409

Claims (8)

1. A concrete foundation beam of composite carbon fiber reinforced material, comprising: A concrete body (1); The longitudinal stress steel bar combination (2) comprises an upper longitudinal steel bar group (21) arranged at the upper part of the concrete body (1) and a lower longitudinal steel bar group (22) arranged at the lower part of the concrete body (1), wherein the upper longitudinal steel bar group and the lower longitudinal steel bar group are kept at a fixed distance through a positioning bracket (3); The transverse constraint steel bar combination (4) comprises a main stirrup (41) and additional tie bars (42), wherein the main stirrup (41) is of a closed annular structure and is installed around the longitudinal stressed steel bar combination (2), the additional tie bars (42) are Z-shaped, two ends of each additional tie bar are respectively hooked on non-adjacent steel bars in the longitudinal stressed steel bar combination (2), and the intersection point of the middle part of each additional tie bar and the main stirrup (41) is fixed by spot welding; The embedded anchoring connecting piece (5) comprises an end metal anchor plate (51) and lateral anchor bars (52), wherein the end metal anchor plate (51) is vertically embedded in the end face of the concrete body (1) and is connected with the nearest main stirrup (41) through fillet welds, one end of each lateral anchor bar (52) is welded on the outer side face of the end metal anchor plate (51), and the other end of each lateral anchor bar (52) extends into the concrete body (1) and is connected with at least two longitudinal reinforcing bars through lap welds; The external composite carbon fiber reinforced layer (6) is formed by pasting a plurality of layers of unidirectional carbon fiber fabrics (61) layer by layer through impregnating resin, completely covers the bottom surface, two side surfaces and the edge area of the top surface of the concrete body (1), extends to the surface of the end metal anchor plate (51) at the end area of the beam, is connected with the end metal anchor plate (51) through a mechanical pressing sheet in a bolt mode, and the fiber directions of the carbon fiber fabrics of all layers are parallel to each other and are all arranged along the longitudinal axis direction of the concrete body (1).
2. The composite carbon fiber reinforced concrete foundation beam of claim 1, wherein the upper longitudinal bar set (21) and the lower longitudinal bar set (22) each comprise at least two rows of parallel arranged bars, and the bars in the same row are connected and fixed by transverse distribution bars (23).
3. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein the main stirrups (41) are arranged as encrypted segments in the beam end area, the spacing of the main stirrups (41) in the encrypted segments being smaller than the spacing of the main stirrups (41) in the middle non-encrypted segment.
4. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein the additional tie bars (42) are staggered in cross section, and the spacing between adjacent additional tie bars (42) in the longitudinal direction is not more than twice the spacing of the main stirrups (41).
5. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein the outer side surface of the end metal anchor plate (51) is provided with a plurality of threaded holes, and the mechanical pressing sheet is screwed into the threaded holes after passing through the composite carbon fiber reinforced layer (6) by high-strength bolts.
6. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein the lateral anchor bars (52) are ribbed steel bars, each of the end metal anchor plates (51) is connected with at least four lateral anchor bars (52), and the lateral anchor bars (52) are radially distributed inside the concrete body (1).
7. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein the composite carbon fiber reinforced layer forms a reverse folded wrapping structure at the top surface edge of the concrete body (1) and is bonded with the top surface carbon fiber layer into a whole through a resin glue layer.
8. The concrete foundation beam of composite carbon fiber reinforced material according to claim 1, wherein a reserved pore canal (7) is arranged in the concrete body (1), and the reserved pore canal (7) is longitudinally communicated along the beam for subsequent penetrating of prestressed tendons or monitoring of sensor cables.

Description

Concrete foundation beam of composite carbon fiber reinforced material Technical Field The invention belongs to the technical field of civil engineering structures, and particularly relates to a concrete foundation beam of a composite carbon fiber reinforced material. Background In modern civil engineering, reinforced concrete beams are used as the most basic flexural members in building and bridge structures, and the performance of the reinforced concrete beams is directly related to the safety, durability and service life of the overall structure. The traditional reinforced concrete beam mainly relies on longitudinally stressed steel bars and stirrups which are arranged inside to bear bending moment and shearing force, but under high load, large span or severe environmental conditions, the problems of insufficient bending rigidity, difficult crack control, bearing capacity degradation caused by steel bar corrosion, limited earthquake-resistant ductility and the like are often faced. In order to improve the performance, the engineering world widely adopts reinforcement means such as steel coating, cross section increasing, external prestress or fiber reinforced composite material pasting and the like. However, the existing carbon fiber reinforcement technology generally has the defects of weak end anchoring, easy stripping damage, only local reinforcement, poor overall synergy and the like, and meanwhile, the conventional beam body inner reinforcement framework lacks effective transverse drawknots under the condition of multi-row reinforcement arrangement, and is easy to generate reinforcement scattering and slipping in the stress process, so that the bonding effect with concrete is weakened. For this purpose, we provide a concrete foundation beam of composite carbon fiber reinforced material to solve the above problems. Disclosure of Invention The invention aims to provide a concrete foundation beam of a composite carbon fiber reinforced material, which is characterized in that a plurality of rows of longitudinal stressed steel bars, encrypted stirrups and Z-shaped additional tie bars are optimally configured in a concrete body to form a high-stability framework, and the outer surface of the beam body is fully wrapped with a plurality of layers of carbon fiber fabrics which are longitudinally arranged, so that the technical problems of insufficient bending and shearing resistance bearing capacity, easiness in stripping of carbon fiber reinforcement, poor integrity of the steel reinforcement framework, low durability and the like of the existing reinforced concrete beam under high load or severe environment are solved. In order to solve the technical problems, the invention is realized by the following technical scheme: the invention relates to a concrete foundation beam of composite carbon fiber reinforced material, comprising: a concrete body; The longitudinal stress steel bar combination comprises an upper longitudinal steel bar group arranged at the upper part of the concrete body and a lower longitudinal steel bar group arranged at the lower part of the concrete body, and the upper longitudinal steel bar group and the lower longitudinal steel bar group are kept at a fixed distance through a positioning bracket; the transverse constraint steel bar combination comprises a main stirrup and an additional tie bar, wherein the main stirrup is of a closed annular structure and is installed around the longitudinal stressed steel bar combination; The embedded anchoring connecting piece comprises an end metal anchor plate and lateral anchor bars, wherein the end metal anchor plate is vertically embedded in the end face of the concrete body and is connected with the nearest main stirrup through fillet welds, one end of the lateral anchor bar is welded to the outer side face of the end metal anchor plate, and the other end of the lateral anchor bar extends into the concrete body and is connected with at least two longitudinal steel bars through lap welding; the outer composite carbon fiber reinforced layer is formed by adhering multiple layers of unidirectional carbon fiber fabrics layer by layer through impregnating resin, completely covers the bottom surface, two side surfaces and the edge area of the top surface of the concrete body, extends to the surface of the end metal anchor plate at the end area of the beam, is connected with the end metal anchor plate through a mechanical pressing sheet in a bolt manner, and the fiber directions of the carbon fiber fabrics of the layers are parallel to each other and are all arranged along the longitudinal axis direction of the concrete body. The invention is further arranged that the upper longitudinal steel bar set and the lower longitudinal steel bar set respectively comprise at least two rows of steel bars which are arranged in parallel, and the same rows of steel bars are fixedly connected through transverse distribution bars. The invention is further arranged that