CN-224213636-U - Strip type CFRP (carbon fiber reinforced plastics) cloth hoop concrete beam

Abstract

The utility model discloses a strip-type CFRP cloth hoop concrete beam which comprises CFRP longitudinal ribs, CFRP cloth strips and steel hoops, wherein the CFRP cloth strips are made of carbon fiber cloth and epoxy resin glue, the traditional steel hoops are replaced for helping concrete to resist shearing, the steel hoops are arranged at two ends and three in the span of the beam, only play a role in fixing a steel reinforcement framework, the help of structural stress is small, the CFRP cloth strips are folded three times along the width direction to form a W-shaped section, a self-locking structure is formed by meshing wave crests and wave troughs, and a closed shearing-resistant ring is formed by vertically encircling the outer sides of the longitudinal ribs, so that the CFRP cloth hoop steel reinforcement framework is finally formed. The utility model obviously improves the shear bearing capacity and the corrosion resistance by the cooperation of folding self-locking and epoxy resin to strengthen interface bonding, is suitable for corrosive environments such as ocean engineering, chemical industry plants and the like, and has the advantages of light weight, easy assembly and low maintenance cost.

Inventors

• YUE ZHEN
• WANG ZIJUN
• XU GUANGYOU
• LIN XIANGLONG

Assignees

• 南京工业大学
• 江苏天工建筑科技集团有限公司

Dates

Publication Date

20260508

Application Date

20250605

Claims (5)

1. 1. A strip-type CFRP cloth hoop concrete beam is characterized by comprising a beam body, CFRP longitudinal ribs, CFRP cloth strips and steel hoops; The CFRP longitudinal ribs are continuously arranged along the whole length of the beam body, the beam body comprises a single-layer CFRP longitudinal rib at the top and a double-layer CFRP longitudinal rib at the bottom, and the CFRP longitudinal ribs are respectively arranged in the upper area and the lower area of the beam body; The CFRP cloth strips are vertically arranged in the beam body and are wound on CFRP longitudinal ribs, a closed ring is formed on the same side, the CFRP cloth strips comprise carbon fiber cloth and an epoxy resin layer, and the epoxy resin layer is arranged on the surface of the outermost layer of the carbon fiber cloth; the CFRP cloth strip is folded for three times along the width direction, and the cross section of the CFRP cloth strip forms a W shape; The steel hoop bars are arranged at the two ends and the midspan of the beam body, steel hoop bar at two ends of beam body and the distance from the end part of the beam body is 20-30 mm.
2. 2. The strip CFRP cloth hoop concrete beam of claim 1, wherein the CFRP cloth is aligned and meshed with the wave troughs of the W-shaped wave crests of the cross section of the CFRP cloth at the folded junction of the cloth to form a self-locking structure.
3. 3. The strip CFRP cloth hoop concrete beam of claim 2, wherein the CFRP cloth strip is bonded by epoxy resin glue at the doubling-over junction of the cloth strip.
4. 4. The strip CFRP fabric concrete beam according to claim 3, wherein the CFRP fabric strips are encrypted at the end of the beam body, the spacing is 80-100 mm, and the spacing of the rest areas is 120mm.
5. 5. The strip CFRP steel hoop concrete beam according to claim 4, wherein the steel hoop bars are HPB300 steel bars.

Description

Strip type CFRP (carbon fiber reinforced plastics) cloth hoop concrete beam Technical Field The utility model relates to an internal steel reinforcement framework structure of a concrete beam, belongs to the technical field of constructional engineering, and particularly relates to a self-locking structure formed by adopting CFRP cloth strips to replace common steel bars as stirrups for shearing resistance, folding the CFRP cloth strips into strip-shaped strips with two closed ends and meshing wave crests and wave troughs. Background In a conventional reinforced concrete beam structure, the metal stirrups are easy to corrode when exposed to humid, salt corrosion or chemical erosion environments for a long time, so that the cracking and falling of the concrete surface layer are caused, and the service life of the structure is obviously weakened. Although the FRP composite material is used for manufacturing stirrups to improve corrosion resistance, a specific radian is required to be prefabricated in the forming process, and brittle fracture is caused by stress concentration at the bending part. In the current construction, stirrups need to be manually fixed on site, which not only relates to complex binding procedures and the use of metal binding wires easy to rust, but also greatly improves maintenance cost due to frequent repair after corrosion of later-period metal parts, and restricts sustainable development of building structures. In current engineering practice, CFRP cloth is used for beam body shearing resistance enhancement in a mode of external pasting, a technical scheme that the CFRP cloth in a folded configuration directly replaces built-in reinforcing steel stirrups does not exist, the existing external pasting technology generally adopts a mode of planar layer-by-layer pasting, the optimization design of the shape of the cloth body is lacked, and the utilization rate of materials is reduced. Disclosure of Invention The utility model provides a strip-type CFRP (carbon fiber reinforced plastic) cloth hoop concrete beam, which uses a lightweight high-strength composite material, is bonded by self-locking cooperation with epoxy resin glue at wave crests and wave troughs of CFRP cloth strips, effectively reduces stress concentration at bending positions of the structure, and is particularly suitable for working environments with strong corrosive media in marine engineering, chemical industry buildings and the like. The technical scheme adopted by the utility model is that the strip CFRP (carbon fiber Carbon Fiber Reinforced Plastics) cloth hoop concrete beam comprises a beam body, CFRP longitudinal ribs, CFRP cloth strips and steel hoops; The CFRP longitudinal ribs are continuously arranged along the whole length of the beam body, the beam body comprises a single-layer CFRP longitudinal rib at the top and a double-layer CFRP longitudinal rib at the bottom, and the CFRP longitudinal ribs are respectively arranged in the upper area and the lower area of the beam body; The CFRP cloth strips are vertically arranged in the beam body and are wound on CFRP longitudinal ribs, a closed ring is formed on the same side, the CFRP cloth strips comprise carbon fiber cloth and an epoxy resin layer, and the epoxy resin layer is arranged on the surface of the outermost layer of the carbon fiber cloth; the CFRP cloth strip is folded for three times along the width direction, and the cross section of the CFRP cloth strip forms a W shape; The steel hoop bars are arranged at the two ends and the midspan of the beam body, steel hoop bar at two ends of beam body and the distance from the end part of the beam body is 20-30 mm. Preferably, the W-shaped wave peaks of the cross section of the CFRP cloth strip at the folding junction of the cloth strip are aligned and meshed with wave troughs to form a self-locking structure. Preferably, the CFRP cloth strip is bonded by reinforcing epoxy resin glue at the folding junction of the cloth strip. Preferably, the CFRP cloth strips are encrypted at the end part of the beam body, the spacing is 80-100 mm, and the spacing of the rest areas is 120mm. Preferably, HPB300 steel bars are adopted as the steel hoop bars, but the steel hoop bars only play a role in fixing the CFRP cloth hoop framework and do not participate in structural stress. The utility model has the beneficial effects that: 1. the CFRP strip-shaped material is adopted to replace the traditional stirrup to bear the shearing resistance, and the fiber composite material is adopted as the longitudinal stress reinforcement, so that the dead weight of the structure can be obviously reduced, and the transportation, the assembly and the construction are more convenient. 2. Compared with the traditional reinforced concrete member, the structure effectively improves the shearing resistance and corrosion resistance through the application of the composite material, and can be applied to engineering application under severe working