Fiber reinforced polymer/plastic (FRP) bar-steel bar composite reinforced ECC-concrete composite T-shaped beam
A composite reinforcement and concrete technology, applied in the direction of joists, girders, truss beams, etc., can solve the problems of low elastic modulus, restricted use, and large deformation of FRP bars
Inactive Publication Date: 2018-07-24
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
However, the disadvantages of FRP bars, such as low elastic modulus and large deformation, restrict their application in concrete structures.
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[0016] The technical solution of the patent of the present invention is further described below in conjunction with the accompanying drawings of the description:
[0017] In order to make full use of the crack control ability of ECC, first calculate the neutral axis position of the T-section beam:
[0018] According to the position of the neutral axis, it is divided into two types, in the flange or at the beam rib. In order to identify which type the T-shaped section belongs to, the analysis is as follows Figure 4 Shown x=h f ′, from the force balance condition and moment balance condition, we can get:
[0019] alpha 1 f c b f 'h f '=f y A s +σ f A f
[0020]
[0021] Where: h 0 =h-a s , a s is the thickness of reinforcement cover, s is the distance between FRP reinforcement and reinforcement, f y is the yield strength of steel bar, A s is the cross-sectional area of the steel bar, σ f is the strength of the FRP tendon, and the assumed compression failur...
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The invention discloses a fiber reinforced polymer / plastic (FRP) bar-steel bar composite reinforced ECC-concrete composite T-shaped beam. The FRP bar-steel bar composite reinforced ECC-concrete composite T-shaped beam comprises ordinary concrete, ECC, FRP bars, steel bars and stirrups. An ECC layer is located in a T-shaped beam tensile zone, and no vibration is required when the ECC layer is cast;the FRP bars are located at the corner of the bottom of the beam, and the advantages such as high strength and corrosion resistance of the FRP bars are used fully; stress longitudinal reinforcementsare longitudinally arranged in the ECC layer along components; and the stirrups are arranged on the lower portion of the ECC layer. ECC materials are used for replacing ordinary concrete in the tensile zone to form the FRP bar-steel bar composite reinforced ECC-concrete composite T-shaped beam; and in order to increase the ECC-concrete interface bonding, a method of arranging transverse grooves inthe ECC layer is provided to enhance the interface bonding. The FRP bar-steel bar composite reinforced ECC-concrete composite T-shaped beam can greatly improve the durability of such T-shaped beams,is used in engineering, and is not only economical but also convenient to construct.
Description
technical field [0001] The patent of the invention relates to FRP bar-steel bar compound reinforced ECC-concrete composite T-beam, which belongs to the technical field of building structures. Background technique [0002] In the traditional reinforced concrete T-beam structure, engineering accidents caused by cracks often occur; the concrete has low tensile strength and is prone to cracks, and once cracked, the crack width will increase rapidly, which accelerates the penetration of harmful substances into the concrete. Corrosion of steel bars leads to deterioration of the structure and reduces the durability of the structure. By controlling the growth of the crack width, it can effectively prevent the internal steel bars from reacting with corrosive substances, thereby reducing the rate of steel bar corrosion and increasing the durability of the structure. [0003] ECC is a fiber-reinforced cement-based composite material that exhibits high ductility characteristics under t...
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Login to View More IPC IPC(8): E04C3/28E04C5/07
CPCE04C3/28E04C5/07Y02A30/30
Inventor 袁方陈利平鲍智雄陈梦成蓝天宇
Owner EAST CHINA JIAOTONG UNIVERSITY