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| No.12911790
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Information Name: | Zibo carbon fiber reinforced |
Published: | 2014-06-13 |
Validity: | 30000 |
Specifications: | 200/300g |
Quantity: | 1000000.00 |
Price Description: | |
Detailed Product Description: | Reinforced concrete structure Technical Advisory: Chen Gong, Tel: 18121022666 carbon fiber composite reinforced concrete structure technology 1 Introduction Due to the construction of many buildings era structural factors affecting the use of functional changes, technical conditions or natural disasters, etc., appear insufficient carrying capacity. deformation variation, seismic capacity decreased ability to reduce or fatigue phenomena, can not meet the current "Design of Concrete Structures" and "building structures for seismic design" requirements, therefore, need to be reinforced, reinforced. In terms of structural strengthening and reinforcing a lot of research and practice, commonly used in engineering structural reinforcement methods to increase the cross-section method, Outsourcing Steel Reinforcement, prestressing reinforcement method, sticky paste Steel Reinforcement and carbon fiber reinforced composites method. The traditional reinforcement methods overall level is relatively backward, construction methods and construction process is more complex, there is a certain influence on the weight and use of the area structure, and bonding carbon fiber composite reinforcement method has high strength and high efficiency, corrosion resistance, convenient construction, without increasing the structure size etc., in the project has been widely used. 2 fine carbon fiber composite material properties of carbon fiber composites (Carbon Fiber Reinforced Polymer, referred CFRP) reinforced concrete structure technology is a new, highly efficient structural reinforcement techniques. Carbon fiber reinforced concrete structure technology used in the project is the use of resin cements, carbon fiber materials pasted on the surface of the concrete structure in order to achieve the purpose of improving the structure and structural reinforcement force performance. Compared with the traditional method of reinforcement, carbon fiber reinforcement technology has the following excellent performance. (1) high strength and high modulus of elasticity. High-strength carbon fibers, the ultimate tensile strength of steel is about 10 times the elastic modulus of the steel and similar. Thus, in the reinforced concrete structure repair can take full advantage of its high strength, high elastic modulus and ductility characteristics to improve the bearing capacity of concrete structures and components to improve the performance of its force, to achieve the purpose of reinforcement patch. (2) Corrosion resistance and durability. Carbon fiber material is chemically stable, does not react with acids, bases, salts and other chemicals, and thus reinforced concrete structure with carbon fiber reinforced after the good corrosion resistance and durability, chemical corrosion solve other problems encountered in reinforcement methods; also eliminates the sticky rust steel reinforcement required periodic maintenance, saving maintenance costs. (3) thermal expansion coefficient. Thermal expansion coefficient of carbon fiber material is very small, the thermal expansion coefficient in the fiber direction is almost zero, this feature is unmatched by any other material, the thermal expansion coefficient in the vertical direction of the fibers is a relatively large, but other materials with isotropic products minimal compared to another. (4) simple construction, high efficiency. CFRP does not require large-scale construction machinery and heavy equipment, construction occupies less space, no wet work, CFRP flexible, and can be designed according to size with scissors or razor blade to any crop, simple operation, construction speed. According to relevant statistics, paste carbon fiber reinforced steel reinforcement Ergonomics Ergonomics is pasted 4-8 times. (5) ease of construction quality assurance. CFRP is a flexible material, even if the surface of the reinforcing member is not very smooth, after repair, the effective rate can paste more than 95%. (6) the impact on the structure of the small. Light weight carbon fiber material, thin, repaired by reinforcing member, substantially increasing the weight and dimensions of the original structure, does not affect the use of spatial structure. (7) for a wide range. Can be used for different types of structures (such as buildings, structures, bridges, tunnels, culverts, etc.), different structural shapes (such as rectangles, circles, surface structure, etc.), different material components (such as concrete structures, wood, steel, etc. ) reinforcement, can also be used for different parts of the member (such as beams, plates, columns, nodes arch shell, pier, etc.), and the reinforcing elements of different weak. Of particular importance is that for some large civil engineering structures, such as a large bridge piers, beams and bridge decks, tunnels, etc., using the old reinforcement means hardly implemented, and the use of the technology was able to successfully solve reinforcement. In addition, the carbon fiber material there are other advantages, such as through electromagnetic waves, insulation, heat insulation, which makes carbon fiber reinforcement technology to produce good overall efficiency in terms of reinforced concrete structures. 3 Carbon fiber composite reinforced concrete structures in practical engineering, carbon fiber material used to reinforce the main CFRP. CFRP technology in the concrete structure has been more mature, mainly in the following aspects. (1) increase the shear capacity of CFRP contribution to shear stirrups similar role, together with concrete to withstand shear. In addition, the binding effect of CFRP core concrete, and can bear tensile stress and prevent premature reinforcement yield, inhibit the emergence and development of shear cracks. Therefore, CFRP can significantly improve the shear capacity of reinforced concrete structures, and enhance deformability member. The main factors influencing the effect of shear reinforcement has CFRP material properties, width and number of layers, the adhesive quality of CFRP, paste quality, shear span ratio, reinforced by the Dutch case, anchoring methods, such as former members. (2) increase the bending capacity due to the high tensile strength of carbon fiber cloth has features that can be pasted CFRP components in surface tension, so that the concrete tensile stresses shared responsibility to improve the bending capacity of members to reach reinforcement purposes. After pasting CFRP, curved flexural members carrying capacity by significantly improved, effectively inhibited the conduct of cracks, deformation capacity and ductility properties of components has been significantly improved. The main factors affecting the flexural reinforcement effect has CFRP material properties, the width and the CFRP layers, adhesive quality, paste quality, reinforced by the former member of the Netherlands, the longitudinal reinforcement ratio, the member section size. (3) improve the seismic capacity constraints due to the cracking of CFRP components can improve the stiffness of the component and the ability to resist deformation, when the need to improve the seismic capacity of components, can also be used to enhance and toughened CFRP. Especially for reinforced concrete beam-column joints and reinforced concrete columns under axial force, often require seismic design elements. Using CFRP pasted on beam-column joints, or areas of reinforced concrete columns wrapped, can significantly improve the ductility of the structure of concrete structures, increase energy capacity, with good seismic reinforcement effect. At this point, you should consider axial compression ratio, the amount of CFRP, stirrup ratio, slenderness ratio on the CFRP component deformation and seismic performance. (4) improve the ability to withstand fatigue loads or repeated load power components, the design requirements have sufficient fatigue resistance, fatigue resistance of the size of its cross-sectional dimensions, reinforcement ratio, longitudinal reinforcement type and load level and so on. Be reinforced and prestressed concrete beams reinforced concrete beams reinforced with CFRP by 2 million times repeated loads, the reinforcing member will not reduce the strength and stiffness, flaking and brittle fracture phenomenon does not occur. If the form of prestressed CFRP prestressed CFRP exist, so that members of the longitudinal reinforcement stress amplitude decreased, reducing the possibility of fatigue damage. And always in a high state of stress CFRP has good fatigue resistance. Their combined effect so that the reinforcement member fatigue life is greatly improved, has been reduced fatigue deformation, fatigue crack resistance member has been greatly improved, thereby extending the life of components. 4 Conclusion durability of carbon fiber composite material is good, resist acid, alkali corrosion ability, less impact on the original structure, convenient construction, reinforced with other means do not have the advantage. Performed using carbon fiber composites reinforced concrete structures, can effectively improve the carrying capacity of concrete structures, improve the performance of structural deformation, enhance the seismic capacity of the structure, improve the fatigue performance of the structure, integrated reinforcing effect is remarkable. However, the carbon fiber composite reinforced concrete structures are still some technical inadequacies. (1) Carbon fiber is a linear elastic brittle material, and only when there is a greater deformation member to give full play to the performance of their high strength and high elastic modulus. The concrete structure deformation have more stringent control, to a certain extent, limit the ability to play a carbon fiber composite material. (2) CFRP reinforced concrete structure, prone paste debonding of the concrete structure of the reinforcement showed obvious brittle fracture morphology, have an impact on the reliability level of the structure. (3) current carbon fiber composite reinforced concrete structure in the long-term load, impact load that is less research on mechanical properties, the application should have expertise in similar terms. (4) carbon fiber material for reinforced concrete beams, shear and flexural strengthening mechanism and method of calculation has been a pillar of mature research and application of the results, but the carbon fiber reinforced shear walls and other aspects of theoretical studies have compared lacking. (5) when the carbon fiber reinforced composite materials, the use of structural plastic binder as carbon fiber composites and concrete structures, the binder is more sensitive to temperature, so that the mechanical properties of the reinforcing member is greatly influenced by the temperature should be further strengthen the research work of the area. In short, technology has reinforced carbon fiber reinforcement and other traditional methods incomparable superiority and good economic, social and environmental benefits, with the carbon fiber material cost reduction and the deepening of domestic and foreign research, the technology in concrete structures reinforcement applications in the field will be more widespread, and has broad prospects for development. |
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Copyright © GuangDong ICP No. 10089450, Shanghai Jian Lee Construction Co., Ltd. All rights reserved.
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You are the 4787 visitor
Copyright © GuangDong ICP No. 10089450, Shanghai Jian Lee Construction Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility