FRP-bamboo-concrete combination beam

Abstract

The invention provides an FRP-bamboo-concrete combination beam which is characterized in that the structure comprises a bamboo material (1), an FRP tendon (21) or an FRP fabric (22), concrete (3) and a connecting part (4) which are combined together into the FRP-bamboo-concrete combination beam, wherein the FRP tendon (21) or the FRP fabric (22) is positioned in the cross section of the lower-middle part or positioned at the bottom of the bamboo material (1) to bear tension stress, the concrete (3) is positioned at the top or on the two sides of the middle-upper part of the bamboo material (1) to bear compression stress, and the concrete (3) is tightly connected with the bamboo material (1) by the connecting part (4). By making full use of the characteristics of the three materials, the invention greatly improves the sectional inertia moment of the original bamboo beam, thereby effectively improving the rigidity of the original bamboo beam member. The combination beam has the advantages of light weight, high bearing capacity, high rigidity, good torsional resistance, good ductility, high self recovery capability and the like, and can be used as the bending member in the field of a civil construction structure.

Description

technical field [0001] The invention relates to a bamboo beam component, in particular to a composite beam component composed of bamboo and other materials, and belongs to the field of civil building structures. Background technique [0002] Under the current background of developing low-carbon economy, green, ecological, environmental protection and low-carbon new building structural materials are the inevitable direction of civil engineering technology development. The biggest advantage of bamboo is green environmental protection and renewable raw materials. Bamboo has a high strength-to-weight ratio, which can reach 3 to 6 times that of steel, far better than concrete and other materials. Bamboo has strong deformation ability and high strength. Relatively, better elasticity and toughness, the bamboo structure building system built with bamboo engineering materials has been applied in practice. The bamboo structure has the advantages of fast construction speed, easy standa...

AI Technical Summary

Problems solved by technology

[0003] The elastic modulus of bamboo is low, and the design of bamboo beams as bending members is controlled by the stiffness of the section. According to the deflection limit (GB50005-2003 "Code for Design of Timber Structures", the deflection limit of beams and grids is L / 250) The ultimate bearing capacity checked is about 20% to 30% of the ultimate bearing capacity checked according to the strength, resulting in lower strength utilization of the material, larger section design, and poor economy; The impact of the reduction is relatively large, resulting in discrete actual mechanical properties, often due to early failure due to local defects in the tension zone; the typical characteristics of the failure mode of bamboo beams are that the bamboo fibers in the bottom tension zone reach the ultimate tensile strain, the failure mode is relatively brittle, and the failure process Shorter, inconsistent with ductility requirements of structural members

[0004] In view of the lack of mechanical properties of bamboo engineering materials, it is necessary to seek technical measures for improvement and enhancement in order to improve its applicability to engineering structures. For example, Chinese Patent No. "02120518.3" discloses a "manufacturing method of recombined bamboo plywood". The bamboo plywood manufactured by this method has improved strength and utilization rate, but its modulus of elasticity has not been improved substantially; as Chinese Patent No. "200520010970.6", a "a kind of bamboo fiberglass composite beam column" is disclosed. Moso bamboo is filled with a glass fiber resin layer after being filled to strengthen the moso bamboo, improve its life and save materials, but this technology is aimed at the original bamboo of moso bamboo, which is difficult to adapt to the requirements of modern engineering structures; another example is Chinese Patent No. "02277578.1" , discloses a "a new type of bamboo fiber plastic composite board", which provides a composite board in which a metal mesh layer or a glass fiber mesh layer is placed between the interlayer layers of the bamboo fiber board, but this technology mainly focuses on the strength of the board. The improvement of the section stiffness is very limited by the metal mesh layer or the glass fiber mesh layer

[0005] In a word, currently known technology still can not solve the existing problems of bamboo girder application

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