High-strength reinforcement built-in ultra high performance concrete (UHPC) beam member

Abstract

The invention provides a high-strength reinforcement built-in ultra high performance concrete (UHPC) beam member, which is particularly suitable for the field of beam members with high-rise, heavy load and long span structures. The member comprises UHPC and a reinforcement cage which is poured inside and is formed by high-strength reinforcement and common reinforcement. The beam member has the following advantages: the advantages of the UHPC and the high-strength reinforcement are fully utilized, thus effectively reducing the section of the member, improving the ductility of the member and enlarging the available space while saving materials and energy; and the beam member dispenses with application of prestress, has simple construction process, is suitable for prefabrication production, improves the construction speed and is beneficial to popularization and application of the two materials in the engineering and research and development of novel materials.

Description

technical field [0001] The invention is an ultra-high-performance concrete beam member with built-in high-strength steel bars, and is especially suitable for the field of high-rise, heavy-load, and long-span reinforced concrete beam members. Background technique [0002] Ultra High Performance Concrete (UHPC for short), also known as Reactive Powder Concrete (RPC for short), is based on the theory of maximum compactness, removes coarse aggregate, and improves the fineness and Active, and mixed with steel fibers, strict preparation and construction techniques are adopted to minimize the defects (pores and micro-cracks) inside the material, with ultra-high strength, high toughness, high durability, high crack resistance and volume A new cement-based composite material with good stability. The compressive strength of ultra-high performance concrete is 3-15 times that of high-strength concrete, the tensile strength is 4-6 times that of high-strength concrete, the ultimate tensi...

AI Technical Summary

Problems solved by technology

[0004] Ordinary reinforced concrete beams have the following defects when facing high-rise, heavy-load, and long-span structures: due to the low strength of concrete and steel bars, in high-rise, long-span structures, the load is relatively large, and only by increasing the beam section size and The method of reinforcing the reinforcement increases its bearing capacity, which not only causes a great loss of materials, increases the construction cost and construction difficulty, but also severely compresses the available space due to the large cross-section; It has been cracked, and the crack appears in the form of a wide main crack. If the crack is too large, the stiffness of the beam will be reduced, the deflection will be too large, and the durability will be reduced. The service life is greatly reduced

[0005] Although prestressed reinforced concrete beams can partly avoid the above defects, because the compressive strength of ordinary concrete and high-performance concrete is still not high enough, the cross-section is still too large when facing high-rise and long-span structures, and the application of prestress increases the construction difficulty and construction cost; although the above-mentioned defects can be avoided by using ultra-high performance concrete beams with prestressed steel bars, there are still problems of high construction difficulty and high construction cost

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