Hollow column member with built-in high tensile steel bars and pipes for confinement of ultra high performance concrete

Abstract

The invention provides a hollow column member with built-in high tensile steel bars and pipes for a confinement of ultra high performance concrete, especially being suitable for the field of pier column member of high rise, heavy load and longspan structures. The member comprises a reinforcement cage consisting of outer steel pipes, longitudinal high tensile steel bars and stirrups, and hollow ultra high performance concrete poured on the internal surface of the outer steel pipes wrapping the reinforcement cage. The invention fully utilizes the advantages of the ultra high performance concrete, the high tensile steel bars, and the hoop confinement of the outer steel pipes, effectively reduces the cross section of the member, improves the bearing capacity and stretch ability of the member, so that the member has good earthquake resistant behavior, the materials are saved and the available space is increased at the same time. According to the invention, prestress is not needed, the construction technology is simple, and the construction speed is improved. The member is suitable for the precasting production, is good for application of the two high tensile materials in projects, and meets the design concepts of energy saving, environmental protection and new style.

Description

technical field [0001] The invention is an ultra-high-performance concrete hollow column member constrained by built-in high-strength steel pipes, and is especially suitable for the field of pier column members of high-rise, heavy-load, and long-span structures. Background technique [0002] Ultra High Performance Concrete (UHPC for short), also known as Reactive Powder Concrete (RPC for short). Due to its different preparation and construction techniques, its mechanical properties and deformation capacity are significantly better than ordinary concrete and high-strength concrete, including removing coarse aggregate based on the theory of maximum compactness, increasing the fineness and activity of components, so as to minimize Small material internal defects; adding steel fibers to increase toughness; using high-efficiency water reducing agent to reduce water-binder ratio and porosity; high-temperature curing to promote the hydration speed and degree of hydration of cementi...

AI Technical Summary

Problems solved by technology

However, the concrete-filled steel tube column still has the following problems. The strength of ordinary steel bars and concrete used is still insufficient, and the cross-sectional area of ​​the member is still too large when the load is large, and its light weight and high strength performance still need to be further improved.

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