A self-stressed concrete composite column confined by frp tubes

Abstract

The invention relates to the technical field of structural engineering and bridge engineering, in particular to a self-stressing-concrete-FRP-pipe-constrained combination column. The self-stressing-concrete-FRP-pipe-constrained combination column comprises an outer FRP pipe and inner self-stressing concrete, the self-stressing concrete is wrapped by the FRP pipe, and self stress is generated in the FRP pipe and the concrete through swelling of the concrete and constraining of FRP. Steel pipes or profile steel are / is placed into the self-stressing concrete and extend / extends from the top to the bottom of the self-stressing concrete, or evenly-distributed longitudinal carrying steel is placed near the periphery of the self-stressing concrete and extends from the top to the bottom of the self-stressing concrete. According to the self-stressing-concrete-FRP-pipe-constrained combination column, prestress can be established in the FRP and the concrete through swelling of the concrete, stress hysteresis of the FRP is avoided, and the high-strength effect of the FRP is sufficiently developed; meanwhile, the concrete is more compact, the mechanical performance of the FRP-constrained concrete column is improved, construction is simple, cost is low, and the self-stressing-concrete-FRP-pipe-constrained combination column can be used for bridges and civil buildings.

Description

technical field [0001] The invention relates to an FRP pipe-constrained self-stressed concrete composite column, which belongs to the technical fields of structural engineering and bridge engineering. Background technique [0002] Fiber Reinforced Polymer (FRP) is more and more used in civil engineering because of its light weight, high strength, corrosion resistance and other advantages. Concrete is a constraint-sensitive material, and lateral constraints can effectively improve the strength and ductility of concrete. FRP-confined concrete columns use FRP to impose lateral constraints on concrete, which can effectively improve the bearing capacity and ductility of concrete columns, and have received a lot of research by domestic and foreign scholars in the past 20 years. However, in FRP-confined concrete columns, the effect of FRP on concrete is a passive constraint, and the confinement effect of FRP can only be exerted after the concrete is compressed and expanded or even...

AI Technical Summary

Problems solved by technology

The hysteresis of FRP confinement undoubtedly limits the function of FRP, and at the same time, the large deformation required to exert the effect of FRP further limits the use of FRP confinement concrete columns

And when self-compacting concrete is used, this phenomenon is exacerbated by the large shrinkage of self-compacting concrete during curing

In order to solve this problem, some people apply prestress to the core concrete by tensioning FRP, but this method is not only complicated in construction, but also the cost of prestressed anchorage and construction is high, which brings certain difficulties to practical application.

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