Experimental Studies of Concrete-Filled Composite Tubes under Axial Short- and Long-Term Loads.

Marcin Abramski,Piotr Korzeniowski,Krzysztof Klempka

doi:10.3390/ma13092080

Abstract

The paper presents experimental studies on axially compressed columns made of concrete-filled glass fiber reinforced polymer (GFRP) tubes. The infill concrete was C30/37 according to Eurocode 2. The investigated composite pipes were characterized by different angles of fiber winding in relation to the longitudinal axis of the element: 20, 55 and 85 degrees. Columns of two lengths, 0.4 m and 2.0 m, were studied. The internal diameter and wall thickness of all the pipes were identical and amounted to 200 mm and 6 mm, respectively. The mean values of two mechanical properties, elasticity modulus and compression strength, were determined. These properties were determined for longitudinal compression and for circumferential tension. The graphs of longitudinal and peripheral deformations of polymer shells as a function of load level are presented both for empty tubes and for concrete-filled ones. The results of long-term investigations of three identically made 0.4 m high concrete-filled GFRP tubes are also presented.

Highlights

IntroductionConcrete-Filled Fiber Reinforced Polymer (FRP) Tubes (CFFT) Column Concept
By limiting the lateral deformations of concrete, the reinforced with glass fibers, which limits the freedom of these elongations, tensile stresses were created composite jacket exerted radial stresses on the concrete, causing a triaxial state of compressive stress which led to the destruction of the shell
Refers to immediate and long-term deformations resulting from creep and shrinkage of concrete. It is a consequence of the columns made of Fiber Reinforced Polymer (FRP) pipes filled with concrete (concrete-filled FRP tubes, (CFFT))influence behave inofa the angle of glass fiber winding on the deformability of the composite

Summary

Introduction

Concrete-Filled Fiber Reinforced Polymer (FRP) Tubes (CFFT) Column Concept. CFFT columns are a modification of CFST (concrete-filled steel tubes) columns commonly used in construction [1,2]. They differ only in the type of material used as reinforcement. The CFST columns consist of a steel casing filled with concrete on the inside. In CFFT columns, a composite pipe is used instead of a steel pipe. The abbreviation CFFT has been adopted in the literature on the subject [3,4,5,6,7]

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Conclusion