Experimental and analytical studies on concrete-filled triaxially-braided hybrid FRP structures under static loading
By: Jonas, Florian
.
Contributor(s): Soni, Shubham.
Publisher: Thane ACC LTD 2021Edition: Vol.95(1), Jan.Description: 44-57p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete JournalSummary: Fiber-reinforced polymer (FRP) confined concrete composites are increasingly used in building construction and civil engineering for retrofitting, strengthening of concrete compression members, and structural systems in harsh environmental conditions. Whereas a vast number of investigations on the increase in the compression strength of concrete columns through confinement of wound tubes and wrapped FRPs exists, experimental investigations on braided and especially triaxially-braided hybrid FRP tubes for confinement in compression and reinforcement in bending are very limited and hence presented in this paper. The aim of this study is to experimentally investigate the confinement effect and strength increase through a multiaxial stress state in concrete, provided by triaxially-braided confinement hulls with glass (G) and carbon (C) fibers. Therefore, cylindrical test specimens with two different hull thicknesses were mechanically tested under static compression loads. The results of this experimentation help to evaluate the effectiveness of the C-G-FRP confinement hull as a confining material. Furthermore, commonly accepted existing analytical models for the stress-strain behavior of confined concrete, which were developed for non-braided FRP confinement hulls are applied, evaluated, and compared to the experimental results. To determine the material properties of the triaxially-braided C-G-FRP confinement hulls flat coupon tests and split-disk ring tests were conducted. The difference in strength is expressed by an introduced split-disk hoop rupture factor. Lastly, the use of the triaxially-braided C-G-FRP confinement hulls as reinforcement for concrete beams and the influence of the fiber angle are experimentally investigated through a four-point bending test with three different fiber angles.
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2021-2021973 |
Fiber-reinforced polymer (FRP) confined concrete composites are increasingly used in building construction and civil engineering for retrofitting, strengthening of concrete compression members, and structural systems in harsh environmental conditions. Whereas a vast number of investigations on the increase in the compression strength of concrete columns through confinement of wound tubes and wrapped FRPs exists, experimental investigations on braided and especially triaxially-braided hybrid FRP tubes for confinement in compression and reinforcement in bending are very limited and hence presented in this paper. The aim of this study is to experimentally investigate the confinement effect and strength increase through a multiaxial stress state in concrete, provided by triaxially-braided confinement hulls with glass (G) and carbon (C) fibers. Therefore, cylindrical test specimens with two different hull thicknesses were mechanically tested under static compression loads. The results of this experimentation help to evaluate the effectiveness of the C-G-FRP confinement hull as a confining material. Furthermore, commonly accepted existing analytical models for the stress-strain behavior of confined concrete, which were developed for non-braided FRP confinement hulls are applied, evaluated, and compared to the experimental results. To determine the material properties of the triaxially-braided C-G-FRP confinement hulls flat coupon tests and split-disk ring tests were conducted. The difference in strength is expressed by an introduced split-disk hoop rupture factor. Lastly, the use of the triaxially-braided C-G-FRP confinement hulls as reinforcement for concrete beams and the influence of the fiber angle are experimentally investigated through a four-point bending test with three different fiber angles.
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