000019771 001__ 19771
000019771 005__ 20170118182335.0
000019771 04107 $$aeng
000019771 046__ $$k2017-01-09
000019771 100__ $$aSheikh, Shamim
000019771 24500 $$aBehaviour of Concrete Columns With Gfrp Circular and Rectilinear Confining Reinforcement

000019771 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019771 260__ $$b
000019771 506__ $$arestricted
000019771 520__ $$2eng$$aGlass Fibre-Reinforced Polymer (GFRP) bars are becoming a feasible alternative to steel bars to produce corrosion-free reinforced concrete structures. In an effort to assess the effectiveness of GFRP spirals and rectilinear ties as internal reinforcement in columns, an extensive research program is underway at the University of Toronto. In the experimental part of the program, fifteen 356 mm diameter full-scale circular columns and sixteen 305 mm x 305 mm cross-section square columns were constructed and tested under constant axial loading and cyclic lateral displacement excursions simulating earthquake load. The test parameters included column shape, types of longitudinal reinforcement (steel and GFRP bars), lateral reinforcement ratio, spacing and configuration of lateral reinforcement, and level of axial load. This paper compares the experimental results from a select group of the circular and the square concrete columns in which steel longitudinal reinforcement was used along with GFRP lateral reinforcement. Results are presented in the form of moment vs. curvature response and shear vs. lateral deflection behaviour. A number of ductility parameters related to curvature, displacement, energy dissipation and drift capacity were used to compare the seismic performance of the circular and square specimens. The drift capacity of the columns at failure was in the range of 2.5% to 3.1% for the columns presented here which satisfy the limitations of North American building codes with circular columns performing better than square columns. Strength degradation before the final collapse at large displacement was minimal for both square and circular columns primarily due to the continuing confinement provided by GFRP lateral reinforcement to the concrete core. Based on the data from the tests, it can be concluded that internal GFRP lateral reinforcement in many cases can provide better confinement and better performance of columns than provided by steel.

000019771 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019771 653__ $$aGFRP; Columns; Seismic, Confinement; Reinforced Concrete

000019771 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019771 720__ $$aSheikh, Shamim$$iKharal, Zahra
000019771 8560_ $$ffischerc@itam.cas.cz
000019771 8564_ $$s516661$$uhttps://invenio.itam.cas.cz/record/19771/files/4357.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4357.
000019771 962__ $$r16048
000019771 980__ $$aPAPER