Utjecaji orijentacije slojeva CFRP traka na ojačanje šupljih čeličnih elemenata

Abstract

This paper studies the effects of orientation of CFRP (carbon fibre reinforced polymer) strip layers on the improvement of bearing capacity of strengthened steel-made circular hollow elements. The four point bending test was conducted, and elements were subjected to bending until failure. The improvement of bearing capacity of strengthened tubular steel elements is presented in terms of failure load, stiffness, composite beam action, and modes of failure. Beams strengthened with CFRP strips with two longitudinal layers and one layer along the periphery performed better than the beams reinforced with one longitudinal layer and two layers along the periphery. Utjecaji orijentacije slojeva CFRP traka na ojačanje šupljih čeličnih elemenata U ovom se radu proučavaju utjecaji orijentacije slojeva CFRP traka (polimera ojačanih ugljičnim vlaknima) na poboljšanje nosivosti ojačanih čeličnih kružnih šupljih elemenata. Provedeno je ispitivanje savijanjem uz djelovanje sila u četiri točke, a elementi su opterećeni na savijanje do sloma. Poboljšanje nosivosti ojačanih cijevnih čeličnih elemenata analizirano je s obzirom na silu otkazivanja, krutost, kompozitno djelovanje i vrstu sloma. Nosači armirani CFRP trakama s dva uzdužna sloja i jednim po obodu pokazuju bolje ponašanje od nosača armiranih s jednim uzdužnim slojem i dva sloja po obodu.

Seismic vulnerability assessment of CFRP strengthened RC structures

“…Extensive work in both the experimental and analytical areas has been conducted on both full scale RC frames and smallscale plain concrete specimens of circular and non-circular cross-sections confined with FRP and subjected to pure axial compressive loading [6][7][8][9][10]. The effect of CFRP strengthening on hollow steel members has also been studied by Kabir et al [11]. Studies focusing on RC columns of both circular and non-circular cross-sections of considerable size (minimum dimension cross-section of about 300 mm [12]) have also been conducted [12][13][14][15][16][17]; however, these researches were focused on the effect of confinement on structural behaviour, while insignificant research has been done on Earthquake Risk Assessment (ERA).…”