Ponašanje predgotovljenih betonskih greda prednapetih pomoću CFRP užadi

Abstract

Behaviour of precast concrete beams prestressed with CFRP strandsCorrosion presents a serious problem in severe marine environments, especially for bridges. This paper explores the use of carbon fibre reinforced polymer (CFRP) strands for prestressing precast concrete girders. The research includes a practical prestressing process using the prestressing jacks normally applied in the precast industry. Bending tests are made on prestressed concrete T-beams (scaled models of typical T-section). The design and casting processes, and the test set-up used to load the beams up to failure, are discussed, and failure mechanisms are reviewed. Test results are compared with the ACI 318 guidelines. Ponašanje predgotovljenih betonskih greda prednapetih pomoću CFRP užadi Korozija predstavlja ozbiljan problem u otežanim uvjetima morskog okoliša, i to naročito kod mostova. Rad istražuje primjenu užadi izrađenih od polimera armiranog ugljičnim vlaknima (eng. carbon fiber reinforced polymer ili CFRP) za prednapinjanje predgotovljenih betonskih nosača. Istraživanje uključuje proces prednapinjanja pomoću uobičajenih preša koje se koriste u industriji predgotovljenih proizvoda. Provedena su ispitivanja na savijanje na prednapetim betonskim T-nosačima. Analiziran je postupak proračuna, izvedba nosača, postupak ispitivanja do sloma uz razmatranje mehanizma sloma. Rezultati ispitivanja uspoređeni su sa smjernicama ACI 318.

Mechanical behaviour of PVC-CFRP confined concrete column with RC beam joint subjected to axial load

“…Fibre reinforced polymer (FRP) has been widely utilized in engineering repairs due to its good durability, fatigue resistance, convenient structure, and corrosion resistance. Good reinforcing effect of FRP has already been achieved in the repair of members, such as walls, columns, beams, and plates [1][2][3][4][5][6][7][8]. The members strengthened with FRP show good bearing capacity, ductility and seismic resistance.…”