نوع مقاله : پژوهشی
نویسندگان
دانشکده مهندسی عمران، دانشگاه فردوسی مشهد
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Bridges play a significant role in developing the roads and accelerating the
serviceability in normal and emergency situations. The corrosion problem of
steel reinforcing bars in reinforced concrete columns of bridges in humid
environments results in the early deterioration of these structures. Therefore,
it is vital to use the efficient and cost-effective strengthening methods to
increase the serviceability of these structures in critical situations. In this
study, the strengthening of circular reinforced concrete column to foundation
connections with fiber reinforced polymers is investigated. In the experimental
part of the study, four specimens of column-foundation connections were cast
and tested. One specimen was used as the control specimen without strengthening. Two other specimens were strengthened with GFRP reinforcing bars of different sizes. The fourth specimen was strengthened with both of GFRP
reinforcing bars and CFRP sheets. These specimens were under constant axial
compressive load and cyclic lateral displacement, simultaneously. Initial
stiffness, energy dissipation capacity, lateral load capacity and ductility of
the specimens are studied. In order to investigate the ability of the ABAQUS
software, the experimental specimens were simulated in the aforementioned
software. Test results show that the amount of lateral load capacity, initial
stiffness, energy dissipation capacity and ductility increase significantly due
to flexural strengthening of circular reinforced concrete column to foundation
connections with GFRP bars. The highest increase in the amount of the
aforementioned parameters is observed in the specimen strengthened with GFRP
bars and CFRP sheets. The analytical results also show good agreement with the
experimental results. The main difference between the analytical and experimental results is due to the simulation of pinching effect of the experimental results.
کلیدواژهها [English]
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