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Effects of stirrup spacing on shear performance of hybrid composite beams produced by pultruded GFRP profile infilled with reinforced concrete

Özkılıç Yasin Onuralp, Gemi Lokman, Madenci Emrah, Aksoylu Ceyhun

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 1

art. no. e36, 2023

Pultruded Glass Fiber-Reinforced Polymer (pultruded GFRP) composite produced by the pultrusion method has become popular in civil engineering applications due to its lightness, corrosion resistance and high strength. However, the use of the pultruded profile combining with reinforced concrete is still limited due to a lack of knowledge. Therefore, the behavior of the pultruded GFRP profile infilled with reinforced concrete beams (hybrid beams) is investigated. This study focused on the effects of stirrup spacing for the hybrid beams. Pursuant to this goal, a total of eight different beams were tested under four-point loading. One reference beam without the pultruded profile and seven hybrid beams having different stirrup spacings were considered. Moreover, the hybrid beams with and without stirrups were wrapped by unidirectional GFRP composite to investigate the effects of stirrup spacing on shear capacity of the beams strengthened by GFRP composite. The experimental findings revealed that tightening stirrups increased the load and energy dissipation capacities of the hybrid beams; however, it could not prevent brittle failure. On the other hand, wrapping hybrid beams with GFRP composite increased the load and energy dissipation capacities and also prevented brittle failure regardless of the presence of the stirrups. Therefore, it is strongly recommended that the unidirectional pultruded profiles should be strengthened with 90° GFRP wrapping to have ductile behavior.

Prosty sposób wyznaczania rozstawu strzemion w belkach żelbetowych

Knauff M., Golubińska A., Knyziak P.

Inżynieria i Budownictwo

2015

R. 71, nr 3

151--153

Przedstawiono prosty sposób projektowania strzemion, który w wielu przypadkach będzie prowadził do korzystniejszych wyników (tzn. do krótszych odcinków zagęszczonego zbrojenia strzemionami) niż zwykłe postępowanie. Sposób ten zapewnia spełnienie wszystkich wymagań normy. Zaproponowano uproszczenia obliczeń (w porównaniu z powszechnie stosowanymi), przedstawiono algorytm i przykłady.

The authors have presented the simple method of designing stirrups, which in many cases will lead to more favorable results (ie. the shorter sections of compacted stirrups) than the usual procedure. This method complies with all requirements of the Eurocode 2. Simplifications are proposed, the algorithm and examples of calculations are included.