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Experimental investigation of full-scale concrete columns confined by high-strength transverse reinforcement subjected to lateral cyclic loadin

Hou Chongchi, Zheng Wenzhong, Li Sheng, Wu Xiaohao

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 4

250--267

EN

The use of high-strength longitudinal and transverse reinforcements in confined concrete columns can improve bearing capacity and deformability. Besides, experiments on confined concrete columns with side length of 400 mm can better reflect the behaviour of confined concrete columns in engineering project. Thus, the purpose of this study is to investigate the seismic behaviour of full-scale confined concrete columns with high-strength longitudinal and transverse reinforcements. Based on 15 confined concrete columns subjected to lateral cyclic loading, the effects of axial compression ratio, shear span ratio and volumetric ratio on the seismic behaviour of confined concrete columns were studied. The results showed that the ultimate drift ratios of the 15 confined concrete columns ranged from 1/43 to 1/20, i.e. 1.2–2.5 times as much as the specified limit (1/50) of rate earthquake, indicating excellent ductility. Additionally, the high-strength transverse reinforcements could not yield at peak load but could yield at the ultimate displacement. The high-strength transverse reinforcement stresses at the peak lateral load were 430–690 MPa, approximately 56–91% of the transverse reinforcement yield strength. Finally, an empirical formula was proposed to predict the ductility factor that was then evaluated by comparing the predicted values with the experimental results of 37 confined concrete columns.

2

Rheological properties of LMz 58-2 brass in hot rolling conditions

Galkin A.M., Kawałek A., Kiselev O.A., Ozhmegov K.V.

Hutnik, Wiadomości Hutnicze

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2010

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Vol. 77, nr 5

212-214

EN

Hot torsion plastometric tests of the LMz 58-2 brass samples were performed in the temperature range of 600 to 800 °C at a strain rate of 0.1 to 10.0 s-1. The obtained results were used for optimization of hot reversal rolling regimes in industrial conditions.

PL

Przeprowadzono badania plastometryczne brązu LMz 58-2 w warunkach skręcania na gorąco w zakresie temperatur 600÷800 °C przy prędkości odkształcenia 0,1÷10 s-1. Uzyskane wyniki zastosowano do optymalizacji schematów odkształcenia podczas walcowania nawrotnego na gorąco w warunkach przemysłowych.

3

Plastometric test of zirconium alloy of system Zr-Nb

Dyja H., Galkin A.M., Knapiński M., Ozhmegov K.V.

Hutnik, Wiadomości Hutnicze

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2010

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Vol. 77, nr 5

207-209

EN

AbstractThe plastometric test of attempts for stretching alloy of system Zr – Nb samples were performed by straining in the temperature range of 650÷950 °C at a strain rate of 0.1÷2.5 s-1. The obtained results will be used for optimization processes of receiving semi-finished products in the conditions of hot deformation.

PL

Badania plastometryczne krzywych umocnienia próbek ze stopu Zr – Nb przeprowadzono odkształcając je w temperaturze 650÷950 °C przy prędkości odkształcenia 0,1÷2,5 s-1. Uzyskane wyniki wykorzystano do optymalizacji procesu produkcji półwyrobów w warunkach odkształcania na gorąco.