Wyniki wyszukiwania - BazTech

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3-D finite-difference time-domain modelling of ground penetrating radar for identification of rebars in complex reinforced concrete structures

Lachowicz J., Rucka M.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 4

1228--1240

EN

This paper presents numerical and experimental investigations to identify reinforcing bars using the ground penetrating radar (GPR) method. A novel element of the paper is the inspection of different arrangements of reinforcement bars. Two particular problems, i.e. detection of few adjacent transverse bars and detection of a longitudinal bar located over or under transverse reinforcement, have been raised. An attention was also paid to the influence of few adjacent bars on the estimation of wave velocity in concrete based on the diffraction hyperbola. The GPR simulations were undertaken using the finite-difference time-domain (FDTD) method. The new approach for the numerical modelling of GPR in complex reinforced concrete structures with the use of a 3-D FDTD model was presented. Simulated scans for the 3-D model were compared with results of in situ surveys. The results of investigations showed high usefulness of the 3-D model for the GPR field propagation in structures with a complex system of the reinforcement.

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Łączenie prętów zbrojeniowych metodami spawalniczymi : problemy a kwalifikacje personelu spawalniczego

Węglowski M.

Stal, Metale & Nowe Technologie

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2016

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nr 9-10

46--49

PL

W pracy zwrócono uwagę na metody łączenia prętów zbrojeniowych, zwłaszcza spawalnicze. Wskazano na zakres kontroli jakości, jaką należy prowadzić w trakcie wytwarzania konstrukcji żelbetowej. W drugiej części opracowania przedstawiono wymagania, jakie musi spełniać personel wykonujący i nadzorujący produkcję elementów ze stali zbrojeniowej.

EN

In the paper, the methods, especially the welding ones, of joining reinforcing bars have been presented. The range of quality inspection which should be carried out during the manufacture of reinforced concrete structures has been indicated. The requirements which should be satisfied by the personnel manufacturing reinforced steel elements and supervising such a production have been presented as well.

3

The effect of yield strength on inelastic buckling of reinforcing bars

Korentz J.

Mechanics and Mechanical Engineering

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2010

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Vol. 14, nr 2

247-255

EN

The paper presents the results of numerical analyses of inelastic buckling of reinforcing bars of various geometrical parameters, made of steel of various values of yield strength. The results of the calculations demonstrate that the yield strength of the steel the bars are made of influences considerably the equilibrium path of the compressed bars within the range of post yielding deformations. Comparative diagrams of structural behaviour (loading paths) of thin-walled sections under investigation for different strain rates are presented. Some conclusions and remarks concerning the strain rate influence are derived.

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Analiza wpływu podwyższonych temperatur na własności wytrzymałościowe prętów zbrojeniowych ze stali 18G2-b

Kawałek A., Koczurkiewicz B., Nowosielski Cz.

Hutnik, Wiadomości Hutnicze

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2007

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Vol. 74, nr 6

292-295

PL

W pracy przedstawiono wyniki badań nad wpływem zmian temperatury na własności mechaniczne prętów zbrojeniowych ze stali 18G2-b. Do badań wykorzystano maszynę wytrzymałościową Zwick Z100 wyposażoną w piec oporowy Maytec. Badania prowadzono w zakresie temperatur 20-600 °C stosując czas wygrzewania 30 min. Rejestrowano siłę oraz wartości wydłużeń. Na ich podstawie określono umowną granicę plastyczności i wytrzymałość na rozciąganie badanej stali w funkcji temperatury.

EN

The paper presents the results of investigation into the effect of temperature variations on the mechanical properties of reinforcing bars made of steel 18G2-b. A Zwick Z100 testing machine equipped with a Maytec resistance furnace was used for tests. The tests were conducted in the temperature range of 20-600 °C, while applying a soaking time of 30 min. The force and elongation values were recorded. On their basis, the proof stress and the tensile strength of the steel tested were determined as a function of temperature.