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Strength of eccentrically tensioned reinforced concrete structures with small eccentricities by normal sections

Dmytrenko Yevhen, Yakovenko Ihor, Fesenko Oleg

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2021

Vol. 30, No. 3

424--438

It is implemented the method of normal rectangular sections slab (shell) reinforced concrete elements strength calculating with flat eccentric tensile strength using the deformation m ethod. The results of the calculation are analyzed for the case of eccentric tension with small eccentricities with varying next parameters: the height of the cross section and the reinforcement coefficient. It is investigated the character of diagrams condition change of section “N - εc(1)” at gradual change of the stress-strain state from eccentric to the central tension. It is revealed that when the eccentricity of external forces decreases, the compressed zone of concrete decreases until its complete disappearance, and at rather small values of eccentricities of force application the balance between external and internal forces cannot be found by the method of current norms. An equilibrium is found between internal and external forces only at a two-digit diagram of the distribution of relative longitudinal deformations (in the case of a compressed zone). Variants of the given problem decision without considerable loss of calculations accuracy are offered, the most expedient of which is transition to algorithm of calculation by a method of limiting efforts. It was accepted as the basic in the previous building norms. The results of numerical calculations performed in the software complex “Lira-CAD” and the corresponding mathematical modeling confirmed the rationality and allowable accuracy of further calculations by this method.

Badania nośności belek żelbetowych wzmocnionych pod obciążeniem przez obetonowanie

Blikharskyy Z, Dubizhanskyy D, Khmil R.

Budownictwo i Architektura

2014

Vol. 13, nr 3

65--70

Badano nośność żelbetowych belek zginanych wzmocnionych przez obetonowanie. Przebadano 16 belek zgrupowanych w 4 seriach. Ustalano stan naprężeniowo-odkształceniowy belek w zależności od poziomu obciążenia przy którym realizowano wzmocnienie, a także przyrost nośności wynikający z tego wzmocnienia. Zidentyfikowano trzy charakterystyczne etapy zmian tego stanu. Zaprezentowano wyniki badań nośności wzmocnionych belek i obliczono efektywność wzmocnienia. Ustalono także wpływ stopnia zbrojenia obetonowania na tę efektywność.

Bearing capacity of normal cross section of bending concrete elements reinforced with reinforced concrete ring under load was investigated. Experimental researches of 4 sets of beams with the total number of 16 units were carried out. The results of changes of stress-strain state settings depending on the load level, additional reinforcement, influence of limit level load were analyzed. The three characteristic stages of stress-strain state of reinforced concrete beams strengthened with reinforced concrete ring were defined. Results of experimental investigations of bearing capacity of normal cross section of strengthened beams with reinforced concrete ring under load were presented. Enhancing effect was calculated. According to the results of researches of strengthened beams plots of strain of working armature depending on current bending moment were constructed.