Abstract
According to the results of experimental studies, empirical dependencies were obtained (obtained from the appropriate mathematical models). The advanced (refined) method of engineering calculation of express-estimation of the strength of sloping cross sections of elements of flexible reinforced concrete structures on the basis of comparative analysis of the obtained empirical dependencies and standard accepted methods in the world was developed (nine basic norms are taken: DSTU B.V.2.6-156:2010 (Ukraine), previously operating SNiP 2.03.01-84*, SNB 5.03.01-02 (Belarus), SR 63.13330.2012 (Russia), Eurocode 2, 2004 (European Union), ACI 318-M14 (USA), AIJ Code, 2007 (Japan), CSA 23.3-04 (Canada), DIN 1045-1 (Germany). The coefficient of variation of bearing capacity and accident ratio according to the results of calculations of standard methods are determined. Their comparative analysis is carried out and informative graphic figures are presented.
Highlights
As research and design experience shows, due to the lack of a unified approach that would take into account the calculation of the inclined and normal sections, especially in complex stress-strain state, the problem of ensuring the strength of inclined sections of span reinforced concrete structures remains unsolved
The express estimation of the strength of sloping cross sections of bending reinforced concrete elements is proposed to be carried out using an advanced engineering method using formulas (1)-(12)
According to the results of experimental studies, the C0 index in practical calculations is recommended to be determined from the empirical dependences (7)-(10) obtained from the appropriate mathematical models: - for ordinary single-span beams: C0
Summary
The construction of a common analysis model that would adequately simulate the stress-strain state and accurately describe the resistance of the structure the effect of the cut in combination with the bending, tensile, compression and torsion, is one of the most difficult tasks in the theory of reinforced concrete. In this regard, in practical calculations of the strength of inclined sections of reinforced concrete elements specialists uses conventional models, the so-called engineering techniques [1-4 etc.].
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