The Influence of Temperature and Duration of Heating on the Properties of High-Strength Concrete Modified by Organo-Mineral Components

Korsun, V. I.; Baranov, Aleksey; Khemarak, Khon; Ha, Quynh

doi:10.1007/978-3-030-72404-7_50

Cited by 2 publications

(2 citation statements)

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“…The mechanical properties of concrete under temperature effects, e.g., compressive and tensile strengths, and initial modulus of elasticity, taking into account the prehistory of loading, can be calculated by applying analytical expressions [3]. Temperature shrinkage deformations and creep deformations of medium-strength concretes are calculated for conditions of elevated temperatures using methods addressed in [2,3], and the same values are obtained for modified high-strength concretes using methods described in [20,21].…”

Section: Solution To the Problem Under The Effect Of Temperature And ...mentioning

confidence: 99%

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Nonlinear Deformation Model for Analysis of Temperature Effects on Reinforced Concrete Beam Elements

Korsun,

Morozov,

Tamrazyan

et al. 2023

Buildings

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The results of the study are aimed at developing a nonlinear strain model for reinforced concrete beam elements in the general case of force actions and temperature effects for different durations. As a rule, temperature effects on structures involve temperature drops, causing heterogeneity of mechanical and rheological properties of concrete and reinforcement. The article has approximating expressions needed to take into account the effects of temperature and heating time on the values of temperature-induced strain and mechanical and rheological properties of heavy concretes with C30–C60 strength classes. The properties of concrete and rebars are heterogeneous from top to bottom and across the width of the cross section. A physically nonlinear problem is solved using the method of elastic solutions combined with the method of stepwise increases in temperature and force loading. The cooling of a heated reinforced concrete element to normal temperature is considered a short-term effect. Strength criteria of portions of a concrete cross section, crack closure conditions, and the ability of cracked sections to take loads in compression amid a change in the sign of stresses are determined. The stress–strain state (SSS) analysis of reinforced concrete beams, made according to the proposed method, is compared with the experimental studies using (i) values of thermal bending moments in statically indeterminate structures, (ii) cracking forces, and (iii) values of deformations (elongations and curvatures) of the elements in the longitudinal axis. Good agreement between the calculated and experimental values of controllable criteria confirms the reliability of physical relationships (i) developed for heterogeneous reinforced concrete beam elements and (ii) applied to the complex cases of temperature and force effects.

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Section: Solution To the Problem Under The Effect Of Temperature And ...mentioning

confidence: 99%

“…Characteristics of mechanical and rheological properties of concrete, subjected to high temperatures, depend on a number of factors, such as temperature and time of heating, age of concrete before heating and loading, heating and loading modes, and the scale factor [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%