Title: Improving Methods of Evaluating the Crack Resistance of Concrete Structures

Author(s): Nikolay N. Trekin, Emil N. Kodysh, Aleksander N. Mamin, Dmitry N. Trekin, and Justine Onana

Publication: Symposium Paper

Volume: 326

Issue:

Appears on pages(s): 93.1-93.6

Keywords: crack resistance of bending elements, nonlinear deformation model, stress-strain diagram

DOI: 10.14359/51711076

Date: 8/10/2018

Abstract:
The paper presents comparison of design values of crack-resistance of bending reinforced members under normal performance conditions and under high technological temperatures up to 2000С [4000F] calculated according to existing regulatory documents as well as on the basis of nonlinear deformation model with the use of bilinear diagram of concrete state with data derived from tests that served as the basis for empirical formulas in SNiP 2.03.01-84* (construction rules and regulations) and SNiP 2.03.04-84. Efficient area where these formulas can be applied is restricted by the parametric data of the studied structures. Numerical research revealed understatement of crack-resistance in existing standards which occurs because of underestimation of plastoelastic section modulus. The obtained results were used to develop recommendations aimed at correction of the calculation method for determining crack formation moment including the case when simplified bilinear diagram of concrete state is applied.