| Abstract [eng] |
The main purpose of this master's thesis is to create a computational model for determining the stiffness of cracked bent reinforced concrete elements. To achieve this goal four main tasks have been set: 1. literature review - to review the methodology for calculating the deflection of bending cracked elements in accordance with normative documents - Eurocode 2 and Statybos techninis reglamentas; 2. calculation of the curve of the element, taking into account the decrease in stiffness of the cracked area; 3. calculation of the deflection of the bending element, taking into account the cracked sections; 4. to compare the obtained theoretical results with experiments performed by other scientists. After the analysis of the literature, it was noticed that no methodology is provided to calculate the average stresses (only the calculation of the average curves is given), so it was decided to create a calculation model that would evaluate the modulus of elasticity and average curves in different sections of the element. The essence of all this calculation is to find the change in the modulus of elasticity from the ratio of the bending moment to the moment of cracking. This master's thesis describes a calculation model, deriving the main formula for calculating the modulus of elasticity in each section under consideration. It is proposed to divide the element in question into as many sections as possible during the calculation, as this way the real dependence of the modulus of elasticity and the bending moments (E/M) can be seen. Also, after calculating and knowing the deformations of the element, they can be applied to the calculation of the crack width of the element. Number of tables (42 units), number of pictures (41 units), number of literature sources (27 units). |
