Reologia płyt żelbetowych pod wpływem pola temperatury

The paper presents an analysis of the magnitude and distribution of internal forces arising in reinforced concrete plates subject to high temperatures and large long-lasting loads. Formulae for orthotropic concrete plate rigidity are derived, creep of the concrete being taken into consideration. Applications of the formulae derived are illustrated on the example of a rectangular plate simply supported on two opposite edges and clamped at the remaining edges. Time-variation of the bending and twisting moments is analyzed at various temperature gradients. Practical recommendations concerning the protection of plates against high temperature influences are given.