РАСЧЕТ КОНСТРУКТИВНО НЕЛИНЕЙНЫХ ЖЕЛЕЗОБЕТОННЫХ РАМ ПРИ ИХ ХРУПКОМ РАЗРУШЕНИИ ПО НАКЛОННОМУ СЕЧЕНИЮ

Abstract

A spatial calculation model of a complexly stressed reinforced concrete element is constructed under the combined action of a transverse force and a bending moment. Analytical dependences are obtained for calculating the transverse reinforcement of such an element with inclined (transverse) rods under the stress state under consideration. The rectangular section is reduced to an equivalent box section with two cases of the compressed zone position. The computational model sufficiently fully reflects the physical phenomena of the force resistance of the crossbars of reinforced concrete frames in the limiting and exorbitant states established experimentally. The results of numerical studies of frame structures, the transverse reinforcement of which is accepted in the form of inclined or cross inclined rods when using the proposed and other calculation models, are carried out. A comparative analysis of the results obtained showed the effectiveness of a stricter account of the combined action of bending moments and transverse forces and the possibility of a noticeable reduction in the calculated transverse reinforcement of reinforced concrete structures under the stress state under consideration due to this. The proposed analytical dependences can be used to calculate reinforced concrete crossbars of structurally and physically nonlinear frames with their brittle destruction along an inclined section in exorbitant states.