Abstract
The two-dimensional concrete elements under the action of one-sided central crushing often occurs. For them, the strength problems are solved on the basis of the concrete ideal plasticity theory variational method with application of discontinuous velocities functions. The method takes into account the influence on concrete elements strength the compressive strength and tensile strength of concrete. It also takes the ratio of a sample height to the crushing platform length and friction coefficient between a surface of element and a load punch if it’s necessary. The results of experimental researches were confirmed the assumed in the theoretical solution the kinematical schemes of elements failure. Higher convergence of theoretical strength with tested is received. The calculation sequence of the concrete element under one-sided central crushing is described. The joint calculation of all factors that determine the strength opens the possibility of more accurate assessment and improvement on its basis of structural solutions of concrete elements under the local compressive load.
Highlights
The concrete and reinforced concrete constructions and their elements under the action of a local compression are widely used.According to Eurocode 2, the crushing elements design is made by Baushinger′s empirical relationship in which the ratio of the so-called “rated” area Ac1 to the crushing area Ac0 is assumed as the determining factor
The two-dimensional elements failure character under one-sided central crushing [1] confirms the influence on their strength of concrete axial tensile strength fсt and ratio h / lloc (h – a sample height, lloc – the crushing platform length), not taken into account in Eurocode 2
The reference strength design is not based on consideration of elements limiting stressstrain state (SSS) which is the cause of the above lacks
Summary
The concrete and reinforced concrete constructions and their elements under the action of a local compression are widely used (for example the joints of columns, the end faces of prestressed structures, the horizontal joints of panels of outside walls and floors, walls and supports of bridges in places of beams bearing, girders, lintels). According to Eurocode 2, the crushing elements design is made by Baushinger′s empirical relationship in which the ratio of the so-called “rated” area Ac1 to the crushing area Ac0 is assumed as the determining factor. The two-dimensional elements failure character under one-sided central crushing [1] confirms the influence on their strength of concrete axial tensile strength fсt and ratio h / lloc (h – a sample height, lloc – the crushing platform length), not taken into account in Eurocode 2. Significant experimental material about concrete elements strength at local compression and various factors influence for strength now is saved, the numerous empirical dependences for determination of ultimate load (Table 1) are offered [2]. In our opinion it is necessary to prefer a design method, which would be based on a general basis. A variational method of the concrete ideal plasticity theory is developed in Poltava National Technical Yuriy Kondratyuk University [3] may be such basis
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