Abstract
The central one-sided concrete element crushing is considered when the loading platform width is less than the element width (in three-dimensional stress state conditions). A variational method in the concrete plasticity theory, which is developed in the Poltava National Technical Yuri Kondratyuk University, is proposed to calculate the strength. The formula for determining the ultimate load is based on the destruction kinematics, which is observed in the experiments, and takes into account the loading platform size ratio and the element, both concrete strength characteristics, the frictional forces between the support surface and the element. The calculation dependence is rather precise during the cubes central crushing when the element height ratio and the loading platform greater than 4. With other geometric parameters the kinematic scheme changes, which must be taken into account when deriving the formulas for calculating the strength by the variational method. The proposed method allows considering all possible calculation schemes and determining its application limits.
Highlights
In the construction there are large concentrated loads transfer cases to concrete elements
There is a concrete local compression in the structural elements and its destruction probability from punching shear or crushing depending on the geometric dimensions that fall under the relevant design schemes adopted in the standards
It is necessary to switch from empirical dependences to other alternatives dependences, which take into account the stress-strain state and the element kinematic destruction characteristic under crushing
Summary
In the construction there are large concentrated loads transfer cases to concrete elements. It is possible to support the inclined colonnade reinforced concrete columns on the shell and the hyperbolic cooling tower pool wall, multi-story buildings reinforced concrete columns or suspended walls supports on concrete elements of different height and configuration in the plan that are basement part or other buildings structural parts [1] In this case, there is a concrete local compression in the structural elements and its destruction probability from punching shear or crushing depending on the geometric dimensions that fall under the relevant design schemes adopted in the standards. Most of the calculation methods [10] are based on the Bauschinger's formula and its variations, which operate at most two or three significant factors, in particular, the calculated area Ac1 and the compressive concrete strength fcd, at least eight of them This often leads to significant differences between experimental and theoretical results
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