Modeling of Criteria of Reliability of Vibrating Platforms for Compaction of Construction Mixtures

Abstract

The main criteria of vibration reliability of vibration sites of the construction industry are considered. It is proposed that the simplest and most important measure of vibration stress is the maximum value of acceleration a(t), which was measured in absolute values, or in the dimensionless form of its attribution to the acceleration of gravity. One of the quality requirements is the maximum vibration acceleration, which at the points of the system does not exceed the maximum allowable values a(t). As the vibration stress is 10−3 m in the form of a vibration displacement of 20 m/s2, depending on the purpose of the elements of the vibrating machines, restrictions can be imposed on both absolute and relative displacements. Evaluate the magnitude of vibration stresses that occur in its elements, the strength of the system. The quality condition requires that the corresponding maximum stresses (in the case of a complex stress state – some maximum equivalent stresses) do not exceed the permissible values. Taken into account in the number of parameters of the quality of forces and moments occurring in the elements of the system, allows to calculate the bearing capacity of the elements. In any case, the vibration load over time leads to the failure of system elements, this is usually accompanied by the accumulation of relevant damage, so the most accurate approach to assessing the vibration reliability is based on consideration of the process of accumulation of damage.