No 6 (2015)

Nformation about the reliability and accuracy of the results of numerical simulation of stress waves in solid deformable environment is presented. The task is implemented using the finite element method in displacements. The comparison with results of the analytical solution on the front plane longitudinal elastic wave is made. The studied problem is presented in the form of a half-plane

There is a need of new cost-effective elements of timber structures due to increasing de- mand for individual residential houses. Accordingly, we developed a new design of the com- posite beam with corrugated steel web. Timber flanges with the steel web fit together by the dowel joint, the calculation of which requires clarification by means of the introduction of a design coefficient. The paper presents the main results of an experimental research on thin steel plate-to-timber symmetrical dowel joints. The paper concluded with design coefficients for formulas for determining the bearing capacity of thin steel plate-to-timber dowel joints under short term loads which obtained from results of the experiment

In the article, the questions for calculation of the admissible tensile stresses to appreciate contact strength of spur gears at the unfavorable loading are considered. Calculations the ad- missible tensile stresses for normal, improvement wheels, and for wheels after strengthen sur- face work are specified.The results were confronted to the standards

A stress wave propagation dynamic problem due to impact of elastic bar at a rigid barrier is considered. It is presumed, that the bar is equipped with a dot mass at free end and «sticks» to rigid barrier after impact. The problem is solved with Laplace transformation.

In this paper, the unsteady motion of a cylindrical inclusion with an oscillator in the acoustic medium after the passage of the wave is investigated. The boundary functions and potentials, depending on the time, and also free oscillations of a cylindrical inclusion contain- ing suspended mass situated in acoustic medium are investigated. Eigen-frequencies of oscillations are defined at some values of parameters of the system.

The essence of this mathematical model consist in construction of the basic stress-strain state which is based on a new hypothesis of a vertical element and an additional stress-strain state of the regional flat deformation arising of close rigidly jammed edge. It gives the chance more exactly to estimate the strength of aircraft structures near to irregularities of type of con- nections, join elements (spars) with variation in wall thickness, of the slender swept-delta wings, empennage, and rocket stabilizes. The method of asymptotic integration of the differential equations of a three-dimensional theory of elasticity is applied. By means of special oblique-angled system of the coordinates relationship for the two of fringe problem was derived. The problems of additional, stress- strain state of the frige flat deformation was solved by the variational method of Vlasov- Kantorovich. On the example of the calculation of the beam with constant thickness, it is shown that the considerable contribution to the general stress state is brought by the transverse normal and shearing stresses, which in the classical theory of bars and shells are neglected.

He Journal Structural Mechanics of Engineering Constructions and Buildings is pub- lished after 2005th. The paper contains the information on the history of formation of the jour- nal and on its position between scientific journals of Russia with taking into account different top lists and information of the Russian Index of Scientific Citation.