THE INFLUENCE ON THE STRESS-STRAIN STATE SANDWICH BEAMS PARAMETERS OF DISCRETE FILLER

The work is devoted to experimental studies of the effect of the size of the faces of the cells of the honeycomb core on the carrying capacity of sandwich beams (TB). Experimental data allow us to determine the influence of the size of the faces of the cells of the honeycomb core on the carrying capacity of sandwich beams consisting of hexagonal honeycomb core and bearing layers United by the glue that is of interest engineering technicians and designers

CALCULATION OF SANDWICH STRUCTURES UNDER DYNAMIC LOAD CONCENTRATED LOAD

Work is devoted to theoretical researches of calculation of the three-layer designs (TLD) at dynamic loading by the concentrated loading. On these theoretical researches graphic and analytical dependences of relative thickness of punching of freely reinforced filler (SAZ) on its density and height of discrete pyramidal filler by which in case of need it is possible to determine the necessary density of SAZ for this speed of hit of the drummer are given

STRESS-DEFORMED STATE OF A STRUT-FRAMED CRANE GIRDER

Objectives. The aim of the present work is to study the influence of design parameters on the stress-deformed state of a sprengel crane girder; to compile the tables and corresponding graphs illustrating changes in internal force factors in the characteristic cross-sections of the system elements under consideration. The article describes the study of the stress-deformed state (SDS) of a metal strut-framed crane girder.Methods. Numerical methods of analysis based on the use of the Green's function are used during solving this problem. A dimensionless parameter is introduced, depending on which the tables and graphs are constructed. According to the known algorithm, the calculations of internal force factors in the sections of the considered construction are performed.Results. Depending on the dimensionless parameter characterising the geometry and physical features of the system, tables of bending moments and transverse forces are compiled. According to these tables, the appropriate graphs are plotted in order to choose easily the optimal design parameters.Conclusion. The dependence of the moments and transverse forces on the dimensionless parameter k was found, the corresponding graphs were plotted and the metal costs for the girders were calculated. The minimum values of the moments and transverse forces are established to take place when the dimensionless parameter k values are close to zero. The most economical was a strut-framed crane girder having k = 0.0001. The most uneconomical had k = 0.05 and k =∞. Eventually, the sprengel girders were found to be more profitable as compared to conventional crane girders. In the examples considered in the article, the metal savings amounted up to 14%. The presented methodology allows the calculation and designing of strut-framed crane girders with two racks to be carried out

RESEARCH OF PARAMETERS PRISMATIC PLACEHOLDER WITH THE STATIC LOADING

The work is devoted to experimental research of parameters of prismatic aggregate at static loading. The data of experimental researches allow to use them in the design of three-layer structures in space, aviation techniques, as well as in construction and machinery that is of interest for technical workers and designers

THE STRESS-STRAIN STATE OF SANDWICH BEAM WITH A HONEYCOMB CORE PYRAMIDAL SHAPE UNDER STATIC LOADING

The work is devoted to theoretical and experimental studies of the stress strain state of sandwich beams with honeycomb pyramidal shape under static loading. These theoretical and experimental studies allow to use them in the design of sandwich structures in the aerospace, aeronautical engineering, as well as in the construction and engineering industry, which is of interest to engineers, technicians and designers

DETERMINATION OF THE OPTIMAL SIZE AND FORM OF HONEYCOMB FOR A SANDWICH AT THE ACTION OF STATIC LOAD

The work is devoted to theoretical investigations of the characteristics of a tetrahedral (square), hex and cylindrical (circular) honeycomb.Evidence of theoretical researches allows to determine the carrying capacity of sandwich beams (TB), square, hexagonal and a cylindrical paper honeycomb and compare beam with any shape and size and has a greater load-bearing capacity, which is of interest technicians and designers

EXPERIMENTAL STUDY OF CARRYING CAPACITY GLULAM BEAMS, REINFORCED SPECIAL WAY

The paper deals a new structural solution of reinforced glued wooden beam and results ofexperimental studies of the bearing capacity of reinforced beams in a special way. We presentthedesign parameters ofprototypebeams, description ofthe experimental setup, results of experimental studies and comparative analysis ofthe stresses anddeflectionsdepending on how the pinching inclined armature

EXPERIMENTAL STUDIES CLEANINIG REINFORCED BEAMS

The purpose of the study was to determine the effectiveness of reinforcement cleaninig beams of metal and plastic fittings. Were conducted theoretical and experimental investigations of stress-strain state cleaninig beams. In the article, in the form of graphic dependences of the research results

THE CALCULATION OF STRESS-STRAIN STATE OF THREE-LAYER BEAM TAKING INTO ACCOUNT EDGE EFFECTS

The work is dedicated to the calculation of the stress-strain state (SSS) of the three-layer beam (TLB) subject to boundary effects.In this paper, a system of differential equations of equilibrium of the threelayer beam. To solve these equations, it is necessary to know the 12 boundary conditions, co-which depend on support conditions and loading of sandwich beams under study. This system of equations is solved by the application package of mathematical modeling "Maple 5.4." The solution of this system we obtain expressions for determining de-formations and stress all components (bearing layers and filler), a three-layer beam anywhere under specified conditions of fastening the ends of the beam and its loading

PROBABLE CALCULATION OF BUILDING SEISMIC RESISTANCE ON KINEMATIC SUPPORT

Objectives. The article reflects the results of the numerical analysis of the earthquake-resistant building on kinematic supports. To this end, the problem is reduced to solving the nonlinear stochastic Cauchy problem. The solution is constructed by the method of successive approximations. The probabilistic characteristics of the oscillation of the building are determined without the use of linearization techniques. An algorithm for solving this problem, which allows to perform numerical experiments on a computer to study the operation of a earthquake-resistant building on kinematic sup-ports, is given.Method. The acceleration of the earth's surface during an earthquake is represented as a non-stationary random Gaussian process. This approach is now generally accepted and beyond doubt. The study of vibrations of the building on kinematic supports under the influence of strong earthquakes is reduced to the solution of the stochastic nonlinear Cauchy equation. This equation is solved by iteration. The acceleration of the earth's surface is a function of three random variables. The required probability is represented as a triple integral, which is calculated using a computer.Result. The basic information about the considered kinematic supports is given. The Cauchy problem is formulated for the case of oscillations of a earthquake-resistant building on kinematic supports under the influence of strong earthquakes. The algorithm allowing to solve this equation is described in detail. The probability of finding the movements of the building within certain limits is represented as a triple integral. The results of numerical experiments carried out on a computer are given. The corresponding graphs are constructed using real accelerograms of strong earthquakes that occurred in the cities of Taft (USA) and Gazli (Uzbekistan).Conclusion. This article describes the method of calculation of earthquake-resistant buildings on kinematic supports, using the data of real strong earthquakes. Based on the results of numerical experiments conducted on a computer, graphs of the reliability of seismic stability of the building in earthquakes. The constructed algorithm and the developed technique can be used in the calculation and design of earthquake-resistant buildings both on conventional supports and on kinematic supports