To date, for some elastic systems with a finite number of degrees mass freedom, in which the directions movement are parallel and lie same plane, methods have been developed creating additional generalized targeted constraints kinematic devices. Each constraint increases, each device reduces value only one selected natural frequency to predetermined value, without changing remaining frequencies modes. Earlier, motion parallel, but do not plane (for example, plates), an approach computing...

When designing buildings with reinforced concrete that are planned to resist dynamic loads it is necessary calculate this structural behavior under operational static and emergency impact blast loads. Calculations of the structures shock-wave can be performed by solving equations do not consider Due fact calculation frame a simultaneous load in full 3d settings becomes very non trivial resource consuming problem. This problem split into two tasks. The first one solved using software package...

Abstract The article presents the results of numerical studies stress-strain state models a vertical cylindrical tank with corrosion wear and strengthening wall first ring by an external internal composite tyre. Based on studies, maximum percentage have been determined, dependences influence installation carbon tyre obtained.

The article studies the influence of bending and unbending reinforcing bars on mechanical properties steel bars. This problem is relevant in practice constructing monolithic reinforced concrete structures, since are often subjected to initial bending. question arises about their further use. Based results obtained, a comparative analysis presented for after tensile strength testing with varying bend diameter. According this testing, it possible use these single reverse without reducing steel.

For some elastic systems with a finite number of degrees freedom masses, in which the directions mass movement are parallel, methods have been developed for creating additional constraints, intro-duction each purposefully increases value only one natural frequency to given value, while not changing any other frequencies and modes (forms oscillations). If it is necessary increase values several targeted manner, then this requirement can be implemented by an appropriate separate constraints....

For some elastic systems with a finite number of degrees freedom masses, in which the directions mass movement are parallel, methods have been developed for creating additional constraints, introduction each purposefully increases value only one natural frequency to given value, while not changing any other frequencies and modes (forms oscillations). If it is necessary increase values several targeted manner, then this requirement can be implemented by an appropriate separate constraints....

Rebar coupling connections are widely used for joints, and it is necessary to get information about the stress field distribution on surface at uniaxial tension characterize operation of such joints. Purpose: The aim work study stress-strain state rebar under tension, full-scale junctions type A500 rods, deformation influence steel microstructure grade С1020. Methodology: Non-contact three-dimensional imaging system VIC-3D digital image correlation tracking studying connection; transmission...

Abstract The results of the investigation deformation during axial compression a steel-concrete round column with dimensions 1000×102 mm on testing machine Universal Testing Machine 4500 using digital optical system Vic-3D are presented. patterns evolution strain field distributions surface steel shell obtained. A diagram indicating transition stages elastic strains to inelastic ones is constructed. jump-like dependence Poisson’s ratio longitudinal relative concrete established. This...

The paper presents the results of an in situ investigation evolution deformation fields during compression cylindrical and dumbbell-like steel rods at meso- macroscale levels using digital image correlation method. A different nature distributions localized strain regions on sample surface stages II III was established. It revealed that change patterns correlates with "stress-strain" curves reflects mechanisms.

The deformation behavior under compression of long prismatic steel rods is investigated. Three stages on the curve are identified. Stage I' conditioned upon accommodation process testing machine punches with ends sample. I determined by strength properties steel. It has been found that transition from stage to II takes place at a stress 440 MPa. This I→II loss stability rod compression. A correlation between and distribution patterns fields surface sample established.

The paper studies reinforced concrete principal and secondary trusses of a one-floor industrial building made as precast frame. aim the work is to restore serviceability after instrumental examination with regard detected significant corrosion damage reinforcement longitudinal cracks in protective layer opening width several millimeters. After analysis structural scheme, its stress-strain state simulated MicroFe software, calculation model developed allowing for identified damages structures...

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To date, for some elastic systems with a finite number of degrees mass freedom, in which the directions movement are parallel and lie same plane, methods have been developed creating additional generalized targeted constraints kinematic devices. Each constraint increases, each device reduces value only one selected natural frequency to predetermined value, without changing remaining frequencies modes. Earlier, motion parallel, but do not plane (for example, plates), an approach computing...

To date, for some elastic systems with a finite number of degrees mass freedom, in which the directions movement are parallel and lie same plane, methods have been developed creating additional generalized targeted constraints kinematic devices. Each constraint increases, each device reduces value only one selected natural frequency to predetermined value, without changing remaining frequencies modes. Earlier, motion parallel, but do not plane (for example, plates), an approach computing...

Relevance: Investigation of dynamic parameters is significant for understanding and evaluation the structural behavior performance characteristics. The analysis frequency responses obtained in field observations describes under external loads. A comparison results theoretical calculations gives an idea physical state structure a possibility predicting changing Purpose: aim paper to determine causes vibrations bell-tower Svyato-Voskresenskaya Church its technical condition....

Purpose: The aim of this work is computer simulation the dynamic strength masonry fragment under impact load various intensity and contact angles. Design/methodology/ approach: Numerical calculations are performed on RANET-3 software package allowing 3D impact, explosion powerful radiation using finite element analysis oriented towards solution dynamical problems. Stress states studied in its interacting with weight drop at different time points. Research findings: A mathematical model...

This paper presents in situ investigations of the deformation field distribution during compression cylindrical steel rods at meso and macroscale levels using digital image correlation. The localized areas on surface is studied compressive tests stages II III. It shown that change patterns correlates with stress-strain curves reflects mechanisms. A study dynamic parameters compressed shows increasing stresses a nonlinear increase observed eigen-frequency samples, which curve.

One of the directions further building development and improvement is creation structures with a complex internal structure, i. e. combined sections made various materials operating in single construction. It necessary to search for new engineering methods that take into account behavior such structures. Trigonometric functions ertia moments not only increase efficiency computations, especially resistance, but also provide approaches calculation structure. Objective : The aim this work range...