the article considers behaviour of a simply supported pre-cracked beam made of elasto-plastic material. The aim of the work is to study propagation of min-span fractures in the beam, defining of its behaviour in the local area and developing of techniques and methods to prevent further growth of a crack. There were applied vary verify methods to analyse deflections, internal forces and stress intensity factor in the area of crack propagation. Analytical and numerical calculation had been used. For numerical solution ANSYS software is used, based on finite element method. According the solutions key features and conclusions are given.
Keywords: fracture, pre-cracked beam, stress intensity factor, load-bearing capacity, elasto-plastic material, finite element method
The principles of parametric modeling and design based on the example of a buildings is studied, the architectural image of whiches are a set of spiral circular surface with circles of variable radius defined by coordinates through functions of the corresponding surfaces in the SAPPHIRE software. Alternative methods for specifying surfaces in the SAPPHIRE PC with subsequent export to the LIRA PC for engineering calculations of the frame of the building for various combinations of loads by the finite element method are presented. The object of the study is a 130-meter-high building with a hardness core in the form of a cylindrical shell of revolution. One of the most universal ways to create a surface is to specify it through a formula, because you can easily change the shape and appearance of the surface without manually editing the geometry of the model in the drawing. The development of the parametric architecture calls for the creation of new approaches to the calculation of unique buildings and structures, the improvement of software complexes that implement the finite element method, and the appearance of new varieties of finite elements with curvilinear boundaries.
Keywords: parametric architecture, surface, shape of the object, shell, curve, model, geometry, program, formula surface, helical surface
Beams are structural elements subjected to bending loads transverse to their longitudinal axis. For steel beams, which compressed flange is not laterally restrained, checking loss of overall stability is often authoritative in determining their section. In engineering practice are known various approaches to verify the assurance of the steel beam against lateral-torsional buckling. In this article the attention is focused to the methods and their characteristics, described in actual version of the European standard EN1993-1-1.
Keywords: lateral-torsional buckling, steel beams, critical bending force, FEA
The theory of fractals is applicable for creating the real objects and for constructing the independent elements of the framework or the whole structure of the building. Innovative program was developed to research the shaping of the 3D fractal. The object of the study is 3D Mandelbrot fractal. External structures of various powers of 3D fractal were modeled and researched. New terminology has been developed which can be applied to 3D fractals. The power factor shows the ratio of the work of external forces to the total external. The concept of forming 3D fractal can be used in the design of unique buildings and structures.
Keywords: fractal, fractal geometry, Mandelbrot set, volumetric fractal, fractal structure, finite element method.
The article are compared two variants of the frame of a tall building to determine the most optimal model based on the payback period of the investment project. The calculation of economic effect from the outrigger floor frame 24-storey building with underground Parking in the city of Rostov-on-don. Various models of sale of administrative and residential premises are considered and estimated.
Keywords: outrigger floor, high-rise building, investment model, profitability index, payback period, the model of sales
The paper is considered modelling the process elaboration of a pit for high-rise building in the case of dense urban area. The research is analyzed stress strain state of soil with retaning wall. The authors are developed various design solutions of the retainig wall to decrease of displacement of the nodals in soil finite element model. According the results, it has selected rational design solution of retaining wall.
Keywords: dense urban areas, retaining wall, finite element method, stress-strain state, soil massif
The article describes the basic concepts of the three-dimensional analogue of Mandelbrot set and fractal architecture. The ideas of fractal structure shaping in the process of parametric and fractal design are outlined. The algorithm for fractals visualizing in geometric forms is proposed, implemented in the program "3D fractal modeling", developed by the authors. The complex fractal structure of the three-dimensional Mandelbrot fractal is examined layer by layer and compared with the Buddhist mandalas and the architecture of the pagodas.
Keywords: fractal, fractal geometry, Mandelbrot set, volumetric fractal , three-dimensional Mandelbrot fractal modeling, fractal structure,
The paper provides summary the problems of estimating high-rise buildings to a progressive collapse. The analysis of the structure of the technique for calculating the skeleton of the building for a progressive collapse is performed. Recommendations are given on the properties of reinforced concrete carcass elements for emergency actions. An imitation simulation of the emergency response using the finite element method in calculating the building frame for progressive collapse was proposed; Modeling and investigation of the stress-strain state of individual elements of the building's frame for the effect of explosive loading; modeling and investigation of resistance to the progressive collapse of the skeleton of a high-rise building; development of constructive solutions to achieve resistance to progressive collapse.
Keywords: progressive collapse, special action, finite element method, building frame modeling, stress-strain state
In the article there are fundamental laws of digital shaping of the objects included the principles of formation of parametric structures. The main feature of approach is that creation of model is performed by setting of variable characteristics. Construction objects are designed as a unit and change of one parameter causes automatic change of the related attributes and the whole model.
Keywords: digital architecture, parametric design, dynamism, self-organization, continuous and topographical surface, Cassini's equation, mathematical algorithms, scripting method
The simulation of the pulsating component of the wind load on the reinforced concrete skeleton of the building by the finite element method is considered in the article. The calculation of the pulsation component of the wind load was carried out according to the procedure specified in SP20.13330.2011 "Loads and Impacts" and calculation of the pulsating component of the wind load in accordance with the recommendations of CNIISK them. Kucherenko. Based on the results of the calculations, the analysis of the results obtained and conclusions are made.
Keywords: finite element method, design scheme, vibration modes, pulsating component of wind load, building frame
A finite-element model of a high-rise monolithic frame building has been developed, with the calculation of the bearing capacity of the main structural elements in the course of progressive destruction. The influence of introduction of the outrigger floors in the structural scheme is investigated.
Keywords: Finite element model, outrigger floor, progressive destruction, bearing capacity, reinforced concrete, frame, structural element
Разработан вариант рационального проектного решения торгового комплекса «Золотой» в г. Ростове-на-Дону путем замены конструкции покрытия для увеличения шага колонн 2 этажа. Исследование напряженно-деформированного состояние элементов каркаса здания методом конечных элементов. Для оптимизации проектных решений здания торгового комплекса выполнен сравнительный расчет конструктивных схем структурных покрытий типов «Кисловодск» и «БрГТУ». Даны рекомендации по конструктивным решениям покрытия каркаса здания.
Keywords: finite element method, finite element, structural coverage, the design load combination, section, design scheme
The subject of this article is the regulation of stress - strain state in the elements of a structural coating of a unique building of technical Museum. The architectural solution of the object is made in the shape of an airplane, which the fuselage is formed by a vaulted covering with a span of 30 m, and the wings are 38 m consoles. The system of main console trusses and links between them forms the construction of a wing. Several versions of the geometric diagrams of the basic console trusses are proposed. The optimum version of the geometric diagram of construction is selected according to the results of the static calculation. The analysis of the stress-strained state of structural coating with the different variants of the connections between the basic trusses is executed according to the results of calculations for the dynamic loads.
Keywords: the regulation of stress - strain state, geometric diagram, console, structural coating, finite element method, static calculation, dynamic loads
The paper presents a classification of two-dimensional as well as three-dimensional fractals, fractal characteristics, methods for modeling fractals. The algorithm of visualization fractals have used in the "3D simulation of fractals" software for the first time. The points’ generator module unites the points of space into a set of triangular finite elements in the environment of the computing complex SCAD. Complex fractal geometry have transformed into a spatial finite element model of the fractal.
Keywords: fractal, non-Euclidean geometry, fractal characteristics, two-dimensional fractals, three- dimensional fractals, 3D modeling fractal, energy of fractal, iterations of modeling fractals
The article presents the dynamic calculation of hemispherical shells cover the carcass of the building "Winter Garden" Technopark RSSU. Finite element model of the object and the calculation is made in the software package Lira-cad. Flexural-torsional oscillations was produced on the basis of modal analysis. The construction scheme is changed by increasing the hardness of the coating. The scheme receive a new kind of a framework element. Using the findings of the calculations the conclusions were drawn and given recommendations about changing the constructive scheme of the unique building.
Keywords: hemispherical shell , frame , dome, modal analysis , dynamic analysis , the spectrum of frequencies , mode shapes , finite element method