Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
    “Scientific Herald” of Voronezh State University of Architecture...
Journal "Scientific Israel- Technological Advantages"
“Scientific Herald” of Voronezh State University of Architecture and...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
Journal "Scientific Israel- Technological Advantages"
         “Scientific Herald” of Voronezh State University of Archite...
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MivneCAD En Journal

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Journal "Scientific Israel- Technological Advantages"
“Scientific Herald” of Voronezh State University of Architecture and Civil Engineering,
Vol.11, № 2, 2009
MODERN PROBLEMS OF THE COMPUTER-AIDED DESIGN
OF BUILDING STUCTURES

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MivneCAD En Journal

  1. 1. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 MODERN PROBLEMS OF THE COMPUTER-AIDED DESIGN OF BUILDING STUCTURES E. Voiczek1 , V. Babaev 1 , E. Melamed 1, D.Beilin2 CUBUS-Engineering Software Israel eliezer@cubus.co.il Polumate Lyd.-INRC, Migdal HaEmek, Israel bdima@bezeqint.net ABSTRACT The paper presents the basic modules of the new computer complex of calculation and design of building structures MIVNECAD integrated into AutoCAD media. MIVNECAD allows to define the stress-strain state of a structure at static and dynamic loading and to realize a number of the main designing functions Keywords: Building structures, Software, AutoCAD, Finite Elements Method INTRODUCTION Design technology of building structure (BS) underwent dramatic transformation over the last 20 as a result of universal graphic facilities focused on personal computers. Specialized graphic programs (AutoCAD, IntelliCAD, ADT, Revit) have quickly won a leading place in the design technology, therefore software designers are forced to consider specificity of these graphic complexes for creation of the competitive products. It should be noted that in the second half of last century the universal calculation tool “Finite Element Method” (FEM) was created, thereby need to develop the special methods and algorithms of the specific BS calculation is no longer required. Thus, the basic accent of BS designing was displaced: from calculation of elements and nodes to their graphic representation (structural drawings). This concept forms the basis of the new computer design-calculation complex Mivne CAD . MIVNECAD presents а system of calculation based on FEM and designing of BS in the AutoCAD media. It allows to define the stress-strain state of structure at static and dynamic loading and to realize the main design functions (Figure 1) . Figure 1. Home page of MIVNECAD 129
  2. 2. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 INFORMATION MEDIA “PROJECT” The system of the functional software modules connected by the uniform information media Project is put in the MIVNECAD basis. Project contains the full information on the structural scheme and the calculation model, which forms, presents and stores in internal formats of the MIVNECAD complex (block Data Base). Each new problem has the name. It is significant that of the structural scheme and calculation model of BS are organized in the AutoCAD media. Standard software tools of AutoCADа and specially developed procedure Drawing Construction are used at formation of input data. As this takes place the special fail “DWG” is created and exported to Data Base of MIVNECAD (Figure.2) Figure 2. Example of the created .dwg. file for following export to Data Base The thickness of walls, the sizes of columns, overall dimensions of floors is defined automatically from the .dwg drawing. The section of beams, a thickness of floor plates and values of permanent and temporary loads are presented in the corresponding places of the drawing. The sizes of the coordinate grid FEM , numbers of nods , elements and their type are appointed automatically with possibility of updating in accordance with requirements of a solved problem (Figure 3). A distinguished feature of the calculation model is appointment of Base Point on the plans of each floor as these plans can be presented in various coordinates. Routine program MIVNECAD automatically constructs a 3D view of a designed building (Figure 4). The 3D view is used for an estimation of the image of each floor (Figure 5) Functional modules Functional modules of MIVNECAD realized in AutoCAD media are divided into four groups: • Input modules : provide input of the source information in an interactive graphic mode and the graphic analysis of the calculation results . 130
  3. 3. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 • Calculation modules: provide static and dynamic calculations, calculation of structural design force combination. Worst load combination, main and equivalent stresses and reactions. • Documentation modules: provide documentation of the calculation results. • Projecting modules: provide selection a reinforcement and design of reinforcement concrete structural elements Figure 3. Chart of coordinate grid of FEM. Example ..The modular structure generates the MIVNECAD configuration which as much as possible meets the requirements for each user The user interface of interaction with system, the input data control and the analysis of results is completely unified, that provides minimum time for mastering of the complex and logical sequence of the operations performance. The highly extensive system Styles (Figure.6) is developed for simplification of the source data input. The processor and library of the finite elements The high-efficiency processor allows solving of the static and dynamic problems with the degrees of freedom data bulk. The algorithm "Skyscraper" [3] was taken as the mathematical based algorithm of solution of FEM equation systems. It allows to solve the extending systems with consecutive connection of the new blocks (in the given MIVNECAD complex we mean the consecutive connection of floors).The monitoring system of the input data carries out check of the design scheme and fixes all found out errors, for example: load assemblage from the top floors on bottom. At the correct calculation the loading diagram is close to a triangle (Figure 7). The library of finite elements contains a universal bar element with six degrees of freedom in each node and a rectangular element of a plane shell with five degrees of freedom in each node. These elements can be used together with the elastic foundation Use of the developed system of absolutely rigid inserts and hinges [4] allows to approximate boundary conditions of the roof slabs and floor slab panel with satisfactory accuracy. Design for vertical loading includes define the force values quantity and diameter of a reinforcement in all elements of a building: plates, beams, walls and columns (Figures 8,9) 131
  4. 4. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Figure 4. 3D image of the designed multistory building Design of building structures for seismic and wind loadings Quality and reliability of the analysis results depend on the chosen dynamic model. The accepted dynamic model provides: • Distribution of rigidities in a building; • Distribution of masses; • Seismic action on a building The model is constructed on the basis of a set of assumptions: • Floor slab panel is represented as absolutely rigid body in the its plane and flexible out of the plane for transfer of shear forces on vertical structural elements; • Groups of structural elements (walls, columns etc.) are replaced with an equivalent bar located in «the centre of masses»; rigidity indexes of the bar correspond to rigidity of the replaced elements • Use of “substructures” 132
  5. 5. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Figure 5 3D image of the designed floor Seismic activity on building included in the dynamic model is based on the following assumptions and hypotheses: • The approximate static method [5] • The approached dynamic method [5] The model allows to perform the analysis which most close depicts properties of the designed building Dynamic analysis of a building is based on the FEM (Figure 10) According to this method, the distributed masses are replaced with the concentrated masses in finite number of points. At each stage of software work the obtained of results is examined on conformity with standards [5.-7] Graphic preprocessor As note above the primary goal of the software MIVNECAD is its full integration with the popular graphic complex AutoCAD, for use in full its soft hardware Complex MIVNECAD possesses wide scale of expedients for formation and updating of design model geometry , such as : • creation of the structural model based on prototypes of structure, • copying of the model fragments, • assemblage of analytic model from subsystems and groups, • various functions of geometrical transformations 133
  6. 6. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Figure 6 System Styles for the source data input . Figure 7. Vertical loads assemblage (example) 134
  7. 7. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Figure 8 Image and graphs of the stress state of a floor slab Figure 9 Scheme of reinforcement’s location 135
  8. 8. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Figure 10 Analysis results and diagrams of normal forces, moments and shearing forces along height of the building . All key parameters of the model, including geometrical characteristics of beam sections, static and dynamic loads etc. are given by in a graphic dialogue mode .The interface of preprocessor is approximated maximum to creation and updating technology of design model and features of the information processing The set of facilities for geometry modification of an analytical model includes various kinds of the geometrical transformations, allowing to change scale of the model or the indicated fragment, to carry out its turn round the specified axis, to obtain mirror image, to transfer a model’s part on the specified distance etc. These functions give the chance to create the design model practically any complexity 136
  9. 9. Journal "Scientific Israel- Technological Advantages" “Scientific Herald” of Voronezh State University of Architecture and Civil Engineering, Vol.11, № 2, 2009 Graphic postprocessor Use of AutoCAD’s recourses for large design models allows to simplify the analysis of results In parallel with analytical results graphical tool of MIVNECAD allows to display epures (for bar systems) or isofields (for floor plates and roof slabs) of forces, displacements and deflections. Analytical block of a reinforcement selection in reinforced concrete structural elements makes possible to obtain the reinforcement area in the prescribe direction, width of cracks opening, percent of reinforcing etc. By this means the form of the results representation becomes usual for an engineer and creates for him additional comfort. Any graphic information can be printed Documentation of analysis results The module of documentation of the analysis results allows provides to generate input data and results tables with in a text format, and to export them in MS Word or MS Excel. Formation of the tables is carried out according with the types of load-bearing structures; the tables allow to add comments and to include the graphic information. Thus, the report document can be edited by AutoCAD’s aid , to get the convenient form for the user (for example according to the standard accepted in his company) and export in MS Word or MS Excel for non-standard processing of results with reference to specific conditions. ACKNOWLEDGEMENT The authors thank Prof. Sh, Frostig, Dr. A.Grossman, Eng. A.Naginsky, Sh. Wogman, E. Besnovaty, L. Sandler, A.Plotkin for their helpful comments to improve the quality of the software REFERENCES 1. STRAP engineering software for the structural, civil and bridge engineering- Israel, 2007. 2. LIRA-Windows , Software, NIIASS, Ukraine, Kiev,-1996 3. N.N. Shaposhnikov, V.B. Babaev, G.B. Poltorakj, E.G. Petrushev, SPRINT, Software MIIT, Moscow, 1985 4. E.Melamed ,Computational modeling of interaction of reinforced concrete structural elements, DVGUPS, Khabarovsk, 1966 5. Standard 413 Design provisions for earthquake rsistance of structures SI-413 Israel, 2004 6. Standard 414, Characteristic Loads in Buildings: Wind Load, IS 414, 1982 7. Standard 466, Concrete Code: General Principles IS 466, 1987, 137

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