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ATECO TANK TECHNOLOGIES ENGINEERING SERVICE CO.
ALUMINIUM GEODESIC DOME ROOF
DESIGN PHASES
FRAME MODELLING ( GEOMETRICAL MODELLING )
STRUCTURAL ANALYSIS ( FRAME LOADING AND DATAINPUT )
DESIGN CHECK ( RESULTS AND EVALUATION )
REPORTING ( PRINTOUT )
3D MODELLING ( THREE DIMENSIONAL REALISTIC MODELLING )
ASSEMBLY AND SHOP DRAWING
Support Modules
WIND AND SNOW CALCULATION
SEISMIC LOAD CALCULATION
CROSS-SECTION OPRIMISATION
TANK SHELL BUCKLING CALCULATION
JAN. 2014
ATECO TANK ENGINEERING DEPARTMENT
www.atecotank.com
ATECO TANK GEODESIC DOME ROOF DESIGN PHASES
ATECO DOME FRAME MODELLING
ADFM is intended as a serious design tool for architects, engineers, and designers of geodesic structures including domes. It can also be very useful for others interested in studying the many fascinating aspects of geodesic design. ADFM is NOT a cookbook for building geodesic domes nor does it perform, or confirm, the structural integrity of any design. Our ADFM application is very well suited for structural analysis of geodesic structures with many features included especially for this purpose.
ADFM is a design utility that can generate a wide variety of geodesic and spherical (or ellipsoidal) 3D (wire frame and surface models) for import to CAD or finite element analysis applications and for generating detail design data for the members that make up the structure. In addition to generating its own structures, it can import custom text files of spherical points and element created in other applications to take advantage of the many geometric analysis features in ADFM.
ADFM can produce tables of hubs, struts, and panels grouped into like types with detail geometric information. The like-types of hubs, panels, and/or struts can be highlighted on the structural display. Design drawings of hubs and panels can be output as clean DXF files suitable for import to CAD or structural analysis applications. ADFM is
compatible the structural analysis application as well as with many CAD drawing programs.
ADFM is not only a practical design tool but is an educational tool as well. It supports all major types of geodesic layouts (breakdown methods) for the icosahedron, octahedron, and tetrahedron for both Class I and II with special features for studying single face layouts. ADFM is the only geodesic generator application that supports all three standard breakdown methods for both geodesic class I and II for all the polyhedrons as discussed in the popular geodesic texts.
GENERAL DATA ( Example )
CONFIGURATION
Spheric Zenith Z Radius 46,3303 Rings 10 Sectors 8,0000 Shifted rings 4 Number of nodes 362 HUBS Number of hubs 361 Number of types 26 PANELS
Number of panels 672 Number of types 44 Surface area 2908,0308 Largest panels 5,7495 Smallest panel 3,4054
Largest minimum width 3,0549 Volume 53535,5476 STRUTS Number of struts 1032 Number of types 30 Total length 3334,7579 Longest strut 3,7898 Shortest strut 2,3717 Maximum end-angle 2,34 Minimum end-angle 1,47 DOME METRICS
Dome height 10,0200 Base major radius 28,7760 Base minor radius 0,0000 Spherical radius 46,3303 Base area 2593,9987
STEP-1 FRAME MODELLING
http://www.atecotank.com/
ATECO TANK GEODESIC DOME ROOF DESIGN PHASES
ATECO DOME FRAME STRUCTURAL ANALYSIS
FEA is a powerful 3D FEA program helping structural engineers to meet requirements in modern civil engineering. Intuitive handling, user friendliness
and efficient data input make working with FEA easy.
The FEA program family is based on a modular system. The main program FEA
is used to define structures, materials and loads for planar and spatial structural systems consisting of plates, walls, shells and members. Creating
combined structures as well as modeling solid and contact elements is also
possible.
FEA provides deformations, internal and support forces as well as soil contact stresses. Add-on modules facilitate the data input by creating structures as
well as connections automatically and perform further analyses and designs.
The modular approach allows you to combine all programs individually
according to your needs. Upgrades at a later time are always possible. FEA offering numerous interfaces represents the perfect tool for a smooth
interaction between CAD and structural analysis in Building Information
Modeling (BIM).
On the following webpages you can get an insight into the possibilities available in FEA. You can also try the free trial version to calculate and design
structures yourself.
Load Cases / Action Types
In the dialog box "Edit Load Cases and Combinations", you can create and
manage load cases as well as generate action, load and result combinations. It is possible to assign different types of actions to the individual load cases in
accordance with the selected standard. If several loads have been assigned
to an action type, they can be effective simultaneously or alternatively (for
example wind from either the left or right).
Individual Setting of Calculation Parameters
All types of members can be calculated according to linear static, second-
order or large deformation analysis. This selection option is available for load
cases as well as load combinations. Further calculation parameters can be
set individually for load cases, load and result combinations, which increases the flexibility regarding calculation method and detailed specifications.
Incremental Load Application
Loads can be applied incrementally. The increment option is especially useful
for calculations according to large deformation analysis. For members you can take into account shear deformations and relate internal forces to the
deformed or undeformed system. Furthermore, FEA is able to perform a post-
critical analysis.
Wind and Snow Load Generation According to Eurocode For modeling frameworks load generators are available to create wind loads
according to EN 1991-1-4 and snow loads according to EN 1991-1-3. The load
cases are generated depending on the roof structure. Another generator
creates coating loads (ice). Recurring load combinations can be stored as
templates.
Easy Structure Check
Members can be extended or divided graphically. The structure check detects
input errors like identical nodes or double members quickly and deletes them.
Intersecting members can be connected automatically during the input. The measure function allows for the determination of lengths and angles for
members and surfaces.
Non-Linearities of Members and Supports
You can specify non-linearities for member end releases (yielding, tearing, slippage etc.) and supports (including friction). Special dialog boxes are
additionally available to determine spring stiffnesses of columns and walls
based on the geometry input.
STEP-2 STRUCTURAL ANALYSIS
ATECO TANK GEODESIC DOME ROOF DESIGN PHASES
ATECO DOME STRUCTURAL ANALYSIS DESIGN CHECK The FEA add-on module ALUMINIUM designs members and sets of members consisting of aluminum for the ultimate and the serviceability limit state according to the standard The data specified in FEA concerning material, loads and load combinations must be entered in accordance with the design concept described in the Eurocode. The FEA material library already contains appropriate materials. Furthermore, FEA allows for an automatic creation of appropriate load combinations in accordance with the Eurocode. It is also possible to generate all combinations manually in FEA. In the add-on module ALUMINIUM you select first the members and sets of members that you want to design. In addition, you determine the load cases, load combinations and result combinations for the design. During the next steps, you can adjust the preset settings for lateral intermediate supports and effective lengths. In case continuous members are used, it is possible to define individual support conditions and eccentricities for each intermediate node of the single members. Then, in the program's background, a special FEA tool determines the critical loads and
moments required for the stability analysis.
Design for tension, compression, bending, shear and combined internal forces
Stability analysis for flexural buckling, torsional buckling and lateral torsional buckling
Automatic determination of critical buckling loads and critical moment for lateral torsional buckling for general load applications and support conditions by means of a special FEA program (eigenvalue analysis) integrated in the module
Option to apply discrete lateral supports for beams
Automatic cross-section classification
Integration of parameters from national annexes for the following countries:
DIN EN 1999-1-1/NA:2010-12 (Germany)
SN EN 1999-1-1/NA:2009-02 (Czech Republic)
IS EN 1999-1-1/NA:2010-03 (Ireland)
DK EN 1999-1-1/NA:2007-11 (Denmark)
STN EN 1999-1-1/NA:2011-03 (Slovakia)
CYS EN 1999-1-1/NA:2009-07 (Cyprus)
UNI EN 1999-1-1/NA:2011-02-25 (Italy)
NBN EN 1999-1-1/NA:2011-03 (Belgium)
NEN-EN 1999-1-1/NA:2011-12 (Netherlands)
BS EN 1999-1-1/NA:2007+A1:2009 (Great Britain)
Serviceability limit state design for characteristic, frequent or quasi-permanent design situation
Automatic cross-section optimization
Variety of cross-sections prov
