1 - SPATIAL STRUCTURES 
Procedures used:
Structures with one or two flat or curved layers 
Bars fixed or jointed at the ends
Spherical nodes and bars welded and fixed at the ends
Galvanised welded node bars assembled using HR bolts
Geometry in line with plans in the figures below


2 -  “STROP” SOFTWARE
STRUCTURAL OPTIMISATION
Can be used with Windows 8 & 10


STROP program developed by CCERET ENGINEERING in 1967 for in-house purposes, just as IT was starting in France, by
engineers and specialists in metal construction, has since undergone several improvements. It was subject to various tests and facilitated creation of
various types of structure: spatial tubular structures, pylons for high voltage lines, industrial buildings, fixed and mobile drilling platforms
metal and combined bridges etc... The first version of the STROP program was used on various computers notably: CDC 7600, DIGITAL, VAX,
IBM 34. The program was described in various technical and scientific journals (especially: 9th AIPC CONGRESS IN AMSTERDAM IN 1972,
ASCE TALL BUILIDINGS 1972 Leigh University USA and "Symposium on Industrialized Spatial and Shell Structures" at KIELCE in POLAND IN 1972 describing the theoretical bases
of the STROP program develop by CCERET. Currently the program has undergone various modifications, improvements and adaptations on 
office computers for use with Windows XP and Windows 7, 8, 10

GENERAL DESCRIPTION  OF "STROP" PROGRAM 
Purposes and areas of application
The "STROP" program is a general calculation and optimisation program for structures of all shapes (isostatic and hyperstatic). Its purposes are as follows:
Calculation of deformation of acceleration and retractive forces, taking account of buckling, in structures against various load scenarios.
Combinations of load scenarios
Research into extreme value of effort, deformation and constraints. Dimensioning and optimisation of sections
Calculation of weight of framework - standardisation of sections
Verification of resistance in structures with mesh in assembly phase (local bending of bars)
Naming of materials - Verification of assemblies (welds, bolts H.R. bolts)
These results can be supplied in digital and graphic form. The STROP program, which was written for the needs of
metal constructions, construction on BA wood constructions, may be successfully applied in other areas, especially: mechanical constructions,
lifting devices, aeronautical constructions, naval constructions, offshore construction. The structures may be made of different materials
with caracteristics corresponding to HOOKE's law.

Using the Stropview program
The Stropview program facilitates display of the structure, which can be on axonometry or perspective.
The display of node numbering is optional. The image of the structure can be moved, pivoted or zoomed.
There is a function for selecting 3 nodes to reduce the display only to the bars in the plan defined by these 3 nodes. This display simplification is useful for  complicated structures. By pressing the letter ‘b’, you select one bar, which turns red. By repeating this operation, you increase the order of the bar in
the rising order of the nodes. By pressing key ‘B’, you decrease the order of the bar. This is useful for seeing if there are not several bars superimposed due to a specification error. A command provides you with a preview before printing. The printing command provides printing directly. The advanced version of Stropview enables you to visualise deformations, acceleration and retractive forces, forces applied, identical profiles, naming by identical bars
before and after standardisation, external layers for an architectural view.

Printing the results
There are 2 style files, one for Word called ModeleWord.doc, one for Open-Office called ModeleOpenOffice.odt in the STROP root directory. These 2 files serve as a  model for a careful presentation on ‘portrait’ and ‘landscape’ mode. You have to open the file of results *.LST with the treatment of the associated text and use the style files.
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