Awning of a Filling Station in Douala, Cameroon
The new roofing system for the GULFIN Cameroun oil company's filling station in Douala is a particular structure with eccentric columns and non-symmetric cantilevered 21-foot-long beams.
|Design and Structural Analysis||
CASTI GROUP, a Dlubal Software customer based in Cameroon, designed the structure and managed and monitored the construction site.
The engineering team of CASTI GROUP designed the structure according to the Eurocodes in RSTAB and in the STEEL EC3 add-on module.
The awning covers a surface of 1,399 ft2. The columns are eccentric, connected to a 29.5-foot-long supporting beam. They absorb loads from the transverse beams which support the contour truss. The unbalance produced by the front and back non-symmetric transverse beams is reduced by the varying slopes on each side of the gutter.
The main supporting beam is an HEB 240 cross-section; the columns are HEB 300. Chords from the trusses were designed at first in HEB 120, then improved in HEB 100 with the RF-/STEEL Plasticity add-on module, which allows for the consideration of plastic reserves of a cross-section.
The roof covering is made of translucent polycarbonate panels with a double slope toward the central gutter supported by the main beam.
Both the production and assembly of the roof structure were made by a company specializing in steel construction. The investor opted for this company because of the complex assembly of this awning at a filling station.
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RF-/HOHLPROF add-on module for RFEM/RSTAB | Ultimate limit state designs of welded hollow section connections according to EC 3
RFEM add-on module RF-LOAD-HISTORY | Consideration of plastic deformations from previous load conditions
RFEM/RSTAB add-on module RF-/STEEL BS | Design of steel members according to BS 5950 or BS EN 1993-1-1
RFEM/RSTAB add-on module RF-/JOINTS Steel-DSTV | Standardized connections in steel buildings according to EC 3
RFEM/RSTAB add-on module RF-/FE-LTB | Lateral -torsional buckling analysis according to theory II. Order (FEM)
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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Programs Used for Structural Analysis
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Design of steel members according to Eurocode 3
Module Extension for STEEL EC3
Plastic design of cross-sections according the Partial Internal Forces Method (PIFM) and Simplex Method