Awning of Filling Station in Douala, Cameroon
The new roofing system for the petrol station of GULFIN Cameroun in Douala, an oil company, is a particular structure with eccentric columns and non-symmetric cantilevered 6.5 m long beams.
|Design and Structural Analysis||
CASTI GROUP, a customer of Dlubal Software based in Cameroon, designed the structure, 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 130 m2. Columns are eccentric, connected to a 9 m 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 a HEB 240 cross-section, columns are HEB 300. Chords from the trusses were at first designed 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 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 specialized 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-/DYNAM Pro - Natural Vibrations Add-on Module for RFEM/RSTAB | Determination of natural frequencies and mode shapes
RF-/PLATE-BUCKLING Add-on Module for RFEM/RSTAB | Plate Buckling Analysis for Plates with or Without Stiffeners According to 1993-1-5
RFEM/RSTAB Add-on Module RF-IMP/RSIMP | Generation of Geometric Replacement Imperfections and Pre-deformed Replacement Structures
Extension of the RF-/STEEL Warping Erosion module | Lateral -torsional buckling analyzes of members according to the second -order theory with 7 degrees of freedom
RFEM/RSTAB add-on module RF-/TOWER effective lengths | Determination of effective lengths of lattice towers
RFEM add-on module RF-CONCRETE NL | Nonlinear reinforced concrete calculation for the serviceability limit state
RFEM/RSTAB add-on module RF-/JOINTS Steel-Column Base | Hinged and restrained column bases according to EC 3
RF-/DYNAM Pro-Natural Vibrations Add-on Module for RFEM/RSTAB | Determination of Natural Frequencies and Mode Shapes
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