Oxigeno in San Francisco de Heredia, Costa Rica
A unique project called "Oxigeno" is currently under construction in San Francisco de Heredia, San José, Costa Rica. The recreational and commercial space, which measures almost 1,345,489 ft², offers the visitor a relaxing shopping atmosphere in harmony with nature. Amongst others, 200 trees were planted on the site. The main food court is covered with a 17,222 ft² ETFE cushion as roof, currently the biggest one in the world.
|Engineering ETFE + Cable Structure + Cutting Patterns||
|General Contractor ETFE Cushion Roof||
|Manufacturing ETFE Foil||
Novum Membranes GmbH
|Manufacturing Stainless Steel Cables||
The Dlubal customer z3rch used RFEM and RF-FORM-FINDING for the form-finding and the calculation of the structure including the cable web structure and the membranes.
Structure of ETFE Roof
The roof with a diameter of 148 ft consists of a ETFE foil which is supported by a cable web. At the edge, square hollow sections form two circulating rings which are supported on the customer's structure.
A security system against the formation of water pockets is used for this project, which has been developed by the company 3dtex. No plastic tube is inserted here inside the cushion. This system shall ensure a higher safety against the formation of water pockets on the one hand and a clear, elegant architectural design of the structure on the other hand.
The ETFE cushion is the first one in the city of San Francisco de Heredia and at the same time the biggest in the world.
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Side view of the timber and steel structure of the airship with the 'umbrella' membrane (© Jan Slavík, DOX)
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
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Form-finding of tensile membrane and cable structures