Water Sports Center, Formentera, Spain
On the Mediterranean island of Formentera, a new cross-laminated timber building was constructed, which is used by a sailing school and a water sports center. The one-story building consists of two separate sections that are connected by low-lying glued laminated beams in the roof area.
|Investor||Formentera Island Council, Spain|
Arq. Marià Castelló, Spain
Ing. Albert Admetlla Font
Kmod Enginyeria en Fusta SL, Spain
Grupo Tragsa - Sepi, Spain
Velima Systems SL, Spain
Marià Castelló designed the project according to ecological building criteria and used materials of natural origin, such as wood. The structural analysis was performed by Kmod Enginyeria en Fusta SL, which carried out the strength and serviceability limit state designs with RFEM and RF-LAMINATE. BIM-based planning was also carried out, and cadwork software was used.
Structure and Design
The cross-laminated timber roof panels were designed as a pane that transfers the horizontal loads to the transverse walls. All the walls are also made of cross-laminated timber. The connections in the roof and wall elements were modeled with line hinges. The flexibility was considered according to the selected type of bolting. The floor consists of one-way spanning, 21.3-foot-long cross-laminated timber panels on an elastic boundary strip foundation.
One of the greatest challenges in the structural analysis of this building was to additionally stabilize the entire structure at the top by arranging a frame structure made of glued laminated timber beams more than 3.2 ft in height. In some places, these beams serve as cantilevers with a length of 19.6 ft; they connect to other beams and form a spatial structure. They were modeled as surfaces in order to better assess the lateral stability. The transversal wind loads on these elements were also considered and evaluated in order to demonstrate the maximum deflection according to the standard.
The RF-LAMINATE add-on module was used to define the CLT panels and the glulam roof beams as surface elements. The add-on module was also used to optimize the surface thicknesses and to design the load-bearing capacity.
Project LocationWater Sports Center
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In this article, the adequacy of a 2x4 dimension lumber subject to combined bi-axial bending and axial compression is verified using RF-/TIMBER AWC add-on module. The beam-column properties and loading are based on example E1.8 of AWC Structural Wood Design Examples 2015/2018.
Result of Eigenvalue Analysis for Single-Span Beam With Lateral and Torsional Restraint without Intermediate Supports
- General stress analysis
- Graphical and numerical results of stresses and stress ratios fully integrated in RFEM
- Flexible design with different layer compositions
- High efficiency due to few entries required
- Flexibility due to detailed setting options for calculation basis and extent
- Based on the selected material model and the layers contained, a local overall stiffness matrix of the surface in RFEM is generated. The following material models are available:
- Hybrid (for combinations of material models)
- Option to save frequently used layer structures in a database
- Determination of basic, shear and equivalent stresses
- In addition to the basic stresses, the required stresses according to DIN EN 1995-1-1 and the interaction of those stresses are available as results.
- Stress analysis for structural parts of almost any shape
- Equivalent stresses calculated according to different approaches:
- Shape modification hypothesis (von Mises)
- Maximum shear stress criterion (Tresca)
- Maximum principal stress criterion (Rankine)
- Principal strain criterion (Bach)
- Calculation of transversal shear stresses according to Mindlin, Kirchhoff, or user-defined specifications
- Serviceability limit state design by checking surface displacements
- User-defined specifications of limit deflections
- Possibility to consider layer coupling
- Detailed results of individual stress components and ratios in tables and graphics
- Results of stresses for each layer in the model
- Parts list of designed surfaces
- Possible coupling of layers entirely without shear
- Can I use RFEM to calculate a log house three-dimensionally?
- How do I display some results of all load cases in the printout report, but other results of the selected load cases only?
- I would like to carry out the flexural buckling design for timber components with imperfections and internal forces according to the second-order analysis. Is it sufficient to activate this in Details of the RF‑/TIMBER Pro add-on module or is it necessary to make additional settings?
- Can I design laminated veneer lumber with RFEM/RSTAB?
- How can I calculate a timber-concrete composite floor with cross-laminated timber?
- Is it possible to save the structures of the manufacturer-specific cross-laminated timber plates in the RF‑LAMINATE add-on module?
- How is it possible to display the main support direction graphically in RF‑LAMINATE?
- Is it possible to create a second design case in RF‑LAMINATE?
- I have a model of a timber building, which I have transferred from Scia Engineer and adapted it into the RFEM program. The models should be the same; however, it can only be calculated in Scia Engineer while RFEM reports singularity. How do I edit the model to analyze it in RFEM?
- How can I model a timber-concrete composite floor?
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
Deflection analysis and stress design of laminate and sandwich surfaces
Stability analysis according to the eigenvalue method