The Spanish language module has been updated to version 80.
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In the latest version of the software we have added the following new features:
- Improved license management
- Bug fixing and small improvements
In the latest version of the software we added new features:
- Fire protections: checks on the load-bearing function of structural members initially protected from exposure to fire can now be performed. Gypsum Plasterboard, Gypsum Plasterboard Type F, Gypsum Fibreboard and custom definitions can be used. In the first three cases, the software automatically calculates the time of start of charring tch, the failure time of protection tf (evaluated differently for vertical and horizontal elements), the time ta and the insulation coefficient k2. In the case of custom definition, the designer can manually enter the parameters in order to manage protection solutions not listed in the standard or defining specifications of a particular manufacturer. For all protected structural elements, the rules proposed in EN 1995-1-2 are used with all the cases proposed by the standard for the calculation of the charring depth dchar,n, the calculation of k0 and k2 and the calculation of the effective charring depth deff.
The joist floors and the framed walls with protections are calculated as assemblies with void cavities following the indications of Annex D of Eurocode EN 1995-1-2, which provides for different times of start of charring for the sides directly exposed to fire and for the sides facing the empty cavities.
- CLT panels by the Spanish manufacturer Egoin added: it is now possible to check the CLT structures made with Egoin panels
In the latest version of the software we added new features:
- Inclusion of LVL: both softwood and beech LVL are now available and they can be used as beams, columns, joist floors and solid wood floors. The databases include the products of the main European manufacturers: Metsa Wood (Kerto), Steico e Pollmeier (BauBuche e Fichte LVL).
- Improvement of the reactions in foundation export: inclusion of two new fields in the “actions.csv” file providing the name and the length of the element in each node. Inclusion of three new layers in the “geometry.dxf” file displaying the nodes numbers, the walls lines and the names of the elements in each node.
- Improvement of the databases translations: all the databases are now consistently translated and they support the transition of the software from Italian to English version and viceversa.
- Inclusion of Uso Fiume and Uso Trieste timber: softwood and chestnut Uso Fiume timber and softwood Uso Trieste timber are now available and they can be used in beam, column and joist elements according to their ETA specifications.
- Spreadsheet for the calculation of the interstorey drift sensitivity coefficient: the users can now download form their Personal area the spreadsheet for the calculation of the interstorey drift sensitivity coefficient for the assessment of the second-order effects.
- New welcome page: the software shows an interactive welcome page that will host constantly updated contents such as papers, events, blog posts, software updates and tutorial videos.
The check of CLT elements under fire conditions can be crucial in the design of a timber structure. Due to the layered structure of their cross-section, the calculation process is peculiar as pointed out in the examples below.
The charring depth of a CLT panel under fire conditions depends on the properties of the glue used in the panel assembly. The polyurethane glue (PUR), often used by manufacturers, is not resistant in case of high temperature meanwhile MUF glue (melamine-urea-formaldehyde) shows better performance.
This is why the new TimberTech Buildings additional module for the fire design of timber structures implements two calculation models to be applied according to the CLT properties certified by the manufacturer:
- Glue line integrity maintained: the charring rate is assumed to be constant through the whole cross-section. This method can also be used when the manufacturer’s certificates suggest a constant charring rate (higher than that of the wood) to take into account the lower performance of the glue in a simplified manner.
- Glue line integrity not maintained: the charring rate is not constant and depends on the panel stratigraphy. The CLT cross-section can be seen as a sequence of layers where each one acts as a protective layer for the following one. Therefore, the method for protected elements provided by EN 1995-1-2 can be applied to obtain a charring rate trend such as the one reported in the figure below where the k3 factor usually has a value of 2.
CLT design example: R60 with glue line integrity not maintained
- Cross-section: 120 mm (20-30-20-30-20)
- Glue: glue line integrity NOT maintained
- Fire exposure: 60 minutes on one side
- Unidimensional charring rate: beta0 = 0.65 mm/min
- Charring depth: dchar,0 = 53 mm. Layer 1 (constant charring rate), layer 2 (double charring rate in the first 25 mm, then constant charring rate), strato 3 (double charring rate up to the required 60′)
- Effective charring depth: def = dchar,0 + k0d0 = 60 mm
- Effective cross-section: 60 mm (20-30-10)
Bending check 101% (MEd = 11.36 kNm)
Shear check 14% (VEd = 7.81 kNm)
Download the TimberTech Buildings calculation report about this example
CLT design example: R60 with glue line integrity maintained
- Cross-section: 120 mm (20-30-20-30-20)
- Glue: glue line integrity NOT maintained
- Fire exposure: 60 minutes on one side
- Unidimensional charring rate: beta0 = 0.65 mm/min
- PCharring depth: dchar,0 = 39 mm. Constant charring rate through all layers
- Effective charring depth: def = dchar,0 + k0d0 = 46 mm
- Effective cross-section: 74 mm (20-30-20-4)
Bending check 55% (MEd = 11.36 kNm)
Shear check 12% (VEd = 7.81 kNm)
Download the TimberTech Buildings calculation report about this example
In the latest version of the software we added new features:
- Verification of the timber structural elements in fire conditions: it is now possible to perform the resistance checks in fire conditions of the unprotected structural timber elements.
The development of an update to include fire protection layers in the analysis and verification process is already in progress.
For further information on the fire design module please click here. - Improvement in the management of extended and polygonal walls: extended and polygonal walls can now support floor, roof and wall elements according to more complex configurations.
- Improvement of the formatting of the calculation report.
In the latest version of the software we have added the following new features:
- Inclusion of Simpson Strong-Tie connections: a selection of Simpson Strong-Tie connections with all the relevant strength and stiffness parameters is now available in TimberTech Buildings. The selection includes hold-downs, timber-to-timber shear and tensile plates, timber-to-concrete shear plates and timber-to-timber and timber-to-concrete angle brackets with the appropriate fasteners and anchors.
- Binderholz CLT update: two material are now available for Binderholz CLT: BBS 125 and BBS XL. The user can choose the appropriate material according to the panel type.
- Bug fixing and small improvements
In the latest version of the software we have added the following new features:
- Automatic definition of the wind action according to the international version of Eurocode EN 1991-1-4: in case the project uses Eurocodes as the reference standard, it is now possible to adopt the values of the wind actions on walls and roofs automatically calculated by the software according to the procedure provided in the international version of EN 1991-1-4. The software automatically proposes the values of the wind action components starting from the basic wind velocity on the site and applying all the relevant factors mentioned in the standard. Also, some of the pressure coefficients on walls can be automatically calculated according to the location of the wall and according to the building shape relative to the wind directions.
- User-defined wind pressure and/or pressure coefficients: it is still possible to manually edit the automatically proposed wind actions for a specific load definition for both roofs and walls or, alternatively, it is possible to edit only the pressure coefficients cp while maintaining the automatic calculation of all the other parameters required for the definition of the wind action.
- Improvement in the seismic mass calculation: improvement in the management of the translational seismic mass and of the rotational inertia of linear loads.
- Bug fixing and small improvements
New paper by Francesco Boggian, Mauro Andreolli and Roberto Tomasi on the assessment of stiffness and shear strength of CLT beams loaded in-plane.
Abstract: Cross Laminated Timber (CLT) is a relatively new timber product used in construction that has gained popularity over the last decade. The product itself is constituted by multiple glued layers of juxtaposed boards, usually arranged in an orthogonal direction between one layer and the adjacent ones. This particular structure brings several benefits, such as the possibility to use the same product both for walls and slabs, since it can bear in-plane and out-of-plane loads. However, the mechanical behavior differs from usual timber products, and research is still ongoing to achieve common agreement on standard procedures for testing products and theories for evaluating stresses for safety verifications. This paper focuses on the in-plane shear behavior of CLT and analyzes the existing methods to evaluate shear stresses. An experimental part then presents a four-point bending test of CLT beams with a specific geometry to induce shear failure. Results are reported both for the elastic range test, measuring the Modulus of Elasticity, and for the failure test to investigate shear behavior with regard to different mechanisms. Previously exposed methods are used for the calculation of shear stresses and to analyze the correspondence between them, and the results are then compared with other existing tests and values in literature. A new test setup for future research is eventually proposed.
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In the latest version of the software we have added the following new features:
- Improvement of the graphical performace: it is now possible to choose whether to display the floor calculation lines and the points in the 3D graphical interface in order to obtain a clearer view of the model and an increased graphic speed in the modelling and analysis phase. This feature is very useful in the management of complex models.
- Automatic setting of the dxf import scale: the software is now able to automatically propose the correct import scale for a dxf drawing. The user can still edit manually the proposed import scale if needed.
- Automatic definition of the wind action according to Circolare Esplicativa 21 January 2019 of NTC 2018: in case the project uses NTC as the reference standard, the automatic calculation of the wind action on walls and roofs has been updated according to the provisions of the new Circolare Esplicativa. The software automatically proposes the values of the reference velocity pressure, of the exposure coefficient and of the aerodynamic coefficients for the walls according to the geolocation of the building and according to its shape relative to the wind directions.
- User-defined wind pressure and/or aerodynamic coefficients in case of NTC as reference standard: it is now possible to manually edit the automatically proposed wind pressure for a specific load definition for both roofs and walls or, alternatively, it is possible to edit only the aerodynamic coefficients cp while maintaining the automatic calculation of all the other parameters required for the definition of the wind action.
- Improvement of the stability of some features such as the milestones, the milestones with analysis and the connection auto-design.
- Inclusion of the Knauf Diamant X sp. 15 mm panel: also the gypsum plasterboard panel for structural use Knauf Diamant X with a thickness of 15 mm is now available and it can be used as sheathing panel in framed walls.
- Bug fixing and small improvements
