Cross Laminated Timber (CLT) Beams Loaded in Plane: Testing Stiffness and Shear Strength

New paper by Francesco Boggian, Mauro Andreolli and Roberto Tomasi on the assessment of stiffness and shear strength of CLT beams loaded in-plane.

Set up

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.

Failure modes

Continue…

Download the full paper

CLT multi-family residential building

Multi-family residential building with n. 8 lodgings, arranged on three levels above ground and a basement level used as a garage. The above-ground structure was build with CLT panels for walls and floors and with glulam timber beams and HEB steel beams.
Site of construction: Ischia di Pergine, Trento (TN)

Structural designer: Dr. Ing. Rossano Stefani
Architectural designer: Arch. Aldo Tomaselli
Construction company: Domus Immobiliare S.r.l.

Five floors residential buildings with framed walls

 

Residential building complex commissioned by ATER Trieste consisting of 5 buildings. Each building has 5 floors above ground plus the pitched attic floor. The walls are made with timer frames, while the floors are in CLT, including the ramps and the stairways, with the exception of the roof which is made of joists. The terraces are partially supported by steel structures.

Structural designers of the wooden structures: Ing. Sandro Rossi – Ing. Raffaele Cruciani, Ascoli Piceno, Italy

studioing-cru.ro@libero

Timber light-frame and CLT school

School complex made of three buildings separated by two seismic joints.
The strucures in elevation are made of both CLT (XLAM) panels and light frame walls. More in depth, the buildings hosting the classrooms and the locker rooms are built with structural light-frame walls while the gym building is made of CLT (XLAM) panels. Finally, the outdoor stairs are made of steel beams while the indoor stairs and the foundations are built in reinforced concrete.

Structural project: ReWis, Comano Terme (Trento)
www.rewis.it

Multi-storey residential CLT building

Multi-storey residential CLT building built in Sesto Fiorentino (Florence).
The building is made of four floors and has a maximum height of 13 m while the building base covers a 24.8 x 15.5 m rectangle.
The structure in elevation is entirely built with CLT (XLAM) panels while the basement and the foundations are made of reinforced concrete.

Structural project: ReWis, Comano Terme (Trento)
www.rewis.it

TimberTech Buildings: sold in 14 states

After long and hard work we are proud to share our important result regarding the software TimberTech Buildings. Thanks also to the translation in four languages (Italian, English, Spanish and Greek) we were able to sell it and distribute it in more than 14 countries worldwide.
In the map below you can view the places where some of the licenses have been activated (purchased by professionals and companies and educational versions given in use to students and professors).

Our resellers abroad.

The seismic behaviour of buildings erected in Solid Timber Construction


The report produced by the Institute of Timber Engineering and Wood Technology of Graz University of Technology “The seismic behaviour of buildings erected in Solid Timber Construction, G. Schickhofer, A. Ringhofer” is now available for download. It refers to the seismic design according to EN 1998 for a 5-storey reference building in CLT. In the section Tutorials & Samples you can download the sample file of the structure modeled with our software TimberTech Buildings.