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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

K. Tavoussi Tafreshi, W. Winter, T. Pixner:
"Development of earthquake bracing systems for multi-storey timber buildings using slender shear wall elements out of cross-laminated panels";
Vortrag: WCTE 2008 - 10th World Conference on Tmber Engineering - Miyazaki, Miyazaki, Japan (eingeladen); 02.06.2008 - 05.06.2008; in: "WCTE2008-10th World conference on Timber Engineering-Miyazaki", (2008), S. 263.



Kurzfassung englisch:
In modern timber buildings big openings in the façade are getting more common.
The aim of the research project conducted together with a producer of CLT and the Austrian forest products laboratory was to minimize the number and size of the shear walls provided to resist seismic loads by using stiff massive panels and non-conventional high performance anchorage systems in steel. These shear walls should be produced in an economic production process using vacuum pressing equipment under a pressure of 1-2 kg/cm².
The seismic design was based on a case study of a two-storey single-family house with asymmetrical bracing system and low torsion stiffness as worst case. Static and dynamic analyses were computed with special framework software frequently used by structural engineers. For the time history analyses of the building seven artificial earthquakes according to Eurocode 8 were generated. The structural behaviour of the shear walls were modelled using a special configuration of quadratic frames with eccentric connections.
By combining criteria´s of optimal structural behaviour and production preferences 12 wall types were produced. Each wall type differed in the thickness, orientation and the angle of the laminated boards. The dimension of all test samples was 120 by 280 cm.
For this 12 walls monotone full size tests have been carried out by applying a maximum lateral load of approx. 200 kN. As a result of these tests, two types of panels have been selected for cyclic testing. The anchorage system for these cyclic tests consisted of two steel channels placed on both sides of the shear wall. The idea was to transmit the tensile forces with a steel element to the top of the wall to avoid anchoring high tensile loads directly in the wood. For the steel to steel connection of the tension element to the anchor in the foundation special steel nails as driving fasteners were used. This non-detachable connection executable on the construction site can provide high ductility in case of earthquake.
The tests showed the similar efficiency of multilayer shear walls produced by vacuum presses in comparison to walls produced under high pressure with hydraulic presses. No fracture could be observed for the majority of tested walls. A vertical layer increases the load carrying capacity considerably and will be necessary for such high loads. Under cyclic loading perpendicular laminated timber panels decrease their stiffness more significant compared to inclined laminated timber panels.

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.