- Comportamento sismico di edifici lignei a pannelli in legno lamellare incrociato
- Seismic behaviour of cross-laminated timber buildings
- Gavric, Igor
Subject
- Cross-laminated timber panels,
- Joints with mechanical fasteners,
- INGEGNERIA CIVILE E AMBIENTALE
- ICAR/09 TECNICA DELLE COSTRUZIONI
Description
- 2011/2012
- Cross-laminated timber, also known as X-Lam or CLT, is well established in Europe as a construction material. Recently, implementation of X-Lam products and systems has begun in countries such as Canada, United States, Australia and New Zealand. So far, no relevant design codes for X-Lam construction were published in Europe, therefore an extensive research on the field of cross-laminated timber is being performed by research groups in Europe and overseas. Experimental test results are required for development of design methods and for verification of design models accuracy. This thesis focuses on the continuation of SOFIE research project which started in 2005, conducted by IVALSA Trees and Timber Research Institute (San Michele all' Adige, Trentino, Italy). The aim of this project is the development of multi-storey timber building systems using prefabricated cross-laminated panels. As several parts of Italy are earthquake-prone areas, seismic resistance of such building system has to be ensured. Thus, within the scope of the SOFIE project, an extensive experimental research on seismic resistance of X-Lam building system has been performed. The project started with performance of racking tests on wall panels with different layouts of connections and openings and pseudo-dynamic tests on a full scale one-storey building, continued with shaking table tests on a 3-storey building and on a 7-storey building, the latter one conducted at E-Defense facility in Miki, Japan. Experimental tests provided excellent outcomes, as the buildings were able to survive a series of strong recorded earthquakes, such as Kobe earthquake (1995), virtually undamaged, while at the same time demonstrating significant energy dissipation. In the scope of this thesis, an extended experimental programme on typical X-Lam connections was performed at IVALSA Research Institute. In addition, cyclic tests were carried out on full-scale single and coupled cross-lam wall panels with different configurations and mechanical connectors subjected to lateral force. The outcomes of these tests were used for evaluation of mechanical properties, ductility ratio, energy dissipation, and impairment of strength, which are all needed in seismic design and are currently not provided by codes of practice such as the Eurocode 8. In addition, analytical models to predict stiffness and strength at different building levels such as connections, wall systems and entire buildings were developed. Further, capacity design method for X-Lam buildings was introduced and was verified with extensive database of experimental results. In the capacity design, overstrength factors are needed, thus these factors were evaluated based on experimental tests on X-Lam subassemblies. Experimental results served also for calibration of advanced component FE models for non-linear static and dynamic numerical analyses of X-Lam walls and buildings, developed at the University of Trieste. Numerical analysis of X-Lam wall systems using the FE model was carried out in order to extend the results of the experimental tests to different configurations of technical interest. Outcomes of the parametric study provided better understanding of the seismic behaviour and energy dissipation capacities of X-Lam wall systems. It was concluded that the numerical and analytical models, presented in this thesis, are a sound basis for determining the seismic response of cross-laminated timber buildings. However, future research is required to further verify and improve these prediction models.
- XXV Ciclo
- 1985
Date
- 2013-05-08T07:53:55Z
- 2013-05-08T07:53:55Z
- 2013-04-22
Type
- Doctoral Thesis
Format
- application/pdf
Identifier
urn:nbn:it:units-10064