Parameter identification for a point-supported cross laminated timber slab based on experimental and numerical modal ana
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ORIGINAL ARTICLE
Parameter identification for a point‑supported cross laminated timber slab based on experimental and numerical modal analysis Michael Kawrza1 · Thomas Furtmüller1 · Christoph Adam1 · Roland Maderebner2 Received: 10 March 2020 / Accepted: 19 November 2020 © The Author(s) 2020
Abstract In this paper, the dynamic properties of a point-supported cross-laminated timber slab are studied in order to determine the elastic material parameters on this basis. A detailed experimental modal analysis of the slab with dimensions 16.0 m x 11.0 m is performed, and seven modes including the natural frequencies, damping ratios and mode shape components at 651 sensor positions are identified. The found mode shapes are complex due to environmental influences that occurred during the twoday measurement campaign. This error is corrected by eliminating these influences. A finite element model of the slab is presented, whose parameters in terms of material properties and boundary conditions are determined by a model updating procedure. Based on the modal properties of the seven experimentally identified modes, an accurate and robust parameter set is obtained, which can be used in further numerical studies of the considered CLT to check serviceability limit criteria. Keywords CLT · Experimental modal analysis · Complex mode shape · Model updating
1 Introduction Since the development of cross laminated timber (CLT) in the early 2000s, timber construction has experienced an enormous gain in importance and has become a serious alternative to concrete and masonry constructions. In general, CLT is a panel of usually 3, 5 or 7 layers - for special purposes even 11 layers - of lamellas (Brandner et al. 2016), which are glued together on their side faces and stacked perpendicular to each other. With CLT elements of some manufacturers even the narrow faces are glued together. The application range of CLT is constantly expanding from single-story to multi-story buildings, which is accompanied by an increase in the span of the structural components. About one hundred years after the architect Le Corbusier developed the Dom-ino system (Schickhofer et al. 2010) (i.e. buildings in frame construction with point-supported reinforced concrete slabs), today buildings in timber construction with point-supported CLT slabs are also being built following * Christoph Adam [email protected] 1
University of Innsbruck, Unit of Applied Mechanics, Technikerstr. 13, 6020 Innsbruck, Austria
University of Innsbruck, Unit of Timber Engineering, Technikerstr. 13, 6020 Innsbruck, Austria
2
the same idea. An example is the wood-hybrid student residence building at the Campus of the University of British Columbia in Vancouver, which was the tallest mass timber structure in the world at the time it was opened in 2017. The CLT slabs in the 18-story building are point-supported by glued laminated (glulam) columns, which are located at the corners and the edges of each panel. Consequently the resulting column grid is rather narrow. The eco
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