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 two-day 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.
Highlights
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
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
Considering the results presented so far, only density is treated as independent optimization parameter in both the upper and lower area of each panel, while the elastic properties E1, G12 and G23 remain a single parameter set for the whole slab
Summary
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. 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 being built following. The economic use of point-supported CLT panels requires a column grid of at least twice the span width compared to the student residence building in Vancouver. Muster and Frangi (2020) conducted punching tests on a point-support system without metallic fasteners. In this system, beech plywood panels are used to locally enlarge the cross-section and reinforce the CLT area to increase the load-bearing capacity
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