Creep Behavior of CLT Beams with Finite Thickness Layers of Flexible Adhesives

Klaudia Śliwa-Wieczorek; Paweł Szeptyński; Tomasz Kozik; Martino Gubert

doi:10.3390/ma16124484

Creep Behavior of CLT Beams with Finite Thickness Layers of Flexible Adhesives

Materials (Basel). 2023 Jun 20;16(12):4484. doi: 10.3390/ma16124484.

Authors

Klaudia Śliwa-Wieczorek¹, Paweł Szeptyński², Tomasz Kozik³, Martino Gubert⁴

Affiliations

¹ Division of Bridge, Metal and Timber Structures, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
² Division of Structural Mechanics and Material Mechanics, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
³ PalettenWerk Kozik Sp. z o. o., 34-240 Jordanów, Poland.
⁴ Eurac Research, 39100 Bolzano, Italy.

Abstract

Creep behavior of Cross-Laminated-Timber (CLT) beams with a finite-thickness layer of flexible adhesives is investigated. Creep tests were carried out for all component materials as well as for the composite structure itself. Three-point bending creep tests were performed for spruce planks and for CLT beams, and uniaxial compression creep tests were performed for two flexible polyurethane adhesives: Sika^® PS and Sika^® PMM. All materials are characterized with the use of the three-element Generalized Maxwell Model. The results of creep tests for component materials were used in elaboration of the Finite Element (FE) model. The problem of linear theory of viscoelasticity was solved numerically with the use of the Abaqus software. Obtained results of Finite Element Analysis (FEA) are compared with experimental results.

Keywords: CLT beams; creep; flexible adhesives; viscoelasticity; wood.

Grants and funding

Research Grants from the Faculty of Civil Engineering at Cracow University of Technology