Laminated Glass - Timber Panel as a Dissipative Bracing Structural Component for Existing Frame Structures

Abstract eng:
The idea for development of innovative multipurpose structural component appeared following the recent decade rapid development of laminated glass structural elements as well as popularity of cross laminated timber elements. The need and introduction of innovative structural elements is running beyond the existing code guidance and influences their further enhancement. The collaborative research of University of Zagreb and University of Ljubljana has been launched in order to develop a hybrid structural component that can be used for various purposes in structures located in earthquake prone areas: as an independent load-bearing component for construction of prefabricated timber structures, as a temporary or even permanent support and bracing element in heritage buildings, as an external or internal bracing element in retrofitted or newly built frame structures or as a versatile element for creation of the multi-functional and adaptive building envelope. It is constructed of cross-laminated timber lintels and studs with glued-in rod joint fasteners and laminated glass infill. Due to CLT frame, the hybrid component can be easily connected with surrounding structural elements made of any structural material by semi-rigid ductile steel fasteners or other types of fasteners that can be fixed to CLT frame. The laminated glass infill is placed inside the timber frame in the way that can carry vertical and lateral load, provides high energy dissipation along the glass-to-timber contact and does not influence structural ductility of surrounding timber frame. Full-scale specimens were tested by combined constant vertical load and displacement controlled cyclic horizontal load (racking load). Several series of equal specimens were tested varying boundary conditions (shear cantilever, shear wall) and intensity of vertical load. Both vertically loaded by assumed dead load of upper structure and vertical load equal to weight of panel were applied. The case of vertical load equal to own weight corresponds to cases of installing of panels in existing frame structure. Specimens were repaired after attaining large deformations and damages of frame joints and retested. The purpose of racking test was to obtain data for development of computational model of tested type of structural element that can be used for prediction of inelastic response of buildings with the glass-infilled CLT frames on seismic action. In the paper the results of testing are presented in form of hysteresis loops and backbone curves. Data on stiffness degradation and energy dissipation is given in quantitative way as well as in diagrams showing the changing of those parameters with increasing of horizontal displacements during testing

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