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High Performance Connections to Mitigate Seismic Damage in Cross Laminated Timber (CLT) Structures

https://research.thinkwood.com/en/permalink/catalogue2707
Year of Publication
2020
Topic
Connections
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Author
Smiroldo, Francesco
Gaspari, Andrea
Viel, Davide
Piazza, Maurizio
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Topic
Connections
Seismic
Keywords
Finite Element Modelling
Non-linear Analysis
Seismic Engineering
Earthquake
Connection Systems
Language
English
Conference
World Conference on Earthquake Engineering
Research Status
Complete
Summary
The present study proposes a new connection system for Cross Laminated Timber (CLT) structures in earthquake prone areas. The system is suitable for creating wall-floor-wall and wall-foundation connections, where each connection device can transfer both shear and tension forces, thus replacing the role of traditional “hold downs” and “angle brackets”, and eliminating possible uncertainty on the load paths and on the force-transfer mechanism. For design earthquakes intensity, the proposed system is designed to remain elastic without accessing the inelastic resources, avoiding in this way permanent deformations in both structural and non-structural elements. However, in case of unforeseen events of exceptional intensity, the system exhibits a pseudo-ductile behaviour, with significant deformation capacity. Furthermore, in the proposed system the vertical forces are directly transferred through the contact between wall panels, avoiding compressions orthogonal to the grain of the floor panels. In this research, the connection system was analysed via finite element modelling based on numerical strategies with different levels of refinements. Nonlinear analyses were performed in order to investigate the response of the connection to shear, tension and a combination of such forces. The numerical responses were compared with those of full-scale experimental tests performed on the proposed connection subjected to different kind of loading configuration. The results appear as promising, suggesting that the proposed connection system could represent a viable solution to build medium-rise seismic-resistant CLT structures, that minimise damage to structural and non-structural elements and the cost of repair.
Online Access
Free
Resource Link
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Transversal Load Sharing in Timber-Concrete Floors - Experimental and Numerical Investigations

https://research.thinkwood.com/en/permalink/catalogue1617
Year of Publication
2016
Topic
Mechanical Properties
Material
Timber-Concrete Composite
Application
Floors
Author
Kieslich, Hubertus
Holschemacher, Klaus
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Floors
Topic
Mechanical Properties
Keywords
Non-linear Analysis
Load Distribution
Finite Element Model
Pushout Testing
Full Scale
Bending Tests
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2377-2386
Summary
Timber-steel hybrid beams have already been proposed, tested and analyzed for their use in frame multistorey buildings. Although these beams can be combined with any type of structural floor, their use with concrete decks opens the door to new and promising structural strategies. Present-day timber-concrete floors are a good solution for contemporary multi-storey buildings. They provide in-plane stiffness, enough mass for sound isolation and can be optimized from a structural performance point of view. Meanwhile hybrid beams could provide lightness, reduced structural depth, reduce the creeping behaviour and make frame semi-rigid joints easy to build. The goal is therefore the development of a combined system of hybrid beams and concrete floors, proposing prefabricated or semi-prefabricated timber-steel-concrete ribbed elements that could make the most of all this potential. First design concepts and planned tests are presented in this paper.
Online Access
Free
Resource Link
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