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7 records – page 1 of 1.

Against the Grain: Redefining the Living Unit – Advanced Slotting Strategies for Multi-Storey Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue795
Year of Publication
2014
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Kaiser, Alex
Larsson, Magnus
Girhammar, Ulf
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Manufacturing
Multi-Storey
CNC
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Using Charles and Ray Eames’s famous 1950s House of Cards slotting toy as both design metaphor and structural precedent provides the starting point for a novel building logic (utilising three existing Swedish timber systems) that allows volumetrically slotted units to stack inside of and support each other. Contemporary computer-aided fabrication techniques based on evolutionary algorithms and CNC manufacturing strategies are used to produce a methodology for designing a kit-of-parts system at the scale of the skyscraper, based on the slotting together of cross-laminated timber (CLT) panels. A catalogue of novel slotting methods is produced, and a number of alternative slotted joint treatments identified that hold promising potential for further development, parametrically design and control volumes, understand the fabrication workflow and constructional sequence on site, and build prototypes of the chosen slotting configurations at scales ranging between 1:50 and 1:1.
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Assessment of Connections in Cross-Laminated Timber Buildings Regarding Structural Robustness

https://research.thinkwood.com/en/permalink/catalogue1948
Year of Publication
2018
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Huber, Johannes
Ekevad, Mats
Berg, Sven
Girhammar, Ulf
Year of Publication
2018
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Connections
Mechanical Properties
Keywords
Finite Element Method
Deformation
Multi-Storey
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 20-23, 2018, Seoul, Republic of Korea
Summary
Cross-laminated timber makes timber buildings with an increasing number of storeys achievable. With more storeys, structural robustness needs more attention to make a building survive unforeseen events (e.g. accidents, terrorism) and save lives. For steel and concrete buildings, design methods for robustness focus on connection details. The assessment of joints in cross-laminated timber buildings regarding robustness is rather limited in the literature. The objective of this paper is to conduct an initial assessment of the connectors after the removal of a wall in a platform cross-laminated timber building. We used the finite element method and the component method for the analysis of a case building. The results indicate that the wall-to-wall and the floor-to-floor connectors may fail at low deflection levels leading to high shear loads in the floor panel above the removed wall, which might induce cracking. The removal analysis was only partially completed, but we identified an indication of the deformation behaviour of the case building. Testing and refined modelling of the connections is needed in the future to verify the results. This study may facilitate future investigations regarding robustness of multi-storey cross-laminated timber buildings.
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Evaluation of Bending Tests on Composite Glulam-CLT Beams Connected with Double-Sided Punched Metal Plates and Inclined Screws

https://research.thinkwood.com/en/permalink/catalogue436
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Floors
Author
Jacquier, Nicolas
Girhammar, Ulf
Publisher
ScienceDirect
Year of Publication
2015
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Floors
Topic
Connections
Mechanical Properties
Keywords
Multi-Storey
Four Point Bending Test
Shear connection
Double-sided Punched Metal Plate
Separation Forces
Research Status
Complete
Series
Construction and Building Materials
Summary
This report presents bending tests performed on composite beams made from glulam beams and cross laminated timber (CLT) panels. The composite beam, with a T-cross section, represents a section of a floor element in a multi-storey CLT construction system. The shear connections used were made either of doublesided punched metal plate fasteners, either of inclined screws, or of a combination of both fastener types. The screws are used to secure the shear connection with double-sided nail plates with respect to possible separation forces between the glulam and the CLT. An additional test with a screw glued connection was made for comparison as the upper bound case in terms of composite action. The results show the beams with double-sided nail plates (with or without screws) achieved a very high level of composite action and an overall satisfactory behaviour. Almost full composite action was achieved for the screw-glued composite beam. A detailed design example of the beam element according to the Eurocode 5 and Finnish National Annex is presented.
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Experimental Analysis of Composite Timber-Concrete Wall Element

https://research.thinkwood.com/en/permalink/catalogue905
Year of Publication
2012
Topic
Design and Systems
Material
Timber-Concrete Composite
Application
Walls
Author
Hassan, Osama
Schedin, Staffan
Girhammar, Ulf
Year of Publication
2012
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Walls
Topic
Design and Systems
Keywords
Nail Plate
shear connectors
Conference
European Conference on Composite Materials
Research Status
Complete
Notes
June 24-28, 2012, Venice, Italy
Summary
The authors present an experimental and theoretical study on a composite or hybrid element used in residential and agricultural buildings. The composite wall element consists of timber studs connected to a concrete plate by means of nail plate shear connectors. Experimental results are presented and compared with an analytical model for partial composite action. A good agreement is obtained between the analytical and experimental results. Also, some suggestions to improve the design of the composite element are discussed.
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From file to factory: Innovative design solutions for multi-storey timber buildings applied to project Zembla in Kalmar, Sweden

https://research.thinkwood.com/en/permalink/catalogue3055
Year of Publication
2019
Topic
Design and Systems
Author
Kaiser, Alex
Larsson, Magnus
Girhammar, Ulf Arne
Organization
Luleå University of Technology
Publisher
Elsevier
Year of Publication
2019
Format
Journal Article
Topic
Design and Systems
Keywords
Multi-Storey Timber Building
File-to-factory
Modular Systems
Grid Shells
Slotting
Living Capsules
Research Status
Complete
Series
Frontiers of Architectural Research
Summary
A “file-to-factory” process of computer technology is a way to both maximise efficiency throughout the building process, increase a building s performance, and be able to add interesting architectural possibilities throughout the design phase. The authors investigate a novel approach that produces a set of building trajectories rather than a set of buildings, yet yields a series of build-able examples of those trajectories. This paper evaluates how this series of stacked multi-storey timber buildings can be both incorporated within a file-to-factory process, and give rise to creating new innovative solutions throughout the entire design and manufacturing process. This process is applied to a real Swedish project called Zembla. It redefines the notion of sprawl, turning it into a progressive tactics for linking the city fabric to rural areas. It is a post-sustainable file-to-factory-produced timber ground-scraper; soaring above ground and water, suggesting a new way of making city-sized buildings for the future. A plug-in grid-shell structure is designed to contain a minimal amount of timber elements, beams make up the lattice, cross-laminated panels add structural support, surfaces come together to form the living capsules. Having the structure undulate across the topography and touching the ground in as few places as possible uses the dichotomy between landscape and urbanism, bringing the city to the people living in less densified areas. Each living unit is customised to its topological conditions within the grid.
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On the Shear Buckling of Clamped Narrow Rectangular Orthotropic Plates

https://research.thinkwood.com/en/permalink/catalogue914
Year of Publication
2015
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Author
Atashipour, Seyed
Girhammar, Ulf
Publisher
Hindawi Publishing Corporation
Year of Publication
2015
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Topic
Mechanical Properties
Keywords
Classical Plate Theory
Finite Element
Uniformly Distributed Load
Modification Factor
Critical Buckling Load
Research Status
Complete
Series
Mathematical Problems in Engineering
Summary
This paper deals with stability analysis of clamped rectangular orthotropic thin plates subjected to uniformly distributed shear load around the edges. Due to the nature of this problem, it is impossible to present mathematically exact analytical solution for the governing differential equations. Consequently, all existing studies in the literature have been performed by means of different numerical approaches. Here, a closed-form approach is presented for simple and fast prediction of the critical buckling load of clamped narrow rectangular orthotropic thin plates. Next, a practical modification factor is proposed to extend the validity of the obtained results for a wide range of plate aspect ratios. To demonstrate the efficiency and reliability of the proposed closed-form formulas, an accurate computational code is developed based on the classical plate theory (CPT) by means of differential quadrature method (DQM) for comparison purposes. Moreover, several finite element (FE) simulations are performed via ANSYS software. It is shown that simplicity, high accuracy, and rapid prediction of the critical load for different values of the plate aspect ratio and for a wide range of effective geometric and mechanical parameters are the main advantages of the proposed closed-form formulas over other existing studies in the literature for the same problem.
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Free
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Structural Robustness and Timber Buildings - A Review

https://research.thinkwood.com/en/permalink/catalogue2173
Year of Publication
2019
Topic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Light Frame (Lumber+Panels)
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Huber, Johannes
Ekevad, Mats
Girhammar, Ulf
Berg, Sven
Organization
Luleå University of Technology
Publisher
Taylor&Francis Online
Year of Publication
2019
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Light Frame (Lumber+Panels)
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Robustness
Disproportionate Collapse
Progressive Collapse
Alternative Load Path
Damage Tolerance
Research Status
Complete
Series
Wood Material Science & Engineering
Summary
Timber buildings are increasing in their dimensions. Structural robustness is imperative for all buildings and specifically important for tall buildings. Lives can be saved if disproportionate collapse can be avoided after a catastrophic event (e.g. accident, terrorism). The literature about robustness is comprehensive concerning concrete and steel buildings, but is rather limited regarding timber. This paper reviews robustness in general and robustness of timber buildings in particular. Robustness is an intrinsic structural property, enhancing global tolerance to local failures, regardless of the cause. A deterministic approach to assess robustness is to remove certain load-bearing elements from the structure and compare the consequences to given limits. Design methods for robustness may be direct by assessing effects of local failure, or indirect by following guidelines. For robust timber buildings, the connections are the key aspects. Usually, metal connectors may provide the required joint ductility. For robust light timber-frame construction, rim beams may be designed. For timber posts and beams and cross laminated timber, guidance regarding robustness is scarce, but in some aspects they seem to be similar to steel frames and precast concrete. Future research should assess the capacity of connections, and evaluate the adequacy of seismic connectors for robust timber buildings.
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7 records – page 1 of 1.