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Numerical Study of Alternative Seismic-Resisting Systems for CLT Buildings

https://research.thinkwood.com/en/permalink/catalogue2176
Year of Publication
2018
Topic
Connections
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls
Shear Walls

Ambient and Forced Vibration Testing and Finite Element Model Updating of a Full-Scale Posttensioned Laminated Veneer Lumber Building

https://research.thinkwood.com/en/permalink/catalogue1103
Year of Publication
2012
Topic
Seismic
Wind
Acoustics and Vibration
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Shear Walls
Author
Worth, Margaret
Omenzetter, Piotr
Morris, Hugh
Year of Publication
2012
Country of Publication
New Zealand
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Shear Walls
Topic
Seismic
Wind
Acoustics and Vibration
Keywords
Post-Tensioned
Full Scale
In Situ
Finite Element Model
Dynamic Performance
Language
English
Conference
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 13-15, 2012, Christchurch, New Zealand
Summary
The Nelson Marlborough Institute of Technology Arts and Media building was completed in 2011 and consists of three seismically separate complexes. This research focussed on the Arts building as it showcases the use of coupled post-tensioned timber shear walls. These are part of the innovative Expan system. Full-scale, in-situ dynamic testing of the novel building was combined with finite element modelling and updating to obtain an understanding of the structural dynamic performance within the linear range. Ambient testing was performed at three stages during construction and was combined with forced vibration testing for the final stage. This forms part of a larger instrumentation program developed to investigate the wind and seismic response and long term deformations of the building. A finite element model of the building was formulated and updated using experimental modal characteristics. It was shown that the addition of non-structural elements, such as cladding and the staircase, increased the natural frequency of the first mode and the second mode by 19% and 24%, respectively. The addition of the concrete floor topping as a structural diaphragm significantly increased the natural frequency of the first mode but not the second mode, with an increase of 123% and 18%, respectively. The elastic damping of the NMIT building at low-level vibrations was identified as being between 1.6% and 2.4%
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Seismic Design of Cross-Laminated Timber Platform Buildings Using a Coupled Shearwall Concept

https://research.thinkwood.com/en/permalink/catalogue1245
Year of Publication
2017
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Wood Building Systems
Floors
Author
Pei, Shiling
Lenon, Conor
Kingsley, Gregory
Deng, Peng
Publisher
American Society of Civil Engineers
Year of Publication
2017
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Wood Building Systems
Floors
Topic
Design and Systems
Seismic
Keywords
Coupling
Language
English
Research Status
Complete
Series
Journal of Architectural Engineering
Summary
Cross-laminated timber (CLT) is an engineered wood material that was introduced in the last decade as a promising candidate for building wood structures higher than 10 stories. Thus far, a handful of tall residential CLT buildings have been built in low seismic regions around the world. Previous full-scale seismic shaking table tests of multistory CLT buildings revealed that this system is susceptible to overturning damage as a result of lateral seismic loads. To effectively resist overturning, a new floor connection detail was proposed to engage CLT floor panels as coupling elements for CLT shearwall stacks in the building floor plan. This approach is fundamentally different from traditional isolated shearwall stack design methods used in multistory light-framed wood buildings. The proposed method was illustrated through the seismic design of a 12-story CLT building located in Los Angeles, California, which was then subjected to the design equivalent lateral force to evaluate the conservativeness in the proposed simplified calculation.
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Lateral Load-Resisting System Using Mass Timber Panel for High-Rise Buildings

https://research.thinkwood.com/en/permalink/catalogue1221
Year of Publication
2017
Topic
Seismic
Wind
Design and Systems
Material
LSL (Laminated Strand Lumber)
Application
Shear Walls
Hybrid Building Systems
Author
Chen, Zhiyong
Chui, Ying-hei
Publisher
Frontiers Media
Year of Publication
2017
Country of Publication
Switzerland
Format
Journal Article
Material
LSL (Laminated Strand Lumber)
Application
Shear Walls
Hybrid Building Systems
Topic
Seismic
Wind
Design and Systems
Keywords
Lateral Load Resisting System
High-Rise
Dowel-Type Connections
FE model
Linear Static Analysis
Non-linear Dynamic Analysis
Timber-Steel Hybrid
Language
English
Research Status
Complete
Series
Frontiers in Built Environment
Summary
As global interest in using engineered wood products in tall buildings intensifies due to the “green” credential of wood, it is expected that more tall wood buildings will be designed and constructed in the coming years. This, however, brings new challenges to the designers. One of the major challenges is how to design lateral load-resisting systems (LLRSs) with sufficient stiffness, strength, and ductility to resist strong wind and earthquakes. In this study, an LLRS using mass timber panel on a stiff podium was developed for high-rise buildings in accordance with capacity-based design principle. The LLRS comprises eight shear walls with a core in the center of the building, which was constructed with structural composite lumber and connected with dowel-type connections and wood–steel composite system. The main energy dissipating mechanism of the LLRS was detailed to be located at the panel-to-panel interface. This LLRS was implemented in the design of a hypothetical 20-storey building. A finite element (FE) model of the building was developed using general-purpose FE software, ABAQUS. The wind-induced and seismic response of the building model was investigated by performing linear static and non-linear dynamic analyses. The analysis results showed that the proposed LLRS using mass timber was suitable for high-rise buildings. This study provided a valuable insight into the structural performance of LLRS constructed with mass timber panels as a viable option to steel and concrete for high-rise buildings.
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Seismic Design of Mixed CLT/Light-Frame Multi-Storey Buildings

https://research.thinkwood.com/en/permalink/catalogue1666
Year of Publication
2016
Topic
Seismic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Shear Walls
Author
Follesa, Maurizio
Fragiacomo, Massimo
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Shear Walls
Topic
Seismic
Mechanical Properties
Keywords
Multi-Storey
Q Factor
Eurocode 8
Nonlinear Time History Analysis
Dynamic Analysis
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3750-3759
Summary
This paper presents a study on the seismic design of hybrid multi-storey wood buildings made of CLT and Light-Frame shear walls acting at the same level. Within the framework of the force-based method, the aim of this study is to propose a simple formulation in order to establish the value of the q-factor of the hybrid system which could be also implemented in seismic design codes such as Eurocode 8. This was achieved by analysing the results of nonlinear dynamic (time-history) analyses performed on a four storey case-study building with different combinations of CLT and Light-Frame shear walls.
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Performance of Cross-Laminated Timber Shear Walls for Platform Construction Under Lateral Loading

https://research.thinkwood.com/en/permalink/catalogue1268
Year of Publication
2018
Topic
Seismic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Shahnewaz, Md
Organization
University of British Columbia
Year of Publication
2018
Country of Publication
Canada
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Seismic
Connections
Keywords
Lateral Loading
In-Plane Stiffness
Platform Buildings
Openings
Thickness
Aspect Ratios
Language
English
Research Status
Complete
Summary
Cross-laminated timber (CLT) is gaining popularity in residential and non-residential applications in the North American construction market. CLT is very effective in resisting lateral forces resulting from wind and seismic loads. This research investigated the in-plane performance of CLT shear wall for platform-type buildings under lateral loading. Analytical models were proposed to estimate the in-plane stiffness of CLT wall panels with openings based on experimental and numerical investigations. The models estimate the in-plane stiffness under consideration of panel thickness, aspect ratios, and size and location of the openings. A sensitivity analysis was conducted to reduce the number of model parameters to those that have a significant impact on the stiffness reduction of CLT wall panels with openings. Finite element models of CLT wall connections were developed and calibrated against experimental tests. The results were incorporated into models of CLT single and coupled shear walls. Finite element analyses were conducted on CLT shear walls and the results in terms of peak displacements, peak loads and energy dissipation were in good agreement when compared against full-scale shear wall tests. A parametric study on single and coupled CLT shear walls was conducted with variation of number and type of connectors. The seismic performance of 56-single and 40-coupled CLT shear walls’ assembles for platform-type construction were evaluated. Deflection formulas were proposed for both single and coupled CLT shear walls loaded laterally in-plane that in addition to the contributions of CLT panels and connections, also account for the influence of adjacent perpendicular walls and floors above and illustrated with examples. Analytical equations were proposed to calculate the resistance of CLT shear walls accounting for the kinematic behaviour of the walls observed in experimental investigations (sliding, rocking and combined sliding-rocking) and illustrated with examples. Different configurations (number and location of hold-downs) of single and coupled CLT walls were considered. The findings presented in this thesis will contribute to the scientific body of knowledge and furthermore will be a useful tool for practitioners for the successful seismic design of CLT platform buildings in-line with the current CSA O86 provisions.
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Hybrid System of Unbonded Post-Tensioned CLT Panels and Light-Frame Wood Shear Walls

https://research.thinkwood.com/en/permalink/catalogue757
Year of Publication
2017
Topic
Design and Systems
Mechanical Properties
Seismic
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Author
Ho, Tu Xuan
Dao, Thang
Aaleti, Sriram
van de Lindt, John
Rammer, Douglas
Publisher
American Society of Civil Engineers
Year of Publication
2017
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Shear Walls
Topic
Design and Systems
Mechanical Properties
Seismic
Keywords
Post-Tensioned
Cyclic Loadings
Dynamic Analysis
Numerical model
Language
English
Research Status
Complete
Series
Journal of Structural Engineering
Summary
Cross-laminated timber (CLT) is a relatively new type of massive timber system that has shown to possess excellent mechanical properties and structural behavior in building construction. When post-tensioned with high-strength tendons, CLT panels perform well under cyclic loadings because of two key characteristics: their rocking behavior and self-centering capacity. Although post-tensioned rocking CLT panels can carry heavy gravity loads, resist lateral loads, and self-center after a seismic event, they are heavy and form a pinched hysteresis, thereby limiting energy dissipation. Conversely, conventional light-frame wood shear walls (LiFS) provide a large amount of energy dissipation from fastener slip and, as their name implies, are lightweight, thereby reducing inertial forces during earthquakes. The combination of these different lateral behaviors can help improve the performance of buildings during strong ground shaking, but issues of deformation compatibility exist. This study presents the results of a numerical study to examine the behavior of post-tensioned CLT walls under cyclic loadings. A well-known 10-parameter model was applied to simulate the performance of a CLT-LiFS hybrid system. The posttensioned CLT wall model was designed on the basis of a modified monolithic beam analogy that was originally developed for precast concrete-jointed ductile connections. Several tests on post-tensioned CLT panels and hybrid walls were implemented at the Large Scale Structural Lab at the University of Alabama to validate the numerical model, and the results showed very good agreement with the numerical model. Finally, incremental dynamic analysis on system level models was compared with conventional light-frame wood system models.
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Design Example: Design of Stacked Multi-Storey Wood Shear Walls Using a Mechanics Based Approach

https://research.thinkwood.com/en/permalink/catalogue739
Year of Publication
2013
Topic
Design and Systems
Mechanical Properties
Seismic
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Shear Walls
Author
Newfield, Grant
Ni, Chun
Wang, Jasmine
Organization
Canadian Wood Council
FPInnovations
Year of Publication
2013
Country of Publication
Canada
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Shear Walls
Topic
Design and Systems
Mechanical Properties
Seismic
Keywords
Codes
National Building Code of Canada
Lateral Seismic Loads
Language
English
Research Status
Complete
Summary
Figure 1 shows a floor plan and elevation along with the preliminary shear wall locations for a sixstorey wood-frame building. It is assumed some preliminary calculations have been provided to determine the approximate length of wall required to resist the lateral seismic loads. If the preliminary design could not meet the drift limit requirement using the base shear obtained based on the actual period, the shear walls should be re-designed until the drift limit requirement is satisfied.
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Innovative Construction System for Sustainable Buildings

https://research.thinkwood.com/en/permalink/catalogue140
Year of Publication
2015
Topic
Cost
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Floors
Shear Walls
Author
Loss, Cristiano
Piazza, Maurizio
Zandonini, Riccardo
Year of Publication
2015
Country of Publication
Switzerland
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Floors
Shear Walls
Topic
Cost
Design and Systems
Keywords
Prefabrication
Residential
Timber-Steel Hybrid
Numerical Analysis
Multi-Storey
Joints
Language
English
Conference
International Association for Bridge and Structural Engineering Conference
Research Status
Complete
Notes
September 23-25, 2015, Geneva, Switzerland
Summary
This paper deals with a contemporary integrated and sustainable construction technology for new residential buildings. Specifically, this research aims at developing innovative steel-timber hybrid structures which allow a rapid assembly of the individual prefabricated components, minimizing the construction times and limiting the costs of the work. The numerical analyses performed on a multi-storey building for social housing will be presented and discussed. The in-plane behaviour of the floors and shear walls will be analysed, considering in particular the types and arrangement of the different timber- and steel-timber joints. The connections to be used among the construction elements will be selected in order to develop a sufficient stiffness, ductility and bearing capacity according to the design criteria for seismic-resistant structures. These connections allow to enhance the on-site assembly operations, therefore working effectively also under harsh climatic conditions.
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Free
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Comparison of the Seismic Performance of Different Hybrid Timber-Steel Frame Configurations

https://research.thinkwood.com/en/permalink/catalogue1775
Year of Publication
2016
Topic
Seismic
Design and Systems
Application
Hybrid Building Systems
Shear Walls
Author
Marin, Jose Alberto
He, Minjuan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Application
Hybrid Building Systems
Shear Walls
Topic
Seismic
Design and Systems
Keywords
Finite Element Model
Timber-Steel Hybrid
Deformation
Lateral Loading
Abaqus
Displacement
Inter-Story Drift
Diaphragm
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 5401-5408
Summary
This paper presents a finite element modeling case study of three different designs of hybrid timber-steel 6-story buildings. One of the buildings is composed by steel frames and timber diaphragms while the other two cases consist of the initial design with timber shear walls added in different dispositions, one with outer walls and the other...
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10 records – page 1 of 1.