Investigating The Response Of Bolted Wood Connections Subjected To Bast Loads
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Investigating The Response Of Bolted Wood Connections Subjected To Bast Loads
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Author : Andrew McGrath
language : en
Publisher:
Release Date : 2020
Investigating The Response Of Bolted Wood Connections Subjected To Bast Loads written by Andrew McGrath and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
With recent improvement in wood manufacturing technologies, taller and larger wooden structures are being constructed, thereby increasing the risk for potential damage due to a blast threat against such structures. Recent studies on the effects of high strain rate in wood have been undertaken, however the vast majority of these studies have focussed on structural elements with idealized boundary conditions. Some studies included realistic connections as the boundary conditions, but little progress has been made to date in order to quantify the behaviour of connections in isolation. The current study aims to investigate the response of steel-wood-steel bolted connections when subjected to blast loads. This includes determining the dynamic increase in resistance and stiffness for stocky and slender bolts in both the parallel and perpendicular to grain directions. The study also explores analytical solutions to predict the joint behaviour and discusses the validity of current blast design provisions. Bolted wood connections were investigated under both static and simulated blast loading using the University of Ottawa's shock tube. The study found a dynamic increase in resistance and stiffness when the failure mode was dominated by wood crushing in both the parallel and perpendicular to grain directions. No increase in resistance or stiffness was observed when bolt yielding dominated the failure. A loss of ductility was observed under dynamic loading for the parallel to the grain connections designed to fail in wood crushing. It was found that the use of self-tapping screw reinforcement was an effective method of preventing premature splitting failures and enhancing the performance of a connection. The results showed that connections which engaged the fastener in bending exhibited more favourable behaviour than connections which engaged only in wood crushing. A two degree-of-freedom model was capable of modelling the connections even when the support frame system had some flexibility. The validated model was used to investigate cases where the connection could contribute to the energy dissipation. It was found that the performance of the assembly improved when the connections were considered. Recommended future work includes an investigation of brittle failure modes in bolted connections, exploring connections with more deformation capacities, and expanding the experimental component of the study to include full-scale structural assemblies with wood elements and boundary connections. Limited design recommendations have been proposed in the current study, however testing at the assembly level could shed more light on such an important topic.
Investigation And Optimization Of Connections In Timber Assemblies Subjected To Blast Loading
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Author : Christian Viau
language : en
Publisher:
Release Date : 2020
Investigation And Optimization Of Connections In Timber Assemblies Subjected To Blast Loading written by Christian Viau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The majority of research on high strain-rate effects in timber structures has been limited to the study of the load-bearing members in isolation. Limited work has been conducted on timber connections and full-scale timber assemblies under blast loading, and these have generally been constrained to qualitative observations. In North America, the increasing prevalence of mid- and high-rise timber structures makes them susceptible to blast effects. In addition, questions remain on how to design and optimize these timber assemblies, including the connections, against blast loads, due in part to the limitations on comprehensive design provisions. The effects of far-field blast explosions were simulated using the University of Ottawa shock tube. A total of fifty-eight dynamic tests were conducted on connection-level and full-scale specimens. The research program aimed to investigate the behaviour of heavy-timber connections when subjected to simulated blast loads. The experimental results showed that connections with a main failure mechanism consisting of wood crushing experienced significant increases in dynamic peak load when compared to the static peak load. In contrast, connections where steel yielding and rupturing occurred experienced no statistically significant increase in dynamic peak load. Full-scale glulam specimens with bolted connections designed to yield via wood crushing and bolt bending performed better than those with overdesigned connections. Bolted connections which failed in splitting led to premature failure of the glulam assembly. Reinforcement with self-tapping screws allowed these bolted joints to fail in a combination of bolt yielding and wood crushing, and provided more ductility when compared to unreinforced specimens. Specially designed energy-absorbing connections significantly increased the energy dissipation capabilities of the timber assemblies. The basis of these connections was to allow for connection yielding while delaying failure of the wood member. This was achieved via elastoplastic connection behaviour, which effectively limited the load imparted onto the wood member. Based on the experimental results, limitations in the current Canadian blast provisions were highlighted and discussed. A two-degree-of-freedom blast analysis software was developed and validated using full-scale and connection-level experimental results and was found to adequately capture the system response with reasonable accuracy. Sensitivity analyses regarding the applicability of using single-degree-of-freedom analysis were presented and discussed.
Feasibility Of Fiberglass Reinforced Bolted Wood Connections
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Author : Daniel F. Windorski
language : en
Publisher:
Release Date : 1997
Feasibility Of Fiberglass Reinforced Bolted Wood Connections written by Daniel F. Windorski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
On The State Of The World At The Christian Epoch
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Author :
language : en
Publisher:
Release Date : 18??
On The State Of The World At The Christian Epoch written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 18?? with Church and the world categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1991
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Mechanics, Applied categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2003
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Dissertations, Academic categories.
Bulletin Of The New Zealand National Society For Earthquake Engineering
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Author : New Zealand National Society for Earthquake Engineering
language : en
Publisher:
Release Date : 1985
Bulletin Of The New Zealand National Society For Earthquake Engineering written by New Zealand National Society for Earthquake Engineering and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Buildings categories.
Materials And Joints In Timber Structures
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Author : Simon Aicher
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-09-25
Materials And Joints In Timber Structures written by Simon Aicher and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-25 with Technology & Engineering categories.
This book contains the contributions from the RILEM International Symposium on Materials and Joints in Timber Structures that was held in Stuttgart, Germany from October 8 to 10, 2013. It covers recent developments in the materials and the joints used in modern timber structures. Regarding basic wooden materials, the contributions highlight the widened spectrum of products comprising cross-laminated timber, glulam and LVL from hardwoods and block glued elements. Timber concrete compounds, cement bonded wood composites and innovative light-weight constructions represent increasingly employed alternatives for floors, bridges and facades. With regard to jointing technologies, considerable advances in both mechanical connections and glued joints are presented. Self-tapping screws have created unprecedented options for reliable, strong as well as ductile joints and reinforcement technologies. Regarding adhesives, which constitute the basis of the jointing/laminating technology of modern timber products, extended options for tailor-made bonding solutions have to be stated. Apart from melamine-urea and phenolic-resorcinol adhesives, one-component-polyurethanes, emulsion isocyanate polymers and epoxies offer a wide range of possibilities. The contributions dealing with experimental and numerical investigations on static, cyclic and seismic behavior of structures clearly reveal the enhanced potential of modern timber construction for reliable and sustainable buildings and bridges of the new millennium. The book is structured in nine thematic areas, being I) Structures II) Mechanical Connections III) Glued Joints and Adhesives IV) Timber and Concrete/Cement/Polymer Composites V) Cyclic, Seismic Behavior VI) Hardwood, Modified Wood and Bamboo VII) Cross-Laminated Timber VIII) Properties and Testing of Wood IX) Glulam
Guide To Design Criteria For Bolted And Riveted Joints
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Author : Geoffrey L. Kulak
language : en
Publisher: Wiley-Interscience
Release Date : 1987-04-14
Guide To Design Criteria For Bolted And Riveted Joints written by Geoffrey L. Kulak and has been published by Wiley-Interscience this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-04-14 with Architecture categories.
This updated version of the first edition examines the strength and deformation behaviour of riveted and bolted structural connectors and the joints in which they are used.
Dowel Bearing Strength
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Author : Thomas Lee Wilkinson
language : en
Publisher:
Release Date : 1991
Dowel Bearing Strength written by Thomas Lee Wilkinson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Dowels categories.