Massimo Fragiacomo - Academia.edu (original) (raw)

Papers by Massimo Fragiacomo

Research paper thumbnail of Time-dependent behaviour of timber–concrete composite floors with prefabricated concrete slabs

Engineering Structures, 2013

ABSTRACT

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Research paper thumbnail of Seismic response of hybrid-LVL coupled walls under quasi-static and pseudo-dynamic testing

2007 NZSEE Conference ABSTRACT: Innovative seismic resisting connections for laminated veneer lum... more 2007 NZSEE Conference ABSTRACT: Innovative seismic resisting connections for laminated veneer lumber (LVL) timber multi-storey buildings have been recently presented by the authors, based on the combination of unbonded post-tensioning techniques and additional sources of dissipation. As part of an extensive research campaign underway at the University of Canterbury, alternatives solutions for beam-column subassemblies, wall-to-foundation and column-to-foundation connections have been developed, implemented and successfully tested under either quasi-static cyclic and pseudo-dynamic testing regimes. In this paper, the implementation and experimental validation, under both quasi-static cyclic and pseudo-dynamic testing protocols, of post-tensioned/dissipating coupled solid wall systems with different coupling configurations and dissipation devices (i.e. mild steel dissipaters and multi-nailed plywood sheets) is presented. The research investigations confirmed the high seismic performan...

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Research paper thumbnail of Feasibility and Detailing of Post-tensioned Timber Buildings for Seismic Areas

Paper 53 This paper describes the structural design and selection of construction detailing for l... more Paper 53 This paper describes the structural design and selection of construction detailing for low-rise multi-storey timber buildings using a new and exciting structural timber system. This system, originally developed for use with pre-cast concrete, combines the use of un-bonded post-tensioning techniques and additional sources of energy dissipation. This system eliminates residual displacement, while greatly reducing the damage to structural members during a significant seismic event. The paper shows how this new structural system can be used with large size structural timber members manufactured from laminated veneer lumber (LVL) or glulam timber, for use in multistorey buildings, with lateral load resistance provided by post-tensioned structural timber frames or walls, separately or in combination. An extensive on-going research program at the University of Canterbury, New Zealand has tested a wide range of beam-to-column, wall-to-foundation and column-to-foundation connections...

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Research paper thumbnail of Design and Construction of Prestressed Timber Buildings for Seismic Areas

This paper describes the structural design of low-rise multi-storey timber buildings using a new ... more This paper describes the structural design of low-rise multi-storey timber buildings using a new and exciting structural system. This system, originally developed for use with pre-cast concrete, combines un-bonded post-tensioning and additional energy dissipaters, providing a recentering capability after the earthquake, while great reducing the structural damage. This new structural system can be used in multi-storey buildings, with large structural timber members made from laminated veneer lumber (LVL) or glulam timber, with lateral loads resisted by prestressed timber frames or walls, separately or in combination. A case study of a six storey timber office building in a moderate seismic area is analysed and a virtual design development of many construction and connnection details for rapid construction. Total building cost is compared to equivalent steel and reinforced concrete options.

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Research paper thumbnail of Quasi-static cyclic tests on seismic-resistant beam-to-column and column-to-foundation subassemblies using Laminated Veneer Lumber (LVL)

This paper describes part of an extensive experimental programme in progress at the University of... more This paper describes part of an extensive experimental programme in progress at the University of Canterbury to develop Laminated Veneer Lumber (LVL) structural systems and connections for multistorey timber buildings in earthquake-prone areas. The higher mechanical properties of LVL, when compared to sawn timber, in addition to its low mass, flexibility of design and rapidity of construction, create the potential for increased use of LVL in multi-storey buildings. The development of these innovative ductile connections in LVL, proposed here for frame systems, have been based on the successful implementation of jointed ductile connections for precast concrete systems, started in the early 1990s with the PRESSS Program at the University of California, San Diego, further developed in Italy and currently under further refinement at the University of Canterbury. This paper investigates the seismic behaviour of the so-called “hybrid” connection, characterised by the combination of unbond...

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Research paper thumbnail of Buckling of 'Blockhaus' walls under in-plane vertical loads

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Research paper thumbnail of A buckling design approach for ‘Blockhaus’ timber walls under in-plane vertical loads

'Blockhaus' systems represent a traditional construction technology where structural resi... more 'Blockhaus' systems represent a traditional construction technology where structural resistance is attained by direct contact between multiple timber surfaces obtained via carvings, notches, and ancient carpentry joints. Although this technology is frequently used in practice for the construction of buildings (Fig.1), due to the complexity of various phenomena (loading perpendicular to the grain, effect of friction, influence of gaps in the joints, creep, etc.), their structural behavior under specific loading/boundary conditions is not completely known. The interaction between multiple logs, as well as the restraint effectiveness of carpentry timber joints and the anisotropy of timber, can strongly affect the load-carrying capacity of these structural systems [1][2][3][4]. The paper focuses on the assessment of the typical buckling behavior and resistance of vertically compressed timber-log walls. The effects of various mechanical and geometrical variables such as possible ...

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Research paper thumbnail of Stabilità dei sistemi strutturali log-haus

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Research paper thumbnail of Buckling behavior of 'Blockhaus' timber walls under in-plane vertical loads

'Blockhaus' structural systems represent a construction technology of ancient origins, wh... more 'Blockhaus' structural systems represent a construction technology of ancient origins, which is widely used in practice also for the construction of modern buildings. Their basic features consist in the optimization of multiple interactions between timber logs offered by notches, simple carpentry joints and contact surfaces. Despite these basic assembling techniques, however, their structural behavior is rather complex to describe, due to several mechanical and geometrical aspects. At the same time, current available standards for the design of timber structures do not provide analytical models for the appropriate verification of these structural systems. As a result, the capabilities of timber log-walls under specific loading and boundary conditions cannot be properly estimated. In this paper, preliminary results of ongoing research activity are presented and discussed for the buckling behavior of Blockhaus timber walls under in-plane vertical loads. The final aim of this c...

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Research paper thumbnail of Influence of connection properties on the ductility and seismic resistance of multi-storey cross-lam buildings

The paper focuses on the influence of modelling different types of connections in multi-storey cr... more The paper focuses on the influence of modelling different types of connections in multi-storey cross-lam timber buildings when performing a linear modal response spectrum analysis and nonlinear static analysis assessed with a modified N2 method. The main parameter that defines the response of a building when performing a linear modal analysis is its stiffness. As shown in the paper, the stiffness of cross-lam buildings is predominantly governed by the stiffness of the connections between timber panels. Since the connections of walls (angular brackets or hold-downs) behave non-symmetrically in the vertical direction being characterized by a rather low stiffness in tension compared to compression due to the contact, it is necessary to transform this non-linear wall-rocking behaviour into an equivalent linear behaviour that is required in the linear modal analysis. The paper provides some information on how to model this behaviour. By using a nonlinear static analysis and the N2 method...

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Research paper thumbnail of Comparison between rocking analysis and kinematic analysis for the dynamic out-of-plane behavior of masonry walls

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Research paper thumbnail of Prediction of the seismic response of “Blockhaus” shear walls under in-plane cyclic loads by means of experimental investigations and numerical simulations

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Research paper thumbnail of Moment Redistribution in Continuous Steel-Concrete Composite Beams with Compact Cross Section

Journal of Structural Engineering-asce, 2010

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Research paper thumbnail of Non-linear modelling of the in-plane seismic behaviour of timber Blockhaus log-walls

Engineering Structures, 2015

ABSTRACT Accepted, in print.

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Research paper thumbnail of Cyclic Behavior of CLT Wall Systems: Experimental Tests and Analytical Prediction Models

Journal of Structural Engineering, 2015

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Research paper thumbnail of Assessment of the structural stability of Blockhaus timber log-walls under in-plane compression via full-scale buckling experiments

Construction and Building Materials, 2015

ABSTRACT Blockhaus structural systems are obtained by assembling multiple timber logs able to int... more ABSTRACT Blockhaus structural systems are obtained by assembling multiple timber logs able to interact with each other by means of simple mechanisms (e.g. contacts, tongues and grooves, and carpentry joints, also referred to as ‘corner’ joints). Although these systems have ancient origins, the structural behaviour of Blockhaus systems under well-defined loading and boundary conditions is still complex to predict. The paper focuses on the assessment of the typical buckling behaviour and resistance of in-plane compressed timber log-walls. The effects of various mechanical and geometrical aspects such as in-plane rigid inter-storey floors, load eccentricities, different types of lateral restraints, openings (e.g. doors or windows) or additional metal stiffeners, are investigated by means of full-scale buckling experiments. Results are then critically discussed and preliminarily assessed via analytical formulations taken from classical theory of plate buckling and column buckling. Although further advanced studies are required for the development of a generalized buckling design method, it is shown that several mechanical and geometrical aspects should be properly taken into account to correctly predict the structural capacity of Blockhaus systems under in-plane compression.

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Research paper thumbnail of Design of Timber-Concrete Composite Floors for Fire Resistance

Journal of Structural Fire Engineering, 2011

Page 1. 231 Volume 2 · Number 3 · 2011 Design of Timber-Concrete Composite Floors for Fire Resist... more Page 1. 231 Volume 2 · Number 3 · 2011 Design of Timber-Concrete Composite Floors for Fire Resistance James W. O'Neill1, David Carradine2, Peter J. Moss3, Massimo Fragiacomo4, Rajesh Dhakal5 and Andrew H. Buchanan6 ...

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Research paper thumbnail of Multi-Storey Prestressed Timber Buildings in New Zealand

Structural Engineering International, 2008

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Research paper thumbnail of Cyclic behavior of typical screwed connections for cross-laminated (CLT) structures

European Journal of Wood and Wood Products, 2015

ABSTRACT This paper presents the results of an extensive experimental programme on typical cross-... more ABSTRACT This paper presents the results of an extensive experimental programme on typical cross-laminated timber (CLT) screwed connections conducted at CNR-IVALSA research institute. In-plane monotonic and cyclic shear and withdrawal tests were performed on screwed wall-to-wall, floor-to-floor and wall-to-floor CLT connections. Mechanical properties such as strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The experimental results showed good performance of CLT screwed joints under cyclic loads when ductile behaviour was achieved. Brittle response occurred only in cases where requirements for end and edge distances were not satisfied. The experimental characteristic shear strength and mean slip modulus of the connections were compared with values obtained using analytical design equations. The Eurocode 5 (EC5) formulas overestimated the characteristic strength values in some cases, while the Uibel and Blaß formulas specifically developed for CLT connections provided more accurate and conservative predictions. In cases where brittle failures were attained, the analytical values overestimated the experimental ones. This issue can be avoided when the requirements for minimum edge and end distances stated by EC5 are fulfilled. EC5 empirical formulas for the prediction of the screw connection slip modulus at serviceability limit state corresponded well with the experimental elastic values. The overstrength factor, which is of great importance in capacity-based design, was also evaluated, and a conservative value of 1.6 can be recommended for screwed CLT connections.

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Research paper thumbnail of Seismic analysis of an isolated and a non-isolated light-frame timber building using artificial and natural accelerograms

ABSTRACT Light-frame construction is used extensively for low and medium rise timber buildings. T... more ABSTRACT Light-frame construction is used extensively for low and medium rise timber buildings. These buildings are light-weight and have a high dissipative capacity which, on the other hand, may imply significant structural and non-structural damage at the end of a high intensity earthquake ground motion, leading to potentially significant economic losses. Passive base isolation is by far the most effective way to reduce the effect of an earthquake on a structure. In this paper, the use of Friction Pendulum System isolators is investigated for a three-storey light-frame timber building. Two designs of the same building, with and without passive base isolation, were carried out according to Eurocodes 5 and 8 and the Italian technical regulation for construction. The buildings were then analysed using linear and non-linear methods. The seismic performance and cost of both solutions are compared, demonstrating the convenience of using passive base isolation.

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Research paper thumbnail of Time-dependent behaviour of timber–concrete composite floors with prefabricated concrete slabs

Engineering Structures, 2013

ABSTRACT

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Research paper thumbnail of Seismic response of hybrid-LVL coupled walls under quasi-static and pseudo-dynamic testing

2007 NZSEE Conference ABSTRACT: Innovative seismic resisting connections for laminated veneer lum... more 2007 NZSEE Conference ABSTRACT: Innovative seismic resisting connections for laminated veneer lumber (LVL) timber multi-storey buildings have been recently presented by the authors, based on the combination of unbonded post-tensioning techniques and additional sources of dissipation. As part of an extensive research campaign underway at the University of Canterbury, alternatives solutions for beam-column subassemblies, wall-to-foundation and column-to-foundation connections have been developed, implemented and successfully tested under either quasi-static cyclic and pseudo-dynamic testing regimes. In this paper, the implementation and experimental validation, under both quasi-static cyclic and pseudo-dynamic testing protocols, of post-tensioned/dissipating coupled solid wall systems with different coupling configurations and dissipation devices (i.e. mild steel dissipaters and multi-nailed plywood sheets) is presented. The research investigations confirmed the high seismic performan...

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Research paper thumbnail of Feasibility and Detailing of Post-tensioned Timber Buildings for Seismic Areas

Paper 53 This paper describes the structural design and selection of construction detailing for l... more Paper 53 This paper describes the structural design and selection of construction detailing for low-rise multi-storey timber buildings using a new and exciting structural timber system. This system, originally developed for use with pre-cast concrete, combines the use of un-bonded post-tensioning techniques and additional sources of energy dissipation. This system eliminates residual displacement, while greatly reducing the damage to structural members during a significant seismic event. The paper shows how this new structural system can be used with large size structural timber members manufactured from laminated veneer lumber (LVL) or glulam timber, for use in multistorey buildings, with lateral load resistance provided by post-tensioned structural timber frames or walls, separately or in combination. An extensive on-going research program at the University of Canterbury, New Zealand has tested a wide range of beam-to-column, wall-to-foundation and column-to-foundation connections...

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Research paper thumbnail of Design and Construction of Prestressed Timber Buildings for Seismic Areas

This paper describes the structural design of low-rise multi-storey timber buildings using a new ... more This paper describes the structural design of low-rise multi-storey timber buildings using a new and exciting structural system. This system, originally developed for use with pre-cast concrete, combines un-bonded post-tensioning and additional energy dissipaters, providing a recentering capability after the earthquake, while great reducing the structural damage. This new structural system can be used in multi-storey buildings, with large structural timber members made from laminated veneer lumber (LVL) or glulam timber, with lateral loads resisted by prestressed timber frames or walls, separately or in combination. A case study of a six storey timber office building in a moderate seismic area is analysed and a virtual design development of many construction and connnection details for rapid construction. Total building cost is compared to equivalent steel and reinforced concrete options.

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Research paper thumbnail of Quasi-static cyclic tests on seismic-resistant beam-to-column and column-to-foundation subassemblies using Laminated Veneer Lumber (LVL)

This paper describes part of an extensive experimental programme in progress at the University of... more This paper describes part of an extensive experimental programme in progress at the University of Canterbury to develop Laminated Veneer Lumber (LVL) structural systems and connections for multistorey timber buildings in earthquake-prone areas. The higher mechanical properties of LVL, when compared to sawn timber, in addition to its low mass, flexibility of design and rapidity of construction, create the potential for increased use of LVL in multi-storey buildings. The development of these innovative ductile connections in LVL, proposed here for frame systems, have been based on the successful implementation of jointed ductile connections for precast concrete systems, started in the early 1990s with the PRESSS Program at the University of California, San Diego, further developed in Italy and currently under further refinement at the University of Canterbury. This paper investigates the seismic behaviour of the so-called “hybrid” connection, characterised by the combination of unbond...

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Research paper thumbnail of Buckling of 'Blockhaus' walls under in-plane vertical loads

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A buckling design approach for ‘Blockhaus’ timber walls under in-plane vertical loads

'Blockhaus' systems represent a traditional construction technology where structural resi... more 'Blockhaus' systems represent a traditional construction technology where structural resistance is attained by direct contact between multiple timber surfaces obtained via carvings, notches, and ancient carpentry joints. Although this technology is frequently used in practice for the construction of buildings (Fig.1), due to the complexity of various phenomena (loading perpendicular to the grain, effect of friction, influence of gaps in the joints, creep, etc.), their structural behavior under specific loading/boundary conditions is not completely known. The interaction between multiple logs, as well as the restraint effectiveness of carpentry timber joints and the anisotropy of timber, can strongly affect the load-carrying capacity of these structural systems [1][2][3][4]. The paper focuses on the assessment of the typical buckling behavior and resistance of vertically compressed timber-log walls. The effects of various mechanical and geometrical variables such as possible ...

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Research paper thumbnail of Stabilità dei sistemi strutturali log-haus

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Buckling behavior of 'Blockhaus' timber walls under in-plane vertical loads

'Blockhaus' structural systems represent a construction technology of ancient origins, wh... more 'Blockhaus' structural systems represent a construction technology of ancient origins, which is widely used in practice also for the construction of modern buildings. Their basic features consist in the optimization of multiple interactions between timber logs offered by notches, simple carpentry joints and contact surfaces. Despite these basic assembling techniques, however, their structural behavior is rather complex to describe, due to several mechanical and geometrical aspects. At the same time, current available standards for the design of timber structures do not provide analytical models for the appropriate verification of these structural systems. As a result, the capabilities of timber log-walls under specific loading and boundary conditions cannot be properly estimated. In this paper, preliminary results of ongoing research activity are presented and discussed for the buckling behavior of Blockhaus timber walls under in-plane vertical loads. The final aim of this c...

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Research paper thumbnail of Influence of connection properties on the ductility and seismic resistance of multi-storey cross-lam buildings

The paper focuses on the influence of modelling different types of connections in multi-storey cr... more The paper focuses on the influence of modelling different types of connections in multi-storey cross-lam timber buildings when performing a linear modal response spectrum analysis and nonlinear static analysis assessed with a modified N2 method. The main parameter that defines the response of a building when performing a linear modal analysis is its stiffness. As shown in the paper, the stiffness of cross-lam buildings is predominantly governed by the stiffness of the connections between timber panels. Since the connections of walls (angular brackets or hold-downs) behave non-symmetrically in the vertical direction being characterized by a rather low stiffness in tension compared to compression due to the contact, it is necessary to transform this non-linear wall-rocking behaviour into an equivalent linear behaviour that is required in the linear modal analysis. The paper provides some information on how to model this behaviour. By using a nonlinear static analysis and the N2 method...

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Research paper thumbnail of Comparison between rocking analysis and kinematic analysis for the dynamic out-of-plane behavior of masonry walls

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Prediction of the seismic response of “Blockhaus” shear walls under in-plane cyclic loads by means of experimental investigations and numerical simulations

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Moment Redistribution in Continuous Steel-Concrete Composite Beams with Compact Cross Section

Journal of Structural Engineering-asce, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Non-linear modelling of the in-plane seismic behaviour of timber Blockhaus log-walls

Engineering Structures, 2015

ABSTRACT Accepted, in print.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Cyclic Behavior of CLT Wall Systems: Experimental Tests and Analytical Prediction Models

Journal of Structural Engineering, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of the structural stability of Blockhaus timber log-walls under in-plane compression via full-scale buckling experiments

Construction and Building Materials, 2015

ABSTRACT Blockhaus structural systems are obtained by assembling multiple timber logs able to int... more ABSTRACT Blockhaus structural systems are obtained by assembling multiple timber logs able to interact with each other by means of simple mechanisms (e.g. contacts, tongues and grooves, and carpentry joints, also referred to as ‘corner’ joints). Although these systems have ancient origins, the structural behaviour of Blockhaus systems under well-defined loading and boundary conditions is still complex to predict. The paper focuses on the assessment of the typical buckling behaviour and resistance of in-plane compressed timber log-walls. The effects of various mechanical and geometrical aspects such as in-plane rigid inter-storey floors, load eccentricities, different types of lateral restraints, openings (e.g. doors or windows) or additional metal stiffeners, are investigated by means of full-scale buckling experiments. Results are then critically discussed and preliminarily assessed via analytical formulations taken from classical theory of plate buckling and column buckling. Although further advanced studies are required for the development of a generalized buckling design method, it is shown that several mechanical and geometrical aspects should be properly taken into account to correctly predict the structural capacity of Blockhaus systems under in-plane compression.

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Research paper thumbnail of Design of Timber-Concrete Composite Floors for Fire Resistance

Journal of Structural Fire Engineering, 2011

Page 1. 231 Volume 2 · Number 3 · 2011 Design of Timber-Concrete Composite Floors for Fire Resist... more Page 1. 231 Volume 2 · Number 3 · 2011 Design of Timber-Concrete Composite Floors for Fire Resistance James W. O'Neill1, David Carradine2, Peter J. Moss3, Massimo Fragiacomo4, Rajesh Dhakal5 and Andrew H. Buchanan6 ...

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Research paper thumbnail of Multi-Storey Prestressed Timber Buildings in New Zealand

Structural Engineering International, 2008

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Research paper thumbnail of Cyclic behavior of typical screwed connections for cross-laminated (CLT) structures

European Journal of Wood and Wood Products, 2015

ABSTRACT This paper presents the results of an extensive experimental programme on typical cross-... more ABSTRACT This paper presents the results of an extensive experimental programme on typical cross-laminated timber (CLT) screwed connections conducted at CNR-IVALSA research institute. In-plane monotonic and cyclic shear and withdrawal tests were performed on screwed wall-to-wall, floor-to-floor and wall-to-floor CLT connections. Mechanical properties such as strength, stiffness, energy dissipation, ductility ratio and impairment of strength were evaluated. The experimental results showed good performance of CLT screwed joints under cyclic loads when ductile behaviour was achieved. Brittle response occurred only in cases where requirements for end and edge distances were not satisfied. The experimental characteristic shear strength and mean slip modulus of the connections were compared with values obtained using analytical design equations. The Eurocode 5 (EC5) formulas overestimated the characteristic strength values in some cases, while the Uibel and Blaß formulas specifically developed for CLT connections provided more accurate and conservative predictions. In cases where brittle failures were attained, the analytical values overestimated the experimental ones. This issue can be avoided when the requirements for minimum edge and end distances stated by EC5 are fulfilled. EC5 empirical formulas for the prediction of the screw connection slip modulus at serviceability limit state corresponded well with the experimental elastic values. The overstrength factor, which is of great importance in capacity-based design, was also evaluated, and a conservative value of 1.6 can be recommended for screwed CLT connections.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Seismic analysis of an isolated and a non-isolated light-frame timber building using artificial and natural accelerograms

ABSTRACT Light-frame construction is used extensively for low and medium rise timber buildings. T... more ABSTRACT Light-frame construction is used extensively for low and medium rise timber buildings. These buildings are light-weight and have a high dissipative capacity which, on the other hand, may imply significant structural and non-structural damage at the end of a high intensity earthquake ground motion, leading to potentially significant economic losses. Passive base isolation is by far the most effective way to reduce the effect of an earthquake on a structure. In this paper, the use of Friction Pendulum System isolators is investigated for a three-storey light-frame timber building. Two designs of the same building, with and without passive base isolation, were carried out according to Eurocodes 5 and 8 and the Italian technical regulation for construction. The buildings were then analysed using linear and non-linear methods. The seismic performance and cost of both solutions are compared, demonstrating the convenience of using passive base isolation.

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