Connection System of Massive Timber Elements Used in Horizontal Slabs of Hybrid Tall Buildings

Asiz, Andi; Smith, Ian F. C.

doi:10.1061/(asce)st.1943-541x.0000363

Cited by 38 publications

(20 citation statements)

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“…The connection plates are fixed to the WQ-beam by two bolts Ds = 20 mm and this connection is supposed to be absolutely rigid. The stiffness of one screw is 1.33 N/mm according to [4] and ks = 2.66 kN/mm (topmost grain direction perpendicular to the load, two screws) and the ultimate shear resistance of one screw is 23.1 kN.…”

Section: Examplesmentioning

confidence: 99%

New Steel‐timber Composite Beam, Nordic System

et al. 2019

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The design of new steel‐timber composite beam, called Nordic system, is proposed. The beam consists of CLT (Cross Laminated Timber) slabs that are installed on the bottom flanges of an asymmetric welded steel box. The composite action is achieved through connection the slabs to the steel beam by steel plates which are screwed to the timber and bolted to the top flange of the beam. The composite action reduces the stresses of the steel beam compared to the pure steel beam without composite action. This means that there exists a large potential to search lightweight, dry slim floor, low emission and cost optimal solutions using this composite beam due to large variations for available steel grades of the welded beam, as has been shown previously for pure welded steel beams.

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Section: Examplesmentioning

confidence: 99%

New Steel‐timber Composite Beam, Nordic System

et al. 2019

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“…Table 2 shows the details of mechanical properties of concrete and CLT. The CLT-based floor is composed of many CLT panels connected to the reinforced concrete frames with long screws having adequate stiffness and spaced such that ensuring adequate force transfer between the CLT slab and concrete floor framing [3]. The interconnected CLT panels are also connected using screws to ensure adequate internal force transfer between panels.…”

Section: Modelingmentioning

confidence: 99%

“…Ref. [3]) and spaced at 200 mm. All building frames were modeled as fix to 27.5 f t-1 = 20, f t-2 = 15, f c-1 = 30, f c-2 = 25, f shear = 5 Notation: E = modulus of elasticity; G = modulus of rigidity; 1 = CLT major direction; 2 = CLT minor direction; t = tension; c = compression ensure extreme structural responses under lateral loads.…”

Section: Modelingmentioning

confidence: 99%

“…Hybrid here means that CLT can be used in combination with steel or reinforced concrete floor framing including lateral load resisting systems such as steel moment frame or reinforced concrete shear wall. From some of the research outcomes by Asiz and Smith [2][3][4], it has been shown that CLT slab as floor component is not only feasible for tall buildings with steel or reinforced concrete frameworks under extreme earthquake load, but it is also very competitive relative to reinforced concrete slab due to smaller drifts generated and low demand on the foundation loads. However, there are few challenges that need to be addressed in order to make CLT virtually unlimited use in tall building applications.…”

Section: Introductionmentioning

confidence: 99%

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Structural performance of hybrid multistorey buildings with massive timber-based floor elements loaded under extreme lateral loads

Ahmed¹,

Asiz²

2017

Int. J. CMEM

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Massive timber plate elements, specifically cross laminated timber (CLT), has gained popularity recently in North America as major alternative construction material for building components offering competitive advantages relative to traditional reinforced concrete slab for medium rise applications. There are two major structural applications for this kind of timber plate, as floor slab or shear wall components of multi-storey buildings. The following study will be focused on the structural performance of hybrid multi-storey buildings constructed using CLT plate as the floor slab elements. The specific objective of this paper is to investigate lateral deformability of floor diaphragm that is composed of CLT slab in combination with reinforced concrete and steel floor framing loaded under seismic excitation. Critical irregular floor layouts of medium rise buildings are selected and modeled using computer structural and building analysis software ETABS. Major outputs including lateral floor deformation (drift), storey shear and dynamic characteristic analyses are analyzed and contrasted with the current design practices, i.e. building code application with respect to diaphragm assumption for seismic design. As in the reinforced concrete-based floor diaphragm, expected general outcome from this study is to provide input for design code provision regarding whether rigid, flexible, or in-between (semi-rigid) assumption of CLT-based diaphragm is adequate for performing design standard procedure for seismic design of hybrid multi-storey buildings. Structural analysis and modeling challenges for CLT-based diaphragm used in hybrid multi-storey buildings are presented and design recommendations will be given.

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“…With reduced floor mass, the superstructure itself requires smaller sections as the dead load is reduced, so less steel is needed overall, and also the foundations can be smaller and simpler. Research by Asiz & Smith has shown that CLT panels can be secured to steel with simple screw fasteners [2] 2 , so construction can be a quick, simple and a dry process. All these factors combine to make the proposed system potentially a much more efficient construction method, in terms of time, cost and environmental impact.…”

Section: Introductionmentioning

confidence: 99%

19.05: CLT‐steel composite slimfloor construction: An investigation of mechanical behaviour using finite element software

Okutu¹,

Davison

Carr

2017

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A new method of constructing multi-storey buildings has been investigated using Cross-Laminated Timber (CLT) panels acting as floor slabs with a steel framed support structure. Conventionally, concrete slabs are used for floor systems but timber panels weigh approximately one third of the equivalent concrete slabs, and hence the superstructure mass is significantly reduced, smaller sections can be used and thus less steel is needed overall. Further economy can be gained if composite action that can be generated between the CLT flooring and supporting steel beams. This paper presents the findings of a detailed finite element study to examine the composite performance of steel-CLT beams taking into account the method and degree of shear interaction, the determination of a suitable effective to width to account for shear lag, the position of the CLT relative to the beam (i.e. above the beam as in conventional composite construction or within the beam depth to form a slimfloor type system) and the layup and orientation of the laminations in the floor units. After briefly outlining the advantages of using a CLT-steel hybrid system, this paper explains how a detailed numerical model which captures the key features of the system was developed and validated and then present the results of a parametric investigation into the generation of composite action in a CLT-steel hybrid system.

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Connection System of Massive Timber Elements Used in Horizontal Slabs of Hybrid Tall Buildings

Cited by 38 publications

References 1 publication

New Steel‐timber Composite Beam, Nordic System

New Steel‐timber Composite Beam, Nordic System

Structural performance of hybrid multistorey buildings with massive timber-based floor elements loaded under extreme lateral loads

19.05: CLT‐steel composite slimfloor construction: An investigation of mechanical behaviour using finite element software

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