Prediction of motion responses of cross-laminated-timber slabs

Ussher, Ebenezer; Arjomandi, Kaveh; Weckendorf, Jan; Smith, Ian F. C.

doi:10.1016/j.istruc.2017.04.007

Cited by 18 publications

(8 citation statements)

References 11 publications

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“…Previous studies have investigated GHG emissions and economic factors related to the use of CLT in building construction [14][15][16][17][18][19][20] and the technical aspects of using CLT slabs [21,22]. However, the use of CLT slabs in civil structures such as bridges and the environmental and economic impacts of such projects have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Considering these advantages, it may be possible to refurbish the decks of aging bridges without reinforcing the girder or abutment by using lightweight CLT floor slabs of appropriate size (Figure 1) [12]. This is expected to reduce greenhouse gas (GHG) emissions and the economic burden on local governments.Previous studies have investigated GHG emissions and economic factors related to the use of CLT in building construction [14-20] and the technical aspects of using CLT slabs [21,22]. However, the use of CLT slabs in civil structures such as bridges and the environmental and economic impacts of such projects have not been investigated.We evaluated the GHG emissions of small-scale bridge repair in Akita Prefecture using CLT slabs as well as its associated costs, as determined by life-cycle assessment (LCA), as an example of the first use of CLT in civil engineering projects in Japan.…”

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confidence: 99%

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Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

Iwase

Sasaki

Araki³

et al. 2020

Sustainability

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Cross-laminated timber (CLT) has gained popularity worldwide in recent years, and its use in buildings and civil engineering structures has attracted attention in Japan. In this study, the life-cycle greenhouse gas (GHG) balance and costs associated with CLT floor slabs were evaluated with respect to small-scale bridge repair as the first instance of the use of CLT in civil engineering projects in Japan. Additionally, waterproofing treatment was applied to CLT slabs, and the potential GHG and cost reduction of CLT in comparison with reinforced concrete (RC) slabs were examined. GHG emissions were the smallest for non-waterproofed CLT slabs and the greatest for RC slabs. When replacing RC slabs with CLT slabs without waterproofing, fossil-derived GHG emissions can be reduced by 73 kg-CO2eq/m2 per slab, and fossil/wood-derived GHG emissions can be reduced by 67 kg-CO2eq/m2; however, the use of disposed CLT as fuel is essential. Moreover, a reduction in GHG emissions can be expected if RC slabs are replaced with CLT slabs that are waterproofed only once every 20 years. Further, the cost associated with RC slabs is 20% of that attributable to CLT slabs. Hence, measures need to be taken to reduce the cost of CLT and waterproofing materials.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

Iwase

Sasaki

Araki³

et al. 2020

Sustainability

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“…The same material was assigned to each layer, except that the in-plan material orientation assignments were 90 • oriented from the adjacent layer to mimic the cross-laminate layers of CLT panel. The material properties of CLT were gathered from the literature [24,25], reported in Table 2. The meshes of 20-node quadratic brick, reduced integration (C3D20R) quadratic type were assigned to the entire model.…”

Section: Model Descriptionmentioning

confidence: 99%

Development of a Vibroacoustic Stochastic Finite Element Prediction Tool for a CLT Floor

et al. 2019

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Low frequency impact sound insulation is a challenging task in wooden buildings. Low frequency prediction tools are needed to access the dynamic behavior of a wooden floor in an early design phase to ultimately reduce the low frequency impact noise. However, due to the complexity of wood and different structural details, accurate vibration predictions of wood structures are difficult to attain. Meanwhile, a deterministic model cannot properly represent the real case due to the uncertainties coming from the material properties and geometrical changes. The stochastic approach introduced in this paper aims at quantifying the uncertainties induced by material properties and proposing an alternative calibration method to obtain a relative accurate result instead of the conventional manual calibration. In addition, 100 simulations were calculated in different excitation positions to assess the uncertainties induced by material properties of cross-laminated-timber A comparison between the simulated and measured results was made in order to extract the best combination of Young’s moduli and shear moduli in different directions of the CLT panel.

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“…Advances in building construction technology and design have enabled the use of lighter, more structurally-and environmentally-efficient materials such as laminated timber [1,2,3]. However, the increase in popularity of lightweight wooden buildings has been accompanied by raising concerns regarding their vibration behaviour when subjected to dynamic forcing such as footfall actions [4,5,6]. Given their notable structural efficiency, wooden floors are usually associated with smaller masses than their more conventional counterparts in steel or concrete.…”

Section: Introductionmentioning

confidence: 99%

“…The most probable human walking frequencies have been demonstrated to lie in the range of 1.5 -2.2 Hz with jogging and running inducing loads with frequencies well above that range [23]. Nonetheless, wooden floors have relatively low fundamental frequencies and are susceptible to modal clustering [5], making them particularly vulnerable to vibration discomfort. In many cases, this does not mean that analyses should be restricted to the lowest modes and any design decision is bound to be case-specific.…”

Section: Introductionmentioning

confidence: 99%

Novel Digitally-manufactured Wooden Beams for Vibration Reduction

Mariotti

Ilkanaev²

2018

Structures

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The low modal mass and stiffness of timber floors impose a number of motioncontrol challenges to the structural designer. These difficulties can often led to the implementation of sub-optimal solutions, such as the addition of supplemental mass and stiffness in the form of concrete slabs, that conflict with the claimed sustainability and lightweight advantages of wood. In this paper, we present a novel beam configuration that enhances the vibration comfort response of timber flooring systems while retaining the original environmental benefits of wood in construction. By taking advantage of modern digital-fabrication tools, we devise, test and analyse new beam configurations that incorporate flexural resonators tuned to key structural frequencies of the system. These resonators are integrated into the body of the beam and the structure is sized to satisfy typical strength and stiffness demands. A series of numerical, experimental and parametric studies demonstrate the vibration absorbing capabilities of the new designs and the feasibility of their implementation to satisfy current occupant comfort criteria.

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Prediction of motion responses of cross-laminated-timber slabs

Cited by 18 publications

References 11 publications

Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

Development of a Vibroacoustic Stochastic Finite Element Prediction Tool for a CLT Floor

Novel Digitally-manufactured Wooden Beams for Vibration Reduction

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