The influence of flexible sound insulation layers on the seismic performance of cross laminated timber walls

Azinović, Boris; Pazlar, Tomaž; Kržan, Mojca

doi:10.1016/j.jobe.2021.103183

Cited by 5 publications

(6 citation statements)

References 36 publications

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“…During this time it is likely that cracks have appeared, causing the stiffness of the panels to reduce. Another difference between this building and those of case studies 1 and 2 is that it featured vibroacoustic insulation under the internal walls, which very likely reduces the stiffness of the building [30]. A large standard deviation of the updated values of the shear modulus makes it difficult to draw clear conclusions in this case study.…”

Section: Façade and Other Non-structural Elementsmentioning

confidence: 92%

“…Conversely, a significant decrease in stiffness was observed after the installation of a layer of vibroacoustic insulation under the walls [29], as illustrated in case (d). Similarly, it was observed that a layer of vibroacoustic insulation decreases the stiffness in shear testing as well [30]. Another important decision is how to model connections between the panels.…”

Section: Introductionmentioning

confidence: 90%

“…The updating of the model identified a softening effect of the connections, both axially and shear. It should be noted that all of those platform-frame buildings featured vibroacoustic insulation under the CLT walls, which can reduce the stiffness by as much as 60% [30].…”

Section: Modal Testing and Model Updatingmentioning

confidence: 99%

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Modelling of Multi-Storey Cross-Laminated Timber Buildings for Vibration Serviceability

Kurent,

Friedman,

Brank

2024

Buildings

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In this study, the vibration serviceability of multi-storey timber buildings is addressed. The core of this study pertains to the preparation of a comprehensive finite element model to predict modal properties for an accurate vibration serviceability checking. To that end, findings obtained from studying three multi-storey timber buildings are summarized and discussed. Two of the buildings (of seven and eight storeys) consist entirely of cross-laminated timber (CLT), while the third is a five-storey hybrid CLT-concrete building. Thanks to the detailed finite element models and modal testing results, one has the capability to conduct sensitivity analyses, classical and Bayesian model updating, and uncertainty quantifications. With these methodologies, influential modelling parameters as well as the sources of modelling error were identified. This allowed for conclusions to be drawn about the in-plane shear stiffness of the constructed walls (whose higher value causes the natural frequencies to increase by up to 25%), the soil deformability (which may cause the natural frequencies to drop by up to 20%), and the perpendicular-to-the-grain deformation of floor slabs (which may lead to an overestimation of a fundamental frequency by up to 8%).

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Section: Façade and Other Non-structural Elementsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 90%

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Modelling of Multi-Storey Cross-Laminated Timber Buildings for Vibration Serviceability

Kurent,

Friedman,

Brank

2024

Buildings

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“…One hypothesis is also that the slab-wall connection, seen in Figure 7a and Figure 7c, also reduces the total shear stiffness of a CLT shear wall. Azinovic et al [41] concluded in a series of full-scale laboratory tests that the sound insulation placed beneath each CLT wall for acoustic requirements reduced the elastic stiffness to less than 40 % of that of an uninsulated wall. The same type of sound insulation is used in House Biologen 1.…”

Section: 2mentioning

confidence: 99%

Dynamic Evaluation of a Nine-Story Timber-Concrete Hybrid Building during construction

Larsson

Abdeljaber

Dorn

2023

Preprint

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Timber-concrete hybrid buildings are an innovative solution to increase the amount of timber materials used in modern buildings. This study presents a dynamic evaluation of a nine-story timber-concrete hybrid residential building during construction. The building consists of a seven-story structure in cross-laminated timber (CLT) on top of two stories in concrete. Ambient vibration tests were conducted seven times during the 13-month construction period, including tests with only the structural elements in place and tests of the finished building with the façade, non-structural walls, and other internal finishing. The results show a clear decrease in the natural frequencies of the building as the building gets higher and more elements are installed. However, a slight increase in the natural frequency was observed following the installation of the non-structural walls in the final construction stage. A corresponding finite element analysis is presented for each test, providing additional insights into the parameters typically used in the structural design process. The study demonstrates the importance of properly selecting reduction factors for CLT elements in a dynamic finite element analysis. It also shows the importance of considering non-structural walls, both regarding weight and stiffness, even in buildings where the number of non-structural walls is relatively small compared to structural walls.

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“…One hypothesis is the use of acoustic insulation under each wall has a high impact, which may numerically be covered by a reduced shear stiffness. This has previously been shown by Azinović et al (2021), that concluded that the elastic stiffness of an acoustic insulated wall is less than 40 % that of an uninsulated wall at low vertical loads and a more flexible acoustic insulation.…”

Section: Discussionmentioning

confidence: 62%

Timber-concrete hybrid structural systems: Examples, long and short-term dynamic monitoring, and numerical analysis

Larsson¹

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Timber-concrete hybrid buildings are an innovative solution to increase the amount of timber materials in modern buildings. Due to its lower impact on the environment than materials like steel and concrete, the demand for timber products is rising as the construction industry aims to decrease its environmental footprint.Timber is naturally grown, and certain characteristics must be considered when used in buildings, such as strength and stiffness properties depending on variables like fiber direction and moisture content. In addition, timber is a lightweight material, which influences dynamic performance of timber elements and structures.To fulfill the requirements of a modern building, timber elements are sometimes combined with concrete elements, introducing timber-concrete hybrid buildings.This study aims to expand the use of timber-concrete hybrid buildings within the construction industry. The objective is to present different types of timber-concretehybrid buildings and evaluate their structural performance to improve the level of knowledge for structural designers for the safe and robust design of such buildings.Typically, four different types of timber-concrete hybrid structures are found in building projects in Sweden. These types of building projects usually involve additional designers than regular projects due to a lack of knowledge in timberdesign. Additionally, different designers uses different statical models for their designs, even within the same building project.A mobile measurement system was developed to perform in-situ dynamic measurements. The system was used in a nine-story timber-concrete hybrid building during construction to investigate the dynamic properties and validate structural design models. A parameter study highlights different design parameters that have a large influence on these models. These parameters include the in plane shear stiffness of CLT wall elements, the foundation properties, as well asnon-load-bearing internal walls.In addition, the long-term dynamic response of a four-story office timber concrete hybrid building is presented. Over a three-years evaluation period, the results show a clear seasonal variation of the natural frequencies which correlates well with the moisture content within a CLT slab element. The results show that environmental effects are to be considered when comparing with finite element models. A predictive model is presented that can be implemented in a structural health monitoring system for damage detection so that these environmental effects can be filtered out.

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The influence of flexible sound insulation layers on the seismic performance of cross laminated timber walls

Cited by 5 publications

References 36 publications

Modelling of Multi-Storey Cross-Laminated Timber Buildings for Vibration Serviceability

Modelling of Multi-Storey Cross-Laminated Timber Buildings for Vibration Serviceability

Dynamic Evaluation of a Nine-Story Timber-Concrete Hybrid Building during construction

Timber-concrete hybrid structural systems: Examples, long and short-term dynamic monitoring, and numerical analysis

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