Ambient Vibration Measurement Data of a Four-Story Mass Timber Building

Mugabo, Ignace; Barbosa, André R.; Riggio, Mariapaola; Batti, James

doi:10.3389/fbuil.2019.00067

Cited by 6 publications

(3 citation statements)

References 4 publications

(4 reference statements)

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“…A set of 16 uniaxial PCB model 393B04 accelerometers was used. The uniaxial accelerometers have ∼1,000 mV/g sensitivity, an acceleration measurement range of ± 5 g peak, a frequency range of 0.06 to 450 Hz, and a broadband resolution of 0.000003 g root mean square (RMS) [38]. The accelerometers were connected through coaxial cables to a portable data acquisition system (National Instruments, NI cDAQ -9174), which transmitted the RAW data to a laptop computer with NI Labview SignalExpress 2013 software [39].…”

Section: Instrumentation Setupmentioning

confidence: 99%

Dynamic Characterization of a Full-Scale Three-Story Mass Timber Building Structure

Uarac P,

Barbosa,

Sinha

et al. 2024

J. Phys.: Conf. Ser.

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A veneer-based engineered wood product known as Mass Ply Panels (MPP) was recently introduced and certified per ANSI-PRG 320. A full-scale three-story mass timber building structure was constructed and tested at Oregon State University to demonstrate the potential of MPP in the design of resilient, structural lateral force-resisting systems. The building structure comprised MPP diaphragms, laminated veneer lumber (LVL) beams and columns, and an MPP rocking wall design. Two opportunistic vibration tests were performed to charac-terize the dynamic properties of the structure. First, an implosion of a stadium within 600 m of the building location was used as the main excitation source, during which bi-directional horizontal acceleration data were collected for approximately 18 seconds. Second, an ambient vibration test was conducted to collect horizontal acceleration data for one hour. In both tests, sixteen accelerometers were used to measure the response of the structure. Modal features were extracted using an output-only method and compared with the estimates from a finite element model. Lessons learned can be used to inform future modeling efforts of a mass timber building to be tested on the Natural Hazards Engineering Research Infrastructure (NHERI) Experimental Facility at the University of California San Diego high-performance outdoor shake table.

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Section: Instrumentation Setupmentioning

confidence: 99%

Dynamic Characterization of a Full-Scale Three-Story Mass Timber Building Structure

Uarac P,

Barbosa,

Sinha

et al. 2024

J. Phys.: Conf. Ser.

Self Cite

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“…Figure 4 shows the two types of accelerometers and the data acquisition system used during the testing campaign. Further details on the accelerometer specifications are presented (Mugabo et al, 2019).…”

Section: Testing Description: Instrumentation Setup and Proceduresmentioning

confidence: 99%

Dynamic Characterization and Vibration Analysis of a Four-Story Mass Timber Building

Mugabo

Barbosa

Riggio

2019

Front. Built Environ.

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Mass timber construction has been gaining momentum in multi-story residential and commercial construction sectors in North America. As taller mass timber buildings are being planned and constructed, in-situ dynamic tests of this type of construction can be performed to further validate their design and use. As part of this larger effort, an in-situ dynamic characterization testing campaign based on ambient vibration measurements was conducted on a recently constructed four-story mass timber building located in Portland, Oregon. The building features cross-laminated timber (CLT) floors, a glued laminated timber (GLT) framing gravity system, and light-frame shear walls and steel HSS hold-downs that compose the lateral resisting system of the building. Ambient vibration acceleration testing data were collected using 18 accelerometers that were wired to a portable data acquisition system in two experimental setups. Approximately 2 h of bi-directional horizontal acceleration data were recorded. In this paper, two operational modal analysis methods are used for estimating the modal parameters (frequency, damping, and mode shapes) based on the data collected. In addition, a multi-stage linear Finite Element (FE) model updating procedure is presented for this building type and the FE estimates of frequencies and mode shapes are compared to estimates from the collected data. The calibrated FE model provides confidence to the operational modal results and presents a comprehensive modal characterization of the building. At ambient levels of excitation, the developed FE model suggests that stiffness of the non-structural elements, such as the exterior wall cladding, and glazing affects the modal response of the building considerably. Lessons learnt on this unique and first of a kind four-story structure constructed in the United States and implications for taller mass timber buildings are summarized and provide valuable insight for the design and assessment for this building type under future dynamic excitation events.

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“…On the other hand, its low mass makes it prone to reach a higher amplitude of vibrations. The assessment of timber buildings' vibration performances has two primary branches: one focused on evaluating the lateral response (Reynolds et al 2016;Mugabo et al 2019;Aloisio et al 2020f;Aloisio et al 2021), the other on assessing walk-induced vibrations and the comfort requirements for the users (Smith et al 2007). While the first field is relatively new, researchers have investigated the second aspect for many years (Ohlsson 1982;Smith and Chui 1988;Hu et al 2001;Hamm et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characterization of Timber Floor Subassemblies: Sensitivity Analysis and Modeling Issues

et al. 2021

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Timber floors are prone to exhibit vibration levels which can cause discomfort to the occupants. In the last twenty years, ambient vibration tests have become very popular due to the many advantages they have over traditional forced vibration tests, when dealing with civil engineering structures. Furthermore, sensitivity analyses and "black box" optimization algorithms can support the development of refined finite element models that accurately predict the structures' responses based on the experimental modal parameters. However, applications of these methods and techniques to timber structures are scarce compared to traditional materials. This paper presents and discusses the findings of an experimental testing campaign on a lightweight timber floor. At first, each component of the assembly was tested separately under different boundary conditions. Then 1 Pasca, December 14, 2021 the authors evaluated the behaviour of the whole floor assembly. In a second step, the authors carried out a covariance-based sensitivity analysis of FE models representative of the tested structures by varying the different members' mechanical properties. The results of the sensitivity analysis highlighted the most influential parameters and supported the comparison between diverse FE models. As expected, the longitudinal modulus of elasticity is the most critical parameter, although the results are very dependent on the boundary conditions. Then automatic modal updating algorithms tuned the numerical model to test results. As a concluding remark, the experimental and numerical results were compared to the outcomes of a simplified analytical approach for the floor's first natural frequency estimate based on Eurocode 5.

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Ambient Vibration Measurement Data of a Four-Story Mass Timber Building

Cited by 6 publications

References 4 publications

Dynamic Characterization of a Full-Scale Three-Story Mass Timber Building Structure

Dynamic Characterization of a Full-Scale Three-Story Mass Timber Building Structure

Dynamic Characterization and Vibration Analysis of a Four-Story Mass Timber Building

Dynamic Characterization of Timber Floor Subassemblies: Sensitivity Analysis and Modeling Issues

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