Establishing the fundamental period of light-frame wood buildings on the basis of ambient vibration tests

Hafeez, Ghazanfarah; Doudak, Ghasan; McClure, Ghyslaine

doi:10.1139/cjce-2017-0348

Cited by 16 publications

(7 citation statements)

References 12 publications

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“…This difference was attributed to the stiffness contribution of non-structural components. The differences in fundamental frequencies of light-frame shear wall structures tested under different levels of excitation have also been acknowledged by other studies (Kharrazi and Ventura, 2006;Hafeez et al, 2018). Notably, Kharrazi and Ventura (2006) suggested a simple equation relating the fundamental frequencies of light-frame low-rise structures obtained from ambient vibration to the ones obtained from forced vibrations dynamic characterization testing.…”

Section: Introductionmentioning

confidence: 72%

“…Several studies have evaluated the ambient dynamic behavior of light-frame shear wall buildings (Ellis and Bougard, 2001;Camelo et al, 2002;Steiger et al, 2016;Hafeez et al, 2018). Ellis and Bougard (2001) performed dynamic testing and evaluated the stiffness of a six-story light-frame timber building during different phases of construction.…”

Section: Introductionmentioning

confidence: 99%

“…Notably, Kharrazi and Ventura (2006) suggested a simple equation relating the fundamental frequencies of light-frame low-rise structures obtained from ambient vibration to the ones obtained from forced vibrations dynamic characterization testing. Hafeez et al (2018) evaluated fundamental periods and modal damping of 47 wood-frame buildings under ambient vibrations. The authors provided a fundamental period relationship based on the Rayleigh quotient (Chopra, 2012) and extended an equation developed in Kharrazi and Ventura (2006) for estimating fundamental frequencies of light-frame shear wall structures.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Mugabo

Barbosa

Riggio

2019

Front. Built Environ.

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“…At present, most of the research objects on dynamic characteristics of buildings are reinforced concrete structures, masonry structures and ancient wooden structures. The components are mainly beams, columns and shear walls among above buildings (Altunisik et al, 2018; Basaran, 2015; Hafeez et al, 2018; Lee, 2013; Reynolds et al, 2016). However, there are few studies on the overall dynamic characteristics of modern timber frame buildings, especially glulam frame structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Finite Element Method study on dynamic characteristics of beam-column glulam frame structure

Ding

Mohrmann

et al. 2022

Advances in Structural Engineering

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In order to strengthen the seismic design and diagnosis of glulam building structures, and improve the accuracy and reliability of building modal analysis, this paper uses the designed glulam frame structure as a research object to conduct experimental investigation on its dynamic properties. On the one hand, a computational modal analysis is carried out using ANSYS to determine the modal shapes and modal parameters of the glulam frame structure. On the other hand, transient excitation, steady-state contact excitation and steady-state non-contact excitation methods are used to test and analyze the experimental modalities of the field-built larch glulam frame structure. The research results show that the three experimental modal methods can all measure the biaxial(xy-) first-order bending, first-order torsion, and second-order bending modes of the glulam frame structure. The vibration shapes and modal frequencies are all consistent. The results of computational modal analysis and experimental modal analysis are combined in this article. Since the elastic constant input of components is measured by grading, the frequency values of the computational mode are larger. The error of the two analyses is about 15%. In the first-order bending mode in the x- and y-directions, both the computational and experimental modes show the characteristics of greater local stiffness in the gusset. In the uniaxial (x- or y-) torsional mode, the computational mode not only reflects the torsional characteristics of the upper beam region, but also shows first-order bending mode of the column, which is also consistent with the experimental mode.

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“…Considerations for sustainable design in recent years have highlighted the need to involve more wood material in construction. Whether in North America where timber design is well advanced and timber structures represent about 90% of low-rise construction (Hafeez et al, 2018), or in countries like Chile, where only around 21% of the building stock consist of timber as main structural elements (Banco Mundial, 2020), there is signi cant interest in the design and research communities in how to advance the structural performance of timber assemblies. Recent developments in material and connection manufacturing allowed the construction industry to go beyond light-frame and low-rise structures, especially in an effort to help resist lateral loads, such as wind and earthquake.…”

Section: Introductionmentioning

confidence: 99%

New Glulam-Framed Shear Wall Concept with Enhanced Behaviour Characteristics for Tall Timber Buildings in Seismic Areas.

Carrero

Montano

Perez

et al. 2022

Preprint

Self Cite

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This investigation covers the lateral performance of a new concept of hybrid timber shear wall, and includes individual connection testing, full-scale shear wall testing and numerical modeling. The main objective of this study is to develop enhanced timber structural solutions that facilitates the design and construction of mid-rise timber buildings in areas with high seismic demand. The new shear wall concept involves structural configurations similar to those found in conventional light-framed timber shear wall, but using glulam members as framing elements, connected to OSB sheathing panels using conventional nails. More specifically, the OSB sheathing is embedded within grooved glulam members in order to enhance the lateral capacity and stiffness of the wall. Connections and full-scale monotonic and cyclic shear wall testing were performed, and the results indicated that it is possible to obtain a high performing timber shear wall with the proposed concept. In particular, the obtained values are promising with strength and stiffness levels that are 3 times that of a conventional CLT shear wall. Furthermore, the proposed prototype comprises 0,89 m3 of wood volume, which represents less than one-fourth of the amount of wood in a CLT shear wall of equivalent lateral capacity. In addition, the ductility obtained for the proposed concept can be classified as high ductility class (HDC) according to the Eurocode 8. It is expected that the ductility may be further improved by limiting potential brittle failure observed in of one of the framing members at high displacement levels. Finally, it was found that available modelling tools with hysteretic models, such as the MSTEW, is capable of predicting the lateral strength and stiffness of the proposed concept, since modeling errors below 10% were obtained.

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Establishing the fundamental period of light-frame wood buildings on the basis of ambient vibration tests

Cited by 16 publications

References 12 publications

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

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

Experimental and Finite Element Method study on dynamic characteristics of beam-column glulam frame structure

New Glulam-Framed Shear Wall Concept with Enhanced Behaviour Characteristics for Tall Timber Buildings in Seismic Areas.

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