Building contents sliding demands in elastically responding structures

Lin, Sheng-Lin; MacRae, Gregory A.; Dhakal, Rajesh; Yeow, Trevor

doi:10.1016/j.engstruct.2015.01.004

Cited by 21 publications

(14 citation statements)

References 27 publications

(61 reference statements)

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“…The importance of ω T was also observed in a numerical study by Lin et al [15] using sinusoidal floor motion with constant amplitude and frequency. In addition, they found that δ S for contents within elastic single-storey buildings subjected to realistic ground motions can be approximated by the first sliding excursion displacement of contents subjected to sinusoidal floor motion.…”

Section: Introductionsupporting

confidence: 57%

Wall building stiffness and strength effect on content sliding in Wellington seismic conditions

Yeow

MacRae

Dhakal

2016

Earthq Engng Struct Dyn

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Summary A numerical study of unobstructed content sliding within several low‐to‐midrise reinforced concrete cantilever wall buildings designed to Wellington conditions in New Zealand is performed to validate the belief that increasing a building's strength and/or stiffness would result in more severe sliding response. It was shown that contents within stronger buildings experienced larger sliding response. If the building was designed to be strong, the sliding response of contents with a friction coefficient of 0.1 was smaller in stiffer buildings compared with those in flexible buildings. However, the trends start reversing with an increase in friction coefficient or a decrease in building strength. Overall, content sliding is not necessarily more severe in stiffer buildings, and in many cases, the opposite is true. This study's findings were compared against an existing parametric equation for estimating the maximum sliding displacement. This equation, which was originally derived for contents located within elastic frame buildings, was found to be more efficient than considering total floor accelerations alone but was underconservative by a mean of 17% for yielding multistorey buildings. A design procedure considering content sliding using the parametric equation and an example are provided. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 57%

Wall building stiffness and strength effect on content sliding in Wellington seismic conditions

Yeow

MacRae

Dhakal

2016

Earthq Engng Struct Dyn

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“…Therefore the need to define numerical models for the prediction of hospital building content performance is claimed. Some models for sliding-dominated components were investigated in past research studies (Konstantinidis and Makris 2009;Konstantinidis and Nikfar 2015;Lin et al 2015); the absence of numerical models for rocking-dominated hospital building contents is, however, clearly denoted. The aim of the present research study is to provide simple tools to both researchers and practitioners for the assessment of the seismic performance of hospital building contents.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling and fragility assessment of typical freestanding building contents

Petrone

Sarno

Magliulo

et al. 2016

Bull Earthquake Eng

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The paper assesses the adequacy of existing numerical models in predicting the seismic response of freestanding nonstructural components that exhibit rocking-dominated behavior. Based on a previous experimental test program on hospital building contents carried out by the authors, the study focuses on two different modelling techniques: (a) finite element method (FEM) and (b) rigid block model. The ability to predict the response of two hospital cabinets tested in the laboratory is verified by comparing the numerical response with the experimental one. The applicability and limitations of each modelling technique are also discussed. The outcomes of the present study show that both the adopted modeling techniques can provide a reliable prediction of the occurrence of rocking mechanism in hospital cabinets. Rigid block model can also predict the occurrence of the overturning, whereas FEM model can provide a prediction of the acceleration distribution at different locations of the cabinets, e.g. at different shelf levels. The efficiency of different intensity measures in predicting the damage states in rigid block is estimated. Comprehensive incremental dynamic analyses on different rigid blocks highlight that dimensionless intensity measure PGA/(gtgα) is the most efficient intensity measure to predict rocking and overturning in small rigid blocks, whereas pPGV/(gtgα) is the most effective for large rigid blocks. Such intensity measures also allow generalizing the results to different rigid blocks, through the definition of a fragility approach

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“…The rocking response of freestanding objects has been studied in great length in . The problem of sliding objects has been studied at various levels in . Recently, notable full‐scale shake table test studies which included the performance of nonstructural components were undertaken.…”

Section: Introductionmentioning

confidence: 99%

Shake table investigation on the seismic performance of hospital equipment supported on wheels/casters

Nikfar

Konstantinidis

2016

Earthq Engng Struct Dyn

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Summary This paper presents an experimental investigation on the seismic response of medical equipment supported on wheels and/or casters. Two pieces of equipment were tested: a large ultrasound machine and a cart carrying smaller medical equipment. In the first phase, the resistance of the wheels and casters of the equipment was characterized through a controlled‐displacement procedure on the shake table. In the second phase, an extensive shake table test program was carried out to investigate the seismic response of the equipment. The input signals for the shake table tests included floor motions of a four‐story steel braced‐frame hospital designed to satisfy seismic requirements of a site in the Los Angeles area. The results of 96 shake table tests reported in this study include the seismic performance of the equipment under both unlocked and locked conditions, located on various floor levels of the building. It was observed that engaging the casters' locking mechanism does not necessarily decrease the relative displacement. The displacement response was sensitive to the excitation intensity and the orientation of the equipment with respect to the input excitation. Based on the experimental observations, appropriate structural engineering demand parameters associated with the relative displacement and relative velocity demands of the equipment are proposed and used to develop conditional probability curves. Finally, in an effort to extend the results of this experimental study to similar equipment on wheels/casters, the performance of a simple numerical model in predicting the peak seismic demands is evaluated. Copyright © 2016 John Wiley & Sons, Ltd.

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Building contents sliding demands in elastically responding structures

Cited by 21 publications

References 27 publications

Wall building stiffness and strength effect on content sliding in Wellington seismic conditions

Wall building stiffness and strength effect on content sliding in Wellington seismic conditions

Numerical modelling and fragility assessment of typical freestanding building contents

Shake table investigation on the seismic performance of hospital equipment supported on wheels/casters

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