Seismic Fragility Analysis of Freestanding Hospital Cabinets Based on Shaking Table Tests

Shang, Qingxue; Li, Jichao; Du, Chunbo; Wang, Tao

doi:10.1080/13632469.2022.2091684

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…32 Rocking and overturning fragility of the hospital cabinets and rocking fragility of the inside contents were assessed based on the experimental data. 33 Besides, the block locations inside the supporting structure is of paramount importance to their rocking performance. The rocking and overturning fragility of the blocks subjected to floor motions was investigated in previous studies mainly based on numerical simulation.…”

Section: Noveltymentioning

confidence: 99%

“…The experimental overturning fragility curves of three prismatic blocks with different slenderness ratios under bidirectional ground motions were generated 32 . Rocking and overturning fragility of the hospital cabinets and rocking fragility of the inside contents were assessed based on the experimental data 33 . Besides, the block locations inside the supporting structure is of paramount importance to their rocking performance.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

Liu

Zhang

Chen

et al. 2023

Earthq Engng Struct Dyn

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To provide an insight for reliable seismic risk assessment of small building contents, the rocking response of freestanding wooden blocks subjected to 11 bidirectional horizontal ground motion records scaled to various intensity levels is investigated via shaking table tests. Three prisms and three cylinders with slenderness ratios of 2, 3 and 4, and three prisms having the same slenderness ratio of 3 but different size parameters of 158 mm, 237 mm and 316 mm, are considered. The peak ground acceleration statistics corresponding to rocking and overturning of the blocks are obtained. Shaking table tests to investigate the rocking response of the prisms located on different floors of a full-scale three-story reinforced concrete frame structure were also conducted. Experimental fragility curves corresponding to rocking and overturning occurrence of the blocks are finally generated. The experimental results highlight that the minimum rocking accelerations are different for the prisms with the same slenderness ratio but different sizes. Moreover, compared with the prism on the ground, the prism on the top floor has significantly higher rocking demand, while the prism on the second floor may have lower rocking demand. Furthermore, the cylinder has higher rocking and overturning fragility than the prism with the same height and width. The rocking and overturning fragility increases as the block becomes slenderer or smaller. The proposed critical rocking acceleration under bidirectional seismic excitation in real conditions is a half of the theoretical one under unidirectional excitation. K E Y W O R D Sbidirectional ground and floor motions, freestanding blocks, rocking and overturning, seismic fragility, shaking table tests INTRODUCTIONFreestanding slender building contents, such as museum collections, showcases, electrical equipment and hospital devices, usually rock or overturn even during earthquakes of low to moderate intensity levels. The financial or cultural loss due to seismic damage of these contents is often more significant than that of the structural members. It is essential

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Section: Noveltymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

Liu

Zhang

Chen

et al. 2023

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…1,2 In the context of the PBEE framework, the importance of nonstructural component (NSC) performance in estimating economic and functional loss and the ensuing recovery, has been heavily emphasized in the research literature. [3][4][5][6][7][8][9][10] Also, the state-of-the-art version of the PBEE framework specified in FEMA-P58 11 incorporates the seismic damage and loss evaluation of NSCs. In general, NSCs can be categorized as being acceleration-sensitive (e.g., suspended ceilings, hanging lamps), velocity-sensitive (e.g., bookcases, filing cabinets), and displacement-sensitive elements (e.g., infill walls, stairs).…”

Section: Introductionmentioning

confidence: 99%

“…Unlike previous assessment methods that focused on quantifying structural safety and reliability, the PBEE framework aims to provide insights into the economic loss, human fatalities, and downtime caused by an earthquake event 1,2 . In the context of the PBEE framework, the importance of nonstructural component (NSC) performance in estimating economic and functional loss and the ensuing recovery, has been heavily emphasized in the research literature 3–10 . Also, the state‐of‐the‐art version of the PBEE framework specified in FEMA‐P58 11 incorporates the seismic damage and loss evaluation of NSCs.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic assessment of the rules used to combine peak floor responses of special concentrically braced frames under orthogonal seismic effects

Wang

Huang

Burton

et al. 2023

Earthq Engng Struct Dyn

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Estimating seismic demands and the associated damage to nonstructural components (NSCs) is a critical step in the performance‐based earthquake engineering (PBEE) framework. To facilitate this type of assessment, NSCs are classified as being acceleration, velocity, or displacement sensitive. When two‐dimensional structural models and response history analyses are used in the PBEE framework, heuristics are used to combine the orthogonal responses. Although there has been significant research to develop and evaluate combination rules for structural component responses, comparatively much less attention has been placed on NSC demands. FEMA P‐58 does provide a combination rule specifically for NSC seismic demands; however, the basis and accuracy of these provisions have never been examined. In this paper, the effectiveness of three popular combination rules used to estimate peak floor acceleration (PFA) and peak floor velocity (PFV) is investigated. Incremental dynamics analyses under unidirectional and bidirectional record‐sets are performed on six special concentrically braced frame buildings with different heights and torsional irregularity. The associated floor responses are used to examine the efficacy of the combination rules. Subsequently, a probabilistic approach is proposed to enhance the accuracy of combination rules. The performance of the enhanced combination rules is compared to that of a surrogate model that estimates PFA and PFV under orthogonal seismic effects. The results show that the performance of existing combination rules is slightly affected by building height and plan irregularity. Also, the combination rule suggested by FEMA P58 is found to overestimate the PFA and PFV demands by 10–15% compared to the demands derived from bidirectional response history analysis.

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“…As a pioneering work, the seminal framework proposed by Housner [11] for the seismic response evaluation of freestanding rigid blocks has been followed by many in-vestigators, including experimental [12][13][14][15][16][17][18][19][20] and numerical efforts [21][22][23][24][25][26][27][28][29][30][31][32][33]. To predict the occurrence of overturning, Ishiyama [34] proposed overturning criteria involving the overturning acceleration and velocity, which are the minimum peak acceleration and velocity of the input excitation needed to overturn a rigid block, respectively.…”

Section: Introductionmentioning

confidence: 99%

Seismic Overturning Fragility Analysis for Rigid Blocks Subjected to Floor Motions

2023

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This paper investigates the seismic rocking-overturning fragility of freestanding rigid blocks subjected to one-sine acceleration pulses from a probabilistic perspective. An equivalent single-degree-of-freedom (SDOF) model with a bespoke discrete damper is used to simulate the responses of four blocks with varying geometries under excitation with various characteristics. The simulation results are used to perform an overturning fragility analysis and evaluate the performance of various intensity measures (IMs). An IM strip, referred to as a hybrid strip, can be observed in the analysis, within which both safe rocking and overturning occur. For IM values outside of the hybrid strip, there exists a clear distinction between these two states. In this study, we introduce the hybrid ratio, a parameter that can estimate the size of the hybrid strip of different IMs. The hybrid ratio is defined as the combination of two ratios of hybrid strip width and the two IM strip widths corresponding to safe rocking and overturning, respectively. The effect of the different analysis strip widths is also examined in the overturning fragility analysis. The results suggest that the IM determined by excitation magnitude, frequency, and block geometry parameters demonstrates its superiority compared with some well-known IMs by having the smallest hybrid ratio and coefficient of variation, as well as good robustness of the overturning fragility curves against the change of the analysis strip width.

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Seismic Fragility Analysis of Freestanding Hospital Cabinets Based on Shaking Table Tests

Cited by 18 publications

References 16 publications

Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

Experimental study on rocking blocks subjected to bidirectional ground and floor motions via shaking table tests

Probabilistic assessment of the rules used to combine peak floor responses of special concentrically braced frames under orthogonal seismic effects

Seismic Overturning Fragility Analysis for Rigid Blocks Subjected to Floor Motions

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