Experimental Fragility Analysis of Suspension Ceiling Systems

Soroushian, Siavash; Rahmanishamsi, Esmaeel; Ryu, Ki P.; Maragakis, Manos; Reinhorn, A. M.

doi:10.1193/071514eqs109m

Cited by 34 publications

(9 citation statements)

References 15 publications

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“…The median horizontal amplification factors of the typical two‐elevation ceiling system were 2.1 and 1.6 in the x and y direction, respectively, which were lower than 2.5 of the suggested acceleration amplification factor for flexible components in ASCE 7–16 35 . Furthermore, these values were smaller than the reported factors of 3.2 and 2.7 for the UB and UNR ceiling tests, respectively 12,36 . These differences in ceiling amplification were due to the significant difference in the type of suspension bars, that is, the threaded suspension bar in the fixed ceiling system rather than the suspension wire in the lay‐in ceiling system provided a much larger overall lateral stiffness.…”

Section: Integrity Of Two‐elevation Ceiling Systemmentioning

confidence: 76%

“…35 Furthermore, these values were smaller than the reported factors of 3.2 and 2.7 for the UB and UNR ceiling tests, respectively. 12,36 These differences in ceiling amplification were due to the significant difference in the type of suspension bars, that is, the threaded suspension bar in the fixed ceiling system rather than the suspension wire in the lay-in ceiling system provided a much larger overall lateral stiffness. Note that there are no suggested values for the acceleration amplification in Japanese regulations.…”

Section: Acceleration Responses At Two Elevationsmentioning

confidence: 99%

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Seismic evaluation of two‐elevation ceiling system by shake table tests

Kurata

Ikeda

et al. 2020

Earthq Engng Struct Dyn

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Past earthquakes highlighted the vulnerability of the suspended ceiling, especially in earthquake‐prone countries like Japan; the post‐earthquake reconnaissance showed that damage to ceiling systems led to immeasurable economic loss and disturbance of the timely rescue of casualty. The existing studies have mostly focused on the seismic performance of regular square and leveled ceilings, whereas the inevitable requirements to accommodate air ducts, nonstructural piping, and electrical equipment resulted in a two‐elevation ceiling system. This paper reports a series of full‐scale shake table tests on a typical two‐elevation ceiling system, which includes electrical equipment, piping system, and commonly used suspended ceiling structure. Experimental observations showed that the two‐elevation ceiling system performed well under earthquake excitation. No fallen panels or overall system collapse occurred during shaking. This paper discusses the effects of a temporary‐positioning‐bracing bar (TPBB) between two ceiling elevations and peripheral constraints by surrounding wall on the acceleration and displacement response and torsional behavior in the ceiling system. Then, a simplified analytical model was established and verified with the experimental response of different ceiling configurations. The test results indicated that a sufficiently strong TPBB is essential to reduce the relative displacement between two ceiling elevations, and it ensures the integrity of two ceiling elevations in the ceiling system. In conclusion, the TPBB shall remain in the ceiling system after the construction stage.

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Section: Integrity Of Two‐elevation Ceiling Systemmentioning

confidence: 76%

Section: Acceleration Responses At Two Elevationsmentioning

confidence: 99%

Seismic evaluation of two‐elevation ceiling system by shake table tests

Kurata

Ikeda

et al. 2020

Earthq Engng Struct Dyn

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“…The work here presented aims to characterize the behaviour of two typologies of suspended ceiling joints, whose shape and performance significantly differ from all the suspended ceiling joints already investigated in Literature. In order to accurately compare the experimental results, the setup was designed similarly to the previous experimental campaigns on ceiling joints (Soroushian et al 2016b;Dhakal et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical assessment of suspended ceiling joints

Fiorin

Brandolese

Scotta

2020

Bull Earthquake Eng

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During an earthquake, damages of non-structural components can prevent the safe occupancy of buildings and contribute largely to the global economic losses. Ceiling systems are among the most common non-structural components, since they are widely installed in public buildings, retails and offices. As demonstrated by the failures reported after seismic events worldwide, ceiling joints are often subjected to damage that ultimately leads to collapse of the ceiling system. While perimeter joints have been assessed in many experimental campaigns, there are limited data regarding experimental and numerical characterisation of inner joints. Moreover, the available experimental results are characterized by elasto-fragile behaviour and concern devices which differ in size and type from the mechanical connections commonly manufactured in Europe. In this work a preliminary numerical study on a full-scale suspended ceiling model has been performed to evaluate the main actions on suspended ceiling joints. Moreover, an extensive experimental campaign has been conducted on a type of the so-called “standard” and “seismic” joints, produced in Europe and installed in different typologies of runners. Specimens were subjected to monotonic and cyclic quasi-static tests, using a similar setup to the ones used in Literature to allow a comparison of the performances obtained. Moreover, numerical models of the joints were developed and calibrated on the experimental results. The aim of this work is to evaluate the performance of different types of inner joints and investigate the influence of shape and dimensions of tees to the performance of the connection. The results here presented allows to accurately characterise the behaviour of inner joints and finally enhancing the global seismic behaviour of suspended ceilings.

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“…The test results showed a median amplification of 3.8 in the ceiling members with respect to the test frame columns. The tests indicated that for ceilings with a 22 mm (7/8 ") wall moulding, very low shake intensities could cause unseating failure (Soroushian et al, 2016).…”

Section: Shake Table Testsmentioning

confidence: 99%

“…The other limitation as mentioned in the study was the inability of the model to capture the progressive collapse behaviour of the system (Badillo-Almaraz et al, 2007). Soroushian et al (2016) performed testing to evaluate the non-linear axial behaviour of cross-tee joints to develop a detailed numerical model to represent this behaviour. The joints were tested in both monotonic and reverse cyclic tests to generate fragility curves and to verify the numerical results.…”

Section: Numerical Modelsmentioning

confidence: 99%

Development of Testing Facilities and Procedures for Seismic Performance of Suspended Ceilings

Davidson¹

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This study presents the initiation of Phase II of an international joint collaborative research project that is being carried out by researchers in Japan, China and Canada on the seismic performance of suspended non-structural components in supertall buildings. Research infrastructure was developed in this study for testing and evaluation of seismic performance of non-structural components. In addition to the development of the new research infrastructure, the development of a research program on testing of suspended ceiling systems by using the new research facilities was also included in this research. Suspended ceilings are often found in commercial buildings as part of the building contents. They are classified as non-structural components, which are also referred to as operational and functional components in a building because they provide important services or functions to the occupants of the facilities. Non-structural components typically are not designed as part of the primary seismic force resisting system; however, these components have an impact on the safety and seismic performance of the building because of their vulnerability and their contribution to the mass, stiffness, and interaction with the main structural system during earthquakes. Traditionally, the design of non-structural components, including suspended ceilings, does not consider seismic loads and the interaction effects with the supporting structure. The damage and disruption caused by failure of non-structural components can potentially represent a significant portion of the total economic loss in an earthquake. The performance of suspended ceilings, e.g., in hospitals and schools designated as post-disaster shelters, can be critical to emergency response, and recovery during and immediately after major earthquakes. In this study, previous experimental and numerical analysis research on the seismic performance of suspended ceilings are reviewed. This study also investigates the variation in design codes between the National Building Code of Canada and the International Building Code. Finally, the current seismic testing procedure is evaluated with simulated floor response records. The aim of the study is to initiate Phase II of the ILEE Project by creating the research infrastructure required for the seismic testing of non-structural components along with analytically investigating suspended ceilings to gain insights on their seismic performance. P a g e | ii G. DAVIDSON Acknowledgements I would like to express my gratitude to my supervisors David Lau and Jeffrey Erochko for the useful comments, remarks and engagement through the learning process of this master thesis. I would like to thank Prof. Kazuhiko Kasai of Tokyo Institute of Technology Prof. Huanjun Jiang of Tongji University for leading this successful collaboration. I am grateful to the teams at Tongji University and Tokyo Institute of Technology for their collaboration. I am also grateful to the Canadian Foundation of Innovation for the funding to make this research possibl...

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Experimental Fragility Analysis of Suspension Ceiling Systems

Cited by 34 publications

References 15 publications

Seismic evaluation of two‐elevation ceiling system by shake table tests

Seismic evaluation of two‐elevation ceiling system by shake table tests

Experimental and numerical assessment of suspended ceiling joints

Development of Testing Facilities and Procedures for Seismic Performance of Suspended Ceilings

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