Seismic response of floor‐anchored nonstructural components fastened with yielding elements

2021 ◽  
Author(s):  
Tal Feinstein ◽  
Jack P. Moehle
Keyword(s):  
Seismic Response ◽  
Nonstructural Components

scholarly journals Irregularity Effects of Masonry Infills on Nonlinear Seismic Behaviour of RC Buildings

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Massimiliano Ferraioli ◽  
Angelo Lavino
Keyword(s):  
Seismic Response ◽  
Seismic Vulnerability ◽  
Eurocode 8 ◽  
Seismic Action ◽  
Rc Buildings ◽  
Infill Walls ◽  
Nonstructural Components ◽  
Action Effects ◽  
Masonry Infills ◽  
Shear Demand

Despite extensive research studies, the seismic response of infilled reinforced concrete buildings remains an open problem due to both the complexity of the interaction between the infill and the frame and the large number of parameters involved. Thus, guidelines for both modelling and analysis are still lacking and the infill walls are normally treated as nonstructural components in seismic codes. However, it may be not conservative to neglect the influence of infills. In fact, the infill masonry walls may significantly affect the stiffness, strength, and energy dissipation capacity of RC buildings, even when they are regularly distributed. Recognizing this influence and its importance on the vulnerability of infilled frames, Eurocode 8 requires amplifying seismic action effects due to infills. In this paper, the effectiveness of the Eurocode 8 design provisions for infill irregularity in plan and/or elevation was investigated. To this aim, different in-plan layouts of infill walls were selected as marginal cases for which Eurocode 8 does not require amplification of the action effects due to the presence of infills, or the additional measures to counteract these effects are not mandatory. The seismic vulnerability of the infilled RC buildings was evaluated using nonlinear static and nonlinear dynamic analyses. Both cracking and crushing of masonry and stiffness and strength degradation were considered in the analysis. The effect of the layout of the masonry infills on the seismic response in terms of resistance and displacement was evaluated. Results show that in one of the case studies here examined, it is not conservative to neglect the influence of infill panels. In fact, structural failure due to torsion and soft-storey effects may occur even in cases where Eurocode 8 does not require the amplification of the action effects. Finally, the total shear demand on columns may be underestimated, even in cases where the code provisions for infills irregularity are not mandatory, and the additional shear demand in the columns induced by the masonry infill is very low.

scholarly journals Seismic Qualification of Electrical Cabinet Using High-Fidelity Simulation under High Frequency Earthquakes

2020 ◽  
Vol 12 (19) ◽  
pp. 8048
Author(s):  
Hoyoung Son ◽  
Seonggwan Park ◽  
Bub-Gyu Jeon ◽  
Woo-Young Jung ◽  
Jongwoong Choi ◽  
...  
Keyword(s):  
Seismic Response ◽  
High Frequency ◽  
Power Plants ◽  
Low Frequency ◽  
Experimental Tests ◽  
Design Guidelines ◽  
High Fidelity ◽  
High Fidelity Simulation ◽  
Nonstructural Components ◽  
Fundamental Frequencies

Most nuclear and nonnuclear power plants have been designed in the frequency range of 2 to 10 Hz, but now, the design guidelines for structural and nonstructural components such as electrical cabinets must be improved by including high frequency greater than 10 Hz for sustainable energy. The electrical cabinet is the essential piece of equipment for safety functions and the uncertainty of seismic capability in power plants. Consequently, the attention of this study focused on evaluating the seismic demands of the electrical cabinet under high frequency earthquakes and also, seismic qualification of the electrical cabinet using the identification of experimental tests and numerical models. An experimental test based on ICC-ES AC 156 and IEEE std.344 was conducted for seismic qualification of the cabinet and then, a high-fidelity finite element model to capture the significant deformation was developed in this study. It is observed that the fundamental frequencies were 16 and 24 Hz from the experimental tests, respectively. In order to verify the proposed high-fidelity simulation model, the target fundamental frequencies of the cabinet were evaluated in the ABAQUS platform. It was interesting to note that the reconciliation of experimental and analytical results was extremely identical. Furthermore, in order to evaluate seismic response characteristics of the cabinet subjected to high and low frequency earthquakes, time history analysis was conducted in this study, using the ABAQUS platform. As a result, the observation showed that the seismic response of the cabinet system under a high frequency earthquake was relatively higher than that of low frequency. It can be very important to note that the cabinet system was sensitive to high frequency vibration.

An Analytical Approximation to the Seismic Response of Light Linear Nonstructural Components in Resonance With Linear Structures

2021 ◽  
Author(s):  
Julio Cesar Miranda
Keyword(s):  
Spectral Analysis ◽  
Modal Analysis ◽  
Seismic Response ◽  
Fundamental Mode ◽  
Analytical Calculation ◽  
Analytical Approximation ◽  
Nonstructural Components ◽  
Upper Limit ◽  
Comparison Of The Results ◽  
Mode A

Abstract This paper considers the analytical calculation of the seismic response of light nonstructural components resonant with the buildings to which they are affixed. The mechanical systems thus conformed are presumed to be linearly elastic and classically damped, such that a traditional modal analysis can be carried out. Intended to estimate the upper limit of the response, the procedure developed is indicated for resonance with the fundamental mode, a condition which usually controls the response of the components. The correlation of the two closely spaced modes resulting from the dynamics of the component-building system, is accounted for through a spectral analysis. Comparison of the results predicted by the procedure described in this paper with limited numerical applications, corroborates that it is successful in predicting the response of the components when these are tuned to low order modes of the carrying structure. However, as also seen, the procedure is inappropriate to calculate the response of the components when their tuning involves higher modes of the supporting structure. Given the successful numerical forecasting of the response of the components, and given the compact form of the proposed equations, the feasibility of developing their codified form merits further investigation.

Seismic response of nonstructural components considering the near-fault pulse-like ground motions

2016 ◽  
Vol 10 (5) ◽  
pp. 1213-1232
Author(s):  
Chang-Hai Zhai ◽  
Zhi Zheng ◽  
Shuang Li ◽  
Xiaolan Pan ◽  
Li-Li Xie
Keyword(s):  
Seismic Response ◽  
Ground Motions ◽  
Nonstructural Components ◽  
Near Fault

Shake Table Testing of Lightweight Steel Drywall Nonstructural Components

2018 ◽  
Vol 763 ◽  
pp. 423-431 ◽  
Author(s):  
Bianca Bucciero ◽  
Tatiana Pali ◽  
Maria Teresa Terracciano ◽  
Vincenzo Macillo ◽  
Luigi Fiorino ◽  
...  
Keyword(s):  
Seismic Response ◽  
Fragility Curves ◽  
Human Life ◽  
Economic Losses ◽  
Shake Table ◽  
Structural Components ◽  
Seismic Behaviour ◽  
Nonstructural Components ◽  
Lightweight Steel ◽  
Partition Walls

Damages of non-structural components during a seismic event can involve risks for the human life, interruption of ordinary activities and significant economic losses. Therefore, the understanding of the seismic behaviour of non-structural components is a fundamental prerequisite for their use. In this context, a cooperation between the University of Naples "Federico II" and KnaufGips KG Company, aimed to the knowledge of seismic response of lightweight steel drywall non-structural components was carried forward. In this framework, shake table tests were carried out on protoypes composed by indoor partition walls, outdoor façade walls and suspended continuous ceilings. The influence on seismic response of basic and enhanced anti-seismic solutions, corresponding to the use of fixed or sliding connections at the walls and ceilings perimeter, was investigated. The seismic response in terms of damage occurrence was also evaluated by fragility curves, which show that enhanced solutions have a better seismic response than basic solutions and indoor partition walls have a higher seismic “fragility” than outdoor façade walls.

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