New Mthodology for Seismic Assessment of Non-Structural Building Components Based on Ambient Vibration Measurements


Abstract eng:
Experiences from past and recent earthquakes clearly demonstrate the importance of the good seismic performance of NonStructural Components (NSCs) to maintain the post-earthquake functionality of post-disaster buildings. Seismic design of NSCs is also essential to protect life safety of occupants and to avoid costly property damages in normal importance buildings. Non-structural building components can be categorized in accordance with their function as: Architectural components, Building services, and Building contents. They can also be classified in terms of their seismic response sensitivity as: Inter-story-drift-sensitive, Floor-acceleration-sensitive, and both inter-story-drift and floor-accelerationsensitive components [1]. Severe NSC damage observed in past moderate to strong earthquakes emphasizes that NSCs require a simple, practical and yet reasonably accurate approach to be designed against the seismically-induced forces and displacement effects. Various analytical approaches have been developed for seismic evaluation of NSCs during the past few decades. These approaches can be fit into two general groups according to dynamic coupling/decoupling of the structural (primary system) and non-structural (secondary system) components in the analysis. They are: 1- Floor Response Spectra (FRS) approach and 2- Combined Primary-Secondary System (CPSS) approach. In addition to these analysis approaches, recent building codes and standards have included several recommendations and provisions for seismic risk assessment and mitigation of NSCs in existing buildings, and empirical equations for seismic design of NSCs and their restraints. However, these analytical approaches and empirical equations have shortcomings that make them either impractical or imprecise. In this study, an original method is proposed to generate both Floor Response Spectrum (FRS) and inter-story drift curves based on building floor response histories generated using ambient vibration measurements (AVM) according to a method derived by Mirshafiei [2]. The proposed experimentally-derived FRS method improves the practicality and accuracy of seismic analysis of NSCs in several ways compared to the aforementioned analytical approaches and building codes. The method is validated through a case-study of pediatric hospital buildings in Montreal (Canada), by comparing the numerical results derived from a detailed calibrated finite element model of the building and the experimental results produced using the proposed method. The method is then employed for a database comprising 27 post-disaster buildings located in Montreal in which AVM were performed. FRS curves have been generated for every floor of all 27 buildings in two orthogonal horizontal directions considering different damping ratios for the NSCs. The input ground motions used in the study are comprised of a set of 20 seismic records compatible to the design Uniform Hazard Spectrum (UHS) of Montreal, as defined by the National Building Code of Canada (NBCC) [3]. The results are presented to show the effect of different parameters on the FRS curves.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1105.:
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