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Main Title: Quasistatic seismic damage indicators for RC structures from dissipating energies in tangential subspaces
Author(s): Krätzig, Wilfried B.
Petryna, Yuri S.
Type: Article
Language Code: en
Abstract: This paper applies recent research on structural damage description to earthquake-resistant design concepts. Based on the primary design aim of life safety, this work adopts the necessity of additional protection aims for property, installation, and equipment. This requires the definition of damage indicators, which are able to quantify the arising structural damage. As in present design, it applies nonlinear quasistatic (pushover) concepts due to code provisions as simplified dynamic design tools. Substituting so nonlinear time-history analyses, seismic low-cycle fatigue of RC structures is approximated in similar manner. The treatment will be embedded into a finite element environment, and the tangential stiffness matrix K𝑇 in tangential subspaces then is identified as the most general entry for structural damage information. Its spectra of eigenvalues 𝜆 𝑖 or natural frequencies 𝜔 𝑖 of the structure serve to derive damage indicators 𝐷 𝑖, applicable to quasistatic evaluation of seismic damage. Because det K𝑇 = 0denotes structural failure, such damage indicators range from virgin situation 𝐷𝑖 = 0 to failure 𝐷𝑖 = 1 and thus correspond with Fema proposals on performance-based seismic design. Finally, the developed concept is checked by reanalyses of two experimentally investigated RC frames.
Issue Date: 12-Jan-2014
Date Available: 3-Feb-2016
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): damage indicator
seismic damage
safety concept
Journal Title: Mathematical problems in engineering
Publisher: Hindawi
Publisher Place: New York, NY
Volume: 2014
Article Number: 615792
Publisher DOI: 10.1155/2014/615792
EISSN: 1563-5147
ISSN: 1024-123X
Appears in Collections:FG Statik und Dynamik » Publications

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