Paper Title :Evaluating Damage Spectra for Steel Braced Frames Due to Near-Field and Far-Field Earthquakes
Author :B. Mohebi, M. A. Rostamkhani, F. Kazemi
Article Citation :B. Mohebi ,M. A. Rostamkhani ,F. Kazemi ,
(2019 ) " Evaluating Damage Spectra for Steel Braced Frames Due to Near-Field and Far-Field Earthquakes " ,
International Journal of Advances in Mechanical and Civil Engineering (IJAMCE) ,
pp. 69-73,
Volume-6,Issue-2
Abstract : Recent ground motion records demonstrate that the near-field earthquakes have various properties compared to
far-field earthquakes. In general, most of these properties are affected by an important phenomenon called ‘forward
directivity’ in near-fault earthquakes. Measuring structural damages are one of the common activities administered after an
earthquake. Predicting the amount of damage caused by the earthquake as well as determining the vulnerability of the
structure is extremely significant. In order to measure the amount of structural damages, instead of calculating the
acceleration and velocity spectrum, it is possible to use the damage spectra of the structure. The damage spectrum is a kind
of nonlinear spectrum that is drawn by setting the nonlinear parameters related to the single degree of freedom structures and
its dynamic analysis under the specific record and measuring damage of any structure. In this study, the damage spectra of
steel structures have been drawn. For this purpose, different kinds of concentric and eccentric braced structures with various
ductility coefficients in hard and soft soil under near-field and far-field ground motion records have been considered using
the Krawinkler and Zohrei damage index. The results indicate that, by increasing the structures' fundamental period, the
amount of damage increases under the near-field earthquakes compared to far-field earthquakes. In addition, by increasing
the structure ductility, the amount of damage based on near-field and far-field earthquakes decreases noticeably.
Furthermore, in concentric braced structures, the amount of damage under the near-field earthquakes is almost two times
more than the amount of damage in eccentrically braced structures especially for fundamental periods larger than 0.6 s.
Keywords - Damage spectra, damage index, forward directivity, near-field earthquakes, far-field earthquakes.
Type : Research paper
Published : Volume-6,Issue-2
DOIONLINE NO - IJAMCE-IRAJ-DOIONLINE-15417
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Copyright: © Institute of Research and Journals
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Published on 2019-07-03 |
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