Engineering Geology

Engineering Geology

Seismic Performance of Steel Bundled Tube Structures under Scaled Near-Field Records according to the Iranian Seismic Code 2800 - 3rd & 4th Editions 

Authors
Aida Jahed Shiran
Masood Azhdarifar
Afshin Meshkat-Dini
Abstract
This research is focused on an analytical approach to investigate the seismic performance of tall building under scaled near-field earthquake records. To achieve this objective, it is employs medium to high rise steel bundled-tube rigid frames. The examined structures are designed according to the Iranian seismic code 2800 (4th edition). To study the seismic response, groups of near field earthquake records with their associated properties are selected to perform non-linear time history analyses. The most important characteristic of the chosen near-field earthquake records is the presence of powerful long-term velocity pulses which distinguishes them from far-field earthquake records. The first part of the mentioned ensemble includes two recorded strong ground motions in Iran i.e. Tabas 1978 and Bam 2003, respectively and two powerful records of the Northridge 1994 earthquake. The second part contains one far-field record of the Northridge 1994 earthquake. The selected records are scaled based on the Iranian seismic code 2800 (3rd and 4th editions). The characteristics of seismic performance of each structural model, including maximum relative displacement of each story, seismic base shear and the formation of plastic hinges in the resistant skeleton have been carefully evaluated. The results indicate that using the 4th edition of the Iranian seismic code 2800 produces noticeably lower values of scale factor and their associated seismic responses in the studied structures as well as the nonlinear demand of the main load bearing members under scaled records with those factors, compared to the corresponding analytical cases based on the 3rd edition of the Iranian seismic code 2800. According to the results of this study, the rate of the drift parameter variations of structures that have been evaluated on the basis of seismic code 4th edition in comparison with the seismic code 2800 are experiencing a relative reduction about 30%.
Keywords
seismic design
near field record
velocity pulse
scale factor
bundled-tube
Tabas earthquake record (1978)
bam earthquake record (2003)
Northridge earthquake (1994)
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