Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes
Ductility plays a central role in seismic analysis and design of steel buildings. A numerical investigation regarding the evaluation of energy dissipation, ductility, and ductility reduction factors for local, story, and global structural levels is conducted. Some steel buildings and strong motions,...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2018/9713685 |
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| author | Alfredo Reyes-Salazar Edén Bojórquez Juan Bojorquez Federico Valenzuela-Beltran Mario D. Llanes-Tizoc |
| author_facet | Alfredo Reyes-Salazar Edén Bojórquez Juan Bojorquez Federico Valenzuela-Beltran Mario D. Llanes-Tizoc |
| author_sort | Alfredo Reyes-Salazar |
| collection | DOAJ |
| description | Ductility plays a central role in seismic analysis and design of steel buildings. A numerical investigation regarding the evaluation of energy dissipation, ductility, and ductility reduction factors for local, story, and global structural levels is conducted. Some steel buildings and strong motions, which were part of the SAC Steel Project, are used. Bending local ductility capacity (µLϕ) of beams can reach values of up to 20, as shown in experimental investigations. The values are larger for medium than for low-rise buildings, reflecting the effect of the structural complexity on µLϕ. Most of the dissipated energy occurs on beams; however, resultant stresses at columns are also significantly reduced by beam yielding. A value of 1/3 is proposed for the ratio of global to local ductility; thus, if local ductility capacity is stated as the basis for the design, global ductility capacity can be calculated by using this ratio. It is implicitly assumed in seismic codes that the magnitude of the global ductility reduction factor is about 4; according to the results found in this paper, it is not justified; a value of 3 is observed to be more reasonable. According to the well-known ratio of the ductility reduction factor to ductility, this ratio should be unity for the models under consideration; the results of this study indicate that, for global response parameters, a value of 3/4 is more appropriate and that, for local response parameters, values larger than 2 can be reached; the implication of this is that using simplified methods like the static equivalent lateral force may result in nonconservative designs from a global structural point of view, but in conservative designs from a local point of view. A value of 8 is proposed for the ratio of the global ductility reduction factor to the global normalized energy. |
| format | Article |
| id | doaj-art-e815478828bf4b0c97a71da184a9e715 |
| institution | DOAJ |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-e815478828bf4b0c97a71da184a9e7152025-08-20T03:21:03ZengWileyShock and Vibration1070-96221875-92032018-01-01201810.1155/2018/97136859713685Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by EarthquakesAlfredo Reyes-Salazar0Edén Bojórquez1Juan Bojorquez2Federico Valenzuela-Beltran3Mario D. Llanes-Tizoc4Facultad de Ingeniería, Universidad Autónoma de Sinaloa, Culiacán, CP 80040 Sinaloa, MexicoFacultad de Ingeniería, Universidad Autónoma de Sinaloa, Culiacán, CP 80040 Sinaloa, MexicoFacultad de Ingeniería, Universidad Autónoma de Sinaloa, Culiacán, CP 80040 Sinaloa, MexicoInstituto de Ingeniería, Universidad Nacional Autónoma de México, CP 04510 Ciudad de México, MexicoFacultad de Ingeniería, Universidad Autónoma de Sinaloa, Culiacán, CP 80040 Sinaloa, MexicoDuctility plays a central role in seismic analysis and design of steel buildings. A numerical investigation regarding the evaluation of energy dissipation, ductility, and ductility reduction factors for local, story, and global structural levels is conducted. Some steel buildings and strong motions, which were part of the SAC Steel Project, are used. Bending local ductility capacity (µLϕ) of beams can reach values of up to 20, as shown in experimental investigations. The values are larger for medium than for low-rise buildings, reflecting the effect of the structural complexity on µLϕ. Most of the dissipated energy occurs on beams; however, resultant stresses at columns are also significantly reduced by beam yielding. A value of 1/3 is proposed for the ratio of global to local ductility; thus, if local ductility capacity is stated as the basis for the design, global ductility capacity can be calculated by using this ratio. It is implicitly assumed in seismic codes that the magnitude of the global ductility reduction factor is about 4; according to the results found in this paper, it is not justified; a value of 3 is observed to be more reasonable. According to the well-known ratio of the ductility reduction factor to ductility, this ratio should be unity for the models under consideration; the results of this study indicate that, for global response parameters, a value of 3/4 is more appropriate and that, for local response parameters, values larger than 2 can be reached; the implication of this is that using simplified methods like the static equivalent lateral force may result in nonconservative designs from a global structural point of view, but in conservative designs from a local point of view. A value of 8 is proposed for the ratio of the global ductility reduction factor to the global normalized energy.http://dx.doi.org/10.1155/2018/9713685 |
| spellingShingle | Alfredo Reyes-Salazar Edén Bojórquez Juan Bojorquez Federico Valenzuela-Beltran Mario D. Llanes-Tizoc Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes Shock and Vibration |
| title | Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes |
| title_full | Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes |
| title_fullStr | Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes |
| title_full_unstemmed | Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes |
| title_short | Energy Dissipation and Local, Story, and Global Ductility Reduction Factors in Steel Frames under Vibrations Produced by Earthquakes |
| title_sort | energy dissipation and local story and global ductility reduction factors in steel frames under vibrations produced by earthquakes |
| url | http://dx.doi.org/10.1155/2018/9713685 |
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