Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern

Since the lateral load pattern along the height proposed in seismic codes such as standard 2800-4th has been developed on the basis of elastic behavior without paying attention to the type of earthquake, it seems the story lateral force under near and far fault motions during inelastic behavior diff...

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Autores principales:	Abbas Nazari, Navid Siahpolo, Akbar Hassanipour
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2018
Materias:	سطح خطر زلزله قاب خمشی فولادی الگوی توزیع بار تحلیل تاریخچه زمانی غیرخطی Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/730f5201165c4b90b9a1285caeebb25c
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spelling	oai:doaj.org-article:730f5201165c4b90b9a1285caeebb25c2021-11-08T15:48:11ZAnalytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern2476-39772538-261610.22065/jsce.2017.86065.1184https://doaj.org/article/730f5201165c4b90b9a1285caeebb25c2018-09-01T00:00:00Zhttps://www.jsce.ir/article_46874_00cf27ab97a2830c7b280601c96dcbd3.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Since the lateral load pattern along the height proposed in seismic codes such as standard 2800-4th has been developed on the basis of elastic behavior without paying attention to the type of earthquake, it seems the story lateral force under near and far fault motions during inelastic behavior differ from the code load pattern. This difference affects the distribution of strength and stiffness. In the previous studies, less attention has been paid to the effect of a near fault earthquake on the story load pattern, although pulse type vibrations with long period, large amplitude and short duration are important key parameters and may affect the load pattern. Therefore, in this study the exact load pattern has been assessed for four steel moment frames with 4, 8, 12 and 18 stories under two sets of earthquakes (20 near and 20 far fault motions) and two earthquake hazard level (DBE and MCE). Moreover, the 8-story model has been redesigned with the exact load patterns. Based on this study assumption, results show that exact load pattern differs from what has been proposed by standard 2800. This difference depends on earthquake type, hazard level and the height of the structure. In lower and upper stories, exact load pattern is larger than the code value due to the higher mode and P-delta effects. However, for the middle part, the code load pattern is conservative. For the far fault motions higher mode effects and for the near fault earthquakes, the P-delta effects are the main source of aforementioned differences. Furthermore, the result of redesigned 8-story models shows that depending on the earthquake type and hazard level, using exact load pattern can change parameters such as stress ratio, element weights and inelastic drifts at the lower and upper parts in comparison with the code based load pattern.Abbas NazariNavid SiahpoloAkbar HassanipourIranian Society of Structrual Engineering (ISSE)articleسطح خطر زلزلهقاب خمشی فولادیالگوی توزیع بارتحلیل تاریخچه زمانی غیرخطیBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 5, Iss 2, Pp 40-59 (2018)
institution	DOAJ
collection	DOAJ
language	FA
topic	سطح خطر زلزله قاب خمشی فولادی الگوی توزیع بار تحلیل تاریخچه زمانی غیرخطی Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	سطح خطر زلزله قاب خمشی فولادی الگوی توزیع بار تحلیل تاریخچه زمانی غیرخطی Bridge engineering TG1-470 Building construction TH1-9745 Abbas Nazari Navid Siahpolo Akbar Hassanipour Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
description	Since the lateral load pattern along the height proposed in seismic codes such as standard 2800-4th has been developed on the basis of elastic behavior without paying attention to the type of earthquake, it seems the story lateral force under near and far fault motions during inelastic behavior differ from the code load pattern. This difference affects the distribution of strength and stiffness. In the previous studies, less attention has been paid to the effect of a near fault earthquake on the story load pattern, although pulse type vibrations with long period, large amplitude and short duration are important key parameters and may affect the load pattern. Therefore, in this study the exact load pattern has been assessed for four steel moment frames with 4, 8, 12 and 18 stories under two sets of earthquakes (20 near and 20 far fault motions) and two earthquake hazard level (DBE and MCE). Moreover, the 8-story model has been redesigned with the exact load patterns. Based on this study assumption, results show that exact load pattern differs from what has been proposed by standard 2800. This difference depends on earthquake type, hazard level and the height of the structure. In lower and upper stories, exact load pattern is larger than the code value due to the higher mode and P-delta effects. However, for the middle part, the code load pattern is conservative. For the far fault motions higher mode effects and for the near fault earthquakes, the P-delta effects are the main source of aforementioned differences. Furthermore, the result of redesigned 8-story models shows that depending on the earthquake type and hazard level, using exact load pattern can change parameters such as stress ratio, element weights and inelastic drifts at the lower and upper parts in comparison with the code based load pattern.
format	article
author	Abbas Nazari Navid Siahpolo Akbar Hassanipour
author_facet	Abbas Nazari Navid Siahpolo Akbar Hassanipour
author_sort	Abbas Nazari
title	Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
title_short	Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
title_full	Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
title_fullStr	Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
title_full_unstemmed	Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
title_sort	analytical study of the earthquake type (far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2018
url	https://doaj.org/article/730f5201165c4b90b9a1285caeebb25c
work_keys_str_mv	AT abbasnazari analyticalstudyoftheearthquaketypefarandnearandhazardleveleffectsontheheightwiseloadpatternoncomparisonwiththestandard28004thloadpattern AT navidsiahpolo analyticalstudyoftheearthquaketypefarandnearandhazardleveleffectsontheheightwiseloadpatternoncomparisonwiththestandard28004thloadpattern AT akbarhassanipour analyticalstudyoftheearthquaketypefarandnearandhazardleveleffectsontheheightwiseloadpatternoncomparisonwiththestandard28004thloadpattern
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Analytical study of the earthquake type (Far and near) and hazard level effects on the height-wise load pattern on comparison with the standard 2800-4th load pattern

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