نمود تحلیلی پالس‌های سرعت بر رفتار لرزه‌ای سیستم میان مرتبه ترکیبی قاب خمشی فولادی و پانل‌های مهاربندی‌ واگرا

ﺳﺎزهﻫﺎی ﺗﺮﮐﯿﺒﯽ ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدی و ﭘﺎﻧﻞﻫﺎی ﻣﻬﺎرﺑﻨﺪیﺷﺪه ﺑﻪ دﻟﯿﻞ ﺷﮑﻞﭘﺬﯾﺮی ﻣﻨﺎﺳﺐ در ﮐﻨﺎر ﺳﺨﺘﯽ ﺑﺎﻻ ﺟﻬﺖ ﻣﻘﺎﺑﻠﻪ ﺑﺎ ﻧﯿﺮوﻫﺎی ﺑﺰرگ دﯾﻨﺎﻣﯿﮑﯽ ﻧﺎﺷﯽ از زﻟﺰﻟﻪﻫﺎ، ﺳﯿﺴﺘﻤﯽ ﻣﻨﺎﺳﺐ ﺑﺮای ﺳﺎزهﻫﺎی ﻣﯿﺎن ﻣﺮﺗﺒﻪ ﻣﯽﺑﺎﺷﻨﺪ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ، ﺧﺼﻮﺻﯿﺎت رﻓﺘﺎر ﻟﺮزهای دو ﺳﺎزه 10 ﻃﺒﻘﻪ ﺑﺎ ﺳﯿﺴﺘﻢ ﺗﺮﮐﯿﺒﯽ ﻗﺎب ﺧﻤﺸﯽ-ﭘﺎﻧﻞﻫﺎی ﻣﻬﺎرﺑﻨﺪی واﮔﺮا و ﻗﺎب ﺧﻤﺸﯽ-ﭘﺎﻧﻞﻫﺎی ﻣﻬﺎرﺑﻨﺪی واﮔﺮای زﯾﭗدار ﺗﺤﺖ اﺛﺮ زﻣﯿﻦﻟﺮزهﻫﺎی ﻗﺪرﺗﻤﻨﺪ ﺣﻮزه ﻧﺰدﯾﮏ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. اﻧﺪازه و ﺗﻐﯿﯿﺮات ﭘﺎراﻣﺘﺮﻫﺎی ﭘﺎﺳﺦ ﻟﺮزهای ﻣﺪلﻫﺎی ﻣﻄﺎﻟﻌﺎﺗﯽ ﺑﺮ ﭘﺎﯾﻪ اﻧﺠﺎم ﺗﺤﻠﯿﻞﻫﺎی ﻏﯿﺮ ﺧﻄﯽ ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ ﻣﺤﺎﺳﺒﻪ ﮔﺮدﯾﺪه اﺳﺖ. ﻣﺪلﻫﺎی ﻣﻄﺎﻟﻌﺎﺗﯽ ﻣﻄﺎﺑﻖ ﺑﺎ ﺿﻮاﺑﻂ ﻃﺮح ﻟﺮزهای وﯾﺮاﯾﺶ ﭼﻬﺎرم آﯾﯿﻦﻧﺎﻣﻪ 2800 و ﻣﺒﺎﺣﺚ ﺷﺸﻢ و دﻫﻢ ﻣﻘﺮرات ﻣﻠﯽ ﺳﺎﺧﺘﻤﺎن ﻃﺮاﺣﯽ ﺷﺪهاﻧﺪ. ﺑﺮ ﭘﺎﯾﻪ ﻧﺘﺎﯾﺞ اﯾﻦ ﭘﮋوﻫﺶ؛ داﻧﺴﺘﻪ ﺷﺪه ﮐﻪ وﺟﻮد ﭘﺎﻟﺲﻫﺎی ﺑﺰرگ و ﭘﯿﻮﺳﺘﻪ در ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ زﻟﺰﻟﻪﻫﺎی ﻧﯿﺮوﻣﻨﺪ، ﭘﺎراﻣﺘﺮﻫﺎی ﭘﺎﺳﺦ ﺳﺎزه را ﺑﻪ ﺷﺪت ﺗﺤﺖ ﺗﺄﺛﯿﺮ ﻗﺮار ﻣﯽدﻫﺪ. ﺳﺎﺧﺘﺎر ﻣﻄﺎﻟﻌﺎﺗﯽ اﯾﻦ ﭘﮋوﻫﺶ درﺑﺮﮔﯿﺮﻧﺪه روﻧﺪ ﺗﺤﻠﯿﻠﯽ ﻣﺮﺑﻮط ﺑﻪ ﻧﻤﻮدارﻫﺎی ﭘﻮش ﺑﯿﺸﯿﻨﻪ درﯾﻔﺖ، ﺷﺘﺎب و ﺳﺮﻋﺖ ﻃﺒﻘﺎت ﺳﺎزهﻫﺎی ﻣﻄﺎﻟﻌﺎﺗﯽ و ﻫﻤﭽﻨﯿﻦ ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ درﯾﻔﺖ ﻃﺒﻘﺎت و ﻧﯿﺮوی ﻣﺤﻮری ﺳﺘﻮنﻫﺎ اﺳﺖ. ﻧﻤﻮدارﻫﺎی ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ درﯾﻔﺖ ﻃﺒﻘﺎت، ﻫﻢ ارز ﺑﻮدن ﺗﻐﯿﯿﺮات ﻧﺎﮔﻬﺎﻧﯽ اﯾﻦ ﭘﺎراﻣﺘﺮ ﺑﺎ ﭘﺎﻟﺲ اﺻﻠﯽ ﺳﺮﻋﺖ را ﻧﺸﺎن ﻣﯽدﻫﺪ. ﺑﺮرﺳﯽ ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ ﮐﻪ ﻋﻼوه ﺑﺮ وﺟﻮد ﭘﯿﭽﯿﺪﮔﯽ ﺗﻮﺻﯿﻔﯽ در ﭘﺎﺳﺦﻫﺎ، ﻧﯿﺎزﻫﺎی ﻟﺮزهای ﺗﺤﺖ رﮐﻮردﻫﺎی ﺣﻮزه ﻧﺰدﯾﮏ ﮔﺴﻞ، دارای ﻧﻤﻮد ﺑﻪ ﻣﺮاﺗﺐ ﺑﺰرگﺗﺮی ﻧﺴﺒﺖ ﺑﻪ رﮐﻮردﻫﺎی دور از ﮔﺴﻞ ﻣﯽﺑﺎﺷﺪ. روﻧﺪ ﺗﺸﮑﯿﻞ ﻣﻔﺎﺻﻞ ﭘﻼﺳﺘﯿﮏ از ﻧﻈﺮ ﻧﻮع و ﻣﺤﻞ، ﺑﺴﺘﻪ ﺑﻪ ﻋﻤﻠﮑﺮد ﺳﯿﺴﺘﻢ ﻣﻘﺎوم ﺳﺎزهای، ﺗﺤﺖ ﺗﺄﺛﯿﺮ ﻣﺎﻫﯿﺖ راﻧﺪوم رﮐﻮردﻫﺎی ﻧﯿﺮوﻣﻨﺪ زﻟﺰﻟﻪ ﻗﺮار دارد.

Analytical Aspects of Velocity Pulses on Seismic Behaviour of Mid Rise Compound Skeleton of Steel Moment Frame and Eccentrically Braced Panels

Steel moment frame and bracing panels compound structures are suitable systems for mediumheight resistant skeletons due to their desirable ductility along with high rigidity when facing large dynamic forces caused by earthquakes. In this research, the seismic behavior of two 10story buildings with compound systems of moment frame/eccentrically braced frames as well as moment frame/eccentrically braced frame with zipper elements are evaluated. The evaluation and changes of the seismic response parameters of the studied models are based on performing nonlinear time history analyses. The studied models are designed according to the fourth edition of seismic design provisions in Code 2800, plus the 6th and 10th issues of the Iranian National Building Regulations. Following the results of this research, it has been recognized that the existence of large coherent pulses in the time history of powerful earthquakes affects the response parameters of the building to a great extent. The results of this research includes the analytical process in the graphs related to maximum push of the drift, floors acceleration and velocity of the studied structural models and also the time history of story’s drift and axial force of the columns. The results show that seismic responses and demands under nearfield records have a bigger appearance than the corresponding effects obtained exposed to farfield records.