كليدواژه :
ﺿﺮﺑﻪ ﺳﺎزه اي , ﻣﺪت زﻣﺎن ﺣﺮﮐﺖ ﻗﻮي زﻣﯿﻦ , اﻟﻤﺎن اﻻﺳﺘﯿﮏ ﺧﻄﯽ , ﺗﺤﻠﯿﻞ ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ ﻏﯿﺮ ﺧﻄﯽ , ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدي
چكيده فارسي :
ﻣﻌﻤﻮﻻ در زﻟﺰﻟﻪﻫﺎي ﻣﺘﻮﺳﻂ و ﺷﺪﯾﺪ اﮔﺮ ﻓﺎﺻﻠﻪ ﻣﯿﺎن ﺳﺎزهﻫﺎي ﻣﺠﺎور ﮐﺎﻓﯽ ﻧﺒﺎﺷﺪ و ﺧﻮاص دﯾﻨﺎﻣﯿﮑﯽ ﺳﺎزهﻫﺎ ﺑﺎ ﻫﻢ ﻣﺘﻔﺎوت ﺑﺎﺷﺪ ﺑﻪ دﻟﯿﻞ ارﺗﻌﺎش ﻏﯿﺮ ﻫﻢﻓﺎز ﺳﺎزهﻫﺎ ﭘﺪﯾﺪ ﺿﺮﺑﻪ رخ ﻣﯽدﻫﺪ. ﻋﻮاﻣﻞ ﻣﺨﺘﻠﻔﯽ در ﭼﮕﻮﻧﮕﯽ ﺿﺮﺑﻪ ﺑﯿﻦ ﺳﺎزهﻫﺎ ﻣﻮﺛﺮ ﻣﯽﺑﺎﺷﺪو ﻣﺤﻘﻘﺎن در ﮔﺬﺷﺘﻪ ﻋﻮاﻣﻞ ﮔﻮﻧﺎﮔﻮﻧﯽ ﻫﻤﭽﻮن ﻓﺎﺻﻠﻪ ﻣﯿﺎن دو ﺳﺎزه، ﻧﻮع ﺿﺮﺑﻪ، ﻧﺤﻮه اﻧﺘﻘﺎل ﻧﯿﺮو ﺑﯿﻦ دو ﺳﺎزه، ﮐﺎﻫﺶ ﺧﺴﺎرت ﻧﺎﺷﯽ از ﺿﺮﺑﻪ و... را ﺑﺮرﺳﯽ ﮐﺮدهاﻧﺪ. ﻧﻮع ﺷﺘﺎب ﻧﮕﺎﺷﺖ ﻧﯿﺰ از ﻋﻮاﻣﻠﯽ اﺳﺖ ﮐﻪ ﻣﯽﺗﻮاﻧﺪ روي ﻣﯿﺰان ﺿﺮﺑﻪ ﺑﯿﻦ دو ﺳﺎزه ﺗﺎﺛﯿﺮﮔﺬار ﺑﺎﺷﺪ و ﯾﮑﯽ از ﭘﺎراﻣﺘﺮﻫﺎي ﻣﻬﻢ ﺷﺘﺎب ﻧﮕﺎﺷﺖ، ﻣﺪت زﻣﺎن ﺣﺮﮐﺖ ﻗﻮي زﻣﯿﻦ اﺳﺖ ﮐﻪ ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ آن ﺑﺮ ﭼﮕﻮﻧﮕﯽ ﭘﺎﺳﺦ ﺳﺎزهﻫﺎ از اﻫﻤﯿﺖ ﻓﺮاوان. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﺑﺮرﺳﯽ اﺛﺮ ﻣﺪت زﻣﺎن ﺣﺮﮐﺖ ﻗﻮي زﻣﯿﻦ ﺑﺮ ﺿﺮﺑﻪ ﺑﯿﻦ دو ﺳﺎزه ﻣﺠﺎور ﭘﺮداﺧﺘﻪ ﻣﯽﺷﻮد. ﺑﻪ اﯾﻦ ﻣﻨﻈﻮر ﺳﺎزهﻫﺎي ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدي 8 ،5 و 12 ﻃﺒﻘﻪاي ﻃﺮاﺣﯽ ﮔﺮدﯾﺪ ﮐﻪ درﺳﻪ ﺣﺎﻟﺖ )ﻣﺪلﻫﺎي 12-5 ،8-5 و 12-8ﻃﺒﻘﻪ در ﮐﻨﺎر ﻫﻢ( ﻣﻮرد ﺗﺤﻠﯿﻞ ﺗﺎرﯾﺨﭽﻪ زﻣﺎﻧﯽ ﻏﯿﺮ ﺧﻄﯽ ﻗﺮار ﮔﺮﻓﺘﻪاﻧﺪ. در اﯾﻦ ﺗﺤﻠﯿﻞ ﻫﺎ از 15 ﺷﺘﺎب ﻧﮕﺎﺷﺖ ﮐﻪ ﺷﺎﻣﻞ ﺳﻪ ﻃﯿﻒ از ﻣﺪت زﻣﺎن ﺣﺮﮐﺖ ﻗﻮي زﻣﯿﻦ ﻣﺘﻔﺎوت اﺳﺖ، )0 ﺗﺎ 10 ﺛﺎﻧﯿﻪ، 10 ﺗﺎ 30 ﺛﺎﻧﯿﻪ و 30 ﺛﺎﻧﯿﻪ و ﺑﺎﻻﺗﺮ( ﺑﻬﺮه ﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﻫﻤﭽﻨﯿﻦ ﺑﻪ ﻣﻨﻈﻮر درﯾﺎﻓﺖ ﻧﯿﺮوي ﺿﺮﺑﻪ در ﺑﯿﻦ ﺳﺎزهﻫﺎ در ﺗﺮاز ﮐﻒ ﻃﺒﻘﺎت از اﻟﻤﺎن اﻻﺳﺘﯿﮏ ﺧﻄﯽ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ ﮐﻪ در ﺳﺎزهﻫﺎﯾﯽ ﮐﻪ ﻓﺎﺻﻠﻪ ﯾﮏ درﺻﺪ ارﺗﻔﺎع در آﻧﻬﺎ رﻋﺎﯾﺖ ﻧﺸﺪه اﺳﺖ، ﺑﺎ اﻓﺰاﯾﺶ ﻣﺪت زﻣﺎن ﺣﺮﮐﺖ ﻗﻮي زﻣﯿﻦ، ﺑﯿﺸﺘﺮﯾﻦ ﻧﯿﺮوي ﺿﺮﺑﻪ ﺑﯿﻦ دو ﺳﺎزه ﻧﯿﺰ ﺑﺎ ﺷﯿﺐ ﻣﻼﯾﻤﯽ اﻓﺰاﯾﺶ ﻣﯽ ﯾﺎﺑﺪ و اﯾﻦ ﻧﺮخ رﺷﺪ در ﺳﺎزهﻫﺎﯾﯽ ﮐﻪ داراي ﻓﺎﺻﻠﻪ ﻧﯿﻢ درﺻﺪ ارﺗﻔﺎع ﺑﻮدهاﻧﺪ، ﺑﯿﺸﺘﺮ از ﺳﺎزهﻫﺎﯾﯽ ﮐﻪ ﺑﺪون ﻓﺎﺻﻠﻪ از ﻫﻢ ﺑﻮده اﻧﺪ، ﻣﺸﺎﻫﺪه ﺷﺪه اﺳﺖ.
چكيده لاتين :
Usually during moderate and strong earthquakes, if the space between the adjacent structures is not enough, structural pounding will occur which is due to the out-of-phase vibration of the structures regarding the differences in dynamic properties of the structures. Different factors contribute in the state of structural pounding, and researchers have already studied several factors including the space between two structures, the type of pounding, force transmission means, reducing the pounding damage and etc. Record is one of the factors which can affect the structural pounding, and one of the most crucial parameters of record is strong ground motion duration which its analysis is very important in the quality of structural response. In this study, effect of strong ground motion duration on the adjacent structural pounding is investigated. To do so, steel moment resisting frames in 5, 8 and 12 floors are designed which are paired together in three forms of 5-8, 5-12, and 8-12 models for nonlinear time history analysis. In this analysis, 15 records that include three intervals for strong ground motion duration are being implemented (0 to 10 seconds, 10 to 30 seconds, 30 seconds and more). Besides, in order to obtain the pounding force between structures, linear elastic elements are used in floor levels. Results show that in structures in which the space equal to 1% of their heights are not considered, with increasing the strong ground motion duration, maximum structural pounding will also increase with a smooth gradient, and for the structures with space equal to 0.5% of their heights, this increase rate is more compared to the structures with no space.
