بررﺳﯽ ﺗﻄﺒﯿﻘﯽ آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﻣﺘﺪاول ﻃﺮاﺣﯽ ﺑﺎ دﺳﺘﻮراﻟﻌﻤﻞ ﻫﺎي ﺑﻬﺴﺎزي ﻟﺮزه اي در ارزﯾﺎﺑﯽ ﻋﻤﻠﮑﺮد ﻗﺎب ﻫﺎي ﺧﻤﺸﯽ ﻓﻮﻻدي

Match Compliance of Conventional Design Codes with Instructions for Seismic Rehabilitation of Buildings in Performance Evaluation of Steel Moment Frames

ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﮔﺴﺘﺮش اﺳﺘﻔﺎده از دﺳﺘﻮراﻟﻌﻤﻞ ﻫﺎي ﺑﻬﺴﺎزي ﻟﺮزه اي ﺑﺮاي ارزﯾﺎﺑﯽ ﺳﻄﺢ ﻋﻤﻠﮑﺮد ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﻣﻮﺟﻮد در ﺳﺮاﺳﺮ ﺟﻬﺎن و ﻫﻤﭽﻨﯿﻦ اﺷﺎره ﺑﻪ اﺳﺘﻔﺎده از ﺗﺤﻠﯿﻞ ﻫﺎي ﻏﯿﺮﺧﻄﯽ در ﻃﺮاﺣﯽ ﺳﺎزه ﻫﺎي ﺟﺪﯾﺪ در وﯾﺮاﯾﺶ ﻫﺎي ﺟﺪﯾﺪ آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﻃﺮاﺣﯽ ﻟﺮزه اي ﺑﺮﺧﯽ از ﮐﺸﻮرﻫﺎ، ﺑﺤﺚ ﺗﻄﺒﯿﻖ اﯾﻦ ﻣﺪارك ﺑﺎ ﯾﮑﺪﯾﮕﺮ از اﻫﻤﯿﺖ وﯾﮋه اي ﺑﺮﺧﻮردار اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﻌﺮﻓﯽ ﭼﻬﺎر روش ﻣﺨﺘﻠﻒ ﺗﺤﻠﯿﻞ در دﺳﺘﻮراﻟﻌﻤﻞ ﺑﻬﺴﺎزي ﻟﺮزه اي ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﻣﻮﺟﻮد )ﻧﺸﺮﯾﻪ 360(، ﺳﺎزﮔﺎري اﯾﻦ روش ﻫﺎ ﻧﯿﺰ در ﺗﻌﯿﯿﻦ ﺳﻄﺢ ﻋﻤﻠﮑﺮد ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﻣﻮﺟﻮد ﻗﺎﺑﻞ ﺑﺮرﺳﯽ اﺳﺖ. از اﯾﻦ رو در اﯾﻦ ﺗﺤﻘﯿﻖ در راﺳﺘﺎي ﭘﺎﺳﺦ ﺑﻪ دو ﺳﻮال ﻓﻮق در ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﺑﺎ ﺳﯿﺴﺘﻢ ﺑﺎرﺑﺮ ﻗﺎب ﺧﻤﺸﯽ ﻓﻮﻻدي، ﻋﻤﻠﮑﺮد ﻟﺮزه اي ﺳﻪ ﺳﺎﺧﺘﻤﺎن ﻓﻮﻻدي ﺑﺎ ﭘﻼن ﻣﺸﺎﺑﻪ ﺷﮑﻞ ﭘﺬﯾﺮي وﯾﮋه و ﻣﺘﻮﺳﻂ ﮐﻪ ﺑﺎ اﺳﺘﻔﺎده از آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي راﯾﺞ ﻃﺮاﺣﯽ ﺳﺎزه ﻫﺎي ﻓﻮﻻدي )ﻣﺒﺤﺚ دﻫﻢ ﻣﻘﺮرات ﻣﻠﯽ ﺳﺎﺧﺘﻤﺎن( ﻃﺮاﺣﯽ ﺷﺪه ﺑﻮدﻧﺪ، ﺑﺎ اﺳﺘﻔﺎده از ﭼﻬﺎر روش ﺗﺤﻠﯿﻞ ﭘﯿﺸﻨﻬﺎدي در ﻧﺸﺮﯾﻪ 360 ﻣﻮرد ارزﯾﺎﺑﯽ ﻗﺮار ﮔﺮﻓﺖ. ﻧﺘﺎﯾﺞ ﺣﺎﺻﻞ از اﯾﻦ ﺗﺤﻘﯿﻖ ﻧﺸﺎن ﻣﯽ دﻫﺪ ﮐﻪ ﺑﻪ ﻃﻮر ﮐﻠﯽ ﻧﺸﺮﯾﻪ 360 ﻧﺴﺒﺖ ﺑﻪ آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﻣﺮﺳﻮم ﻃﺮاﺣﯽ ﺳﺎزه ﻫﺎي ﻓﻮﻻدي ﻣﺎﻧﻨﺪ ﻣﺒﺤﺚ دﻫﻢ ﻣﻘﺮرات ﻣﻠﯽ ﺳﺎﺧﺘﻤﺎن، ﺑﺮاي ﺳﺎزه ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﺟﺪﯾﺪ ﻣﻨﺠﺮ ﺑﻪ ﻣﻘﺎﻃﻊ ﺳﺒﮏ ﺗﺮي ﻣﯽ ﺷﻮد. ﺑﻪ ﻋﺒﺎرت دﯾﮕﺮ آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﻃﺮاﺣﯽ ﻟﺮزه اي ﻧﺴﺒﺖ ﺑﻪ آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﺑﻬﺴﺎزي داراي ﺿﻮاﺑﻂ ﺳﺨﺘﮕﯿﺮاﻧﻪ ﺗﺮي ﻣﯽ ﺑﺎﺷﻨﺪ. اﯾﻦ اﻣﺮ ﻣﯽ ﺗﻮاﻧﺪ ﺑﻪ دﻟﯿﻞ ﮐﻨﺘﺮل ﻣﻌﯿﺎر ﺗﻐﯿﯿﺮﺷﮑﻞ ﻧﺴﺒﯽ ﺟﺎﻧﺒﯽ ﻃﺒﻘﺎت در آﯾﯿﻦ ﻧﺎﻣﻪ ﻫﺎي ﻃﺮاﺣﯽ ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﺟﺪﯾﺪ ﯾﺎ دﯾﮕﺮ ﮐﻨﺘﺮل ﻫﺎي ﻣﻀﺎﻋﻒ ﻻزم ﺑﺎﺷﺪ ﮐﻪ در ﺳﺎﺧﺘﻤﺎن ﻫﺎي ﻓﻮﻻدي ﺑﺎ ﻗﺎب ﺧﻤﺸﯽ ﮐﻨﺘﺮل ﮐﻨﻨﺪه ﻃﺮح ﻫﺴﺘﻨﺪ.

Today, instructions for seismic rehabilitation of existing buildings are widely used for seismic performance evaluation of existing buildings. Moreover, nonlinear structural analysis methods are permitted for seismic design of new buildings in recent versions of seismic design codes in some countries, such as Iran. Therefore, match compliance of conventional design codes with instructions for seismic rehabilitation of existing buildings is of great importance. On the other hand, four different analysis methods are available in seismic rehabilitation instructions that compatibility of these analysis techniques can be evaluated. In this regard, seismic performance of three buildings with steel moment frames as lateral load resisting system with 4, 8 and 12 stories that were designed previously according to conventional seismic design codes with two levels of ductility (Intermediate and Special) were evaluated using seismic vulnerability assessment instruction in Iran (Code No. 360) by means of four analysis procedures. Analysis results indicate that conventional seismic design codes are more conservative than Code No. 360. In other words, design of steel moment frames with conventional design codes leads to stronger beams and columns. This phenomenon can be due to controlling lateral interstory drift and weak beam-strong column criterion in moment frames that control final design of these structures.