ﺑﺮرﺳﯽ ﻋﻤﻠﮑﺮد ﻟﺮزهاي ﻏﯿﺮﺧﻄﯽ ﺳﺎزهﻫﺎي ﺑﺘﻦ ﻣﺴﻠﺢ دوﺑﻠﮑﺴﯽ ﺑﻪ روش ﻃﯿﻒ ﻇﺮﻓﯿﺖ

Nonlinear Seismic Performance of RC Structures with Different Floor by Capacity Spectrum Method

ﻣﻼﺣﻈﺎت ﻣﻌﻤﺎري از ﻗﺒﯿﻞ ﻗﺮارﮔﯿﺮي ﭘﯿﻠﻮت و واﺣﺪﻫﺎي ﺗﺠﺎري در ﻫﻤﮑﻒ، ﺟﻠﻮﮔﯿﺮي از ﺗﺠﻤّﻊ وروديﻫﺎي ﻣﺨﺘﻠﻒ در ﻣﺠﺘﻤﻊﻫﺎي آﭘﺎرﺗﻤﺎﻧﯽ، ﺳﺎزهﻫﺎي دوﺑﻠﮑﺴﯽ را ﭘﺪﯾﺪ ﻣﯽآورد ﮐﻪ در آنﻫﺎ ﮐﻒﻫﺎي ﻃﺒﻘﺎت ﺑﺎ اﺧﺘﻼف ﺗﺮازي ﻧﺴﺒﺖ ﺑﻪ ﻫﻢ در دو ﯾﺎ ﭼﻨﺪ ﺗﺮاز ارﺗﻔﺎﻋﯽ ﻣﺨﺘﻠﻒ اﯾﺠﺎد ﻣﯽﺷﻮﻧﺪ. در ﺳﺎزهﻫﺎي دوﺑﻠﮑﺴﯽ ﻋﻤﺪه ﻣﺸﮑﻼت ﻧﺎﺷﯽ از ﻋﺪم ﭘﯿﻮﺳﺘﮕﯽ دﯾﺎﻓﺮاﮔﻢ ﮐﻒ ﻣﯽﺑﺎﺷﺪ ﮐﻪ ﺑﺎﻋﺚ ﺗﻐﯿﯿﺮات ﭼﺸﻢﮔﯿﺮي در دوره ﺗﻨﺎوب، ﺳﺨﺘﯽ و ﭘﺨﺶ ﻧﯿﺮوي زﻟﺰﻟﻪ ﻣﯽﮔﺮدد. در اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﺎ آﻧﺎﻟﯿﺰ اﺳﺘﺎﺗﯿﮑﯽ ﺧﻄﯽ و ﻏﯿﺮﺧﻄﯽ ﺑﻪ ﺑﺮرﺳﯽ ﻣﻮﻗﻌﯿﺖ ﻣﮑﺎﻧﯽ و زﻣﺎﻧﯽ وﻗﻮع اوﻟﯿﻦ ﻣﻔﺼﻞ ﭘﻼﺳﺘﯿﮏ در ﺗﯿﺮﻫﺎ و ﺳﺘﻮنﻫﺎي ﮐﻮﺗﺎه، دوره ﺗﻨﺎوب، ﺗﻐﯿﯿﺮ ﻣﮑﺎن، ﻧﯿﺮوي ﺑﺮﺷﯽ، ﻧﻘﻄﻪ ﻋﻤﻠﮑﺮد و ﻃﯿﻒ ﻇﺮﻓﯿﺖ و... در ﭘﻨﺞ ﺳﺎزه دوﺑﻠﮑﺴﯽ 8 ،6 ،4 ،2 و 10 ﻃﺒﻘﻪ ﭘﺮداﺧﺘﻪﺷﺪه اﺳﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن ﻣﯽدﻫﺪ ﮐﻪ اﺛﺮ اﺧﺘﻼف ﺗﺮاز در ﺳﺎزهﻫﺎي ﮐﻮﺗﺎه ﻣﺸﻬﻮدﺗﺮ ﺑﻮده و ﺑﺎ اﻓﺰاﯾﺶ ارﺗﻔﺎع اﺛﺮ ﭘﺪﯾﺪه ﺳﺘﻮن ﮐﻮﺗﺎه در ﺳﺎزهﻫﺎي دوﺑﻠﮑﺴﯽ ﮐﺎﻫﺶ و ﻧﻘﻄﻪ ﻋﻤﻠﮑﺮدي آن اﻓﺰاﯾﺶ ﻣﯽﯾﺎﺑﺪ.

Civil engineering structures as well as office or apartment building are affected by earthquakes. In some buildings, few or no walls are provided at the first story (pilot). In the structures with difference in story level, major problems is due to discontinuity of floor diaphragm that causes significant changes in period, stiffness and distribution of earthquake force. In this paper, using linear and nonlinear static analysis, time history and location of plastic hinge in short columns and beams, period, displacement, shear force, performance point and capacity spectrum and…, in 2, 4, 6, 8, and 10 story structures with story level difference are studied. The results show that the effect of level difference in short structures is obvious and by increasing the height difference, the effect of short column phenomenon is decreased and the performance point is increased.