بررسي رفتار بتن محبوس شده با استفاده از فضاي اكتاهدرال

Study of Confined Concrete with Using of Octahedral Phase

ﺑﺎرﻫﺎي وارده ﺑﺮ ﺑﺴﯿﺎري از ﺳﺎزهﻫﺎي ﺑﺘﻨﯽ ﻣﺴﻠﺢ و ﭘﯿﺶﺗﻨﯿﺪه، ﺑﺘﻦ را ﺗﺤﺖ ﺷﺮاﯾﻂ ﺳﻪ ﻣﺤﻮري و ﻣﺤﺒﻮس ﺷﺪه ﻗﺮار ﻣﯽدﻫﻨﺪ. ﺑﻪ ﻣﻨﻈﻮر ﺗﺤﻠﯿﻞ و ﻃﺮاﺣﯽ ﺻﺤﯿﺢ و اﺻﻮﻟﯽ ﭼﻨﯿﻦ ﺳﺎزهﻫﺎﯾﯽ، داﻧﺴﺘﻦ رﻓﺘﺎر ﺑﺘﻦ در وﺿﻌﯿﺖ ﻣﺤﺒﻮس ﺷﺪه ﺿﺮوري اﺳﺖ. ﻫﻤﭽﻨﯿﻦ ﻣﻄﺎﻟﻌﻪ ﺷﮑﻞ ﻣﻨﺤﻨﯽ ﮐﺎﻣﻞ ﺗﻨﺶ-ﮐﺮﻧﺶ ﺑﺘﻦ ﺗﺤﺖ ﺑﺎرﻫﺎي ﮐﻠﯽ و ﺳﻪ ﻣﺤﻮري ﺑﺮاي ﺗﺤﻠﯿﻞ ﻏﯿﺮ ﺧﻄﯽ و ﻃﺮاﺣﯽ ﺳﺎزهﻫﺎي ﺑﺘﻨﯽ ﻣﺴﻠﺢ و ﭘﯿﺶﺗﻨﯿﺪه اﻫﻤﯿﺖ دارﻧﺪ. در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﻪ ﻣﻨﻈﻮر درك ﺑﻬﺘﺮ رﻓﺘﺎر ﺑﺘﻦ در ﺣﺎﻟﺖ ﻣﺤﺒﻮس ﺷﺪه، از آزﻣﺎﯾﺸﺎت ﺗﮏ ﻣﺤﻮري و ﺳﻪ ﻣﺤﻮري ﺑﺮ روي ﻧﻤﻮﻧﻪﻫﺎي اﺳﺘﻮاﻧﻪاي ﺑﺘﻨﯽ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. در اداﻣﻪ، ﺑﻪ ﻣﻨﻈﻮر ﻓﺮﻣﻮﻟﻪ ﮐﺮدن ﺿﺎﺑﻄﻪاي ﺑﺮاي ﺷﮑﺴﺖ ﺑﺘﻦ ﺗﺤﺖ ﺗﻨﺶﻫﺎي ﺳﻪ ﻣﺤﻮري از ﻓﻀﺎي ﺗﻨﺶ اﮐﺘﺎﻫﺪرال اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ.

Loads on most of concrete structure & pre-stressing, make concrete under triaxial and confined condition. For principled analysing & designing of these structures, the understanding of the behavior of concrete under triaxial stress states is needed. Also study of stress-strain curves under triaxial for analysing nonlinear and designing of reinforced concrete structures & pre-stressing, is important. In this study, for better comprehension of behavior of confined concrete, uniaxial and triaxial test on cylindrical specimens, was applied. In addition, octahedral phase was used for formulation of confined concrete failure.