Investigation the behavior of LWAC encased steel columns
\nafter exposure to elevated temperature
\nNoor Al-Huda Al-Talqani1 | Haitham Al-Thairy1,2
\n1Civil Engineering Department, College of
\nEngineering, University of Al-Qadisiyah,
\nAl Diwaniyah, Iraq
\n2College of Engineering, University of
\nWarith Al-Anbiyaa, Karbala, Iraq
\nCorrespondence
\nHaitham Al-Thairy, Civil Engineering
\nDepartment, College of Engineering,
\nUniversity of Al-Qadisiyah, Al Diwaniyah,
\nIraq.
\nEmail: haitham.althairy@qu.edu.iq
\nAbstract
\nThis paper presents experimental and numerical investigations on the behavior
\nof eccentrically loaded lightweight aggregate concrete encased steel (LWACES)
\ncolumns after exposing to elevated temperatures. Sixteen concrete encased steel
\n(CES) columns were considered in the study, 12 of which were exposed to elevated
\ntemperature then eccentrically loaded up to failure at different eccentricity
\nratios. The effect of temperature on the load\u2013displacement relationships, failure
\nload, and failure modes of the concrete encased steel (CES) columns was monitored
\nand evaluated. Experimental results have shown that as the temperature
\nincreases, the load bearing capacity of the CES columns decreased. It has also
\nbeen showed that, at high temperature, the normal-weight concrete encased
\nsteel (NWCES) columns experienced larger degradation of the load bearing
\ncapacity compared to that of LWACES columns. Also, this study presents a
\nnumerical simulation of the behavior of LWACES columns at elevated temperatures
\nwith eccentric compressive load. The numerical model was implemented
\nin conducting parametric study to understand the effect of temperature distribution,
\nconcrete cover, eccentricity ratio, and high temperature levels on the
\nbehavior of the thermally exposed (CES) columns. Numerical results have
\nrevealed that, at temperature value of 500C, the ultimate capacity of LWACES
\nwith eccentricity ratios of 0.75, and 1 has decreased by 17%, and 23%, respectively,
\ncompared to that of the column with eccentricity ratio of 0.5.<\/p>\n
<\/p>\n