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2021. Experimental Investigation of the Effect of Filled Steel Tubular with Various Sand Grains Diameters on the Buckling Behavior. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 43, 2 (Oct. 2021), 324–347. DOI:https://doi.org/10.55562/jrucs.v43i2.156.