<![CDATA[e application of cold formed steel material as a structural element of buildings has begun tobe considered because the material is strong and light. The capacity of single-section cold formed steelcan be increased by combining the sections. There is less research on cold formed steel beams thancolumns. Research on the failure pattern of cold formed steel with variations in length has not been donebefore. This study aims to obtain the value of flexural capacity, deflection at maximum load, and collapsepattern of cold formed steel beams. The research was conducted experimentally on a simple supportedface to face cold formed steel beam (roll-joint) by applying a four-point bending load to obtain failure dueto pure bending. The results of this study indicate, the longer the face to face cold formed steel beam, thesmaller the value of the load capacity that can be held and the greater the deflection value that occurswhen the maximum transverse load is the Double cold formed steel beam arranged face to faceexperiencing instability from the beginning of loading so that the pattern failure that occurs in the form oflateral torsional buckling. Beam instability increases with increasing beam span length. A cold formedsteel beam with a span length of 700 mm has a load capacity of 6.4 kN and a deflection of 14.5 mm. Thefailure pattern that occurs is in the form of lateral torsional buckling with a torque value of 0.74° and alateral deflection of 0.12 mm. Cold formed steel beams with a span length of 1300 mm are capable ofwithstanding a maximum load of 4, 8 kN and deflection at maximum load of 32.37 mm. The beamexperienced a failure pattern in the form of lateral torsional buckling with a rotation of 1.57° and a lateraldeflection of 0.74 mm. The cold formed steel beam with a length of 3900 mm has a rated load capacity of1.7 kN and a deflection of 91.49 mm. The failure pattern that occurs when the maximum load is in theform of torsional buckling of 4.02° and lateral deflection of 2.41 mm. The load capacity of the coldformed steel beam with a span length of 4300 mm is 1.4 kN and the deflection at maximum load is 99.43mm. The beam experienced a lateral torsional buckling failure pattern with a turning angle of 12.56° anda lateral deflection of 4.84 mm. The cold formed steel beam with a length of 3900 mm has a rated loadcapacity of 1.7 kN and a deflection of 91.49 mm. The failure pattern that occurs when the maximum loadis in the form of torsional buckling of 4.02° and lateral deflection of 2.41 mm. The load capacity of thecold formed steel beam with a span length of 4300 mm is 1.4 kN and the deflection at maximum load is99.43 mm. The beam experienced a lateral torsional buckling failure pattern with a turning angle of12.56° and a lateral deflection of 4.84 mm. The cold formed steel beam with a length of 3900 mm has arated load capacity of 1.7 kN and a deflection of 91.49 mm. The failure pattern that occurs when themaximum load is in the form of torsional buckling of 4.02° and lateral deflection of 2.41 mm. The loadcapacity of the cold formed steel beam with a span length of 4300 mm is 1.4 kN and the deflection atmaximum load is 99.43 mm. The beam experienced a lateral torsional buckling failure pattern with aturning angle of 12.56° and a lateral deflection of 4.84 mm]]>
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