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Abstract III BSIRACT In steel tructures, alarge unmoor of structural elements are berun-cohunns, i.e, they Me subjected to axial force and bending moment, A cohunn may undergo flexural buckling. torsional buckling, torsional-flexural buckling, 01’ lccal btl kling according to the boundary conditions and geometrical properties of die cross-section. On IJ1e other hand, a beam element may undergo lareral-torsional buckling. IOCRl buckling. or distorsional buckling depending 00 its boundary conditions and the geometrical propertiesof the cro -section. Thi re ”arch ainlS to rudy Ih” imel’nction between iodividu I b\l<~kfu<T mod” of COIUlllIl and those of beam whenthe member is ubjected 10 axial force and bending moment simnltaueou Iy. Strut purlin is all ide<11example of such members undergoing intemctive bllcklin!!. Therefore, the II1It purlins will be iuvestigatedas an example of tho e structural element ia rhi study, Buckling of strut purlins will be tudied b}’ finite element method. Individual buckling III de will be monitored for purlin und r axial load. flexural lIplin. and axial load as well as flexural uplift, Factors affecting rnemberslrengtli will 00 studied. onrributiou of deck or sheeting in restraining SIT\I[ purlins against different buckling modes is COil ide-red ill finite elerueut mode-Is. Effect of tie rods on member xial lind flexural strength is Also investigated. Results of mute eleuiem analysis will be compared to available design methods of the different codes of practice such as AI I. alUl Eurocodes. In this research finite element eigen value analysis and non-lineal’ elastoplastic analysis win be urilized 10 investigate the buckling behavior of cohnuns, be!1]J’IS, ami beam-column elements. Theeigeu value analysis will be employed to esrimate the rilie. I buckling loads. while rhe non-linear elasto-pla lie ;Ult1t is will be \1 ed 10 estanate the 111tinate resistance of these elements, Result of fillite elemeut analysis will be verified and compared with the results of the design codes, AmI by experimental results available in literatures. |