<![CDATA[This study discusses the structural planning of steel flexural beams without lateral bracing, a critical condition in structural design due to the risk of lateral-torsional buckling. The beam used in this analysis is a WF 450x250x6x9 steel profile with a span of 18.5 meters, subjected to a dead load of 2.85 kN/m and a live load of 3.45 kN/m. The material selected is BJ40-grade structural steel. The analysis incorporates nominal flexural strength, stiffness, and the effect of unbraced length in the lateral direction. The design process adheres to the Indonesian standard SNI 1729:2020, which regulates specifications for structural steel buildings. The combined loads are first converted into factored loads using ultimate load combinations. The maximum moment on the span is then calculated. Determining the nominal flexural capacity takes into account the stability effects due to the unbraced length, which reduces the nominal plastic capacity of the beam. The final results show that the WF 450x250x6x9 beam can resist a design moment of 1704.11 kNm, with a nominal flexural strength (Mn) of 1722.92 kNm, indicating the beam is safe under the given loading]]>
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