In　this　study,　an　experimental　investigation　was　conducted　on　the　axial　compression　performance　of　ribbed　Hsection　aluminum　alloy　members　with　initial　curvature　and　torsion　angle　under　varying　boundary　conditions,　including　one　end　hinged　with　the　other　rigidly　connected,　and　both　ends　rigidly　connected.　Ultimate　bearing　capacity　and　failure　modes　were　identified　under　real　loads　and　subsequently　compared　with　previous　findings　from　our　research　group　on　members　with　hinged　ends.　To　account　for　initial　imperfections　introduced　during　processing　and　transportation,　3D　scanning　technology　was　utilized　to　capture　the　precise　geometrical　dimensions,　constructing　an　accurate　numerical　simulation　model.　The　experimental　results　were　corroborated　with　numerical　simulations,　leading　to　the　proposal　of　an　analytical　method　for　members　with　initial　curvature　and　torsion　angle.　Furthermore,　extensive　parametric　analysis　elucidated　the　impact　of　initial　curvature,　torsion　angle,　and　slenderness　ratio　on　the　ultimate　bearing　capacity,　culminating　in　the　formulation　of　the　stability　factor　and　calculated　length　factor　based　on　numerical　outcomes.　The　study　discovered　significant　variances　in　bearing　capacity　under　different　boundary　conditions,　with　one-end　hinged　and　one-section　rigidly　connected,　and　two-end　rigidly　connected　conditions　exhibiting　1.4　and　2.1　times　the　capacity　of　the　hinged-at-both-ends　scenario.　Under　different　boundary　conditions,　the　axial　compression　members　were　subjected　to　flexural-　torsional　buckling　failure.　Moreover,　when　the　ultimate　bearing　capacity　was　reached,　the　lower　flange　of　the　member　and　the　web　near　the　lower　flange　appeared　obvious　buckling　phenomenon.　The　numerical　analysis　aligned　well　with　experimental　data,　validating　the　simulation　method＇s　reliability　and　revealing　the　stress　distribution　and　evolution　during　member　failure.　These　findings　offer　vital　theoretical　insights　and　technical　support　for　engineering　design　and　practical　applications.