A　total　of　6　concrete-filled　new　S35657　austenitic　stainless　steel　tubular（CFSST）beams　were　prepared　for　pure　bending　test，to　evaluate　the　influence　of　concrete　type　and　cross-sectional　shape　on　the　failure　mode，load-deformation　relationship，flexural　stiffness　and　resistance　of　CFSST　specimens.　The　test　results　show　that　concrete　made　with　waste　materials　has　minor　influence　on　the　failure　modes，but　it　has　positive　effect　in　improving　the　flexural　stiffness　and　strength　of　new　CFSST　beams.　A　finite　element　（FE）　model　was　then　established　to　verify　the　feasibility　and　accuracy　of　current　concrete　and　stainless　steel　models　for　further　FE　analysis.　At　last，the　feasibility　and　accuracy　of　current　design　guidelines　for　predicting　the　flexural　capacity　were　also　analyzed.　©　2024　Tongji　University.　All　rights　reserved.