Nine steel-concrete composite box girders,four under pure torsion and five under combined bending and torsion were tested to study their torsional behaviors.

• 在试验分析的基础上,采用钢筋混凝土变角软化桁架模型,建立了适于分析钢-混凝土组合箱梁复合弯扭强度的三维桁架模型。