LAUSR

Abstract Composite beams and girders with corrugated steel webs have been achieving promising application in structure and bridge engineering around the world. Nevertheless, there still exists few research related with the behavior of box-girders with corrugated steel webs under pure torsion. To gain a deep insight of such subjects, two steel-concrete composite box girders with trapezoidally corrugated webs and steel bottom flange plate were designed and experimentally investigated. The experimental results including the failure mode, mechanical characteristics, bearing capacity, deformability, strain and stress evolution of each component were thoroughly analyzed. The prediction formulas for stiffness, crack torque and ultimate torque were then thoroughly developed. Moreover, a series of finite element models were established and verified by using experimental results. A parametric study was then conducted and compared with the corresponding prediction results. The good agreements between them confirm the validity of prediction formulas.