关键词: 桥梁工程；波形钢腹板；弯扭耦合承载力；相互作用关系；数值分析；计算方法

Abstract: According to the structural characteristics of the corrugated steel web (CSW), a calculation method of flexural-torsional coupling capacity of composite box girder with CSW was established, which took into account the interaction relationship between bending moment and torque. In order to verify the accuracy and applicability of the proposed calculation method of flexural-torsional coupling, the parameterized analysis was conducted using experimentally validated numerical analysis methods and compared with the calculation results. The results indicate that the torque-twist curve and bending moment-displacement curve obtained by the numerical analysis method are in good agreement with the test results. Under the flexural-torsional coupling action, there is a mutual weakening effect between the ultimate bending moment and torque of the composite box girder with CSW. The results of flexural-torsional coupling capacity of composite box girders with CSW obtained through existing specifications deviate significantly from the parameterized analysis results and are considered to be unsafe. The proposed calculation method of flexural-torsional coupling capacity takes into account the interaction between flexural-torsional coupling and can accurately predict the bearing capacity of composite box girder with CSW under the action of flexural-torsional coupling.

Key words: bridge engineering; corrugated steel web; flexural-torsional coupling capacity; interaction relationship; numerical analysis; calculation method