波形钢腹板组合板梁桥负弯矩区抗弯性能研究

Research on bending performance of composite girder bridge with corrugated steel webs in negative moment zone

针对波形钢腹板组合板梁桥,为研究负弯矩区关键设计参数和极限抗弯承载能力计算方法,以某三跨波形钢腹板组合板梁桥为背景,采用ABAQUS软件建立有限元模型,探讨波形钢腹板组合板梁桥负弯矩区的受力性能,基于参数敏感性分析明确了负弯矩区钢梁设计参数的合理取值范围,揭示了波形钢腹板组合板梁桥负弯矩区抗弯特性,提出适用于波形钢腹板组合板梁桥的负弯矩区抗弯计算方法。结果表明:支点波形钢腹板厚度由抗剪及屈曲强度控制,负弯矩区受压下翼缘板宽厚比不宜大于28,波形钢腹板抗弯贡献仅约5.7%,实际工程中负弯矩区抗弯承载力计算可忽略波形钢腹板影响。

In order to clarify the key design parameters of the negative bending moment zone and the ultimate bending calculation method of the composite girder bridge with corrugated steel webs,a three⁃span composite girder bridge with corrugated steel webs was used as the background,the finite element model was established by ABAQUS software,and the mechanical performance of the composite girder bridge with corrugated steel webs in the negative bending moment zone was studied.Through parameter sensitivity analysis,the reasonable range of design parameters of steel beams in the negative bending moment zone was clarified,and the bending mechanism of composite girder bridge with corrugated steel webs in the negative bending moment zone was revealed.A calculation method for bending resistance in the negative bending moment zone was proposed for composite girder bridges with corrugated steel webs.The results show that the thickness of the fulcrum corrugated steel web is controlled by the shear resistance and buckling strength.The width⁃to⁃thickness ratio of the flange plate under compression in the negative moment zone should not be greater than 28.The flexural contribution of the corrugated steel web is about 5.7%,and the flexural contribution of the corrugated steel web can be ignored in the calculation of the flexural bearing capacity of the negative bending moment zone in the actual project.