腹板变波高布置对波形钢腹板箱梁的抗扭性能影响研究

Research on the Effect of Variable Wave Height Arrangement of Webs on Torsion Resistance of Box-Girders with Corrugated Steel Webs

目前很少见到波形钢腹板变高度布置对波形钢腹板箱梁抗扭性能影响的研究成果。采用Midas FEA建立三维有限元模型,进行波形钢腹板变波高布置对波形钢腹板箱梁抗扭性能的影响研究,并结合伊朗某高速公路上的BR-06L/R特大桥对研究成果进一步验证。研究结果表明:保证波形钢腹板箱梁恒载不变的情况下,仅仅在小范围内增大波形钢腹板的波高同时降低厚度,可以很大程度的提升波形钢腹板箱梁的抗扭性能;针对目前波形钢腹板箱梁桥均设计为波形钢腹板等波高布置的现状,提出了波形钢腹板变波高布置的设想,通过实桥数值分析,将抗扭能力较弱的截面在小范围内增大波形钢腹板的波高同时降低厚度,可以使该截面的抗扭能力有显著提升。

At present,the research results of the effect of the variable wave height arrangement of corrugated steel webs on the torsional behavior of corrugated steel webs are rarely seen.A 3-D finite element model was established by Midas FEA to study the effect of variable wave height arrangement of corrugated steel webs on the torsional behavior of box girder with corrugated steel webs.Combined with the BR-06L/R bridge on a certain expressway in Iran,the research results were further studied.The research results show that in the case that the dead load of the corrugated steel web box girder is constant,the wave height of the corrugated steel web is increased and the thickness is reduced only in a small range,and the torsional performance of the corrugated steel web box girder can be greatly improved.Aiming at the current situation that the corrugated steel box girder bridges are designed with the same wave height arrangement of corrugated steel webs,the idea of wave height variation arrangement is proposed.Through a real bridge numerical analysis,the cross-section with weaker torsional resistance increases the wave height of corrugated steel web and reduces the thickness of corrugated steel web in a small range,which can significantly improve the torsional resistance of the section.