波形钢腹板连续梁中横梁受力分析

Analysis on Middle Cross Beam Stress of Corrugated Steel Web Continuous Beam

波形钢腹板连续梁中横梁剪力传递路径复杂,同时承受多个方向荷载作用,呈现复杂的三维受力模式,需要深入研究。将结合裕溪河大桥工程,以波形钢腹板四跨连续梁为研究对象,采用MIDAS FEA通用有限元分析软件建立三维有限元模型,对中横梁受力状态进行研究,重点研究了横梁横向和竖向的拉应力问题,探究其产生的原因。分析结果表明,人孔的局部削弱不是导致拉应力的主要原因,而腹板对横梁的下压和支座的支撑作用是导致横梁顶板和人孔附近区域出现横桥向的拉应力的根本原因;截面腹板及底板区域传递大部分剪力,横梁承受竖向的拉力,会导致竖向拉应力的产生。通过设置横向及竖向预应力,可以减少横梁的横向和竖向拉应力。

The shear transfer path of the middle cross beam of corrugated steel web continuous beam is complex The beam also bears multi- directional load actions.The complex 3D stress mode is presented.It is required to further study.Combined with Yuxi River Bridge Project,and the study object of a corrugated steel web four- span continuous beam,the 3D finite element model is established by Midas FEA common finite element analysis software to study the stress state of middle cross beam,and especially study the crosswise and vertical tensile stresses of cross beam,and the causes.The study result shows that the local weakening of manway is not the main cause to lead the tensile stress,and the underdraught of web on cross beam and the supporting role of support are the primary causes to lead the tensile stress cross the bridge near the cross beam top plate and manway.The most shears are transferred at the area of sectional web and baseplate The cross beam bears the vertical tension,which will lead the cause of vertical tensile stress.The arrangement of crossing and vertical pre- stressing can decrease the crossi ng and vertical tensile stresses of cross beam