【摘要】 按能量比重将曲线箱梁桥的振型分解为竖向弯曲、扭转、横向弯曲和纵向移动等4个振型方向因子。以圆心角为参数建立了4个曲率半径为60m,圆心角分别取值为30°、45°、60°和90°的两跨曲线箱梁桥模型,分析了其模态特性及各振型方向因子随圆心角的变化规律。认为随着圆心角的增大,曲线桥刚度的增加比质量的增加要快,必须充分考虑竖向弯曲振型,应该考虑扭转振型的影响,应该考虑第4阶~第19阶之间的横向弯曲振型的影响。对于纵向移动振型方向因子,要考虑第11阶~第13阶模态的影响。在抗震设计时必须充分考虑足够多的高阶模态的影响。更多还原

【Abstract】 The vibration mode of curved box-girder bridge is decomposed into 4mode direction factors as per energy ratios.Taking curvature radius as parameter,4two-span curved box-girder bridge models with 60 m curvature radius and 30°,45°,60°and 90°central angle respectively are built.The modal characteristics and the mode direction factors are analyzed alone with curvature radius varying.It is advised that the rigidity increases faster than mass for curved box-girder bridge,vertical bending mode must be taken account,torsional mode,transverse bending mode between order 4to order 9,and the longitudinal movement mode between order 11 to order 13 should be considered.High order modals must be considered when making design.更多还原