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空间缆索自锚式悬索桥的主缆直接锚固在加劲梁上,同时由于主缆的空间特性,与地锚式悬索桥及传统平面索相比,其动力性能存在很大的差异。针对青岛海湾大桥大沽河航道桥建立非线性空间有限元模型,对其动力特性及结构刚度影响规律进行了分析。结果表明,该桥振型基本合理,具有密布的频谱;作为自锚式悬索桥其整体刚度较低,固有周期较长;单柱式桥塔的横向刚度较弱,横向振动出现较早;另外,由于缆索横向间距较小,刚度较小,前10阶振型中有5阶索振。各振型受结构刚度的影响不同,主缆刚度主要影响悬索桥的1阶竖弯及扭转,加劲梁竖向刚度对加劲梁1阶竖弯及加劲梁扭转振型影响较大,横向刚度主要影响悬索桥的加劲梁横向振型,扭转刚度主要影响悬索桥的1阶扭转振型;主塔纵向刚度主要影响悬索桥的纵飘振型;横向刚度主要影响索塔的1阶横向振型。
The main cable of the space cable self-anchored suspension bridge is directly anchored to the stiffening girder. Due to the spatial characteristics of the main cable, the dynamic performance of the space cable is quite different from that of the ground anchorage suspension bridge and the traditional plane cable. A nonlinear finite element model is established for the Daguhe Channel Bridge of Qingdao Bay Bridge, and its influence on dynamic characteristics and structural rigidity is analyzed. The results show that the vibration mode of the bridge is basically reasonable and has a dense frequency spectrum. As the self-anchored suspension bridge, the overall stiffness is low and the natural period is long. The transverse rigidity of the single-column bridge is weak and the lateral vibration appears earlier. Due to the small horizontal spacing of the cables and low stiffness, there are 5-order cable vibrations in the first 10 modes. The vibration modes of the girder bridge mainly affect the first-order vertical bending and torsion of the suspension bridge. The vertical stiffness of the girder has a significant influence on the first-order vertical bending of the girder and the torsional vibration mode of the stiffening girder. The lateral stiffness mainly affects The torsional stiffness of the suspension bridge mainly affects the first order torsional vibration mode of the suspension bridge. The longitudinal stiffness of the main tower mainly affects the longitudinal drift mode of the suspension bridge. The transverse stiffness mainly affects the first order transverse vibration mode of the tower.