拉索断裂对空间扭转索面斜拉桥主梁线形的影响研究

摘要

T aking the spatial torsion cable planes cable-stayed bridge of T ianjin as the engineering background,the simulation model was established by using the finite element software Midas/Civil to research on influence of single cable and double cables breaking on linear of main girder. Analysis results show that influence of cable breakage is different between spatial torsion cable planes cable-stayed bridge and cable planes cable-stayed bridge. T he middle cable breakage has more influence of cable-stayed bridge structure performance in spatial torsion cable planes cable-stayed bridge. T he linear change of peak appeared at the vicinity of anchorage point,the displacement along the bridge longitudinal decreasing in both sides. Different cable breakage has different influence on linear and influence of double cable breakage is greater than single. Suggest that consider the way of transverse or origin symmetric in replacing cable.%以天津一空间扭转索面斜拉桥为工程背景，利用有限元软件 Midas/Civil建立仿真模型，研究斜拉索单索、双索断裂对主梁线形的影响规律。研究结果表明，空间扭转索面斜拉桥与平面索面斜拉桥受拉索断裂的影响规律不同：在空间扭转索面斜拉桥中，桥跨中间部位拉索断裂对斜拉桥结构性能的影响较大；主梁线形变化峰值出现在断索锚固点附近，沿桥梁纵向向两侧递减；不同斜拉索断裂对主梁线形影响不同，双索断裂产生的影响比单索断裂大。斜拉桥若进行换索，建议考虑采用横向对称或原点对称方式换索。