宽箱梁自锚式悬索桥主缆锚固区受力分析

Mechanical Analysis of Main Cable Anchorage Zone of Self-Anchored Suspension Bridge with Wide Box Girder

自锚式悬索桥通过主缆与加劲梁锚固结合的方式,形成闭合传力路径。主缆的水平分力通过锚固区,逐渐传递到主跨加劲梁;竖向分力则主要通过边跨自重平衡。现以太原市通达街跨汾河的四跨单塔自锚式悬索桥为背景工程,针对其锚固区梁段宽度大、锚固构造复杂等特点,建立主缆锚固区的板壳实体有限元模型,并计算分析了主缆力作用下,宽箱梁段支座间的荷载分配关系、锚固区局部受力情况、主缆力在锚固区的传递机理等,为今后同类型结构的设计提供依据。

Self-anchored suspension bridges form a closed force path by anchoring the main cable and stiffening girder.Horizontal force of the cable is gradually transferred to main-span girder through anchoring area while the vertical component force is balanced by self-weight of side-span girder.Based on the four-span single pylon self-anchored suspension bridge at Tongda street in Taiyuan,which adopts wide box girder and complex anchorage zone.In the meantime,a finite element model of the anchorage structure was established.The load distribution relationship between the supports of the wide box girder section,the local stress in the anchoring area,and the transmission mechanism of the main cable force in the anchoring area are calculated and analyzed,which provides the basis for the design of the same type structure in the future.