自锚式悬索桥钢主梁主缆锚固结构力学性能分析与优化  

Mechanical Analysis and Design Optimization for Anchorage Zone Connecting Main Cable and Main Girder of Self-Anchored Suspension Bridges

作　　者：苏庆田[1] 周家兴[1] 吴冲[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2012年第1期1-7,共7页Structural Engineers

基　　金：国家自然科学基金资助项目(50708075)

摘　　要：自锚式悬索桥主缆直接锚固在主梁上,主缆的巨大拉力通过锚固区传递到主梁上,锚固区结构构造复杂,受力机理难以用常规的杆系模型进行分析,必须依靠板壳或实体模型进行。锚固区结构的受力受边界条件的影响较大,采用板壳和实体单元详细模拟了某自锚式悬索桥锚固区结构,讨论了合理的计算模型必须采用的主梁长度。计算了原设计方案中锚固结构的受力状况,并提出了优化方案;计算分析表明优化方案能使得锚固区结构传力顺畅并降低主要结构构件应力,可为同类桥梁参考使用。Self-anchored suspension bridge is anchored at each end of main girder, thus producing a self-balancing system. With complicated configuration and important rule of transferring tension in main cable to main girder, the anchorage region is one of the most critical issues during designing a self-anchored suspension bridge. It is impossible to fully understand the mechanical behavior only by spatial beam and column model but spatial refined model. Because the behavior of anchorage region is greatly influenced by its boundary condition in calculation, in this paper, reasonable length of main girder in calculation model is discussed based on the spatial refined model. On the other hand, the mechanical behavior of initial anchorage structure is calculated and an optimization anchorage fabrication is proposed. Calculation results show that the optimized anchorage system makes a more efficient structure and decreases the stress of anchorage structure effectively, and can be referenced to other similar bridges.

关 键 词：悬索桥 自锚式 锚固区 钢主梁 有限元法 结构优化 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]