悬索桥的锚碇.pdf

28 2 Vol128 No12 2011 2 Journal of H ighw ay and Transportation Research and Developm ent eb. 2011 : 1002- 0268 ( 2011) 02- 0082- 06 - 齐东春, 沈锐利, 唐茂林 ( , 610031) : 为在悬索桥结构分析中精确计算锚跨索股的张力, 建立了包括锚碇散索鞍及锚跨索股在内的 3节 组合单 元, 该单元精确考虑了锚跨内各索股的空间走向, 满足索股与鞍座相切及节 间索股无应力长度不变两 个重要条件, 并能考虑锚碇的沉降对锚跨索股索力的影响假定成桥状态锚跨索股张力的合理分布模式后, 根据散索鞍的自立平 衡条件及锚跨索股与散索鞍的几何关系, 迭代出索股与鞍座的切 坐标及切 索力, 根据悬链线索的刚度矩阵定义 并利用静力平衡条件推导出单元切线刚度矩阵结果表明: 将该单元用于悬索桥结构有限元计算中, 能准确计算出 锚跨索股的索力分布, 提高锚跨索股施工控制的精度 : 桥梁工程; 锚碇- 锚跨单元; 有限元法; 锚跨索股; 散索鞍 : U448125 : A Study and Application of Anchorage-Anchor Span E lem ent for Suspension Bridges QI Dongchun, SHEN Ruil,i TANG M aolin ( School of CivilEngineering, Southwest Jiaotong Un iversity, Chengdu Sichuan 610031, Ch ina) Abstract: In order to accurately calculate the tension of anchor span strands in structural analysis of suspension bridges, a three-node combination element, including anchorage, splay saddle and anchor span strands, was established. The elem ent can precisely dealw ith the spatial location of each cable strand in the anchor span, contains two mi portant conditions: the cable strands are awl ays tangential to the saddle, and the unstressed length of the strands between node pairs remains constant, and also can take into account the effect of anchorage subsidence on the tension of anchor span strands. On the assumption that the distribution of tension of anchor span strands in completed stage is feasible, according to the equilibrium condition of splay saddle and the geometric relation between anchor span strands and splay saddle, the tangent point coordinate and tension were calculated by iteration, and th