摘要
斜拉桥中采用塔上鞍座锚固的钢绞线拉索在金属管道内受到摩阻效应的影响而具有抗滑锚固性能,该文分析了摩擦型及机械型锚固构造的传力机理,讨论了永久作用及可变作用对拉索抗滑性能的影响,建立了计算模型并编制了程序,以此为工具对南昌朝阳大桥的塔上锚固装置进行了计算。经过研究得出结论:鞍座区钢绞线拉索在不平衡力作用下的摩擦角比值可作为抗滑措施选用的依据,机械型抗滑装置可利用鞍座区的反向摩阻效应锚固拉索,鞍座区钢绞线拉索在可变作用下的响应由于受摩阻效应影响会发生累积。
Strand stayed cables on towers of cable-stayed bridges with saddle deviators exhibit anti-slipping properties due to frictional effects in saddle pipes. This study investigated load transferring mechanisms of frictional and mechanical anchor structures. The influence of permanent and variable actions on the performance of anti-slipping devices of stayed cables was discussed. Calculation models and computational codes were developed, and the Nanchang Chaoyang Bridge was chosen to as a case example to validate the models. Conclusions were： 1） the ratio of friction angles of super tension side and anti-slipping side of strand stayed cables in saddle deviators subjected to unbalanced actions is a critical factor when determining anti-slipping measures; 2） mechanical anti-slipping devices can anchor strand stayed cables from the reverse friction in saddle deviators; 3） the response of strand stayed cables in saddle deviators accumulates due to the frictional effect when subjected to variable actions.
作者
胡方健
HU Fang-jian(Shanghai Urban Construction Design and Research Institute, Shanghai 200125, China)
出处
《工程力学》
EI
CSCD
北大核心
2016年第11期140-147,共8页
Engineering Mechanics
关键词
桥梁工程
斜拉桥
钢绞线斜拉索
鞍座
摩阻力
抗滑装置
bridge engineering
cable stayed bridge
strand stayed cables
saddle deviator
friction resistance
anti-slipping device
