摘要
主缆索股的无应力下料长度是自锚式悬索桥施工控制阶段的关键参数之一。为获得平弯锚固自锚式悬索桥主缆索股精确的下料长度,首先通过有限元模型分析得出主缆中心线的初始无应力长度,再根据结构的细部构造和索股的空间位置分别进行主索鞍竖转、散索鞍平转和锚固段散索三项修正,并通过分析给出了各项修正值的计算公式,最终的主缆索股无应力下料长度即为初始无应力长度与三项修正值之和。实桥空缆架设后的观测数据显示,实测高程与设计高程之间的偏差在相关规范规定的允许范围内,表明对主缆索股无应力下料长度的精确计算取得了良好的成效。
The zero-stress cutting length of the main cable is a key factor for self-anchored suspension bridge in construction control stage.In order to obtain accurate cutting length of the main cable of a self-anchored suspension bridge with plane-bending anchorage system.First,the initial zero-stress length of the central strand of the main cable was calculated through finite element model analysis.Based on the detailed structure and the spatial position of the strands,length corrections on the main saddle,the plane-bending splay saddle and the anchorage system were also analyzed,and corresponding correction formulas were derived respectively.Therefore,the zero-stress cutting lengths of the cable strands were the sum of the initial length and the three correction values.According to the observation data of the empty cable shape of a real bridge,the deviations between the measured elevations and the designed elevations were less than the relevant code values,which indicated that good results were achieved through the accurate calculation method of the main cable zero-stress cutting length.
作者
黄朝光
HUANG Chaoguang(Fruzhou Coumunications Construction Group Co.,Ltd.,Fruzhou,Fryjian 350028,China)
出处
《水利与建筑工程学报》
2020年第4期155-159,170,共6页
Journal of Water Resources and Architectural Engineering
关键词
自锚式悬索桥
无应力下料长度
主缆索股
平弯锚固
self-anchored suspension bridge
zero-stress cutting length
main cable strands
plane-bending anchorage
