摘要
虎跳峡金沙江大桥主桥采用(766+160) m独塔单跨地锚式钢桁梁悬索桥。该桥仅在东岸设置桥塔,西岸直接将主缆通过复合索鞍结构后锚于岩层中。为确定复合索鞍在施工及运营阶段的受力性能,设计制作1∶4的索鞍结构缩尺模型,通过静载试验研究主缆力作用下的索鞍位移、辊轴接触应力分布规律和辊轴活动性能,并对索鞍结构进行优化设计。结果表明:索鞍的竖向和纵向位移随索力增加逐渐增加,但增长速度变缓;辊轴接触应力分布不均匀,最不利荷载下最大接触应力为789 MPa,最小接触应力为66 MPa;加载过程中,各辊轴运动基本保持一致;对索鞍结构进行优化设计后,辊轴接触应力分布变均匀,最大接触应力减小至578 MPa,最小接触应力增大至399 MPa。
The main bridge of Jinshajiang River Bridge over Tiger Leaping Valley is a steel truss girder earth-anchored suspension bridge with spans of 766 and 160 m. The bridge only has a tower on the east bank, and the main cables are threaded through the composite saddles and directly anchored to the rocks on the west bank. To examine mechanical performance of the composite saddles in the construction and operation stages, a 1∶4 scale model of the saddle structure was designed and manufactured. The static load tests were carried out to study the saddle displacement, the contact stress distribution and the behavior of rollers under the main cable force. And the prototype structure was optimized. The results show that the vertical and longitudinal displacements of the saddle gradually increase with the increase of the cable force, but the increasing rate slows down. The contact stress distribution of the roller is not uniform, and the maximum contact stress is 789 MPa and the minimum contact stress is 66 MPa under the most unfavorable load. During the loading process, the movement of each roller is basically the same. After optimizing the saddle structure, the contact stress distribution of rollers becomes uniform, and the maximum contact stress decreases to 578 MPa, and the minimum contact stress increase to 399 MPa.
作者
沈锐利
薛松领
马健
刘斌
SHEN Rui-li;XUE Song-ling;MA Jian;LIU Bin(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;Broadvision Engineering Consultants, Kunming 650041, China)
出处
《桥梁建设》
EI
CSCD
北大核心
2019年第5期15-20,共6页
Bridge Construction
基金
云南省交通运输厅科技项目（云交科教[2018]38）~~
关键词
悬索桥
复合索鞍
受力性能
辊轴
接触应力
位移
模型试验
suspension bridge
composite saddle
mechanical performance
roller
contact stress
displacement
model test
