Torsional calculation method of spatial cable with consideration of tension-torsion coupling effect(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2015年06期
- Page:
- 91-97
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Torsional calculation method of spatial cable with consideration of tension-torsion coupling effect
- Author(s):
- QI Dong-chun; SHEN Rui-li; LIU Zhang-jun; TAN Yun-zhi
- 1. School of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, Hubei, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
- Keywords:
- bridge engineering' target='_blank'>’serif’">bridge engineering; suspension bridge; spatial cable; torsional stiffness; tension torsion coupling; torsion control
- PACS:
- U448.25
- DOI:
- -
- Abstract:
- Because torsional stiffness of main cable which contains a plurality of steel wire is affected by many factors, there is no reliable calculation method for spatial cable torsion at present. The chief factors influencing torsional stiffness were analysed in this paper. The analytical calculation model with consideration of tension-torsion coupling effect was established, and the formula of resistance torsion moment of main cable caused by tension torsion coupling was deduced. On this basis, the influence law of main cable radius, tension and torsion angle on torsional stiffness was discussed. The impact of torsional stiffness, cable clamp rigid arm, suspender tensioning sequence and cable clamp preformed angle on main cable torsion angle was analyzed from the perspective of construction control. The results show that the torsional stiffness of main cable presents nonlinear growth trend during the system transition with the increase of tension and torsion angel because of the influence of tension-torsion coupling effect. In the construction control, in order to reduce torsion deformation of main cable, the bias angle of cable clamps can be set towards the rotation direction of cable clamp at the stage of finished bridge at the time of assembly. 〖JP2〗The active control of the main cable torsion can be realized through a reverse torque to the main cable, that is generated by applying the hanger force to the rigid arm of cable clamp. This method can offset or reduce torsional deformation of the main cable.
Last Update: 2015-11-23